Postúlate en Kit Empleo: kitempleo.com.ar/empleo/q4l9w

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 Java Script, 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.
- 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

Postúlate en Kit Empleo: kitempleo.com.ar/empleo/q4l9w

📌 Senior Ruby on Rails Developer (Argentina)
🏢 SUR
📍 Argentina