Ruby Jobs

Gusto's Expansion Experiences team owns the path from a customer's need to the product they adopt. This senior staff role shapes the technical approach for recommendations and conversion, runs experiments and mentors engineers. Ruby on Rails, React, GraphQL and TypeScript are the stack.

On Expansion Experiences you build recommendations, nurture campaigns, booking flows and plan upgrade features for Gusto customers. You design the backend APIs and data models behind them and test changes with A/B experiments. The stack is Ruby on Rails, React, GraphQL and TypeScript.

This role designs the API contracts and agent-facing tools that AI models and partners use to reach Gusto. You work directly in its Ruby on Rails codebase, set reliability practices and mentor engineers. The posting asks for a Ruby and Rails expert.

You build the ledger, subledger and reconciliation systems that record every payment at Gusto, and own the payment profile behind employer and employee payouts. The team works in one of the largest Rails and React applications in the world. Rails experience is a bonus.

Core Products covers Payroll, Benefits, HR, Retirement, Gusto Money, Solo and Pro. This staff role owns features from spec to launch and mentors engineers on large-scale problems. The work scales one of the largest Ruby on Rails and React applications in the world.

Gustie Assist is the AI agent platform behind Gusto support. You build the agent runtime, tool layer, backend and frontend, with human approval and an auditable permissions model, plus evaluation and monitoring. The backend is Rails and GraphQL.

You own and extend Gusto's integrations with accounting and partner platforms. The backend services are Ruby on Rails and Sidekiq, and the team is adding AI agent protocols such as MCP. Rails experience is strongly preferred.

You build the billing platform behind Gusto: usage jobs, subscriptions, invoices, payments and accounting integrations, including multi-entity and multi-currency billing. The work scales one of the largest Ruby on Rails and React applications in the world. Rails experience or interest is expected.

Chime's Infrastructure team runs the AWS, networking, Kubernetes, Terraform and observability systems the company runs on, and builds the self-service tools the rest of engineering uses. Those tools are written in Ruby on Rails and Go, and the posting asks for strong experience in both. Chime is an Emerald sponsor of the SF Ruby Conference.

Chime's Infrastructure Platform team owns how engineers work with Terraform, ArgoCD, AWS and the Kubernetes Helm charts behind continuous deployment. You build the self-service tooling, written in Ruby on Rails and Go, and the posting asks for strong experience in both. Chime is an Emerald sponsor of the SF Ruby Conference.

Chime is hiring a tech lead manager for Human Agent Tooling in Trust & Safety: the agent workspace, case management and member context its support agents work in. You lead a squad of 3 to 5 engineers and still ship production code, and the posting asks for proven experience with Ruby on Rails or a comparable framework. Chime is an Emerald sponsor of the SF Ruby Conference.

Chime's Cards org is hiring a backend engineer to help scale its Cards portfolio. You design low-latency APIs and services for the Trust and Safety platforms, improve reliability, and mentor other engineers. The posting asks for Ruby on Rails or a comparable framework. Chime is an Emerald sponsor of the SF Ruby Conference.

Chime's Growth team is hiring a senior full-stack engineer to own consumer features end to end, from member-facing interfaces to Rails services and APIs, and the A/B experiments that measure their impact. The front end is React and TypeScript, with APIs behind a React Native app. Chime is an Emerald sponsor of the SF Ruby Conference.

Chime's Lending org builds credit, liquidity, and money-movement products and the backend platforms behind them. This senior engineer leads cross-team backend architecture and delivery with Product, Risk, and Finance, and shapes engineering practices. The posting prefers Ruby on Rails or a comparable framework. Chime is an Emerald sponsor of the SF Ruby Conference.

Chime's Trust & Safety team is modernizing its risk platform, and this senior engineer sets technical direction, builds low-latency APIs and backend services, and mentors others. The posting requires Ruby on Rails or a comparable framework and includes an on-call rotation. Chime is an Emerald sponsor of the SF Ruby Conference.

