01520nm Systems
Watchman
Real-time system health monitor.
Shipped · 2026
Available for Outside IR35 & C2C contracts
Enric Trillo
Fullstack Product Engineer · London, UK
Production software, end to end.
Nine years building and shipping on TypeScript, Next.js and Python — with Azure and AI as part of the toolkit, not a separate department. I take features from product decision to production across the full stack, with no handoffs between specialists along the way.
Product Engineering
Owning a feature from product decision through to what ships.
UX/UI Design
Interface and interaction decisions made in code, not handed off.
System Design
Architecture and data decisions that hold up under real load.
Cloud Infra
Deploys, CI/CD and infra-as-code — Azure-first.
Applied AI
LLM APIs and agentic workflows wired into production systems.
- 405nmIntelligenceModels, agents and AI engineeringNo posts yet
- 470nmComputeInfrastructure, deploys and hardwareNo posts yet
- 520nmSystemsArchitecture, backend and dataNo posts yet
- 590nmInterfaceProduct thinking and frontendNo posts yet
Selected work
4 projects
- 02590nm Interface
Minima
A Tailwind v4 theme for interfaces that stay out of their own way — neutral carries the structure, colour is spent on state, identity and data. Every rule ships with the runner that proves it.
- Tailwind v4
- OKLCH
- shadcn registry
In build · 2026 - 03590nm Interface
Ruskel
A design system with decisions in it, not just components — one spectrum solved against contrast windows, two exposures, and a rule for which value belongs where.
- CSS
- OKLCH
- shadcn
- npm
- 04470nm Compute
supasteeltokens
npm package for token encryption, rebuilt from scratch in v2.0.0 around proper AES-256-GCM.
- TypeScript
- Node
- npm
Shipped · 2026
Toolkit
Filed by band
- Interface590nm
- TypeScriptReactNext.jsTailwind
- Systems520nm
- NodePythonPostgreSQLREST APIs
- Compute470nm
- AzureVercelDockerCI/CD
- Intelligence405nm
- LLM APIsAgents & tool useRAGEvals
Now
- Building depth in Azure, with AWS returning to the toolkit down the line.
About
I’m Enric Trillo, a fullstack product engineer based in London, UK, working through Metasyde.
I build and ship production software end to end: product thinking through frontend, backend, cloud and AI. In practice that’s TypeScript and Next.js on the front, Python and Node behind it, Azure underneath, and AI work layered through the middle — part of the toolkit rather than a separate specialism.
- Sectors
- Fintech, e-commerce, dev tools
- Team size
- 2–8 engineers
- Notice period
- 2 weeks