Senior Android Engineer

Tandem is the leading global language learning community, where 10 million members in over 180 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.

As a Senior Android Engineer you will work as part of an agile, cross-functional team of designers and engineers to architect, develop, and maintain the Tandem Android app.

This role sits within our “pro” team who are responsible for monetising our users and making our Tandem Pro offering more appealing to our wider user base. Practically, This means that you will focus on project such as implementing social features, rapid experimentation of new experiences and ensuring that our users are aware of all Tandem has to offer.

• have 5+ years of experience with Kotlin/native app development.

• have a passion for clean architecture and SOLID principles.

• have a good experience of writing unit tests, including designing for testability and ideally TDD.

• have worked on large apps that have more than 100,000 users and a good level of complexity.

• have worked in close collaboration to marketing or growth functions in a previous role.

• have the confidence to be the Android expert in the room and happy to both drive and critique technical designs.

What would make your application stand out:

• Experience building realtime chat services.

• Experience with Kotlin multiplatform.

• Experience building apps that handle realtime media (audio / video).

• Experience with iterative design and working with agile cross-functional teams.

Passion for languages: 

We’re a team of 30 people speaking 20 languages fluently between us. For those wanting to improve their German (or Denglisch!), you can join one of our German classes on us.

Take a deep dive: 

As a Tandem team member, we’ll give you a budget for up to 6 “Deep Dive Days” per year. Pick a topic you’ve always wanted to explore for your professional development that has never made it out of your backlog. Then book a cabin in the woods or whatever matches your individual learning style.

Teams who train together, stay together: 

We offer Urban Sports Club gym memberships to boost our team’s physical and mental health. If you prefer, we can contribute to your monthly public transport ticket instead.

It takes a team to Tandem: 

Bonding with our teammates outside of our normal work routine is important to us. We organize regular team events: from day trips to monthly lunches, summer BBQs, and movie nights.

Balance matters: 

Life isn’t just about work. We know when to snooze Slack notifications, recharge our batteries, and take time out for our personal hobbies. As home office has become the new normal for some of us, it’s even more important to be able to switch off from work and relax.

Modern family: 

As part of our family-friendly company philosophy, we embrace flexible working hours, welcome families to our events, and love for our kids to visit the office and get a taste of life at Tandem.

Relocation without the stress: 

If you’re looking to relocate to Berlin, we’re ready to assist you with the infamous German bureaucracy. Many of us have been through it before, so we have plenty of tips to share. You’ll feel settled in no time.

Hybrid by design: 

We’re all about embracing a flexible, modern way of working. That’s why we focus on a hybrid approach—balancing time between our vibrant Berlin-Mitte office and the comfort of your home. It’s the best of both worlds, and we’ll support you in creating the perfect setup for this dynamic way of working.