Senior Fullstack Software Engineer (Adtech)

TL;DR

Senior Fullstack Software Engineer (React/Node.js): Building and maintaining full-stack projects for an adtech ecosystem with an accent on scalable APIs and modern web architectures. Focus on designing REST/GraphQL services, implementing automated testing, and contributing to high-level architectural decisions.

Location: Hybrid (Remote in day-to-day, but required to visit Berlin for larger features and brainstorming sessions)

Company

An adtech company focused on building a scalable ecosystem for digital advertising.

What you will do

• Build and maintain modern React frontends and Node.js APIs using TypeScript.
• Design and implement scalable REST or GraphQL APIs.
• Collaborate with backend engineers, designers, and product owners to translate requirements into solutions.
• Write clean, maintainable code with integrated automated tests as part of the workflow.
• Contribute to architectural decisions and the establishment of engineering best practices.

Requirements

• 5+ years of hands-on experience in full-stack JavaScript development.
• Deep knowledge of Node.js (Koa, Express, or Fastify), TypeScript, and React.
• Proficiency in relational databases such as MySQL, MariaDB, PostgreSQL, or SQL Server.
• Mandatory hands-on experience in automated testing using frameworks like Jest or Vitest.
• Ability to attend on-site sessions in Berlin when necessary.

Nice to have

• Experience with AWS, Jenkins, Grafana, or Graylog.
• Knowledge of Shell scripting.
• Experience with GraphQL.

Culture & Benefits

• Ownership-driven environment with no micromanagement or unnecessary bureaucracy.
• "Build > Talk" mentality focusing on shipping production-ready code.
• Smart Fridays (possibility of a 4-day work week).
• 30 days of vacation plus additional paid days off on December 24 and 31.
• Mobility benefits including Germany ticket and JobRad.
• Health, mental health support, and corporate benefits.