Company
Technology
SeniorFullstackEngineer
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“Senior Fullstack Engineer. Skills: Fullstack development, API development, Data engineering, AI integration. Design production features on Ruby on Rails API. Ship production features on Ruby on Rails API”
What You'll Achieve.
Ship product at speed; Raise the bar through code review; Raise the bar through documentation; Raise the bar through system design; Raise the bar through feature delivery
Industry & Context.
Architectural clarity; Bias toward simplicity; Cross-service complexity
Work during U.S. business hours, Aligned with client's time zone
What They're Looking For.
Must Have
5+ years Ruby on Rails APIs, 5+ years React applications, Production Python experience, Experience with Docker, Experience with AWS services, Experience with Terraform, Experience with GitHub Actions, Track record writing technical specs
Nice to Have
Rails 7+, ActiveRecord familiarity, Sidekiq familiarity, RSpec familiarity, JWT/auth flows familiarity, PostgreSQL schema design familiarity, Hooks and modern state management patterns, TypeScript proficiency, Modern JS toolchains proficiency, Bun proficiency, Vite proficiency, esbuild proficiency, Dagster experience, Airflow experience, ETL pipelines experience, Snowflake transformations experience, External API integrations experience, Docker Compose experience, ECS Fargate experience, Lambda experience, EventBridge experience, S3 experience, Infrastructure-as-code via Terraform experience, Observability practices understanding, RFCs writing experience, Architecture documentation experience
What You'll Do.
Design production features on Ruby on Rails API
Ship production features on Ruby on Rails API
Build authentication flows
Build background jobs
Design PostgreSQL schema
Maintain API contracts
Improve API contracts
Enforce test coverage
Build React applications
Maintain React applications
Work with modern bundlers
Work with JS toolchains
Contribute to shared component library
Evolve shared component library
Contribute to ETL pipelines
Contribute to Snowflake transformations
Contribute to external API integrations
Manage data workflows
Build inference services
Maintain local development environment
Improve local development environment
Operate within AWS environment
Support infrastructure managed via Terraform
Improve CI/CD pipelines
Drive observability across services
Establish engineering best practices
Enforce engineering best practices
Improve developer experience
Automate with Makefile
Create onboarding documentation
Drive PR improvements
Write architecture docs
Write agent-readable context files
Mentor engineers through pairing
Mentor engineers through documentation
Mentor engineers through review
How You'll Work.
Team & Collaboration
Cross-service complexity; AI agents and engineers collaborate; Partner with Data Science; Partner with ML Engineering
Communication Scope
Technical documentation; Architecture docs
Process & Methodology
Agile
Full Job Description
This role is open to candidates based in LATAM, Africa, and Eastern Europe. Please note that as this role supports U.S.-based clients, candidates must be available to work during U.S. business hours aligned with the client’s time zone. Client Overview Our client is a fast-moving marketing measurement and attribution technology company that empowers e-commerce brands to make smarter, data-driven advertising decisions. Their platform combines a robust Rails API, a modern React frontend, and a Python-powered data and ML infrastructure — all operating across a 20+ repository workspace where AI agents and engineers collaborate side by side to ship product at speed. They are a team that values engineering craft, architectural clarity, and a bias toward simplicity, and they are looking for senior engineers who raise the bar through code review, documentation, and thoughtful system design as much as through feature delivery. Role Overview The Senior Fullstack Engineer will own and elevate engineering quality across a multi-repo platform that spans a Rails API, React frontend, and Python data and ML services. This role sits at the intersection of backend architecture, frontend delivery, and data platform development, making it ideal for a polyglot engineer who is energized by ambiguity and cross-service complexity. The Senior Fullstack Engineer will also mentor fellow engineers, establish best practices, and help design agent-readable systems as AI-assisted development becomes a core part of how the team operates. Location Fully Remote (Work from Home) | 9AM - 5PM EST Key Responsibilities Backend Development - Design and ship production features on the Ruby on Rails API, including authentication flows, background jobs via Sidekiq, and PostgreSQL schema design. - Maintain and improve API contracts using OpenAPI or JSON:API standards consumed by SPA frontends. - Write and enforce test coverage using RSpec, maintaining high reliability across services. Frontend Developmen
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