Job
In this role, you will develop an adaptive AI-first learning platform and software tools end-to-end, implement new features and AI automations, making key technical decisions that impact thousands of learners.
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Your role in the team
- StackFuel has been one of the leading providers of data and AI training in Germany for years. Since early 2026, we have been part of Multiverse, Europe's only EdTech unicorn and the largest AI upskilling platform on the continent. Together, we pursue a clear goal: to make 100,000 employees in Germany proficient in AI and thus close the data and AI skills gap in the country.
- To achieve this, we are building the next-generation adaptive learning platform from Berlin, AI-first from the ground up. In addition, we develop software tools and automations that integrate into our clients' B2B platforms. As a Senior Fullstack AI Engineer (m/f/d), you will play a key role in shaping this platform and software tools, from the database to the frontend. Your work directly reaches thousands of learners and contributes to the transformation in medium-sized and large German companies.
- You develop our adaptive AI-first learning platform as well as software-supported AI solutions end-to-end, making independent key technical architecture decisions.
- You implement new features and requirements in our existing Learning Framework, maintaining a balance between new development and further enhancement.
- You integrate AI features into the platform, such as LLM-powered learning support, adaptive learning paths, or automated content generation, and ensure they operate reliably, measurably, and cost-efficiently.
- You develop internal tools and AI automations for Learning Coaches, Client Operations, and Sales to enable these teams to work more efficiently.
- You work closely with the entire engineering team, our content engineering, and the portfolio leads.
Our expectations of you
Qualifications
- You work AI-first and naturally use AI tools in everyday engineering; the Agentic SDLC is not a foreign word but an ideal vision.
- Proficient in PostgreSQL and schema migrations.
- Discipline in testing and CI (e.g., Pytest, typed code, GitHub Actions or similar).
- You speak business-fluent English and ideally German at B1-B2 level.
Experience
- 5+ years of experience in full-stack development, including several years in senior roles (architecture, technical decisions, mentoring).
- Practical experience with LLM APIs in products: prompt design, structured outputs, tool use, evaluation of model outputs.
- Experience with end-to-end development using Python (FastAPI or Django) and TypeScript/React.
- Experience with Docker-based deployment and fundamentals in observability.
What we offer
- You can expect a solution-oriented and data-driven approach, an open feedback culture, and a strong team spirit. Two trustees elected by the entire StackFuel team will support you with questions and concerns as neutral, confidential contacts.
- Take responsibility from day one, actively contribute your own ideas, shape processes sustainably, and significantly influence our workflows.
- We operate in a hybrid model and are typically on-site at our Berlin office three days a week.
- You can work from anywhere within the EU, EEA, and Turkey for up to 10 days per year.
- Regular team exchanges, seasonal celebrations, and a consistently well-stocked kitchen ensure a lively community.
- Complete our online training courses to expand your professional skills and develop into an expert in data and AI.
Benefits
Work-Life-Integration
Topics you will work on
Job locations
About your employer
StackFuel GmbH, based in Berlin-Kreuzberg, develops and markets online training programs for companies in industry and commerce, particularly in the areas of Data Literacy and Data Science.
- Startup
- Onsite, Hybrid
- Education System
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