IT product developer · fintech
IT product developer — from idea to production
I build IT products on .NET: payment integrations, backend and infrastructure. Four years of commercial experience and nine open-source SDKs.
About me
I build line-of-business systems where reliability, a clear architecture and careful integration with external services matter. I have hands-on experience maintaining legacy systems, migrating them onto a modern stack step by step, and putting in place the processes that make shipping safe.
I am most drawn to backend development, payment and social services, deployment infrastructure, business-process automation and practical open-source tooling for other developers.
Open-source .NET SDKs
MIT-licensed libraries that keep dependencies to a minimum. Just HttpClient and System.Text.Json, multi-targeting netstandard2.0 · net8.0 · net10.0.
.NET SDK for the YooKassa API v3
Payments, refunds, payouts and safe deals + webhooks — shipped as one package. Typed enums for every protocol value, idempotency and cursor pagination out of the box.
.NET SDK for T-Bank (Tinkoff) acquiring
Initialise payments, check status, confirm, cancel and refund, run QR/SBP operations and verify payment notifications. The SHA-256 token is computed locally and never travels as a request field.
Unofficial .NET SDK for T-Bank B2B QR (SBP)
Issue B2B payment links over SBP: one-time and reusable links, plus status and QR-image retrieval. Bearer token, X-Request-Id and a predictable error model.
Unofficial .NET SDK for T-Bank Junior (school cards)
Work with the Junior API: list school cards and manage schools (list, create, delete). Requires a GOST mTLS certificate alongside the Bearer token; predictable error model.
Unofficial .NET SDK for T-Bank Invoicing
Issue invoices (PDF + SBP QR) and track their status. Bearer token, X-Request-Id header, local validation and a predictable error model.
.NET SDK for ATOL Online cloud fiscalization
ATOL Online cloud fiscalization (possystem v4 service, FFD 1.05): authorization, sale / expense / refund receipts, correction receipts and fiscalization results. The token is cached for 24 hours.
.NET SDK for the Telegram Gateway API
Deliver verification codes (OTP) to users over Telegram — cheaper and more secure than SMS. Covers every documented Gateway API method plus delivery-report (webhook) signature validation.
.NET SDK for MTS Mobile ID (OIDC/OAuth2)
Server-initiated (CIBA) Mobile ID auth: a signed request object for si-authorize, JWKS publishing, SMS-OTP and notification handling, id_token validation, user data (premiuminfo) and verification (kyc-match-split). System.Text.Json is the only dependency.
RSQL/FIQL query-expression parser for .NET REST APIs
Parses query text into a typed AST with source spans and structured diagnostics. The core has no dependency on ASP.NET Core, LINQ or EF Core. A family of packages adds filtering, sorting, paging and OpenAPI documentation.
.NET SDK for the Yandex Metrika API
Goals, offline conversions (server-side revenue attribution) and reports. Fully stateless: the SDK never stores or refreshes tokens — your integration owns the lifecycle. OAuth 2.0 helpers are included, or bring a token you already have. Its only dependency is System.Text.Json.
Unofficial .NET SDK for Rocket.Chat
Find a user by username or email, open the private chat and post a message — in one call or step by step. Plus room history, unread counters, read/unread marks and custom emoji.
Typed .NET client for the School 21 API
Participants, projects (finished / in review), campuses and coalitions from the official School 21 public API — no third-party dependencies. The integrator owns auth (ROPC + refresh) and per-project participant lists filter by status. It powers the Pir2Pir product.
Flagship products
A user-verification platform: calls, SMS, voice, social apps and more — in one API.
A service for School 21 students: it finds a peer to review your project and a place to arrange it. Built on my School21Net SDK.
Work experience
Resident Card of Bashkortostan
January 2026 — present · now
Developing services and integrations for the “Resident Card” project: application features, backend services and production support.
Social Card of Bashkortostan
January 2023 — December 2024 · 2 years
Owned the evolution of the project’s services: maintained the legacy estate, designed integrations, grew the .NET 5/6 backend and drove infrastructure modernization.
UNIX POS terminals
August 2024 — October 2024 · 3 months
Built point-of-sale software for the NEW8210 UNIX POS terminal: school-canteen payments via MIFARE cards integrated with an external canteen API.
Payment gateway
June 2022 — February 2023 · 9 months
Built a payment gateway with a unified API for payment pre-processing, billing and integrations with acquirers and industry systems.
State education information system
December 2022 — January 2023 · 2 months
Temporarily led a team of 4 .NET developers on the state education information system and the Elschool e-diary.
FAForever Launcher
January 2022 — January 2023 · 1 year
Built a desktop launcher for the FAForever gaming community: real-time scenarios, network integrations and data visualization.
Projects
A user-verification platform: calls, SMS, voice, social apps and more — in one API.
A service for School 21 students: it finds a peer to review your project and gives you a place to arrange it.
An internet-privacy service: secure connectivity, traffic protection and easy access management.
A production payment gateway with a unified API, payment post-processing and acquirer/billing integrations.
A desktop launcher for a gaming community with real-time data exchange, API integrations and visualization.
Contact
Drop a short note about the task, timeline and context — I prefer direct, concrete communication.
or message me