SENIOR MACHINE LEARNING ENGINEER (ALL GENDERS) - BABBEL LABS
ABOUT BABBEL LABS
Babbel Labs is building the future of language learning. We are an AI-first, independent company within the Babbel group, based in Berlin. Our teams bring AI, research and product together to ship experiences that set a new standard for how people learn.
THE ROLE
Babbel's learner-personalisation engine tracks what a learner has and hasn't mastered, and decides what they should practice next. We are actively pushing personalisation further; moving beyond describing a user and prescribing targeted practice, to adapting the learning journey ahead of them.
This is a hands-on senior individual-contributor role on that team. You will own real subsystems end to end and make decisions about how to improve the personalisation engine. That includes everything from research and benchmarking through production, monitoring and incidents that follow six months later.
HOW YOU'LL MAKE AN IMPACT
- Work directly with the Principal Scientist to take designs from spec into production, then keep improving what you’ve built on your own judgement rather than waiting to be told what’s next.
- Help shape new features from the beginning - not just implementation of a spec handed to you.
- Take real ownership of core personalisation and mastery-tracking subsystems, operate independently, and make decisions confidently and competently.
- Design the evaluation that tells you whether a change is real: a rigorous offline benchmark against a real baseline, and the online experiment that confirms or kills it