# Tuomas Hatakka Lead Full-Stack Developer · AI Engineer Vantaa, Finland · +358 40 534 6264 · tuomas.hatakka@gmail.com https://tuomashatakka.github.io · https://github.com/tuomashatakka · https://codepen.io/ndne · https://www.linkedin.com/in/tuomashatakka/ · https://www.npmjs.com/~tuomashatakka ## At a glance **Stack**: React 10 yrs · TypeScript 10 yrs · Node.js 10 yrs · PostgreSQL 10 yrs · GraphQL 10 yrs · Next.js 2 yrs · LLM & agentic AI 2 yrs **Experience**: 15 years professional web development, since 2011 **Work rights**: Finnish citizen (EU) — no visa or sponsorship required **Location**: Vantaa, Uusimaa, Finland — remote, hybrid, or on-site in Southern Finland **Availability**: Immediate **Languages**: Finnish (native) · English (fluent) · Swedish (fluent) · German (intermediate) ## Professional summary Lead full-stack developer and **AI-native engineer** with **15 years of experience** spanning front-end architecture, back-end systems, and production AI integration. Currently serving as **CTO**, leading technical strategy and platform development. Deep expertise in **TypeScript, React, Next.js** and **Node/Bun** runtimes, combined with hands-on LLM application engineering at the bleeding edge — **agentic workflows**, **Model Context Protocol (MCP) servers**, **retrieval-augmented generation (RAG)** pipelines, and multimodal document processing. Proven track record of **owning entire platforms end to end** — from design systems and accessible UI to database architecture, CI/CD, and cloud infrastructure. Works **directly with client stakeholders** rather than behind an account manager — requirements, demos and feedback first-hand, from organisations such as the veterinary group **Evidensia** and the **Finnish National Audiovisual Institute (KAVI)**. ## Core skills **AI & LLM engineering**: Claude Code (plugins & skills), Gemini CLI, OpenCode, Codex, Agentic workflows, Context engineering, MCP server development (FastMCP, incl. remote), RAG pipelines (embeddings, vector search, reranking), Vector databases (Qdrant), Vercel AI SDK, LangChain / LangGraph, Prompt & eval engineering, Function / tool calling, Multimodal document extraction, SSE / NDJSON streaming, Self-hosted inference (Ollama, llama.cpp, OpenAI-compatible endpoints) **Languages & runtimes**: TypeScript, ECMAScript, Bun, Node.js, Deno, Python, SQL, PHP, Kotlin (working knowledge), Nginx **Front-end**: React 19, Next.js 15/16 (App Router, RSC), React Native, HTML5, CSS3 / SCSS / Less / CSS modules, Design systems & design tokens, Responsive design, UI/UX design & interface prototyping (web and mobile), Accessibility (WCAG 2.1), Three.js / WebGL, Electron **Back-end & data**: PostgreSQL, MySQL, SQLite, MongoDB, Firebase, Supabase, GraphQL, REST APIs, Django & DRF, Express, WebSockets, Drizzle ORM, Multi-tenant architecture, Authentication & authorization (OAuth/SSO, token auth) **Cloud & infrastructure**: Vercel, Google Cloud Platform, AWS, Azure, Cloudflare, Docker & Docker Compose, Self-managed Linux VPS administration (Hetzner), Traefik + Let's Encrypt, MinIO, GitHub Actions CI/CD, Jenkins, DNS / SSL/TLS / CDN, Stripe payments **Tools**: zsh/bash, Git, Playwright, Jest, Jasmine, Vite, Turbopack, Webpack, ESLint (author of a published shared config) **Practice & delivery**: Git / Git Flow, Shell scripting, DevOps principles, Atlassian (Jira, Confluence), GDPR alignment, EU AI Act alignment, Direct client stakeholder communication ## Professional experience ### CTO & Principal Engineer — GlobalLegalCheck Oy Feb 2026 - present - Own the software architecture of an AI-native legal compliance verification platform end to end — system design, domain and data modelling, service boundaries and the deployment topology — alongside technical strategy and hands-on development as CTO and principal engineer. - Built the AI contract interpreter — clause extraction, risk scoring, key-date detection and missing-clause checks — cutting manual review time by approximately 70% via a private OpenAI-compatible inference endpoint and a Qdrant embedding and reranking pipeline. - Architected the platform on a single self-managed €10/month VPS running Docker Compose with fully automated deployment pipelines — Traefik and Let's Encrypt, PostgreSQL 16 with Drizzle, MinIO, a custom LLM backend, self-hosted Documenso e-signing and Umami analytics, and a frontend built with Next.js, TypeScript, and React Server Components — with zero AWS, GCP or Azure dependency. - Designed a multi-tenant, organisation-scoped data model with audit logging, OAuth/SSO (Google, Microsoft Entra), SSE-streamed analysis, and