Senior Ruby on Rails Developer

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 in a document-oriented datastore environment.
• Build and maintain HTTP APIs and third-party integrations including webhooks, authentication, billing, and notifications.
• 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.

Requirements

• C1 English 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 concerns.
• Experience designing and querying document-oriented data models 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.
• Security‑minded approach to application design and production operations.
• Preferred Qualifications
• Experience working with high‑growth startups.
• Experience building products using LLMs or LLM‑based agents. Ideally, using Langchain.
• Experience training AI models: building, cleaning datasets, setting up training pipelines, and evaluation benchmarks.
• Experience building code generation or editing solutions.
• A team‑player mentality with a history of influencing and improving development processes.
• Nice to Have: Email and Deliverability Domain
• Experience with Go
• Practical understanding of email deliverability fundamentals including reputation, mailbox provider behavior, and bounce or deferral handling.
• Familiarity with email authentication and DNS concepts including SPF, DKIM, DMARC, and MX or TXT records.
• Understanding of SMTP mechanics such as handshakes, response codes, and safe retry strategies.
• Experience identifying and handling low‑quality or risky email data such as disposable, role‑based, typo, or catch‑all addresses.
• Experience building safeguards around email data handling including redaction, privacy controls, and non‑production send protections.
• Comfort using AI‑assisted development tools responsibly while maintaining strong engineering judgment, code quality, and test coverage.
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