Order.co is a B2B purchasing and payments platform that manages about half a billion dollars in annual customer spend, founded in 2016 in New York with $75M raised. This role sits on the Platform team and owns reliability for the systems the product runs on: SLOs and error budgets, incident response and root-cause analysis, Kubernetes and AWS, Terraform, CI/CD, and Datadog or OpenTelemetry for observability. The services you keep up are Ruby and Ruby on Rails; the automation around them is written in Python, Go, Bash or Ruby. You also mentor junior and mid-level engineers. Order.co engineers are speaking at SF Ruby 2026 about agentic Rails in production.

Chime's Trust & Safety team is modernizing one of the platforms that keeps members safe from fraud and risk. This backend engineer sets technical direction on projects, designs the APIs behind the mobile app, and mentors other engineers. The posting asks for Ruby on Rails or a comparable framework, plus transactional databases and caching.

Gusto's Financial Infrastructure team owns the money and asset flows behind Gusto Retirement: payments, settlements, reconciliation, 401(k) loans, KYB/KYC, and tax and compliance integrations. This hands-on staff role owns backend services and APIs end to end and mentors engineers. Eight-plus years, with Ruby on Rails or a comparable backend framework. $163K to $204K in Denver and most remote locations, $197K to $247K in SF, Seattle, and New York, plus equity.

OmbuLabs, the team behind FastRuby.io, is a boutique Rails agency of about 25 people that runs Rails upgrades, code audits, and feature work for clients of every size. Senior contractors work 20 to 30 hours a week on client projects in Ruby, Rails, RSpec, PostgreSQL, React, and Heroku, with pairing and code review. Remote from anywhere with four hours of overlap with US Eastern time. FastRuby.io is an Emerald sponsor of SF Ruby 2026.

Chime is hiring a full-stack Growth Engineer to build product experiences that move business metrics: React and TypeScript on the front end, Rails and Go services behind it. You work closely with product, design, and data science on features that drive member growth. Chime is an Emerald sponsor of the SF Ruby Conference.

Chime is hiring a full-stack engineer for its Membership team, building and evolving the features that deepen member engagement and retention across Chime's membership products. The posting asks for proven experience with Ruby on Rails or a comparable framework, alongside TypeScript and React.

Gusto is hiring a Senior Staff Engineer on Tax Platform Engineering to build the core platform behind tax compliance for millions of people, guiding projects end to end from feature spec to rollout. The posting describes the work as helping scale one of the largest Ruby/Rails and TypeScript/React applications in the world. Gusto powers payroll, benefits, and HR for more than 500,000 small businesses.

Gusto is hiring a Staff Software Engineer on AI Voice and Content, working in a collaborative, test-driven environment where experience with Ruby on Rails is listed among the things they look for. Gusto runs one of the largest Ruby on Rails and TypeScript/React applications in the world, powering payroll, benefits, and HR for more than 500,000 small businesses.

Chime is hiring a Software Engineer in the Lending org, building the backend platforms behind its credit and liquidity products (MyPay earned-wage access, SpotMe overdraft, and Instant Loans). You'll design real-time money movement, underwriting, ledgering, and repayment systems where correctness, reliability, and auditability matter, working in Ruby on Rails alongside Product, Risk, and Finance. Chime is the largest US consumer fintech, helping everyday Americans build credit and get ahead.

Gusto is hiring a Senior Staff Engineer to serve as a Technical Lead across the Money Group — its fastest-growing org and the cornerstone of Gusto's shift into a Small Business Finance Platform. Shape the technical vision for the systems powering financial accounts, money movement, lending, and expense controls, guiding architectural direction across 15-20 engineers while still prototyping and shipping. Help scale one of the largest Ruby/Rails and JavaScript/React applications in the world. $189k-$236k base in Denver and most remote locations, $223k+ in SF/NY + bonus + equity.

