ABOUT TANDEM

Tandem is the leading global language learning community, where more than 30 million members from over 200 countries practice languages together. The concept of learning from each other is not only an integral part of the Tandem community but it is also at the heart of our everyday lives at Tandem. This shared connection through learning helps us to grow and enhances the language journeys of our members.
We are based in Berlin and are backed by top European investors. We are highly international and driven by a shared passion for languages, technology, and culture. Together, we are on a mission to build a product that not only teaches a new skill but also encourages meaningful cross-cultural conversations.
Tandem is looking for an experienced and autonomous Senior Web Engineer to take full ownership of our website and web application. You’ll be the technical lead for our web presence, working independently to build new features, optimize performance, and shape our frontend architecture.

YOUR ROLE WILL BE TO:

• Own the frontend development of our entire web stack — both the marketing site (http://tandem.net) and real-time web app (http://app.tandem.net)
• Build and maintain features for our real-time chat application
• Implement technical SEO and GEO and accessibility best practices (WCAG 2.1)
• Manage and evolve our web component library, ensuring consistency across the UI
• Collaborate closely with product and marketing on features and rapid experimentation
• Report directly to the CTO and operate with a high degree of autonomy

YOU ARE THE RIGHT FIT FOR THE ROLE IF YOU:

• 3+ years of professional JavaScript experience (both frontend and backend)
• Deep experience with Next.js in production environments
• Strong command of TypeScript
• Solid understanding of real-time web technologies (e.g., WebSockets, MQTT)
• A self-driven mindset and passion for ownership and delivery