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

• 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.