PbJob /b: Full Stack Engineer (MERN Stack) /ppbType /b: Full-time / Hybrid (3/2) /ppbLevel /b: Mid-Senior /ppbStart date /b: Jan'26 /ppbCompensation /b: 30-45K€ /ppbr/ppbAbout Kincode AI /b /ppKincode AI is redefining how companies build, measure, and scale culture. /ppWe’re the bCulture Copilot /b: an AI-powered platform that helps organizations transform culture through daily pulse insights, recognition, performance reviews, manager enablement, and proactive, AI-driven people intelligence. /ppbr/ppWe recently won the bHR Innovation Summit 2025 – Tendencias y Futuro /b award, competing against more than 150 companies. We’re now moving from early adopters to fast-growth, and we’re hiring our first full-stack engineer to join the founding team. /ppbr/ppThis is not a “join and maintain tasks” role. /ppThis is a bfounding-team engineering seat /b. Your work will define the architecture, scalability, reliability, and user experience of the entire product. /ppbr/ppbWhy this role matters? /b /ppYou won’t be “one more engineer.” /ppYou will become the bengineering backbone /b of a product used daily by thousands of employees across Slack, Teams, Google Chat, web, and mobile. /ppbr/ppYou will own systems that manage: /pulliDaily culture data pipelines /liliAdvanced Pulse Recognition analytics /liliAI agents (KAI) with dynamic contexts /liliMulti-channel notification infrastructure /liliOur full React + Node.js + MongoDB platform /liliIntegrations with Microsoft, Google, Slack, HRIS, and more /li /ulpbr/ppThis is a rocket ship moment. /ppWe need someone who wants to build the engine. /ppbr/ppbWhat you'll own /b /ppEngineering: /pulliBuild new features end-to-end across bNode.js, Express, MongoDB, React.js and Tailwind /b. /liliStrengthen and scale our architecture (microservices, queues, workers, caching, WIF, vector search). /liliShip high-quality code with tests (Jest/Mocha), monitoring, and clean documentation. /liliContribute to platform performance: caching, job schedulers, queue management (BullMQ), DB indexing. /li /ulpbr/ppAI + Integrations: /pulliImplement and improve our OpenAI-based conversational agent and vector search RAG pipeline. /liliBuild integrations with Slack, Teams, Google Chat, and HR systems (Factorial, Personio, BambooHR, etc.). /li /ulpbr/ppProduct Ownership: /pulliWork directly with the Founding team. /liliParticipate in decisions about architecture, product roadmap, and prioritization. /liliBring a mindset of shipping fast, learning constantly, and raising the bar. /li /ulpbr/ppbWhat we're looking for /b /ppMust-haves: /pulliSolid experience building bfull-stack apps /b (3–6+ years). /liliExpert-level in bNode.js/Express /b, bMongoDB /b, bReact.js /b, bTypeScript /b is a plus. /liliExperience with queues (BullMQ), background jobs, async processing. /liliComfortable designing MongoDB schemas optimized aggregations. /liliUnderstanding of security best practices (JWT, OAuth, WIF, CSP). /liliHigh ownership: you think in terms of outcomes, not tickets. /liliStartup energy: fast iterations, clean code, no drama. /li /ulpbr/ppNice-to-haves: /pulliExperience with OpenAI API / embeddings / RAG pipelines. /liliExperience with Slack, MS Teams or Google Chat bots. /liliiOS (Swift) exposure is a plus (not required). /liliInfrastructure basics: Heroku, Vercel, Redis, GitHub Actions. /liliStrong product intuition and user empathy. /li /ulpbr/ppbWhat we offer /b /ppYou will build systems from scratch and influence the entire architecture. /ppbr/ppNo bureaucracy. You will ship daily. /ppYou’ll work across backend, frontend, AI, and integrations. /ppbr/ppWe want you to bact as a founder /b—so we compensate like one. /ppbr/ppCulture is the last unsolved frontier in HR Tech. /ppWe’re not another SaaS. /ppWe’re the first bCulture Copilot /b powered by real-time AI. /ppbr/ppbHow we hire /b /pulliPhone Screen with CEO (CEO - Miguel) /liliTechnical deep dive + portfolio review (CEO - Miguel) /liliArchitecture + problem-solving discussion (CEO - Miguel) /liliCulture ownership interview (COO - Juan) /liliOffer /li /ulpbr/p