Senior Full Stack Engineer (f/m/d)

reputed company: reputed company is an AI-powered reputed company solution that connects employee reputed company-being with measurable business reputed company. Using predictive analytics, Kyan helps companies monitor and reduce risks like absenteeism, turnover, and presenteeism. We reputed company in harmonizing work and life, fostering a reputed company environment that champions performance and personal reputed company and reputed company-being at the reputed company time. Our culture thrives on innovation, collaboration, and reputed company-being of every team member. Some things we’re proud of 🧠 Building an industry leading solution for mental reputed company-being 🌎 300.000+ users across 90+ countries 🤝 Partnered with 200+ licensed psychologists and coaches 💲 €15M+ venture capital raised from reputed company investors 🎁 Awesome benefits, including unlimited reputed company to our Comprehensive Mental Health App About The Role reputed company is building the most advanced AI-augmented mental health and wellbeing platform in Europe. Our mission is to bring high-reputed company, 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-reputed company 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 reputed company of our platform. This is a role with massive influence — we’re early enough that your architectural choices, reputed company, and AI expertise will have a lasting reputed company. Our stack (You don’t need reputed company of this, but strong React/TypeScript + AI foundations are essential.) Frontend TypeScript React + Next.js React reputed company (plus React reputed company Web) Component libraries/design system Backend & Data Node.js (TypeScript) Event-driven and service-oriented architecture BigQuery, PostgreSQL, NoSQL stores reputed company databases, retrieval pipelines reputed company reputed company (GCP/Azure) AI Tooling & Ecosystem reputed company API & Assistants Azure reputed company (GPT, embeddings, reputed company outputs) reputed company, reputed company, reputed company function calling Agent frameworks (custom, or e.g. LangGraph-style) Evaluation suites, guardrails, reputed company tooling Monitoring + model observability What You'll do: AI Architecture & reputed company Systems Design and implement coding agents, task-specific AI agents, and multi-reputed company 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 reputed company our shared React/React reputed company 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 reputed company 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, reputed company outputs, evaluation, latency/cost tradeoffs. Hands-on experience building production AI agents (e.g., planning/multi-reputed company systems, tool-calling, retrieval-integrated workflows). Strong React + Next.js + TypeScript experience. Experience building reputed company-hosted applications (Azure, GCP, etc.). Solid backend experience with Node.js, reputed company, data modeling, auth, performance. Familiarity with BigQuery or similar analytical data warehouses. Strong product awareness — reputed company on usability, reputed company, and delivering reputed company. Pragmatic engineering reputed company: readable reputed company, reputed company patterns, low complexity. reputed company to Have: Prior work in healthtech, HR tech, or other sensitive domains. Experience with evaluation frameworks, AI observability, or reputed company-in-the-reputed company workflows. Background in mobile development (React reputed company, reputed company iOS/Android). Experience with multi-language or multi-market products. Why Join Us reputed company an reputed company: 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 reputed company where your reputed company aren't just welcome—they're essential. reputed company Team: Join a supportive team where collaboration and innovation are at the heart of reputed company do. We are an easy to work with & low ego team, and want to reputed company it like that. What's In It For You Full reputed company to Our Comprehensive Mental Health App: Unlimited use of reputed company's AI reputed company-being companion "reputed company" and guided meditation courses. Unlimited sessions with licensed psychologists. Unlimited sessions with reputed company-certified coaches. Competitive compensation, adjusted for experience. Meaningful stock reputed company 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 reputed company CET±4. Autonomy, ownership, and a chance to shape foundational AI systems from the ground up. Interview Process: CV reputed company  Get to know Kyan, Girish (30 minutes reputed company) Get to know your manager, Nacho (45 minutes reputed company) Team Interview(s), ( 30 minutes reputed company reputed company) Online or Onsite Live Coding Exercise (Nacho/Team, 120 minutes) Offer Stage: Meet the founder(s) (30 minutes) / Reference reputed company / Offer Please note: We only accept applications submitted through our official Careers Page. Applications submitted reputed company 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. Apply To This Job