I'm Evgenii Koltsov — an independent developer building apps, platforms and infrastructure that get the details exactly right and quietly, dependably work. Private by default. Correct to the last digit. No drama.
001 — Ethos
Reliable things are quiet. The best software is the kind you forget is even there.
Your data stays on your device — or on your own server, under your own keys. No accounts you didn't ask for, no analytics, no tracking.
Small, focused tools that do one thing and keep doing it. Predictable, maintained, and dependable for years — not just at launch.
Infrastructure shouldn't be dramatic. Reassuringly boring means predictable behaviour and no surprises when it matters most.
A complete platform for Dungeons & Dragons 5th edition — a character builder and interactive sheet that outdo D&D Beyond, wrapped around a living rules encyclopedia, a virtual tabletop and campaign chronicles. In Russian and English.
A quiet day-counter for people with a residency permit. It counts how many days you've spent outside your country and reminds you when it's time to return — and nothing ever leaves your device.
An enterprise password manager with grown-up cryptography and an audit log that sends nothing outside. Self-hosted, no subscriptions, no third-party services — a from-scratch successor to RatticDB on a modern stack.
Evgenii Koltsov is an independent software developer based in Dubai Internet City. Licensed by the Dubai Development Authority as an ICT freelancer — web, mobile, and software development and architecture — he designs and ships privacy-first products end to end.
One person, fully accountable: from the first sketch to the last line of code to the version you run today. If it carries the Koltsov name, it was built to be dependable — and to stay that way.
004 — Contact