We're looking for a Senior Ruby on Rails Engineer to join Payforge and help build a new fintech product from the ground up. This is an incubator, not a feature team — you'll help define the problem, shape the architecture, and build the services that move money, manage accounts, and integrate with the providers that power modern financial products.
Beyond strong technical expertise, we're looking for someone who brings clarity, speed, and high ownership, and who can move a product forward when the problem, the provider, the architecture, and the go-to-market are all still being defined.
Key Responsibilities
- Design, develop, and own backend services in a Ruby 3.4 / Rails 8 API on PostgreSQL, with GraphQL as the main application contract and DDD / subdomain-oriented business modules.
- Take features end-to-end across the stack — from data modeling and GraphQL APIs through to the React 18 + TypeScript UI (Nx/Yarn monorepo, Apollo/GraphQL, Chakra/Pie, Rspack).
- Design and operate background and async workflows using GoodJob, an event-publishing system, scheduled jobs, ActionCable/WebSockets, and Redis.
- Integrate with fintech provider APIs (Stripe, Unit, Increase, Column, and similar) for treasury, banking, cards, and payments capabilities.
- Build core money-movement primitives — ledgering, KYC/KYB flows, and provider integrations — with correctness, auditability, and reliability as first-class concerns.
- Ship to production through Docker images, Buildkite, and Kubernetes on AWS (S3, SQS, Lambda, Bedrock), with observability via Datadog/StatsD and Sentry.
- Write high-quality, testable, and maintainable code, with strong automated test coverage across the stack (Vitest/RTL and Cypress on the frontend).
- Participate in code reviews, continuous improvement of CI/CD pipelines and deployment workflows, and the engineering practices of an early-stage team.
- Make pragmatic calls between "do it right" and "do it now" as the product and architecture evolve.
Skills & Experience
- Experience: 5+ years of professional software engineering experience, with strong hands-on Ruby on Rails delivery.
- Strong knowledge of Ruby 3.4 and Rails 8, building API-first applications with GraphQL as the primary contract.
- Solid PostgreSQL and data-modeling skills, with experience structuring DDD / subdomain-oriented business modules in a modular codebase.
- Experience with background and async work — GoodJob (or equivalent), scheduled jobs, event publishing, ActionCable/WebSockets, and Redis.
- Comfort working across the frontend in a React 18 + TypeScript Nx/Yarn monorepo (Apollo/GraphQL, Chakra/Pie, Rspack, Vitest/RTL, Cypress) — full-stack comfort is a real advantage given the end-to-end ownership.
- Knowledge of Docker, Buildkite, and Kubernetes, plus AWS services such as S3, SQS, Lambda, and Bedrock.