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

Requirements

• 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.

Benefits

• Compensation: 5,000–7,000 USD/month, based on experience.

• PTO: Unlimited

• Holidays: U.S. or local holidays observed.

• Fully remote, contractor engagement.