Senior Full Stack Software Engineer (f/m/d) - React, Node.js

Senior Full Stack Software Engineer (f/m/d) - React, Node.js Apply now We usually respond within three days Remote in our day-to-day work. On-site when it matters. We work remote by default – focused, efficient, and with full ownership. For larger features, architectural decisions, and real brainstorming sessions, we come together in Berlin – fast, hands-on, and without unnecessary meeting overhead. We use AI to accelerate – not to replace thinking. We design the system, steer the output, and take responsibility for what we ship. Fast where it makes sense. Careful where it matters. Your mission You’ll join our UI Engineering team and take ownership of full-stack projects that power our adtech ecosystem. This isn’t just about coding – it’s about collaboration, technical ownership, and making an impact. Here’s what your day might look like: Build and maintain modern React frontends and Node.js APIs with TypeScript. Design and implement REST or GraphQL APIs that scale efficiently. Collaborate closely with backend engineers, designers, and product owners to translate requirements into elegant solutions. Write clean, maintainable, and well-tested code – with automated tests as a natural part of your workflow. Contribute to architecture decisions and best practices – we value opinions backed by experience. Your skills 5+ years of hands-on experience in full-stack JavaScript development. Deep knowledge of Node.js (framework e.g. Koa, Express or Fastify), TypeScript , React and modern web architectures. Solid understanding of relational databases (e.g. MySQL, MariaDB, PostgreSQL or SQL Server) , including database design, SQL querying, and REST API development (GraphQL is a plus). A strong sense of code quality with mandatory hands-on experience in testing , including frameworks such as e. g. Jest, Vitest, or Node’s built-in testing framework – Clean design and automated tests are not optional. Bonus points for experience with: AWS, Jenkins, Grafana, Graylog, Confluence, Jira, Shell scripting Why you’ll love working with us Ownership over tickets: You’re trusted with real responsibility, not just tasks. No unnecessary bureaucracy, no micromanagement – we rely on you to take things forward. Build > Talk: We test what works – not what sounds good. Fail fast, learn faster. High standards, low ego: We take our work seriously, but not ourselves. Direct feedback, honest collaboration, no drama. Stay sharp: Hackathons, conferences, community – we invest in your growth and keep you at the cutting edge. And yes – the fundamentals are covered too: 30 days of vacation + Dec 24 & 31 off, Smart Fridays (4 days week possible), mobility (Germany ticket & JobRad), sports & health offerings, mental health support, corporate benefits, RTL+ access, and more. Your CV is just the starting point. What matters more to us than your resume: a portfolio, a side project, a demo repo – anything that shows you don’t just talk about code, you ship it. Production-ready. Thought through. Done. smartclip is committed to diversity and inclusion. We welcome applications from all qualified candidates regardless of race, ethnicity, nationality, age, gender, gender identity, religion, sexual orientation, disability, or any other diverse characteristics. Department Engineering: UI Engineering Role Software Engineer Web - React, TypeScript Locations Berlin Remote status Fully Remote Technology smartx Ad Server & SSP Ad Product Gallery Technology Partnerships Broadcasters Broadcaster Solutions Product Advisory Board Publishers Resources Resource Hub Adtech Glossary Careers 21 Jobs Culture Blog – Life at smartclip Company About Us Responsibility Newsroom Contact Find out more about your team The Architecture department ensures that we develop and work with robust and future-proof products. Explore more Spoil yourself with corporate perks. Anniversary Programme We treasure every moment you spend with us, and when the days turn into years, we mark it with a little gift — even from your first year! Corporate Benefits Are you sporty, techy, adventurous, stylish, or nerdy? Whichever category you belong to, you can benefit from our numerous discount offerings and get up to 40% off your purchases. Gift Matching Care for a good cause? We do too. When you donate to a charity, we’ll double your donations — up to €250. Mental Health When life happens or if you just want to talk to a mental health expert, we’ve got you covered in Cologne, Hamburg, or remotely wherever you are. Referral Programme Get rewarded when you refer someone for one of our open roles and they get the job. RTL+ As part of RTL Deutschland, you can enjoy all your favourite TV shows with free access to an RTL+ Premium account. Social Day Every year, you can take a fully paid day off to support a cause you care about — together with other smartclippers or alone, you decide. Sports We support a healthy lifestyle through various options such as gym reimbursement, urban sports club membership, or even leasing a bike. There’s definitely something for you. Thank you Programme Every six months, smartclippers can show gratitude and reward exceptional colleagues with a €100 bonus — all on us! See all perks Explore more roles