Superconductor is building a platform where AI agents find work autonomously across customer emails, bug reports, session replays, Slack threads, and X posts, then ship code while you sleep. The Principal Web Developer is the architect, reviewer, and quality guardian for the fleet: defining patterns, evolving the Rails application architecture, writing agent instructions and coding standards, and being the last line of defense before code reaches production. A realistic goal from the team: ship more quality code in your first month than you did in all of 2025. Team of 7, $7M raised, founders previously co-founded Gradescope and were AI PhDs at UC Berkeley. Hybrid in the East Bay (3 days in a BART-accessible office, 2 from home). 10+ years of Rails experience required, ideally 15+. Bonus points for active Rails community involvement (conferences, gems, open source) and experience with React, Tailwind, Stimulus, Turbo, Hotwire, and AI coding tools like Claude Code, Cursor, or Copilot.

Gusto is hiring a Staff Software Engineer to join the Core AI Platforms team — engineering the core business engine that 5+ product teams depend on. Help scale one of the largest Ruby/Rails + JavaScript/React applications in the world. Build reliable backend services, set the engineering standard for those around you, and partner with Product Engineering, Product Management, Data, and Design to translate customer pain points into solutions. AI is a fundamental part of how work gets done at Gusto. Hybrid in SF / Denver / NYC. $163k-$204k base depending on location + bonus + equity.

Kikoff is hiring recent grads onto the engineering team behind its credit-building products, which millions of people use. The backend is Ruby on Rails on AWS with deliberately plain infrastructure; the web and mobile apps are React on Vercel and Flutter. Kikoff is profitable, pre-IPO, and valued as a unicorn; the founders previously built three fintech unicorns. One of the few true new-grad Rails roles in San Francisco.

Koah Labs is hiring at the ground floor for an early-career engineer, one of the few genuinely junior Rails roles in the Bay Area right now. You help shape core systems in the ad network powering AI-native products, on a small team out of San Francisco with backgrounds at X, Apple, and Meta. Core application is Ruby on Rails, React, and TypeScript; data is PostgreSQL, ClickHouse, Redis, and Kafka; infra is Terraform and AWS.

Ascend builds payments and financial-automation software for insurance, on a Ruby on Rails API with a Next.js and TypeScript frontend. This engineer works with customers, sales and engineering to scope integrations and ship the production code, API integrations and custom features that take each new account live. The posting asks for 3+ years of experience and welcomes engineers new to Rails, and Ascend is a Series B startup.

Fathom is the AI meeting assistant that captures and summarizes calls. This full-stack role ships customer-facing features across the web app, the Electron desktop app, a Chrome extension, search and chat, the public API and the MCP server. The stack is Rails with Sidekiq, TypeScript, MySQL and Redis on GKE.

Folio's forward-deployed engineer leads implementations with hotel partners, integrating with their ERP and property management tools. The codebase is a Ruby on Rails app with TypeScript Node automations on AWS. You build reusable integration patterns that shorten hotel onboarding.

Checkr is hiring a senior backend engineer for motor vehicle record screenings, from ordering and retrieving records to delivering them in reports. You own features from design to release, improve reliability and turnaround time, and mentor engineers. The posting asks for 5+ years on scalable backend systems. Checkr has hosted the SF Ruby meetup.

Ascend builds payments and financial-automation software for insurance. This engineer expands the core product, including features, dashboards, and checkout flows, with some customer-facing work. The backend is a Ruby on Rails API on Heroku, with a Next.js and TypeScript frontend. The posting asks for 1 to 3 years of experience, and Ascend is a Series B startup.

GitHub.com runs on a Ruby on Rails monolith. This staff engineer joins Planning and Tracking, the team behind GitHub Issues and Projects, and writes mostly React, TypeScript, and Rails, leaning toward the front end and the Copilot features inside Issues. Nine-plus years, with mentoring and code review as part of the job. SF-headquartered, remote across the US.

General Medicine is building a healthcare store from the founders of PillPack and Amazon Pharmacy, with upfront cash and insurance prices for visits, prescriptions, labs, and imaging. Its engineers are generalists who also write product specs, query SQL, and own QA. The stack is AWS, Ruby on Rails, and Next.js. Four-plus years of full-stack work. Hybrid three days a week at the Spear St office. Series B ($120M, led by a16z).

