Available for select work · Dubai

Boring software.
On purpose.

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.

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001 — Ethos

Reliable things are quiet. The best software is the kind you forget is even there.

/ 01

Private by default

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.

/ 02

Built to last

Small, focused tools that do one thing and keep doing it. Predictable, maintained, and dependable for years — not just at launch.

/ 03

Quietly reliable

Infrastructure shouldn't be dramatic. Reassuringly boring means predictable behaviour and no surprises when it matters most.

002

Selected work

Platform · Web · D&D 5e

dnd.camp

«Твой штаб для D&D»
2014 + 2024 rules Builder & sheet Virtual tabletop RU · EN

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.

  • Builder, strictly by the rules — step-by-step creation for both the 2014 and 2024 rulesets; even the gnarliest multiclass builds stay legal and correct.
  • A sheet that plays along — concentration saves, conditions that change the math, buffs on you and your allies, sorcery points and metamagic, all automatic. Verified against D&D Beyond to the digit.
  • The whole table — a virtual tabletop with fog of war and tokens, an illustrated catalog and bestiary, plus campaigns, chronicles and a combat tracker.
  • AI in service of the game — a rules chatbot grounded in the encyclopedia, scenario generation, and automatic illustrations and translations.
dnd.camp
App · iOS / iPad / Mac

Boring Care

«Скука»
No account No server No tracking Universal app

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.

Days outside · rolling 365 0 / 183
  • Three counting rules — 183 days per rolling year, 180 consecutive days, or 183 per calendar year.
  • Reminders at 30, 14 and 7 days before your deadline — plus a one-tap return date for your calendar.
  • Home Screen widget with a live countdown, tracking up to three residencies at once.
  • Private by design — everything stays on your device. The App Store label reads “Data Not Collected”, and that's the truth.
App Store boring.care
Infrastructure · Self-hosted

ChakChak

«ЧакЧак»
AES-256-GCM Hash-chained audit SAML · LDAP · 2FA No cloud

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.

AES-256GCM envelope
530tests passing
0high·med findings
8/10OWASP Top-10
  • Envelope encryption — each secret is sealed with its own AES-256-GCM key and the master key never leaves your server. A stolen database is indistinguishable from random noise.
  • Tamper-proof audit — every action lands in a hash-chained log. Rewrite the past and the SHA-256 chain breaks, visibly.
  • Enterprise auth — SAML SSO, LDAP / Active Directory, or local login with two-factor. Per-credential TOTP, sudo-mode and idle-timeout built in.
  • Yours, end to end — folder-level access by AD group, a full REST API, KeePass and RatticDB import. No cloud version, by design.
Request access
003

The studio

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.

Registered entity
Legal name
Evgenii Koltsov
License
Sole Professional №101574
Authority
Dubai Development Authority
Activity
ICT Freelancer
Location
Dubai Internet City, UAE
D-U-N-S
57‑126‑0510

004 — Contact

Let's build something boring.

evgeny@koltsov.pro
Dubai Internet City · United Arab Emirates