Berlin, Germany

+49 176 84490877

drinchev@gmail.com

www.drinchev.com

Senior full-stack engineer with 20+ years building and shipping web applications at scale, from Yahoo! Mail (200M+ users) to bespoke AI products. The last three years focused on production LLM systems: RAG pipelines, AI agents and metadata optimisation. Comfortable leading teams, driving architecture and writing hands‑on code.

Senior AI Application Engineer

at CHAPTR

Built Reedy, an AI-powered metadata optimisation tool for books. As part of the AI innovation hub of the Holtzbrinck Publishing group, delivered multiple AI-driven PoCs and led internal hackathons and workshops.

Tech stack

Google Cloud, Langfuse, Langchain, OpenAI, Anthropic, Elastic Search, Firebase and others.

Senior Full-stack Engineer ( Freelance )

at Nexamind

Delivered tailor‑made AI solutions with measurable ROI for enterprise clients, including production RAG systems and a B2B, AI‑powered chatbot platform.

Tech stack

NextJS, Tailwind, React Server Components, Langfuse, Langchain, Langgraph, OpenAI, Azure

Senior Full-stack React/Node Engineer ( Freelance )

at Yahoo!

Led a team of six developers redesigning and modernising Yahoo! Mail (200M+ users), driving technical decisions, mentoring, reviewing pull requests and contributing hands‑on code.

Tech stack

ReactJS, NodeJS and others

Full-Stack Web Developer ( Freelance )

at Kieback & Peter

Built an IoT platform from scratch within cross-functional teams: applications, a shared UI library, end-to-end tests and Node.js / GraphQL backend services.

Tech stack

ReactJS, Azure DevOps, Azure Platform, GraphQL, oAuth, Material UI, NodeJS, JEST, Cypress, Terraform, Storybook, Apollo GraphQL

Front-end Web Developer ( Freelance )

at Hey Car

Built and maintained Hey Car alongside an internal UI library and tooling. Contributed to architectural decision records and ran front-end best-practice workshops.

Tech stack

ReactJS, Redux, SSR, GitHub, CircleCI, Kubernetes, Styled Components, NodeJS, React Router, Storybook, Cypress

Full-Stack Web Developer & team lead ( Freelance )

at OSRAM

Led the front-end team building and maintaining a React SPA, an open-source styleguide and UI library, and an open-source SDK for OSRAM's IoT platform.

Tech stack

ReactJS, BitBucket, Kubernetes, JIRA, ReactJS, CSS Modules, NodeJS, React Router, Styleguidist, JEST, Cypress, OpenAPI, PostCSS

Freelance Web Developer

20+ years building web sites and scalable full-stack applications, deploying across multiple clouds and delivering maintainable code. Also consulted on architecture, tech infrastructure, hiring and tutoring.

Notable Clients

Ninox, firma.de, Twago, Okonni, M-sense, Core SE

I've been contributing and maintaining open source projects, such as Mono Social Icons Font and Clief - CLI TypeScript framework. Check them out on my GitHub Profile