Circle's AI Quality team builds the evaluation pipelines, observability, and diagnostics that show whether the platform's AI agents work and where they break. This lead is hands-on in the code and manages the team. Ruby on Rails is the production system the agents are built on, with Python for the evaluation side. Seven-plus years shipping production software, ideally LLM agents that take real actions. U.S.-benchmarked pay globally, 35 days of paid time off, two company retreats a year.

Authorium is a GovTech SaaS company that unifies procurement, grants, and budgeting for state, local, and federal agencies, on a platform that manages billions in public funds. This foundational role ships versioning systems, approval workflows, and permission models, and helps modularize the core domain of a Ruby on Rails modular monolith. Three-plus years of full-stack experience; Rails and React or Next.js are a plus. The team works AI-first with Cursor and Claude.

Healthie, the API-first EHR and practice-management platform behind more than 40,000 providers, is hiring senior engineers for its Web Engineering team. The work is primarily in the monolith: Rails on the backend with React, TypeScript, and GraphQL on the front. Hybrid in Los Angeles or New York.

Smartleaf is a founder-led Boston company whose portfolio rebalancing service handles over $90 billion in assets. The feature team works across the UI, JavaScript, and back end to make portfolio management clear for financial advisors. Stack is Ruby on Rails, Stimulus, React, PostgreSQL, and Debian, with open-source coding agents and local LLMs. Two to six years of experience. Remote candidates travel to Boston a few times a year.

Reveal Technology builds software for public-safety and defense users at the tactical edge, and raised a $30M Series B led by Ballistic Ventures in 2025. This engineer owns the core web applications and the APIs behind mobile apps that must work disconnected, low-bandwidth, and fully offline: high-performance Ruby on Rails APIs, modern React, and hard data-synchronization problems. A second Rails and React full-stack role, on the data-platform team, is on the same board.

Quantic is an accredited online business school built on its own interactive learning platform, with content authoring tools, an AI tutor and advisor, and student networking. This staff role moves across the platform: five-plus years of Ruby on Rails in production, data modeling, SQL profiling, PostgreSQL, and five-plus years of JavaScript and React; Kubernetes and Helm are a plus. Series A ($15M, 2022).

Stripe's new-grad program for engineers with up to 18 months of experience. Stripe works mostly in Java, Ruby, JavaScript, Scala, and Go; Ruby is the language of much of the core payments platform, so a new grad here reads and writes a lot of it. Stripe processes trillions of dollars a year for more than 10 million businesses and ships product upgrades daily.

Corporate Tools, the bootstrapped company behind Registered Agents Inc, hires junior engineers and teaches them Ruby, Rails, and Vue on the job. The team builds new Rails applications and maintains older Rack apps for the company's business-services platform. One year of professional experience or a CS degree; Rails experience is preferred but not required.

Tread is a Series A, Mucker-backed platform for construction materials logistics, with over $1B in monthly delivered load value and a payments stack that settles about $1B a month in hauler payouts. Engineering is under ten people across backend, frontend, and mobile. The backend is a Rails API on Postgres with React on the web and Flutter on mobile; strong Rails or a comparable framework and a fast ramp.

CrewAI, the multi-agent framework and enterprise platform behind 300M+ agent executions a month, is hiring a frontend-leaning full-stack engineer for its Agent Management Platform: the Rails web product where teams deploy, monitor, and govern agents in production. Rails, Hotwire, ViewComponent, and Tailwind alongside React, TypeScript, and Vite; tests in Minitest/RSpec and Vitest. Seven-plus years of product engineering.

HireArt is a roughly 75-person staffing platform for sourcing, employing, and managing contract workers. This senior role works on the core staffing application, a large modular Rails 8.1 monolith with React 18 and some Stimulus and Turbo on the front, PostgreSQL and Redis, deployed on Heroku. Engineers work across the stack and are expected to use AI tools while owning what they ship. Eight to ten years of experience.

