Senior Ruby on Rails Developer

As a Senior Ruby on Rails Developer you will work on a production Rails application that includes customer\-facing features, internal systems, and external integrations. This role owns work end\-to\-end, from design and implementation through testing, performance, 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 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 **Technical Stack:** * Ruby and Rails 8\.x for backend and API development * Redis\-backed background job systems * Document\-oriented datastores and search or indexing systems * HTTP APIs, OAuth and OpenID\-based authentication, and webhook\-driven integrations * 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 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** * 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 **Benefits** * Compensation: $5000 to $7000 USD/ monthly * PTO: Unlimited * Holidays: US or local