# CV — Daniel Grossfeld > CV of Daniel “Klokie” Grossfeld — senior full-stack engineer and architect in Stockholm. TypeScript, Node, React, event-driven services, cloud. Senior full-stack engineer, architect and entrepreneur — Stockholm, Sweden. 27 years building for the web: complex data-driven products, e-commerce, media distribution, and regulated healthtech. Founding partner of four international companies, and a hands-on engineer throughout — I've led small, fast teams in New York, London, Paris, Barcelona and Stockholm, and I still write the code. Lately, two things. **I build with AI agents rather than just calling them** — MCP servers, always-on agent infrastructure, versioned skills and workflows — and I introduced that way of working to an engineering team, where the lesson was that it only holds once the shared rules and documentation exist. And **I build the interfaces that make large, structured data legible**: a Visx graphing library for longitudinal medical data, and before that a layout engine that composed magazine pages automatically using computer vision. Underneath both: TypeScript and Node, React and React Native, Python, event-driven services on Kafka and Postgres — plus the surrounding craft of making a platform survive its own history. I like owning a service end to end, and I like leaving a team faster than I found it. **Currently open to senior, lead and staff engineering roles** — remote-first or genuinely flexible hybrid, southern Stockholm or fully remote. [Get in touch](/contact/). ## Experience ### Werlabs — Full-Stack Developer _Stockholm, 2024 → present (consultant, then employee from February 2025)_ Health-tech platform for consumer blood testing, in a regulated Swedish environment. - Built and owned two production services end to end: an appointments and booking service integrating a third-party scheduling provider — entitlements, practitioner management, webhooks, Kafka events, booking and cancellation — which underpins the company's paid video consultations; and a TypeScript/Playwright PDF-generation microservice that replaced a fragile legacy JVM stack, with service-to-service auth, browser isolation, monitoring and an autoscaling path. - Shipped the infrastructure around them: webhook consumers, health-check coverage, structured logging, feature toggles and proportional rollout. - Held continuity for the legacy platform through several departures — identity and user profile, results, the practitioner app — including a handover to an external partner. - Introduced AI-assisted development to the team (editor tooling, shared rules, reusable skills) and onboarded a new developer through review and context transfer. - Built a dynamic graphing library on Airbnb's Visx that renders longitudinal medical data over time, used across consumer and B2B surfaces — large result sets, interactive time-series, and a component API other engineers build on. ### Scania — Elain Advanced — Product Owner / Senior Back-end _Stockholm, 2023–2024_ — data platform for a global truck manufacturer. **Python** serverless ingest APIs, SQL migration and modelling across GCP and AWS, owning both the backlog and the backend. ### TV4 / Telia / C More — Senior Full-stack Developer _Stockholm, 2022–2023_ — streaming and media distribution at national scale, across web and connected-TV clients. Editorial and content-delivery systems under real traffic, including PIN-code authentication and cross-domain consent handling. ### Sneakersnstuff — Senior Full-stack / Tech Lead _Stockholm, 2020–2022_ — led a small team building the **React Native** app (TypeScript, AWS, **Swift** for the native iOS layer) past **a million monthly active users**, multilingual and multinational across markets, languages and currencies. Migrated a large cross-platform codebase to TypeScript, integrated payment and logistics APIs, owned App Store and Play releases, and embedded a Unity game inside the app. ### Enliven — Co-founder & CTO _Stockholm, 2017–2024_ — AI-based media platform for professional creatives and premium personal brands. Raised 1 MSEK and built the whole stack myself — Node.js on MongoDB and MySQL with Docker, a REST API, a React front end — and the product itself: a design system that composed magazine-quality layouts dynamically using **computer vision**, years before the current AI boom. My partner and I personally signed over **250 journalists, photographers, stylists and chefs** from top-tier publications, who published on the platform from 2017 to 2022. When the consumer product stalled I productised the layout engine as a standalone API. ### Odalisque Magazine — Co-founder & Technical Director One of Sweden's leading fashion, arts and culture publications, in print and on the web. ### S2A Interactive — Founder Independent studio building modern web architecture for SMEs across European and US media and fashion. ### Surface to Air — Co-founder & CTO _New York / Paris, 2000–2008_ — design studio serving publishing, music, film and fashion. Earlier clients include MoMA, Tiffany & Co., Rawkus, Source, and New York Magazine. The longer list is on [things I've worked on](/work/). ## Building with agents Two years of building with AI agents rather than just calling them: - **Always-on agent infrastructure** on a self-hosted Linux box — scheduled and event-driven jobs, messaging and mail gateways, and a migration between agent runtimes with the integrations kept intact. - **MCP servers and tooling** for my own data and task systems, plus multi-host repo and state management across three machines — [repoman](https://github.com/klokie/repoman), written in **Go**. - **Agent skills and workflows** as reusable, versioned units. This is what I then introduced to the team at Werlabs, and the lesson was that adoption only holds once the shared rules and documentation exist — that is what makes agent output something a team will accept in review. ## Research and side work **Promobilia / KTH** — _2025 → present_ — assistive technology for deaf and hard-of-hearing users: real-time environmental sound recognition delivering haptic and visual feedback. **Unity** on iOS with an Apple Watch companion, on-device inference (YAMNet embeddings plus a trained classifier head, exported to **ONNX**), Core Haptics and a native WatchConnectivity plugin. Co-authored an ASSETS 2026 submission. **Kendra Foundation** — _London, 2009–2013_ — two EU FP7 research projects. EU liaison for SARACEN, authoring proposals accepted by the European Commission; and P2P-Next — peer-to-peer content delivery and adaptive streaming, 21 partners — as a senior back-end engineer. Distributed machine learning on a **Hadoop/Mahout** cluster with Python. **This site** — Astro, TypeScript and Cloudflare Workers: fully bilingual, with per-locale routing, translation fallback, canonical and hreflang policy, locale-aware structured data, edge delivery and a content pipeline that publishes from source on push. Where I try things before recommending them. ## Stack **Core:** TypeScript, Node.js, React, **React Native**, **Python**, Astro, Postgres, Kafka, REST and event-driven APIs, Playwright, Docker, CI/CD. **Cloud and delivery:** AWS, GCP, Cloudflare Workers, CDN and edge delivery, observability and structured logging, feature flagging and progressive rollout. **AI and agents:** LLM agent runtimes, MCP server design, agent skills and scheduling, retrieval over local corpora, computer vision, on-device inference (ONNX), distributed ML. **Mobile and realtime:** React Native, Swift, Unity (C#), Core Haptics. **Also:** **Go**, Keycloak and OIDC, i18n routing and content pipelines, data visualisation (Visx, D3). ## Education **Boston University** — _cum laude_, 1993–1998 B.S. Computer Systems Engineering · B.A. Music Theory and Composition ## Languages English (native), Swedish, Spanish, basic French. --- Full history on [LinkedIn](https://www.linkedin.com/in/klokie/) · [things I've worked on](/work/) · [get in touch](/contact/) --- Source: https://www.klokie.com/cv/ · Site index: https://www.klokie.com/llms.txt