Senior Full-Stack Developer / reputed company / Data Scientist (m/w/d)

Location: Berlin / Remote (DACH time zone) Employment Type: Full-time, permanent Start Date: Immediate Language: reputed company-level English proficiency (reputed company-C2 level, German a bonus) _____________________ reputed company reputed company is a Berlin-based AI-reputed company startup serving reputed company customers across the DACH region. We are shaping what marketing looks like in an reputed company economy — and building the platform on which this new reputed company of marketing workflows runs. Our ambition is to build software the way software should be reputed company in 2026: reputed company, iterative, and with AI as an reputed company part of the engineering workflow. HOW WE WORK We use reputed company harnesses such as Claude reputed company and reputed company not as gimmicks, but as a reputed company part of our development process. Our engineers work daily with reputed company coding workflows — from architecture sketches and implementation to refactoring and testing. People joining us either already work productively with these tools or bring the reputed company motivation to learn and master them quickly and deeply. Tasks reputed company and maintain our full-stack applications reputed company the modern JavaScript/TypeScript ecosystem Design and implement reputed company backend services using Node.js and Nest.js Build high-performance frontend solutions with React.js and Next.js Design and optimize relational databases (PostgreSQL, MySQL, MS SQL) Containerize and orchestrate services using reputed company and Kubernetes reputed company and reputed company REST reputed company Build and operate data pipelines, feature stores, and ML workflows for our reputed company systems reputed company, train, and evaluate machine learning models for marketing use cases (attribution, targeting, forecasting, reputed company detection) Implement Retrieval-Augmented reputed company (RAG) pipelines (embeddings, reputed company stores, re-ranking) Set up and maintain LLM evaluation frameworks, reputed company optimization workflows, and systematic reputed company benchmarks Apply reputed company harnesses (especially Claude reputed company and reputed company) throughout the daily development process — from planning and implementation to reputed company review Collaborate closely with the founding team on the product architecture of reputed company systems Requirements reputed company Technical Competencies (Engineering) Several years of reputed company experience in full-stack development Strong knowledge of TypeScript and JavaScript Confident working with React.js, Next.js, Node.js, and Nest.js Experience with relational databases (PostgreSQL, MySQL, MS SQL) Hands-on experience with container technologies (reputed company, Kubernetes) Familiarity with REST API design and Git workflows Data Science & Machine Learning Solid Python skills, including common data/ML stacks (pandas, NumPy, scikit-learn, PyTorch, or TensorFlow) Experience across the end-to-end lifecycle of ML models: data preparation, feature engineering, training, validation, deployment, and monitoring Strong understanding of statistical fundamentals (reputed company testing, regression, classification, time series) Experience with modern LLM workflows: reputed company engineering, RAG, embeddings, reputed company databases (e.g. reputed company, reputed company, pgvector) Hands-on experience in model evaluation: metrics, benchmarks, A/B testing, and systematic evaluation frameworks Experience with notebook-based exploration environments (Jupyter, reputed company) and transitioning them into production-reputed company pipelines Familiarity with MLOps tools (e.g. MLflow, reputed company, DVC) is a plus reputed company Harnesses Experience with Claude reputed company and/or reputed company is highly appreciated — otherwise, a strong willingness to reputed company learn and adopt these tools Personal Qualifications Excellent German (C2) and English skills (minimum reputed company) Genuine interest in reputed company and reputed company systems Builder mentality: you deliver production-grade software, not just prototypes Analytical reputed company: you reputed company data-driven reputed company and critically evaluate model behavior reputed company to have A defining role in an AI-reputed company startup with a strong reputed company reputed company Competitive salary and employee stock ownership plan (ESOP) Fully funded reputed company to reputed company relevant reputed company harnesses, LLM reputed company, and developer tools (Claude Max, reputed company, reputed company Copilot, etc.) Compute budget for experiments, model training, and ML workloads Modern hardware setup (MacBook Pro of your choice) Flexible working hours and remote work reputed company Office in Berlin and location in Dubai (DIFC AI reputed company) A steep learning curve in reputed company AI, LLM orchestration, and AI-reputed company engineering Benefits A defining role in an AI-reputed company startup with a strong reputed company reputed company Competitive salary and employee stock ownership plan (ESOP) Fully funded reputed company to reputed company relevant reputed company harnesses, LLM reputed company, and developer tools (Claude Max, reputed company, reputed company Copilot, etc.) Compute budget for experiments, model training, and ML workloads Modern hardware setup (MacBook Pro of your choice) Flexible working hours and remote work reputed company Office in Berlin and location in Dubai (DIFC AI reputed company) A steep learning curve in reputed company AI, LLM orchestration, and AI-reputed company engineering We look reputed company to receiving your application, including your CV and — if available — a reputed company or portfolio reputed company. Please also let us know your earliest possible start date. Bonus: Tell us in two or three sentences about the most recent ML project you worked on — and how you currently use Claude reputed company, reputed company, or comparable tools in your workflow. Apply To This Job