All case studies.
BlueVi
Long-running platform work on a Dutch occupational-health and absence-management (verzuim) SaaS used by employers, arbo services, and case managers.
Data-Exchange Portal
A data-exchange portal connecting a Dutch absence-management (verzuim) platform to external HR and payroll systems. It mapped each partner's incoming data into the canonical format our API accepted, migrating roughly 500 partners and exchanging object lists of 20,000 to 200,000 records per day.
Bioscape
A multi-tenant web platform where customers of a Dutch sustainability assessment organisation mark sites on a map, with a backend integration, built by my teammates, that connects to an external urban-planning simulation platform.
Tracker
A self-hosted issue tracker built to replace Linear once it hit its free-tier limit. Multiple projects, each with its own key and independent issue numbering, epics and sub-issues, a Kanban board, a token-authenticated API, and a command-line client that turns a new ticket straight into a ready-to-use git branch.
ID
A passwordless single sign-on server for the apps I run. People sign in once with an emailed code or a passkey, and every app trusts the same identity, with per-app access control and one-click launching from a portal.
Hablas
A language-learning app for Spanish and Portuguese built on CEFR pacing, comprehensible input and FSRS spaced repetition, with natural pre-generated speech and a deliberately honest view of your level instead of streaks.
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