Senior AI Engineer

Your mission

About Us

We’re building a new kind of mortgage experience: transparent, digital, and truly customer-centric. We are a Berlin-based B2C Fintech founded by two repeat founders (YC alum, exit) with prior 10+ year careers in investment banking and strategy consulting. We recently raised investment to assemble a 30-person, exceptionally strong core team.

Our culture is built on ownership and clarity. We align with you on vision, set clear KPIs and resources together, and then trust your drive and expertise.

The Opportunity

Buying property (and financing it) is probably the biggest financial decision in someone’s life. It’s complicated, opaque and anxiety-laden.

As a Senior Backend Developer / AI Engineer, you will work alongside our CTO on building and evolving our AI-powered fintech product. The core architecture is in place, providing a solid foundation to build upon as we integrate advanced LLM capabilities, establish AI pipelines, implement intelligent automation, and ship production-ready AI features. You'll be instrumental in shaping how we leverage AI to transform financial services, with significant autonomy to design and implement cutting-edge solutions.

Your profile

What You’ll Do

What you will work on on daily basis

Designing and implementing LLM-powered features and intelligent automation workflowsBuilding robust AI pipelines with proper orchestration, error handling, and monitoringDeveloping RAG (Retrieval-Augmented Generation) systems for financial data processingImplementing and optimizing vector search and embedding strategiesCreating evaluation frameworks for LLM outputs and maintaining quality standardsBuilding prompt management systems and optimizing LLM interactions for cost and performanceIntegrating multiple AI models and managing model versioning/deploymentEnsuring AI safety, reliability, and compliance in financial applications

What You Bring

Hard Requirements

LLM Framework Expertise: Deep hands-on experience with LangChain.js, LangGraph for JavaScript, or similar Node.js-based LLM frameworks. You understand agent architectures, chain composition, memory management, and can build complex multi-step AI workflows in TypeScript/JavaScript.Workflow Orchestration: Production experience with Temporal .io (TypeScript SDK), Bull/BullMQ, or similar Node.js-compatible orchestration solutions. You know how to build reliable, long-running workflows with proper error handling, retries, and state management.Vector Database & RAG Systems: Proven experience implementing RAG architectures using vector databases (Pinecone, Weaviate, Qdrant, or pgvector) with Node.js clients. You understand embedding models, similarity search, and hybrid retrieval strategies.Node.js & TypeScript Mastery: Expert-level proficiency in Node.js and TypeScript with extensive experience integrating AI services (OpenAI, Anthropic, Cohere APIs). You're comfortable with streams, async patterns, WebSockets for real-time AI responses, and optimizing for latency.

Additional Technical Skills

Experience with prompt engineering and prompt management systems accessible from Node.jsHands-on experience with AI model APIs and their Node.js SDKs (OpenAI, Anthropic, Hugging Face, Replicate)Knowledge of AI observability tools with Node.js integration (LangSmith, Helicone, or custom solutions)Proficiency with streaming architectures and Server-Sent Events (SSE) for real-time AI responsesUnderstanding of AI safety, hallucination detection, and output validation techniquesFamiliarity with AI evaluation frameworks and automated testing of LLM outputs

Mindset & Approach

AI-Native Thinking: You think in terms of probabilistic systems, understand LLM limitations, and know how to design robust systems around non-deterministic outputs.Pragmatic Innovation: You balance cutting-edge AI capabilities with production requirements—knowing when to use simple solutions vs. complex AI architectures.Ownership Mentality: You're proactive, resourceful, and accountable for your work—you don't wait to be told what to do.Team Player: You collaborate well with others, can explain AI concepts to non-technical stakeholders, and elevate those around you.Quality-Focused: You understand the importance of evaluation, testing, and monitoring in AI systems and build with observability in mind.Continuous Learner: You stay current with the rapidly evolving AI landscape, experiment with new models and techniques, and are energized by pushing the boundaries of what's possible.

Why us?

What We Offer

Competitive salaryParticipation in our employee options programmeOn-site in Berlin, with flexible remote work as you see fitHigh autonomy, low politics, fast decision-makingThe chance to help build something new, with real influence on how people buy homes in Germany!

About Us

We are an equal opportunity employer. We value diversity and are committed to an inclusive environment for all employees. If you are excited about the role but don't meet 100% of the requirements, we would still love to hear from you.