Boldin (formerly NewRetirement), the Mill Valley financial-planning platform that raised a $20M Series A in 2024, is hiring a full-stack engineer on its Time to Value team, the group that shortens the path from signup to a first useful plan. React and TypeScript on the front end, Ruby on Rails on the back end.

Numero builds fundraising software for political campaigns, from city council races to the US Senate, and has helped them raise more than $10B since 2019. The platform is a Ruby on Rails monolith serving TypeScript and React frontends over a GraphQL API, with Sidekiq and RSpec, and the team is now building agents on its own Ruby LLM tooling. Around six years of experience running production systems with real traffic; continental US, with one or two retreats a year in California.

Frame is a compliance-and-payments infrastructure company for regulated industries: one platform that moves money and embeds the compliance around it. The Ledger Platform engineer works primarily in Rails, Go, and TypeScript on systems where correctness is mandatory. Four-plus years with strong Rails and TypeScript; developer-facing APIs and Go are a plus. A sibling role owns the Risk Platform.

The second Frame opening builds the risk and compliance systems behind its merchant model: the infrastructure that decides who gets approved, what gets flagged, and how fast the company acts on a signal. Primarily Rails, Go, and TypeScript; four-plus years, with classification pipelines, document processing, and anomaly detection as pluses.

Endless Commerce, a Pear VC-backed startup, builds multi-channel commerce infrastructure for order management, fulfillment, and integrations. The backend is Ruby on Rails with Sidekiq, PostgreSQL, Redis, and Heroku, and this role develops the services and APIs behind it. Five-plus years of backend work with a strong emphasis on Rails; remote accepted.

Tern is building the operating system for travel advisors, a $127B industry that is 98 percent small businesses, and ships every week. It is a Ruby on Rails application with a Hotwire front end on Postgres, hosted on Heroku and moving to Google Cloud. Engineers move across squads: data models, Hotwire UI, background jobs, integrations, mobile. Series A ($13M, 2025), AI-native and low-ego by its own description.

Folio is building B2B commerce infrastructure for hospitality, starting with hotels, and raised a $14M Series A from Thrive in 2025. Folio is a Ruby on Rails app on Postgres, with TypeScript Node automations and Elasticsearch on AWS. This backend role is for a specialist in server-side design and APIs with eight-plus years on teams that shipped. Remote-first, with quarterly stays at partner hotels. Full-stack and forward-deployed variants of the role are open on the same board.

Folio's full-stack generalist role: equally at home in Ruby on Rails and Hotwire as in TypeScript, React, and Node, building the hotel-facing product from spark to shipped. Eight-plus years as a senior contributor on early-stage teams; founders welcome.

Koala Health delivers pet medications in presorted pouches and raised a Series B in 2025. The principal engineer is the technical leader across the engineering org: expert-level Ruby on Rails, distributed systems, APIs, data modeling, and cloud, with ten-plus years operating production-scale systems.

Fabric (formerly Florence), the healthcare automation company that raised a $60M Series A from General Catalyst in 2024, is hiring a senior engineer for its virtual care platform. The work is in Ruby on Rails: fixing complex production bugs, performing precise live-data corrections, and hardening the platform clinicians depend on.

Tremendous lets 20,000 organizations, including Atlassian, MIT, and United Way, send payouts and gift cards to millions of recipients worldwide. It is profitable with no outside investors, fully remote, high-documentation, and low-meeting. Ruby on Rails and React (or a similar JavaScript framework), PostgreSQL, Google Cloud. An Engineering Manager role ($250K to $300K) is open on the same stack.

Tremendous is hiring an engineering manager for its payouts platform: Ruby on Rails, TypeScript and React, PostgreSQL, Google Cloud. Eight-plus years of engineering with at least two leading a team as a manager or tech lead, in a profitable, bootstrapped, fully remote company.

