Senior Full Stack Engineer With Deep AI ExperienceKyan 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: AI agents & multi-step reasoning systems LLM application architectures Tool-calling, retrieval, orchestration, and evaluation 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 TypeScriptReact + Next.jsReact Native (plus React Native Web)Component libraries/design system Backend & Data Node.js (TypeScript)Event-driven and service-oriented architectureBigQuery, PostgreSQL, NoSQL storesVector databases, retrieval pipelinesCloud infra (GCP/Azure) AI Tooling & Ecosystem OpenAI API & AssistantsAzure OpenAI (GPT, embeddings, structured outputs)LangChain, LlamaIndex, OpenAI function callingAgent frameworks (custom, or e.g. LangGraph-style)Evaluation suites, guardrails, prompt toolingMonitoring + 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 processesInnovative 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 CheckGet 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 /