I'm Anastasios Theodosiou. I build web applications with JavaScript and TypeScript, from frontend architecture and user interfaces to backend services, databases, and production deployment. My main specialization is Angular.
Based in Thessaloniki, Greece.
Products and tools built around real problems.
Certification practice platform
A better place to prepare.
A free study platform that turns question banks into focused practice, timed exams, and progress you can pick up from your phone or the couch. Available in English and Greek.
Booking platform
Bookings, without the back-and-forth.
Online bookings and appointment management for service professionals, brought together in one B2B SaaS platform.
Angular developer tooling
Translation work, preserved.
A command-line tool that keeps Angular's XLIFF files in sync while preserving translations, notes, and metadata.
A source file gains a new “Book appointment” message. The existing Greek translation and translator note stay intact.
<trans-unit id="welcome" approved="yes">
<source>Welcome</source>
<target>Καλώς ήρθατε</target>
<note>Keep the friendly tone.</note>
</trans-unit>Illustrative XLIFF 1.2 excerpt. Select “Show synced file” to compare.
A compound interest calculator that makes long-term growth easier to explore.
An exam preparation platform for marine engineers, with practice questions and progress tracking.
View the platformMy experience spans enterprise applications in banking, the public sector, and healthcare, alongside full-stack products and developer tools I build independently.
Senior Front-End Engineer
Senior Front-End Developer
Front-End Developer · Healthcare
Practical lessons from enterprise applications, independent products, and developer tools.
How a pile of GitHub question banks turned into Study Workspace, a free app for practising IT certifications from your phone or the couch, and the architecture behind it: Expo, NestJS, Prisma, Supabase and Docker.
How to stop breaking translations every time your app changes