Products that are live or in beta. Each one can be opened, installed or read in source.
A habit, goal, balance-wheel and journaling app I build and ship solo — end-to-end.
Solo: product, design and all three codebases — mobile, web and API — plus database, billing and ops.
Habit apps count streaks but ignore whether your life is actually in balance — and most fall over the moment you go offline.
Offline-first and multi-surface: a React Native app with a local SQLite mirror, a web app, and a Hono / Postgres API sharing one typed core.
Shipped to v2.8.11 with 2FA and multi-currency billing live — a life-balance wheel, day planner and journal on top of a real offline sync engine.
Sync wire format
{ entity, op, id, seq, version, row } This is what solo, end-to-end delivery looks like. If you need the same, let's talk.
prototype · open source · 2026
Turns a spare Mac into a real extra display for the main one, over Thunderbolt or Wi-Fi. Virtual display, ScreenCaptureKit capture and hardware HEVC/H.264 encoding run as one pipeline; PIN pairing uses CPace over TLS 1.3.
Hard part: Two independent protocol implementations, Swift and Rust, checked against shared conformance vectors.
beta · 2026
Mobile AI negotiation trainer. A behaviour engine keeps the counterpart’s hidden state — interest, trust, patience, positions — so the AI does not simply cave. The session runs on the device; catalogue and debrief work offline.
Hard part: Two-way quality gate: at most 2 caves in 10 attacks and at most 1 stubborn session in 6 honest ones, run by a test harness.
beta · 2026 · in Russian
Offline mobile sales and negotiation training game, built for a business trainer. Access is unlocked by signed QR passes; the app needs no server to check them.
Hard part: Passes are signed with Ed25519 and verified on the device; a Telegram bot with an allow-list issues them.
beta · 2025–2026 · in Russian
Economic board game with a web companion and online multiplayer. Client and server share one game engine.
Hard part: Balance simulations run as tests inside the game engine: playability and scenarios are checked on every change.
live · 2026 · in Russian
Negotiation training card game for business owners: web app, printable deck and offline Expo app. Each card carries Harvard-method fields — interests, BATNA, objective criteria.
Hard part: Two or three phones stay in sync without a network — by card number or QR code.
prototype · 2026 · in Russian
Kindness journal where each entry grows a personal tree. A Kindness Pass link or QR carries a good deed on to the next person, no signup needed. Backend, claim pages and a Telegram Mini App with a bot.
Hard part: Deed graph in Postgres on recursive CTEs, with an atomic claim-and-continue transaction.
Vereign AG · 2018–2025
Cross-platform mobile apps shipped to the App Store and Google Play; I owned the mobile side. A corporate Outlook plugin on Microsoft AppSource with a matching Chrome extension, and a Personal Data Wallet for self-sovereign identity with verifiable credentials.