• Cut intercontinental API latency by more than half (P95 630ms → <300ms) by diagnosing a TLS misconfiguration across the full request lifecycle. Upgraded to TLS 1.3, moved SSL offloading closer to the client, and removed a redundant CDN layer — owning the investigation, root cause analysis, and rollout end-to-end.

• Eliminated overselling during traffic surges in a high-throughput async e-commerce platform. Designed and implemented a stock reservation system to keep our catalog in sync with downstream platforms (Magento, WooCommerce, etc.) despite inherent race conditions. The next flash sale event resulted in zero oversells.

• Revived a legacy bot infrastructure used for catalog scraping and automated checkout. Identified a core design flaw in the scrape pipeline that, once fixed, cut processing time by 9× and reduced infrastructure costs proportionally. Reliability of the checkout bots improved 5–10× measured by incident frequency before and after.

• Led the design and implementation of end-to-end tests against a live external system — breaking the team's convention of mocking all third-party dependencies. The resulting test suite became a critical safety net, catching regressions before PRs merged and freeing the team to ship new features with confidence.

• Continuously improved developer experience through a steady stream of small, high-ROI changes. Dozens of targeted improvements to tooling, workflows, and feedback loops compounded over time into a meaningfully faster and less frustrating day-to-day for the whole team.

C# · Go · Typescript · AWS · Docker · PostgreSQL · MongoDB · OpenTelemetry · GitHub Actions

• .net core 5/3.1

• AWS (ECS, Lambda, S3, etc.)

• Docker

• MongoDB/Elasticsearch

• GitHub Actions

• ...and more (Scala, Go, Ruby)

Building embedded e-commerce experience to rule the world ;)

• .NET Core 2.2

• Angular 7

• Azure

• OAuth 2.0

• sucessfully introduced Integration Tests (SpecFlow based) in the project

• implemented Info Sec compliance in the project

• integration with Microsoft Graph API

• [more to come]

• mentoring, growth and development, onboarding new people

• overseeing project delivery: planning the work, delegating tasks in alignment with employee competences, securing capacity, cooperation with PM, BA, TA.

• working with client: understanding and supporting client’s strategic goals, technical support

• obviously still being a full stack developer among those tasks - most of the time

• Developing dedicated modern Web Application using Angular and TypeScript including writing non-trivial Angular components supported by directives to deal with complicated DOM interactions

• Extending CI/CD process which involves deployment in Azure (TeamCity/Octopus)

• Implementing various Azure Web Jobs to handle asynchronous processes triggered by Azure Queue

• Indexing data from SQL Server 2016 to Elasticsearch 5.x using various techniques (ie. Logstash, Azure Web Jobs) to be able to use full-text search throughout the application (including non-standard analyzers and tokenizers)

• Integrating Google Maps API and customizing it to perfectly fit application design, including drawing custom shapes, indexing them in Elasticsearch and then writing search queries based on geographical shapes

• Developing backend service using OWIN based Web API in CQRS manner (MediatR, Autofac, FluentValidation, Entity Framework 6, AutoMapper, etc.)

• Taking care of software quality using code reviews, unit testing, integration testing and few more on daily basis (xUnit, Moq, SpecFlow, PhantomJS and Jasmine for front-end)