Corporate Tools, the bootstrapped, investor-free company behind Registered Agents Inc, is hiring senior Rails engineers to peel monolith code into well-organized architecture across its business-services platform. Advanced ActiveRecord and Sequel, new Rails apps alongside older Rack apps, Vue on the front. A mid-level Software Engineer ($90K to $140K) and a Junior role are on the same page.

Karias is a seed-stage health-benefits platform combining self-funded plans with an AI-enabled navigation layer. The stack is Ruby on Rails and Python on AWS (RDS, S3, Redshift, Glue, OpenSearch) with RAG pipelines on HIPAA-eligible LLMs, and the team expects AI-assisted development across the lifecycle. Seven-plus years, comfortable making structural decisions inside a mature Rails codebase.

Goodbill uses AI and software to cut hospital costs for 5,000-plus employers and 250,000 patients, and was named one of TIME's Best Inventions of 2023; investors include Eniac, Maveron, and Reach Capital. The stack is Ruby, HTML, CSS, and JavaScript with Rails, SCSS, and Hotwire. They want someone who has worked at a pre-seed to Series A startup before.

Checkr is hiring a senior full-stack engineer on its Trust team, the group that keeps the background-check platform honest at scale. The posting asks for advanced knowledge of Ruby (Rails) and JavaScript (React), 5+ years of full-stack experience, and comfort using AI tools day to day. Checkr has hosted the SF Ruby meetup.

Decile Group runs VC Lab, the leading venture-capital accelerator, and the Decile Hub fund-operations platform. This role is for an experienced Ruby on Rails developer with an emphasis on front-end work, owning projects end-to-end and building directly with the people who use the tools (the interview includes a Rails coding challenge). Must work within a few time zones of Pacific. Palo Alto HQ, remote.

Fathom is the AI meeting assistant that captures, summarizes, and organizes calls so teams stay present without losing context — a fast-growing, YC-born consumer AI product. This backend role builds the core platform on Ruby on Rails and Sidekiq alongside Go services, running on GKE with MySQL, Redis, and Kafka. Remote (US). $180K-$240K plus equity.

WindBorne flies the world's largest smart weather-balloon constellation and builds WeatherMesh, the AI forecast model that has beaten DeepMind's GraphCast. The Gov Platforms team builds government-compliant versions of WindBorne's core platforms (FedRAMP, ITAR, NIST 800-53), adapting the data pipelines, APIs, and analysis tools for federal customers. Full-stack across Ruby on Rails (frontend), Python and Rust (backend), and Postgres; 5+ years. Khosla-backed (~$25M raised, Series A). Redwood City or remote (US).

SerpApi is a profitable, bootstrapped API for real-time search-engine results (Google and dozens more), trusted by developers at scale and a Rails Foundation member. This junior full-stack role builds and maintains the product across Ruby, Rails, MongoDB, and JavaScript, deployed on AWS. Remote-first, US-eligible; the team is based in Austin, TX. $80K-$100K base plus profit share.

EDO is a TV measurement and advertising-analytics platform. This role builds data-visualization and reporting features on a Ruby on Rails backend with a React/TypeScript frontend. Stack: Rails, React/TypeScript, MySQL, Snowflake, AWS. Los Angeles, CA company, remote-US. (Series B.)

Better Stack is building an AI-native incident-response and observability platform. This full-stack role works on a Ruby on Rails backend with a Vue.js frontend, on PostgreSQL, Redis, ClickHouse, and Redpanda. Remote across North America (US-eligible). (Series A.)

Relevant Healthcare is a bootstrapped, profitable ~24-person team building a healthcare-analytics platform for safety-net providers (community health centers). This senior/lead role (5+ years) works across a Ruby on Rails backend with a TypeScript/React frontend, Go, and GraphQL. Fully remote, US/Canada.

