Jan Kowalski

- Deliver full-stack solutions across AI, healthcare, and e-commerce - Built an AI chatbot with speech recognition (Next.js, Django, FastAPI), an analytics SaaS platform, and an e-commerce site (React, TypeScript, Nest.js) - Developed a Vue 3 + Laravel property-management SaaS - Gather requirements directly from clients and manage the full project lifecycle end to end

- Led full-stack development of AI and Web3 products for healthcare - Built an AI analytics dashboard, a patient-triage chatbot (Python, LLM APIs), and a Web3 dApp for health records - Architected back-end systems with Node.js, Express.js, Django, and Flask - Reduced API response times via caching and query optimization - Set up CI/CD on AWS, led code reviews, and mentored developers

- Developed fintech and trading apps with React, Next.js, and Angular - Built a crypto wallet, a trading platform with live market data, and a Web3 dApp connected to smart contracts - Engineered back-end APIs with Node.js, Express.js, Django, and Flask - Optimized real-time data handling to cut dashboard latency - Worked with product managers on requirements and mentored two junior developers

-Built front-end interfaces for healthcare and fitness platforms using React, Angular, and Vue.js -Developed a patient scheduling system and a fitness-tracking app with real-time dashboards -Engineered REST APIs and back-end services with Node.js, Express.js, Django, and Flask -Integrated third-party health and wearable APIs -Improved page load times through code optimization -Collaborated with designers and QA in an Agile team