Staff-level frontend/system engineer based in Sweden. 20+ years experience shipping performance-critical, real-time, and composable interfaces in production. Previous work includes:

• Custom poker clients and in-house game engines (Gamesys, OpenBet)

• Embedded media platforms (Xperi/TiVo smart TVs)

• Large-scale e-commerce widgets (Stylitics, tens of millions of daily hits)

• LLM-assisted pipelines and tooling (CMS ingestion, visual diffing, media automation)

Strengths include UI architecture, latency-aware design, composable systems, fast iteration, and taking projects from prototype to production with minimal overhead.

Stack/tools: React, TypeScript, Web Components, Canvas/WebGL, ClojureScript Tauri, SQLite, Payload CMS, ffmpeg, Cloudflare Workers GitHub Actions, Playwright, Codex-based AI workflows

Recent personal projects:

• Socken : local-first genealogy tool (Tauri + SQLite + GEDCOM)

• Kolibri Club : cultural site with CMS, ingestion pipeline, and live video workflows

• grabfilm : Filmarkivet + Archive.org media archiver with idempotent metadata handling

Looking for small, focused teams working on tools, infrastructure, creative software, or low-latency systems. Open to consulting, contracting, or embedded long-term roles. Prefer high agency, low management overhead, and no hype-driven development.

Contact: jonatan.wallgren@gmail.com Site: https://www.kolibrinkpg.com