Ruby on Rails Developer

Role Description

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.

• 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.

Qualifications

• 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.