Durable workflows · Real-time systems · Slot mathematics · BIM automation

I have 5+ years of commercial experience across gaming, marketplace SaaS, transportation and IoT. I build backend systems where state, concurrency, probability and failure handling need explicit contracts.

At Custom Games Studio, November 2023–July 2026, my work included:

• Approximately 15 game backends delivered from implementation to production.
• A shared C# / F# library used in 20+ titles, including probability composition, samplers, nested-feature execution and simulation infrastructure.
• 5,000+ RPS bet processing with duplicate-charge protection, and simulations of 1 billion+ spins across multiple machines.
• A 6× calculation speedup, reducing a simulation workload from three hours to 30 minutes through memory and allocation optimizations.

These are commercial results reported in my CVs and experience. The public projects below provide separate, inspectable engineering evidence.

Portfolio & game videos · LinkedIn · Email · Telegram · Technical reading guide

Nine Lives — new flagship: cat-Reaper collection, cluster cascades and a carried bonus multiplier.
Ancient Dragon — classic paylines, mystery symbols and free spins.
Woodland Whisper — interactive card picks and independently calculated expected return.
Le Militare — combat cascades, persistent multipliers and giant sticky WILDs.
X7 Club — locked coin prizes, Hold & Spin and column boosters.

Nine Lives · 1440p promo · LinkedIn edit · Original capture. Clean gameplay-and-music edit: 1440p / 60 FPS, rendered frame by frame through the unchanged game client using the recorded real API outcomes. No editorial text or game sound effects; original capture retained separately.

The showcase now includes all five games, with Nine Lives first. The source explains the RNG boundary, weighted samplers, payline trie, cluster BFS, bonus states, wager normalization and complete-round verification. Le Militare's verification uses held-out seed streams on the actual engine; Woodland additionally has a separate Python analytical reference. Test results, sampling estimates and analytical expectations are identified individually.

Watch the five-game promo · Read the mathematics · Review both X7 backend modes

The games currently run locally with an API; the portfolio hosts videos.

• C# + Go execution boundaries: Trading Systems Lab — order state, protobuf/gRPC contracts, PostgreSQL audit immutability and an independent emergency watchdog. 151 .NET tests passed, one optional benchmark skipped; Go watchdog tests passed.
• Python + LLM/media orchestration: Signal Processing Lab — async parsing, persisted campaigns, typed model output, dry-run execution and risk invariants. 340 offline tests; live-provider acceptance remains separate.
• BIM model integrity: ModelGuard — parameter contracts, transaction-safe mark updates and worksharing ownership. Shares AccessRoute's core/test suite; Revit-host execution remains unverified.
• Enterprise integration: MekashronTest — an older Umbraco / WCF / SOAP / SQL Server assignment.
• Earlier application work: Realtime Chat and StatsHub — SignalR, React, CQRS and caching, with narrower demo scope.

Headphones Battery for GNOME — precise Bluetooth LE battery level, remaining listening time from a per-device drain model learned by recursive Bayesian least squares, and a spring-animated Sims cat whose layers are redrawn only when their look changes. 36 gjs tests and public CI; tested with one headset model.	Dota Time for GNOME — counts time in Dota 2: live matches over Valve's Game State Integration, 60 days of OpenDota history, comparisons that set match clock against match clock until whole days are known, and a Fisher exact test before a win-rate gap is called real. 40 gjs tests and public CI; a live ranked match matched OpenDota to the second.	Psiphon Tunnel for GNOME — one ./install.sh sets up Psiphon's console client, pinned by sha256, with psi-on/psi-off and the extension. The country is picked in the popup or with psi region DE; an optional switch points GNOME's proxy at the tunnel and puts it back as it was. Psiphon runs in a systemd scope of its own, so a Shell crash cannot take the tunnel down, and before closing it the extension offers to wait for the programs still using it. 55 gjs tests against a fake Psiphon; CI runs the whole cycle in the headless Shells of GNOME 46, 48, 49, 50 and 51.

_{Rendered in throwaway headless GNOME Shells by each repository's capture script. The headphones numbers come from the real estimator; the Dota month and the programs in the tunnel are made up. The UI text is Russian.}

I use AI-assisted development with explicit constraints, architecture decisions, verification artifacts and final review. Architecture, acceptance decisions and engineering responsibility remain mine. I distinguish a passing contract test, a synthetic benchmark, a mathematical expectation and a commercial result.

Backend: C# / F# · .NET / ASP.NET Core · PostgreSQL / SQL Server · Redis · Kafka / RabbitMQ · outbox / idempotency · Docker · CI/CD
Across the stack: React / TypeScript · Blazor · Go · Python · Revit API · WPF/MVVM · probability models and deterministic simulation

_{Verification records span 2026-10-07–20; the linked reports define each suite's scope. Counts are not comparable project scores or production reliability guarantees.}