ZentiumDev · Sri Lanka

Android apps, and the backends behind them.

I build and ship production Android software on my own — the app, the API, the admin panel and the server it runs on. Two case studies below, each written to show the decisions rather than the feature list.

Case studies Get in touch

Selected work

Two shipped products.

Lottery Sri Lanka home screen
Android · Ktor · PostgreSQL · Vue

Lanka Draw

Results and ticket checking for all sixteen NLB and DLB games. Camera scanning of a printed ticket, a configuration-driven prize engine, and Sinhala, Tamil and English throughout. Live on Google Play.

KotlinComposeCameraXML Kit KtorPostgreSQLVue 3

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 VaxAware Global family screen
Android · Offline-first

VaxAware Global

Vaccination schedules and reminders for a whole household, built on four published immunisation schedules. No account, no server, no analytics — every record stays in app-private storage on the device.

KotlinComposeRoomHilt WorkManagerAGP 9

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How I work

One person, the whole stack.

Both projects above were designed, built, deployed and published by me. That means the architecture decisions are mine to defend, and the case studies say what went wrong as well as what shipped — the interesting part of any of this is the problem that only showed up in production.

Mobile KotlinJetpack ComposeMaterial 3 RoomHiltWorkManagerCameraX Coroutines / Flow
Backend KtorSpring BootPostgreSQL Exposednginxsystemd
Web Vue 3ReactTailwind CSSVite
Ship Google PlayFirebase HostingDigitalOcean Cloudflare