Full-Stack Developer (Ruby on Rails & React) - Ad Tech

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 publishers need to optimize their revenues and operational efficiency.

Over 100 prestigious customers in 20 countries, including industry leaders such as Microsoft, Dotdash Meredith, and Tripadvisor, use our solutions daily.

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

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• DevOps: Git, GitHub, GitHub A

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), and contributing to long-term maintainability

Data & Storage

• Strong SQL skills with experience writing complex analytical queries. Familiarity with Snowflake is a plus but not required. Experience with environments mixing SQL (MySQL) and NoSQL (MongoDB/Mongoid), and performance/caching tools such as Redis and Elasticache.

Quality & Delivery

• Strong engineering discipline: automation and tooling with GitHub, CI/CD (GitHub Actions), testing, linting (ESLint), and structured review processes. Experience working with cloud and scalable environments (AWS).

About you

• You have 3+ years of experience with Ruby on Rails and React with TypeScript.

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• You're pragmatic and autonomous, able to take a feature from design to production.


• You have strong SQL skills and experience with complex analytical queries (Snowflake is a plus)


• You're comfortable working with REST APIs and distributed systems


• You embrace modern development practices: testing, code reviews, CI/CD


• You have strong communication skills and enjoy working closely with Product teams


• You care about user experience and pay attention to detail


• You are fluent in English. French is a plus


• You are based in the CET/CEST timezone ± 2h (for team collaboration)

• Full remote


• Macbook provide

Ready to join us?

If you're passionate about building quality software, excited about leveraging AI tools to boost your productivity, and want to work with a talented team on challenging ad tech problems, we'd love to hear from you!

At Adomik, we embrace modern development practices – including AI-assisted coding with tools like Claude Code – to help our developers focus on what matters most: solving complex problems and delivering value to our users.

Our recruitment process:

1. Initial call with our Talent team (30 min)


2. Technical assessment (coding challenge)


3. Team interviews with our Head of Build and developers


4. Final discussion and offer

The process takes about 2-3 weeks. Apply now with your CV – we're looking forward to meeting you!