Ubicloud is building an open-source alternative to the big clouds — elastic compute, block storage, managed PostgreSQL, GitHub Actions runners, Kubernetes, and AI inference — serving 500+ customers. The control plane is written in Ruby on the Roda framework with Sequel and PostgreSQL (not Rails), and that codebase is fully open source. You'll work across the Postgres, GitHub Actions, and AI inference products, building real systems software in Ruby. Mid-stage role (2-8 years). $95K-$250K base + 0.15%-0.50% equity.

AngelList is hiring a back-end-focused Senior Software Engineer on its Accounting team to build the accounting infrastructure behind its fund-management platform — scalable systems that model financial workflows, read and write to the general ledger, and produce audit-ready outputs with rigorous data integrity. Stack is Ruby on Rails (or a similar MVC framework), React, TypeScript, Postgres, and MySQL. 5+ years of experience, back-end weighted, with room to venture into the React/TypeScript frontend. Hybrid, two days per week in SF or NYC.

AngelList is hiring a full-stack Senior Software Engineer to build the financial infrastructure powering private markets. The two primary languages at AngelList are Ruby and TypeScript, and this is a generalist role (or a back-end specialist comfortable across the stack) with 4+ years building large-scale web applications. A single application is considered for all open team-specific roles. Hybrid, two days per week in SF or NYC.

Thatch is hiring an Infrastructure Engineer to ensure reliability, security, and performance across its HIPAA-compliant environment, building infrastructure-as-code and improving CI/CD. Stack is Ruby on Rails, PostgreSQL, and Terraform. Thatch is building the modern ICHRA health-benefits platform that lets employers give employees money to buy their own health coverage.

Simple AI (YC S24, $14M raised) builds voice AI agents that handle enterprise phone operations — support, order intake, lead qualification — for customers like DoorDash and xAI. This is a founding full-stack role; the core work is LLM/voice AI systems, with Ruby on Rails listed among the 'nice to have' stack experience alongside Python, TypeScript, React, PostgreSQL, and AWS. 4+ years of experience.

Mudflap (Palo Alto) is a profitable fintech building fuel-payment products for the $800B trucking industry, helping truckers save on fuel and connecting fuel stops with new customers. You'll build and scale the Ruby on Rails payments and transactions platform end-to-end; the posting spans levels from 1+ to 8+ years. Stack: Ruby on Rails, PostgreSQL/AWS Aurora, Vue.js, REST APIs, AWS ECS, CircleCI.

Luthor (YC F24) is an AI-powered marketing-compliance platform for regulated industries — fintechs, banks, and investment advisors — reviewing and enforcing policy on marketing content as it's created. As one of the first full-time engineering hires, you'll work directly with the founding team on the core Ruby on Rails platform; 3+ years of experience. Stack: Ruby on Rails, React, PostgreSQL, JavaScript.

Prevail Legal is an SF legal-tech startup building the legal industry's Testimony Intelligence Platform — remote court reporting, AI-assisted transcription, and testimony management (SOC 2 Type 2, ISO 27001). This senior full-stack role builds end-to-end on a Ruby on Rails monolith with the Hotwire stack, reporting to the CTO; 3-5+ years of Rails. Stack: Ruby on Rails, Stimulus/Hotwire/Importmaps, PostgreSQL, AWS, Docker, WebRTC.

Prevail Legal is an SF legal-tech startup building a Testimony Intelligence Platform for the legal industry. This mid-level full-stack role builds web applications and new features on a Ruby on Rails monolith (Hotwire stack) in a fully remote setting; 4+ years of Rails.

Instrumentl is a profitable, YC-backed SaaS automating grant discovery and management for 1,500+ nonprofits. This full-stack generalist role builds and scales the product end-to-end on a Ruby on Rails stack; 7+ years of experience. Stack: Ruby on Rails, Python, JavaScript, PostgreSQL, Redis. Distributed team with an Oakland office.

Ascend is an all-in-one payments and financial-automation platform for the insurance industry: online customer payments, premium financing, and commission/carrier-payable distribution. The backend is a Ruby on Rails API on Heroku, with a Next.js + TypeScript frontend on Vercel, Tailwind, PostgreSQL, and Redis. ~50+ people across SF and Columbus. (Series B.)

