DM

Poznań, Poland

Dmitry Matveyev

Senior .NET engineer and tech lead. I spend my days pulling enterprise systems out of the past — and my evenings building small products for people who care about their animals.

Get in touch Download CV View CV online

About

Ten-plus years of hands-on .NET development, with a stretch of technical leadership in the middle. My specialty is legacy modernization: moving applications from .NET Framework to .NET 8, migrating databases, and breaking monoliths into services that can actually be deployed independently.

For the past year I've been folding LLMs into daily engineering work — Claude and Copilot, subagents, MCP servers — to move faster without letting code quality slide. I'm equally comfortable as an individual contributor and as the person responsible for a team.

On a personal note: I built EverPal after losing my cat to kidney disease, and while managing ongoing digestive issues with my current one. It's the kind of problem you only really understand once you've lived it at 3 a.m. with a notebook.

Selected work

Things I've shipped that moved a real number.

.NET 4.7 → .NET 8

Migrated an enterprise Web API layer

Auth (OWIN → ASP.NET Core), DI infrastructure, ORM, business logic and PDF operations. Eliminated ~15 legacy or deprecated dependencies and modernized the CI/CD pipelines along the way.

~350 GB

Of unused indexes removed

Cutting roughly 38.8M wasted reads per day. In the same production push: diagnosed a memory leak with a dump-comparison tool I built (root cause — an incorrect DI lifetime registration), and cleared a 21-month archival backlog of 1.5M records via batched deletion.

CosmosDB → MongoDB

Drove a platform migration

Initiated and led the move to reduce infrastructure costs and get out from under platform limitations we kept hitting.

5 → 9 engineers

Scaled and led a team

Hired three developers and a system architect, ran the technical interviews, and introduced Scrum — which cut estimation variance and gave stakeholders visibility they didn't have before.

Event-driven

Rebuilt logging on Azure Event Hubs

Replaced direct database logging with a centralized pipeline syncing to both cloud and on-premises databases, reducing infrastructure cost.

1+ year

AI-assisted delivery in production work

Integrating LLMs into everyday engineering: configured subagents, wired up MCP servers for routine tasks, and worked out which model to reach for when.

Side project · since May 2025

One tap to log what your pet just did. One page to show your vet.

When a pet is sick, the vet asks: how often, since when, what did it look like? Most owners guess. EverPal users tap one of six big buttons — poop, pee, vomit, food, meds, other — and hand over a dated list. Logging is free, needs no account, and works offline; the printable vet report is a one-time unlock.

The first version was a full-stack product I built solo: .NET 8 API, React 19, PostgreSQL, Firebase Auth, Stripe subscriptions, server-side PDFs. Then I rebuilt it as static files — no backend, no accounts, data in the browser — because logging has to start in zero seconds. Cutting it down was the harder engineering call.

Around it: privacy-first analytics (anonymous events, bot filtering) to measure activation and return rate, a free printable log as an SEO landing page, and Playwright end-to-end tests covering the paywall, offline mode, backups, the install prompt and service-worker updates.

Stack: Vanilla JS · installable PWA (offline service worker) · Stripe Payment Links · privacy-first PostHog analytics · Playwright E2E · Vercel

Visit everpal.app
EverPal on a phone: six one-tap buttons (poop, pee, vomit, food, meds, other) above a history grouped by day

Experience

  1. HiQo Solutions

    Jul 2023 — Present

    Senior Software Engineer

    Enterprise platform for regulated subscriber enrollment and compliance

    • Led the .NET Framework 4.7 → .NET 8 migration of the Web API layer, end to end.
    • Designed the event-driven logging architecture on Azure Event Hubs.
    • Resolved high-impact production performance issues — indexes, a memory leak, an archival backlog.
    • Revived an abandoned integration test suite and got it running in CI/CD.
    • Implemented email-based 2FA for the enrollment flow, from DB schema to feature flag.

