Full-stack Developer

As a leading ad tech company, we help publishers thrive in an increasingly challenging and complex digital world dominated by GAFAs. Our unique AI-based SaaS platform offers a range of products that help publishers optimize their revenue and operational efficiency. Over 100 prestigious customers in 20 countries, including industry leaders such as Microsoft, Dotdash Meredith, and Tripadvisor, use our solutions daily. Tasks Are you a full-stack developer who loves delivering features from end to end? Would you like to work in a start-up environment for the leader in Adtech analytics, using cutting-edge tools like Claude Code to accelerate your workflow? If you enjoy working on problems involving large amounts of data, are curious, passionate, and care about delivering quality user experiences, join our team of talented developers. As part of the BUILD team, you'll be responsible for developing features across our products' full stack — from API design to user interface — with complete autonomy. No more silos: you own your features from start to finish. You will participate in technical design workshops, propose improvements, and work closely with the Product team daily, as well as with our data engineers and data scientists. Mission Deliver end-to-end features, from API design (Ruby on Rails) to user interface implementation (React), ensuring a seamless user experience. Collaborate closely with the Product team to understand requirements, propose solutions, and iterate on feedback. Optimize existing application code to improve performance and maintainability. Take the initiative to improve our architecture, design, and development workflows. Our stack 200+ AWS instances (EC2, S3, SQS, Cognito) 10 TB+ of data ingested every day Backend: Ruby on Rails, Grape API, Sidekiq, Python, Scala Frontend: React, TypeScript, Tailwind CSS, shadcn/ui Databases: MySQL, MongoDB, Snowflake, Redis, Elasticache Testing: RSpec, Jest, Cypress DevOps: Git, GitHub, GitHub A Requirements Core Skills AI-Assisted Development Experience with AI-assisted development tools (Claude Code, GitHub Copilot, or similar): code generation, refactoring, debugging, and codebase exploration. Ability to craft effective prompts and leverage AI tools to accelerate delivery while maintaining code quality. Backend (Ruby on Rails) Design, development, and maintenance of Ruby on Rails applications and RESTful APIs (including Grape). Strong focus on clean architecture, scalable patterns, performance, and performance. Experience with testing (RSpec), code reviews, continuous integration, and technical documentation. Frontend (React) Development of modern web interfaces in React with TypeScript and JSX. Experience with state management (Redux, Zustand) and component-driven architecture. Proficiency with Tailwind CSS and component libraries such as shadcn/ui. Strong UX sensitivity and attention to user experience. Experience setting up and maintaining tests (Jest, React Testing Library, Cypress), an