Senior Fullstack Engineer with Go

Babbel

Berlin, Germany

Join Babbel's mission to create mutual understanding through language! As a Senior Fullstack Engineer on our cross-functional team, you'll be the driving force behind the systems that power engagement-focused features for millions of language learners worldwide.

You'll own backend architecture and development while occasionally supporting frontend initiatives, working closely with iOS, Android, frontend engineers, and design teams to deliver seamless user experiences. Your work will be the foundation for features that help users visualize their progress and stay motivated on their language learning journey.

You will:

Architect and build robust backend systems using Go and TypeScript that power user engagement and personalization features;
Design and implement APIs that serve progress visualization and motivational features across web and mobile platforms;
Develop serverless solutions using AWS Lambda and other cloud services to ensure scalability and performance;
Support frontend development when needed, contributing to React/TypeScript features to maintain platform parity;
Collaborate cross-functionally with product managers, designers, and platform engineers on technical architecture decisions;
Own database design and optimization for both SQL and NoSQL systems supporting user progress tracking;
Drive testing practices across unit, integration, contract, and E2E levels for backend services;
Monitor and optimize system performance, health metrics, and infrastructure reliability;
Balance technical debt with delivery speed while maintaining high-quality backend systems.

You have:

5+ years of backend development experience with modern distributed systems;
Strong expertise in Go and TypeScript/Node.js for building scalable APIs and services;
AWS proficiency, particularly with Lambda, serverless architectures, and cloud infrastructure;
Database expertise with both SQL and NoSQL systems, including design and optimization;
API design experience with RESTful services and understanding of cross-platform requirements;
Frontend awareness with React and TypeScript to support occasional frontend contributions;
Testing mindset with comprehensive experience across multiple testing levels;
System design skills for building engagement and personalization features at scale;
Excellent English communication skills for our international team;
User-focused approach understanding how backend decisions impact user engagement.