My Work

A practice-management SaaS I build, deploy and run myself on a VPS. Every customer is a tenant, and one organisational model has to fit both a one-person practice and a medical group — without making the small customer pay for the large one's structure.

A Spring Boot reference architecture giving each tenant its own Postgres schema — where the connection provider deliberately does nothing, because Hibernate 7 already performs the switch itself.

Jobs submitted through a BFF, queued on Kafka, executed by a long-running Spark application and streamed back over SSE under one trace id — with the domain-specific surface narrowed to four extension points.

A read-only reader for a notes vault or a code repository — wikilinks, backlinks, search, and a faithful reimplementation of git's layered ignore semantics, pruning behaviour included.

An independently built Material-style UI kit — 35 components, 265 stories — where each component is its own Angular library and every style resolves through a three-tier token system rather than a hardcoded value.

Code generation, test scaffolding and documentation generators driven by Claude Code with custom agents and MCP integrations — judged on the quality of what they produce, not the volume.

Restructured the front end into an Nx monorepo of five applications on Ports and Adapters, so micro-frontends build and release independently.

Replaced raw text files as the way business users author domain rules: a from-scratch Lezer grammar, CodeMirror, and domain-aware autocomplete over their own schema.

Ended the duplicated components each team was maintaining — 23 shared Angular Material components, plus the contribution guidelines and versioning that made adoption stick.

Moved new services off an inherited Java monolith onto DDD and Hexagonal boundaries — writing the reference implementation and driving adoption through pairing sessions.

The module where automation processes are composed visually and configured per task, replacing hand-coded process definitions.

Onboarding by pairing people through the architecture rather than handing them documentation. Four engineers to date.

Keycloak as the authentication server for the suite — full OAuth2/OIDC lifecycle for hundreds of users across five tenants, with a custom token mapper carrying tenancy.

Seven modules off end-of-life AngularJS over 18 months, both frameworks live behind a bridge so feature delivery never paused.

Real-time energy dashboards for UPS-backed data centres, with facility- and device-level drill-down kept consistent under continuous streams by NgRx.

Energy and photovoltaic monitoring across EMEA, plus BLE control of lights and shutters from a web app on Android and iOS — where a device is only ever probably in a state.

An EU research project projecting 3D designs onto printed models in real time, with ActiveMQ holding a Java web stack and a C# projection loop apart.