    .NET 8 · ASP.NET Core · EF Core · Azure Event Hubs · Azure SQL · RabbitMQ · Azure DevOps · Copilot & Claude

  2. Geek-Solutions

    Nov 2022 — Jul 2023

    Senior Software Engineer

    Retail chain management system with hardware integration

    • Built features for a large-scale retail platform using Azure Service Bus for async messaging.
    • Contributed to architecture decisions for hardware-software integration.

    .NET Framework · SQL Server · Redis · Azure Service Bus

  3. Eon Games

    Aug 2020 — Oct 2022

    Development Team Lead (Sep 2021 — Oct 2022)

    Last Outlander — mobile game backend

    • Grew the team from 5 to 9 engineers and ran technical interviews.
    • Introduced Scrum; led the CosmosDB → MongoDB migration.
    • Split microservices into separate repositories for independent deployment.
    • Established a production monitoring rotation and incident response process.

    Senior Software Engineer (Aug 2020 — Aug 2021)

    • Architected the microservice communication layer — service SDK pattern and API contracts.
    • Migrated client-server communication from WebSocket RPC to REST.
    • Built the game configuration service that made rapid A/B iteration possible.

    .NET Core · MongoDB · Redis · Azure · Docker · Kubernetes · JMeter

  4. Exadel

    Nov 2018 — Aug 2020

    Senior Software Engineer

    Tax consulting platform — core infrastructure

    • Built infrastructure components and ran data migrations between system generations.
    • Profiling and optimization for high-load scenarios; team lead backup.

    .NET Core · SQL Server · MongoDB · Redis · Azure · Docker

  5. Intetics

    Jul 2018 — Oct 2018

    Senior Software Engineer — payment processing (IDT Corporation)

    Go microservices with gRPC for sensitive payment data, database migrations, SOAP integrations.

    Go · gRPC · Oracle · MongoDB · Docker

  6. Exadel

    Aug 2017 — Jul 2018

    Senior Software Engineer — e-470 toll road modernization

    Migration from a stored-procedure-heavy SQL Server implementation to a .NET-based SOA; established unit testing practice.

    ASP.NET Web API · Azure · SQL Server · Dapper · FluentMigrator

  7. Armada Labs

    Oct 2016 — Jun 2017

    Senior Software Engineer — Surefire, a mortgage CRM

    Migrated the codebase from .NET to Node.js, set up a Docker-based test environment on Linux, mentored juniors.

    ASP.NET Web API · Node.js · MySQL · Docker · JMeter

  8. Technikon

    Sep 2014 — Oct 2016

    Software Engineer → Senior Engineer / Team Lead

    Industrial automation: an enterprise information system for CNC machines, desktop apps and custom WPF controls with multi-database support. Promoted to lead — architecture decisions, technology choices, mentoring.

    ASP.NET Web API · WPF · SQL Server · Oracle · Entity Framework

  9. Invelio

    Nov 2013 — Sep 2014

    Junior Software Engineer — betting platform

    Betting terminal UI, indices calculation, stored procedure optimization.

    WPF · ASP.NET WebForms · WCF · SQL Server

Toolkit

Core 10+ years
C# · .NET (Framework / Core / 8) · ASP.NET Web API & MVC · SQL Server · Entity Framework
Strong 3+ years
Azure (Event Hubs, SQL, Blob, Service Bus) · MongoDB · Redis · Docker · WPF · Xamarin
Working knowledge
Go · Kotlin · Node.js · Kubernetes · gRPC · MySQL · Oracle
Architecture & practice
Microservices · Event-driven architecture · SOA · REST API design · CI/CD · Scrum · Performance optimization
AI-assisted development
Claude Code · GitHub Copilot · prompt engineering · agentic workflows · MCP servers · model selection

Other things I've built

Background

Education

Belarusian State University of Informatics and Radioelectronics
Bachelor in radioelectronics, medical electronics (2008) · Master in radiophysics (2009) · Researcher in radiophysics (2012)

IT Academy, Belarus — ASP.NET Developer (2013)

Languages

Russian — native
English — C1
Polish — A2

Get in touch

Open to interesting problems — especially the ones involving old systems that need to become new ones. Email is the fastest way to reach me.

dmitry.matveyev.job@gmail.com Download CV (PDF) View CV online