I've been worked in Form3 on the payments platform project. Where I designed and developed distributed system with strict requirements for performance, resilience and availability. I made stable performance for critical flow of the system with a load 1000 requests per second. Also I collaborated with different teams and shared my experience with improving system performance.

Also during work on the Form3 project I earned Kubernetes Developer Certificated (CKAD) to improve my skills and do my work better, because project highly relied on the Kubernetes platform.

I've been worked in Cowbell Cyber on the cyber security insurance platform project. Where I developed distributed system with complex business logic and refactored legacy services.

Also I introduced Java Code Style conventions, improved documentation and introduced integration tests.

I've been worked in Ajax Systems on Ukraine Air Alarm system just after Russian invasion in Ukraine on 24 February 2022. I was involved in the creation system architecture and development of the air strike alarm system for Ukraine during which I created and architecture, managed engineers and released the initial version of an application which saved a lot of life.

First production version of a project was released in 3 days from the start of a development from the scratch. It's instantly was used by a lot of people. This is one of the most popular apps (second or third place) in App Store in Ukraine.

I've been worked in Ajax Systems on Installation Business project. Clients required the ability to adjust equipment throughout mobile and desktop applications, my responsibility was to lead a cross platform team of 20 engineers and deliver software for iOS, Android, Windows and MacOs, I managed a team and successfully delivered new features.

This was project with strict requirements for high load and high availability. Counts of devices affected by this project is more than 100 000 devices.

I've been worked in Ajax Systems on Developer's infrastructure project. I worked as individual contributor I recognized that testing of a system in an isolation by developers is impossible for achieve.

After that I proposed an architecture for deploy full system infrastructure individually for each developer in AWS and implemented it, this decreased time to marked and increased system stability, because developers tested their features faster.

I've been worked in Ajax Systems on Pro Desktop project. During this project I developed microservices in Kotlin to handle desktop application requests where me with team implemented possibilities to audit, control and adjust hub devices for our clients.

Also first release of Pro Desktop (or 911 as we named it on that time) was done with our team and my first 6 months of work in a company. Also I was a part of "core team" which introduced DDD usage in a company and improved development planning.

I've been worked in OfferAI on Real Estate Platform. During this project I was a main developer in a startup on launch stage.

I developed Facebook Bot to sell properties and developed admin platform for real estate agents. Also I supported a production environment.

I've been worked in Orienteer on Business Application Platform. This was my first job where I was an one developer in a team. I collaborated with CTO and implemented different business modules and system modules.

One of the most important achievements here is user interface for data design and module system. All my contribution is available at GitHub, because originally Orineteer is an Open Source project.