Ruby on Rails Developer

As a Ruby on Rails Developer, you'll work on a production Rails application that includes customer-facing features, internal systems, and external integrations. This is an end-to-end ownership role; you'll take features from design and implementation through testing, performance tuning, and production readiness. Responsibilities: Design, build, and maintain features in a modern Rails codebase. Own background and asynchronous workflows, including retries, idempotency, throughput, and observability. Model, query, and optimize data storage in PostgreSQL. Diagnose and resolve production issues in collaboration with product and support. Improve system reliability, performance, and operational safety. Contribute to long-term code health through refactoring, testing improvements, security practices, and thoughtful code review. Technical Stack: Ruby and Rails 8.x Redis-backed background job systems Hotwire, Turbo, Stimulus-style JavaScript, and modern asset tooling such as esbuild and Tailwind-style CSS Observability tooling including APM, error tracking, logging, metrics, and rate limiting Comprehensive automated testing across unit, integration, and system layers C1 English proficiency or equivalent. Senior-level, hands-on experience building and operating production Ruby on Rails applications. Strong background in background job systems and asynchronous processing, with real-world operational experience. Experience designing and querying relational data models in PostgreSQL, with attention to indexing and performance. Experience building external-facing APIs with authentication, authorization, and rate limiting. Strong testing discipline and experience diagnosing flaky or non-deterministic tests. A security-minded approach to application design and production operations. Preferred Qualifications Experience working at high-growth startups. Experience building products using LLMs or LLM-based agents (LangChain experience is a plus). Experience training AI models: building and cleaning datasets, setting up training pipelines, and evaluation benchmarks. Experience building code generation or code editing tools. A team-player mentality with a track record of influencing and improving development processes. Nice to Have: Email and Deliverability Domain Experience with the Xero or QuickBooks APIs. General bookkeeping or accounting domain knowledge. Comfort using AI-assisted development tools responsibly, while maintaining strong engineering judgment, code quality, and test coverage. Compensation: $5,000–$7,000 USD/month, based on experience. PTO: Unlimited Holidays: U.S. or local holidays observed. Fully remote, contractor engagement.