Kosht
Live productPersonal finance that survives four currencies and a sole-trader tax year.
Next.js 16 · Supabase · Kotlin/Compose · Wear OS
Open the caseSystems in production, not landing pages.
Applications I built, shipped and still run myself, on one server I administer. Open the ones you can, read the rest.
CV
Live productTurns a resume into the version a specific job posting is actually asking for.
Next.js 16 · Supabase · LLM pipeline
Open the case
Papir
DownloadA desktop PDF workbench that replaced a paid one, and the phone version of it.
Tauri · Rust · TypeScript · Kotlin/Compose
Open the case
Ihor Kostyniuk
I build products end to end - the web app, the phone app and the server underneath. Everything on this page runs on one machine I administer myself: Docker, Postgres, Caddy, nightly backups, monitoring.
Web is Next.js and TypeScript, Android is Kotlin and Compose. Registered as a sole trader in Ukraine and open to contract work. Write in whichever language suits you.
Also built and running
All projectsThese stay behind the glass: screenshots, what the thing does and how it is used.
- ChatFour messengers and a website widget arriving in one operator window.Next.js 16
- MeetVideo calls on my own LiveKit, with the transcript and the decisions written up after.Next.js 16
- CoursesAsk a question, get the answer and the exact lesson timestamp it came from.Next.js 16
- RecruiterAn ATS that reads the pile of resumes before the recruiter does.Next.js 16
- SMMA daily posting pipeline that drafts, fact-checks and waits for one tap to publish.Kotlin/Compose
- OpsNine servers watched from one phone, with the routine repairs done without me.Kotlin/Compose
- FitMulti-tenant SaaS for gyms: schedule, memberships and the trainer side of it.Next.js 16