Middesk is a business-identity-verification fintech (YC, Sequoia, Accel) that helps companies onboard and underwrite other businesses. This full-stack product role builds on a Ruby on Rails + PostgreSQL backend with a React/Redux frontend; all levels welcome. Hybrid in SF, two days per week. (Series B.)

Found is business banking for the self-employed (founded by ex-Square execs), with banking, tax automation, and expense tracking built on Ruby on Rails. This full-stack role requires production experience with Ruby on Rails or a comparable framework; Stack: Rails, React, Redux, TypeScript, MySQL, Spanner.

Koah Labs is hiring a Backend Software Engineer to design data models, abstractions, and high-performance systems for the ad infrastructure powering AI-native products. Example projects: build scalable data models that align publisher and advertiser interests across multiple impressions per ad request, design abstractions for new ad formats and engagement tracking, build a low-latency frequency-capping system to prevent ad fatigue, and create schemas for high-volume ad bidding with exchanges. Stack: Ruby on Rails, React, TypeScript, PostgreSQL, ClickHouse, Redis, Kafka, AWS. Active users of palkan's layered design for Rails, Lefthook, Yabeda, and test-prof. Backed by Theory Ventures, Forerunner Ventures, and South Park Commons.

Koah Labs is hiring a Product Software Engineer to ship across the stack and shape product direction for an ad network powering AI-native products. Lead initiatives end-to-end with high agency in product and technical design — optimize matching algorithms, build experiences reaching millions of users, partner with data and GTM teams, and run experiments to learn how users interact with AI-native products. Strong fit for former founders or early-stage engineers comfortable with ambiguity and fast feedback loops. Stack: Ruby on Rails, React, TypeScript, PostgreSQL, ClickHouse. Active users of palkan's layered design for Rails, Lefthook, Yabeda, and test-prof. Backed by Theory Ventures, Forerunner Ventures, and South Park Commons.

Koah Labs is hiring a Platform Software Engineer to design, build, and maintain the infrastructure powering an ad network for AI-native products. Operate serious systems at scale, own the platform layer beneath the product, and build reliable systems with rigor on performance and observability. Infra stack: Terraform, AWS, LGTM (Loki, Grafana, Tempo, Mimir), Tailscale, Cloudflare. Data: PostgreSQL, ClickHouse, Redis, Kafka, Python. Core app: Ruby on Rails, React, TypeScript. Active users of palkan's layered design for Rails, Lefthook, Yabeda, and test-prof. Backed by Theory Ventures, Forerunner Ventures, and South Park Commons.

Mon Ami is a San Francisco company building software for the aging and disability services sector — the platform that Area Agencies on Aging and public agencies rely on to manage caregivers and deliver senior services. As a Senior Rails Engineer you'll design, build, test, and maintain core product software, lead a defined area of the codebase, and mentor 1-3 junior engineers alongside product managers. The stack is Ruby on Rails, PostgreSQL, Hotwire/Turbo, Stimulus, ViewComponent, Bootstrap, and RSpec, with a heavy emphasis on disciplined testing and code quality. Apply by email to job-srdev@monami.io.

Finta is hiring a Founding Engineer to collaborate directly with the CEO and designer on complete product features end-to-end, from backend to frontend. Work with Ruby on Rails, Hotwire, Stimulus, Tailwind, and Redis to build banking and accounting integrations with rigorous data-quality and reliability standards. Finta automates bookkeeping, files taxes, and gives companies real-time financial metrics. 6+ years of Rails experience required. Regular use of AI coding tools (Cursor, Claude Code) expected. $150-$250k base + 5% equity.

Thatch is hiring a Full Stack Software Engineer to own product areas spanning frontend and backend systems for its health benefits platform. Build across React, TailwindCSS, and Ruby on Rails to ship features that directly impact employer benefits management, employee onboarding, and payment systems. Strong product judgment, systems thinking, and a track record of shipping production applications required. $161k-$230k.