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Babbel Logo Babbel · IT - Software Development

Principal Software Engineer - Fullstack, AI

Germany, Berlin · Job Posted April 12, 2026
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Job Description

We are looking for an experienced Principal Software Engineer (Fullstack, AI) to join the Learner Experience Cluster at Babbel and help shape the technology behind impactful, customer-facing learning experiences used by millions of learners worldwide. A Principal Software Engineer at Babbel drives outsized, durable impact across multiple teams by shaping technical direction, improving system-level outcomes, and scaling the effectiveness of others. This is a role defined by influence, planning, and strong role modeling — not authority or heroics.

Job Responsibility

  • Drive architectural coherence and technical direction across multiple customer-facing systems and teams
  • Design and evolve high-leverage APIs, data models, and distributed systems that power learner journeys, personalization, and experimentation
  • Establish shared patterns, abstractions, and standards that reduce fragmentation and increase engineering leverage
  • Act as a role model for AI-native workflows across design, coding, testing, code review, debugging, and incident response
  • Champion effective and responsible usage of AI-assisted development tools and scalable prompting practices
  • Identify and implement opportunities where AI can measurably improve developer productivity, delivery speed, and production quality
  • Define guardrails and evaluation approaches to ensure AI usage is secure, reliable, and aligned with engineering standards
  • Improve delivery performance by advancing continuous delivery, observability, and production excellence practices
  • Anticipate cross-team risks and dependencies early and proactively de-risk them to protect learner experience and commitments
  • Multiply your impact through mentoring senior engineers, influencing without authority, and stepping in hands-on when critical paths require it

Requirements

  • Extensive experience designing, building, and operating distributed systems using Typescript and AWS
  • Deep expertise in APIs, asynchronous systems, data modeling, and service-to-service communication in production environments
  • Strong architectural judgment and the ability to communicate trade-offs clearly in service of product and learner outcomes
  • Proven ability to improve system-level outcomes such as reliability, scalability, delivery speed, and operational excellence
  • Hands-on fluency with AI-assisted development tools and demonstrated integration of AI into daily engineering workflows
  • Experience experimenting with or building AI-powered systems, LLM integrations, or AI-enabled features
  • Pragmatic, metrics-driven judgment in evaluating where AI adds meaningful value versus where traditional approaches are superior
  • A track record of influencing technical direction across multiple teams without relying on formal authority
  • Strong product mindset with experience connecting technical decisions to experimentation and measurable customer impact
  • Demonstrated ability to mentor senior engineers, raise technical standards, and elevate AI fluency across an organization
  • Ability to work in English

Nice to have

  • Experience with LLM evaluation frameworks, prompt engineering at scale, retrieval-augmented generation (RAG), or model experimentation pipelines
  • Experience building or scaling learning platforms, personalization systems, or A/B experimentation frameworks
  • Exposure to domain-driven design, event-driven architectures, or platform engineering
  • Experience shaping engineering operating models or standards during periods of technological transformation
  • Genuine interest in how AI, product, and learning science can combine to create meaningful learner outcomes
  • Experience with Golang

What we offer

  • 30 vacation days
  • 3-month Sabbatical
  • Family and life situation counseling
  • Flexible working hours and remote-friendly options
  • Jobbatical (up to 3 months inside the EU and UK)
  • Fully equipped office with nap, faith and family rooms
  • Internal learning opportunities
  • Yearly learning & development budget for external training
  • Free full access to Babbel & Babbel Live classes
  • Mobility benefits options
  • Discounted Urban Sports Club membership
  • Employee communities
  • Cultural and regular social events
Babbel - All Job Offers

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