Full Stack Engineer

Job: Full Stack Engineer (MERN Stack )Type: Full-time / Hybrid (3/2) Level: Mid-Senior Start date: Jan'26 Compensation: 30-45K€About Kincode AI Kincode AI is redefining how companies build, measure, and scale culture. We’re theCulture Copilot: an AI-powered platform that helps organizations transform culture through daily pulse insights, recognition, performance reviews, manager enablement, and proactive, AI-driven people intelligence.We recently won theHR Innovation Summit 2025 – Tendencias y Futuroaward, 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.This is not a “join and maintain tasks” role. This is afounding-team engineering seat. Your work will define the architecture, scalability, reliability, and user experience of the entire product.Why this role matters? You won’t be “one more engineer.” You will become theengineering backboneof a product used daily by thousands of employees across Slack, Teams, Google Chat, web, and mobile.You will own systems that manage: Daily culture data pipelines Advanced Pulse & Recognition analytics AI agents (KAI) with dynamic contexts Multi-channel notification infrastructure Our full React + Node.js + MongoDB platform Integrations with Microsoft, Google, Slack, HRIS, and moreThis is a rocket ship moment. We need someone who wants to build the engine.What you'll own Engineering: Build new features end-to-end acrossNode.js, Express, MongoDB, React.js and Tailwind. Strengthen and scale our architecture (microservices, queues, workers, caching, WIF, vector search). Ship high-quality code with tests (Jest/Mocha), monitoring, and clean documentation. Contribute to platform performance: caching, job schedulers, queue management (BullMQ), DB indexing.AI + Integrations: Implement and improve our OpenAI-based conversational agent and vector search RAG pipeline. Build integrations with Slack, Teams, Google Chat, and HR systems (Factorial, Personio, BambooHR, etc.).Product & Ownership: Work directly with the Founding team. Participate in decisions about architecture, product roadmap, and prioritization. Bring a mindset of shipping fast, learning constantly, and raising the bar.What we're looking for Must-haves: Solid experience buildingfull-stack apps(3–6+ years). Expert-level inNode.js/Express,MongoDB,React.js,TypeScriptis a plus. Experience with queues (BullMQ), background jobs, async processing. Comfortable designing MongoDB schemas & optimized aggregations. Understanding of security best practices (JWT, OAuth, WIF, CSP). High ownership: you think in terms of outcomes, not tickets. Startup energy: fast iterations, clean code, no drama.Nice-to-haves: Experience with OpenAI API / embeddings / RAG pipelines. Experience with Slack, MS Teams or Google Chat bots. iOS (Swift) exposure is a plus (not required). Infrastructure basics: Heroku, Vercel, Redis, GitHub Actions. Strong product intuition and user empathy.What we offer You will build systems from scratch and influence the entire architecture.No bureaucracy. You will ship daily. You’ll work across backend, frontend, AI, and integrations.We want you toact as a founder—so we compensate like one.Culture is the last unsolved frontier in HR Tech. We’re not another SaaS. We’re the firstCulture Copilotpowered by real-time AI.How we hire Phone Screen with CEO (CEO - Miguel ) Technical deep dive + portfolio review (CEO - Miguel) Architecture + problem-solving discussion (CEO - Miguel) Culture & ownership interview (COO - Juan) Offer