Full-Stack Developer

October 20, 2026

Remote

Middle

France

Keep in mind

Another language required
French

Also worth knowing

English is required

Description

A leading ad tech company is hiring a Full-stack Developer to join its BUILD team. You will deliver features end to end across the full stack — from API design to user interface — with complete autonomy, no silos. The role involves close daily collaboration with the Product team, data engineers and data scientists on large-scale data problems.

Responsibilities

Deliver end-to-end features from API design in Ruby on Rails to React user interface implementation
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 architecture, design and development workflows
Participate in technical design workshops and propose improvements
Work closely with data engineers and data scientists on daily tasks
Develop features across the products' full stack with complete autonomy

Requirements

Experience with AI-assisted development tools such as Claude Code or GitHub Copilot including code generation and refactoring
Design, development and maintenance of Ruby on Rails applications and RESTful APIs including Grape
Experience with testing in RSpec, code reviews, continuous integration and technical documentation
Development of modern web interfaces in React with TypeScript and JSX
Experience with state management in Redux or Zustand and component-driven architecture
Proficiency with Tailwind CSS and component libraries such as shadcn/ui
Experience setting up and maintaining tests with Jest, React Testing Library and Cypress
Strong SQL skills with experience writing complex analytical queries
Familiarity with Snowflake is a plus but not required
Experience with environments mixing SQL in MySQL and NoSQL in MongoDB with Redis and Elasticache caching
Strong engineering discipline with automation, GitHub, CI/CD via GitHub Actions and structured review processes
Experience working with cloud and scalable environments on AWS
3+ years of experience with Ruby on Rails and React with TypeScript
Pragmatic and autonomous, able to take a feature from design to production
Comfortable working with REST APIs and distributed systems
Embrace modern development practices: testing, code reviews, CI/CD
Strong communication skills and enjoy working closely with Product teams
Care about user experience and pay attention to detail
You are fluent in English, proficiency in French is an asset
You are based in the CET/CEST timezone within ± 2h for team collaboration