ABOUT US: Kyan Health is an AI-powered enterprise solution that connects employee well-being with measurable business impact. Using predictive analytics, Kyan helps companies monitor and reduce risks like absenteeism, turnover, and presenteeism. We believe in harmonizing work and life, fostering a positive environment that champions performance and personal growth and well-being at the same time. Our culture thrives on innovation, collaboration, and the well-being of every team member. SOME THINGS WE’RE PROUD OF * 🧠 Building an industry leading solution for mental well-being * 🌎 300.000+ users across 90+ countries * 🤝 Partnered with 200+ licensed psychologists and coaches * 💲 €15M+ venture capital raised from renowned investors * 🎁 Awesome benefits, including unlimited access to our Comprehensive Mental Health App About The Role Kyan Health is building the most advanced AI-augmented mental health and wellbeing platform in Europe. Our mission is to bring high-quality, clinically-grounded psychological support to employees and families across multiple countries, languages, and cultural contexts — with AI playing a central role. We are looking for a Senior Full Stack Engineer with deep AI experience, particularly in: 1. AI agents & multi-step reasoning systems 2. LLM application architectures 3. Tool-calling, retrieval, orchestration, and evaluation 4. Modern AI toolchains and best practices You will work closely with engineering, data, product, and clinical teams to build our AI features end-to-end and help shape the future of our platform. This is a role with massive influence — we’re early enough that your architectural choices, code, and AI expertise will have a lasting impact. Our stack (You don’t need all of this, but strong React/TypeScript + AI foundations are essential.) Frontend * TypeScript * React + Next.js * React Native (plus React Native Web) * Component libraries/design system Backend & Data * Node.js (TypeScript) * Event-driven and service-oriented architecture * BigQuery, PostgreSQL, NoSQL stores * Vector databases, retrieval pipelines * Cloud infra (GCP/Azure) AI Tooling & Ecosystem * OpenAI API & Assistants * Azure OpenAI (GPT, embeddings, structured outputs) * LangChain, LlamaIndex, OpenAI function calling * Agent frameworks (custom, or e.g. LangGraph-style) * Evaluation suites, guardrails, prompt tooling * Monitoring + model observability What You'll do: AI Architecture & Agentic Systems * Design and implement coding agents, task-specific AI agents, and multi-step workflows that power user-facing features. * Build and refine retrieval pipelines, embeddings flows, and hybrid RAG/logic systems. * Architect robust prompting, function-calling, and tool orchestration systems. Full Stack Product Development * Own features across Next.js, backend services, and mobile/web. * Translate product and clinical requirements into AI-powered user experiences. * Work with data pipelines, BigQuery, analytics, and experimentation frameworks. Cross-platform UI Systems * Build and evolve our shared React/React Native component library and design system. * Ensure accessibility, performance, and multi-market language support. Technical Leadership * Set coding standards for AI-integrated features. * Mentor others on AI architecture, LLM patterns, evaluation, and failures modes. * Challenge assumptions, propose better approaches, and push for pragmatic, responsible AI usage. Who We're Looking For Required: * Senior-level engineering experience, ideally 6+ years, with strong autonomy. * Deep understanding of the modern LLM ecosystem: models, embeddings, fine-tuning, structured outputs, evaluation, latency/cost tradeoffs. * Hands-on experience building production AI agents (e.g., planning/multi-step systems, tool-calling, retrieval-integrated workflows). * Strong React + Next.js + TypeScript experience. * Experience building cloud-hosted applications (Azure, GCP, etc.). * Solid backend experience with Node.js, APIs, data modeling, auth, performance. * Familiarity with BigQuery or similar analytical data warehouses. * Strong product awareness — focus on usability, clarity, and delivering outcomes. * Pragmatic engineering mindset: readable code, clear patterns, low complexity. Nice to Have: * Prior work in healthtech, HR tech, or other sensitive domains. * Experience with evaluation frameworks, AI observability, or human-in-the-loop workflows. * Background in mobile development (React Native, native iOS/Android). * Experience with multi-language or multi-market products. Why Join Us Make an Impact: Your work will directly contribute to improving mental health in workplaces around the world. Ownership: You'll have the chance to take ownership of our content production processes Innovative Environment: Work in a greenfield space where your ideas aren't just welcome—they're essential. Collaborative Team: Join a supportive team where collaboration and innovation are at the heart of what we do. We are an easy to work with & low ego team, and want to keep it like that. What's In It For You * Full Access to Our Comprehensive Mental Health App: * Unlimited use of Kyan Health's AI well-being companion "KAI" and guided meditation courses. * Unlimited sessions with licensed psychologists. * Unlimited sessions with ICF-certified coaches. * Competitive compensation, adjusted for experience. * Meaningful stock options in a rapidly growing AI-driven healthtech company. * Work with a mission-driven team and product that genuinely helps people. * Hybrid in Berlin or remote within CET±4. * Autonomy, ownership, and a chance to shape foundational AI systems from the ground up. Interview Process: * CV Check  * Get to know Kyan, Girish (30 minutes Call) * Get to know your manager, Nacho (45 minutes Call) * Team Interview(s), ( 30 minutes each call) * Online or Onsite Live Coding Exercise (Nacho/Team, 120 minutes) * Offer Stage: Meet the founder(s) (30 minutes) / Reference check / Offer Please note: We only accept applications submitted through our official Careers Page. Applications submitted via other channels will not be considered. 🤩We are excited to hear from you! ⛔Please note that we do not work with agencies or external recruiters.