custom MCP servers for deployment and CMS tooling — GDPR- and EU AI Act-aligned by keeping inference and data on EU, self-hosted infrastructure. Technologies: Claude, Gemini, OpenAI, Mistral, Next.js, TypeScript, React Server Components, PostgreSQL, Drizzle, Qdrant, MinIO, Docker Compose, Traefik, Linux VPS ### Freelance Web Designer & Developer — Hummingbird Design (Tmi) Jan 2011 - present - Run an independent web design and development practice, continuously alongside employment — the studio behind the Hummingbird Design and MONO design systems, and the vehicle for all direct client delivery. - Between the Easywaste engagement and GlobalLegalCheck, worked in the practice full time — building a project-partitioned RAG system and Claude Code plugin, provisioning self-hosted LLM infrastructure, and developing the design systems since carried into production work. - Completed tens of website and web application projects end to end for clients including Suomen Talousverkko, Tuusulan seurakunta, Nurmijärven seurakunta, UP Suomi Oy, and Villa Tammikko. - Notable early deliveries include custom course enrollment software with live enrollment and multiple social media integrations, built with PHP, WordPress, Django, jQuery, MySQL, CSS, and HTML. Technologies: TypeScript, React, Next.js, CSS, Design systems, Three.js / WebGL, Electron, PHP, WordPress, Django ### Full-Stack Developer — Easywaste Oy & Freelancing Feb 2024 - Sep 2025 - Executed complete technical transformation of Easywaste's digital waste management platform over six months, starting as sole developer, migrating a legacy consultancy-maintained v1 system to a modern Next.js 14 architecture. - Built an AI-powered invoice analysis engine from the ground up: Google Gemini API multimodal document processing, Finnish Finvoice/Peppol XML parsing, and a custom OCR pipeline for automated waste-fraction categorization with intelligent weight and amount estimation — reducing manual data entry by approximately 80%. - Architected a 4-phase extraction pipeline covering core data extraction, dependent data handling, document hierarchy analysis, and asynchronous 14-row batch processing with NDJSON streaming for real-time progress updates, plus intelligent fallback detection driven by Finnish/English keyword mappings. - Developed enterprise-grade business logic: automated tendering with dynamic commission calculation (up to 25% algorithmic pricing), contract lifecycle management, equipment tracking, multi-tier subscription billing (€0–€24 per location), and CSRD compliance reporting. - Implemented the complete infrastructure stack: Next.js App Router with RSC, Supabase backend, Vercel deployment, GitHub Actions CI/CD, DNS configuration, and multi-tenant database architecture. - Delivered multiple AI-powered freelance applications featuring streaming multimodal LLM responses, function calling, and full cloud architecture using Next.js 15, React 19, and the Anthropic and OpenAI APIs. - Early adopter of agentic AI development tooling (Claude Code, Cline, Continue.dev, LangChain/LangGraph), significantly accelerating delivery velocity while maintaining code quality. Technologies: Next.js 14/15, React 19, TypeScript, Supabase, PostgreSQL, Google Gemini API, Anthropic Claude API, OpenAI API, LangChain, Vercel, Cloudflare, Docker, GitHub Actions ### Software Consultant — HiQ Finland Feb 2022 - Dec 2023 - Spearheaded front-end and back-end development on major international projects. - Contributed development and accessibility (WCAG 2.1) fixes to the Helsinki Design System — the City of Helsinki's open-source design system, named Best Design System at Grand One 2023. - Led front-end architecture on European-market projects serving over 100,000 users, and delivered solutions for multinational clients using React, TypeScript, GraphQL, and varied microservice backends — including Telia's microservice-based B2B webstore and HiQ's internal e-commerce platform. - Served in a lead architecture role, guiding teams toward scalable front-end solutions and lecturing regularly in internal front-end meetings. ### Front-End Developer — Nordhealth May 2016 - Jan 2022 - Led front-end architecture across healthcare triage products (Provet Cloud, Navisec Health, Viivi Health) for multinational clientele, reducing triage processing time by approximately 30% across five or more core medical products; every project included both front-end and back-end work. - Owned the application architecture on Navisec Health and Viivi Health — component and state architecture, API contracts against Django REST, and the real-time layer — shaping both products from requirements through to production. - Handled client communication first-hand — gathered requirements, demoed builds and took feedback straight from customers such as the veterinary group Evidensia and the Finnish National Audiovisual Institute (KAVI), with no account manager in between. - Built robust web and mobile applications with React, React Native, TypeScript, GraphQL, Redux, Django & Django REST, Node.js/Express, and PostgreSQL/MySQL — including a form builder tool, real-time WebSocket chat, and a Stripe-integrated reservation system. - Collaborated closely with cross-functional teams to ship high-quality, user-centric products on Google Cloud Platform. ## Selected projects ### Telia B2B E-Commerce — HiQ Finland Participated in the development of a microservice-based B2B webstore. Technologies: TypeScript, React, GraphQL ### Helsinki Design System — HiQ Finland Contributed development and bug fixes to the award-winning open-source design system, ensuring WCAG 2.1 compliance. Technologies: TypeScript, React, GraphQL ### Navisec Health — Nordhealth Owned the application architecture — component and state design, API contracts against Django REST, and the real-time layer — and implemented notable features including a form builder tool and WebSocket chat; back-end development with Django REST, PostgreSQL, and Google Cloud Platform. Technologies: React, Redux, Django REST, PostgreSQL, Google Cloud Platform ### Viivi Health — Nordhealth Owned the architecture of both the mobile and web applications for a veterinarian video reception triage service — shared domain model, API design and the booking flow — and implemented them, including a real-time reservation system with Stripe integration on Google Cloud Platform. Worked directly with the customer throughout: the adopting clinics, Evidensia among them, turning their reception workflows into product requirements. Technologies: React Native, React, Express, Stripe, Google Cloud Platform ### Provet Cloud — Nordhealth Contributed to agile development for multinational clientele as the company's first front-end developer, implementing a form builder tool and WebSocket chat on a multi-tenant architecture. Spoke directly with the clinics running the product, including the veterinary group Evidensia, gathering requirements and demoing releases to their staff. Technologies: React, Redux, Django, Django REST, PostgreSQL ### KAVI Elonet — Finnish National Audiovisual Institute Overhauled the Finnish National Audiovisual Institute's movie archive web application (elonet.fi), with a new UI and video streaming with captions. Worked directly with the customer throughout — agreed scope and interface decisions face to face with KAVI's archive staff as the institute's single point of contact. Technologies: PHP, Finna ### Project-Partitioned RAG System & Claude Code Plugin — Open source Designed and built a global, project-partitioned retrieval-augmented generation system packaged as a Claude Code plugin: FastMCP server, CLI, embedding index with cross-encoder reranking, browser-based viewer, and an automated test suite. Integrated into Claude Code, Claude Desktop, and OpenCode. Technologies: Python, FastMCP, Model Context Protocol, Embeddings & vector search, TypeScript ### Self-Hosted Autonomous AI Infrastructure — Personal infrastructure project Provisioned and operate self-hosted LLM infrastructure on Linux VPS and ARM64 cloud instances, including remote RAG SQL endpoints and an OpenAI-compatible local LLM query API. Technologies: Ollama, llama.cpp, Linux (Arch, ARM64), Node.js ### Design Systems & Creative Front-End — Ongoing Author and maintain personal design systems (Hummingbird Design, MONO) applied across web, Electron desktop, and Android (Jetpack Compose) applications — token architectures and hand-written CSS with zero utility-framework dependencies. An accessible, dependency-free date picker published on CodePen has been seen over 18,000 times and favourited 225 times. Built advanced WebGL/Three.js experiences including procedural 3D generation, vertex & fragment shaders, custom post-processing chains (depth of field, god rays, CRT), and real-time audio visualization with the Web Audio API. Publish and maintain the shared ESLint configuration @tuomashatakka/eslint-config on npm. Technologies: CSS, TypeScript, Three.js / WebGL, Electron, Jetpack Compose, Web Audio API ## Education Bachelor of Science in Electrical and Electronics Engineering, Aalto University, Espoo, Finland ## Languages Finnish (native) · English (fluent) · Swedish (fluent) · German (intermediate)