Senior Fullstack Engineer (all genders)

Stellenbeschreibung:

Overview

We are looking for a Senior Fullstack Engineer to join our Team in Berlin. 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.

Responsibilities

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 end-to-end 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

Qualifications

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
Cloud: AWS (Lambda, Kinesis, DynamoDB, RDS, and more)
Databases: SQL and NoSQL systems
Frontend: React, TypeScript (for occasional support)
Testing: Comprehensive testing at all levels

Benefits (Some Perks)

Enjoy 30 vacation days, and family and life situation counseling
Flexible working hours and the option to work from our fully equipped office
Jobbatical stays of up to 3 months inside the EU and the UK
Yearly learning & development budget for external training
Full access to Babbel for free language learning
Mobility benefits and a discounted Urban Sports Club membership
Be part of our DE&I Community Networks (such as FLINTA in Tech, and Queer Collective)

Diversity at Babbel

As part of our ongoing journey towards building a diverse, equitable and inclusive company, we welcome everyone to apply, especially those individuals who are underrepresented in tech. We are a learning company, inside and out, and we encourage you to apply even if you do not fit all the technical requirements – all candidates are assessed based on skills, qualifications and on our business needs. Please state your pronouns in your application, and let us know if you’d like to be addressed by a name other than the one appearing on your official documents. If you have a disability or special need, feel welcome to inform us, so that we can provide you with the proper assistance in the application process.