Остап

Ostap Kernytskyi
.NET Developer
Email: [відкрити контакти](див. вище в блоці «контактна інформація») | Phone/Telegram: [відкрити контакти](див. вище в блоці «контактна інформація»)
LinkedIn: [відкрити контакти](див. вище в блоці «контактна інформація») | Location: Lviv, Ukraine | English: B2
PROFESSIONAL SUMMARY
Backend .NET developer with 5+ years of commercial experience building high-load, transactional systems for a large iGaming platform. Strong in microservice and event-driven architecture, REST API and service-to-service integration, and correct handling of financial transactions at scale. Solid foundation in OOP, SOLID, DRY and Clean Code, backed by unit/integration testing and thorough code reviews. Comfortable across SQL (MS SQL Server, EF Core) and NoSQL (Redis, Elasticsearch), with Docker and CI/CD in the delivery pipeline. Focused on performance, stability and long-term maintainability, and used to working in a cross-functional team.
TECHNICAL SKILLS
Core: .NET 8 / .NET Core, C#, ASP.NET Core, REST API
Engineering: OOP, SOLID, DRY, Clean Code, design patterns, code reviews
Architecture: Microservices, Event-Driven, distributed systems, high-load & transactional processing
Messaging / Event-Driven: RabbitMQ, Kafka, Pub/Sub, async service-to-service integration
Databases — SQL: MS SQL Server, Entity Framework Core
Databases — NoSQL: Redis, Elasticsearch
DevOps / Delivery: Docker, CI/CD pipelines, Git, Jira
Testing: Unit testing, Integration testing, TDD-friendly, Agile / Scrum
Observability: Grafana, New Relic, Kibana, execution monitors
Also: TypeScript / JavaScript, Angular; Python (automation / ML tooling)
PROFESSIONAL EXPERIENCE
.NET DeveloperNov 2020 – Present
EveryMatrix Ltd. — iGaming / Casino Platform (Lviv)
High-load, transactional, multi-service casino platform processing large volumes of financial transactions.
• Developed and maintained backend services on .NET / .NET Core within a microservice, event-driven architecture — building REST APIs and integrations between internal services and external partner APIs.
• Worked on high-load transactional processes — designed and maintained financial reconciliation services that compare transactional data across systems at scale, ensuring correctness, performance and stability under production load.
• Implemented event-driven, asynchronous communication using RabbitMQ and Kafka (pub/sub), with Redis for caching — for scalability and high availability.
• Used both SQL and NoSQL data stores: MS SQL Server with EF Core for relational/transactional data, and Redis / Elasticsearch for caching and fast search.
• Analysed and resolved defects and technical issues on a rotating incident-response duty (3-week shifts, working hours) — investigating SLA-bound production incidents (P1–P4) across all services with Grafana and New Relic, fixing root causes and feeding findings into prevention.
• Followed OOP, SOLID, DRY and Clean Code; covered code with unit and integration tests; took an active part in code reviews and team best-practices.
• Built an internal test-automation tool (TypeScript/Node + React, plus a Python ML/vision pipeline) that automatically validates partner API implementations against internal data.
• Collaborated in a cross-functional setup (developers, QA, DevOps) and communicated directly with external partner teams in English.
Stack: .NET / ASP.NET Core, C#, EF Core, MS SQL, Redis, Elasticsearch, Kafka, RabbitMQ, REST, Docker, CI/CD, Grafana, New Relic, Kibana, Git, Jira
Full-Stack .NET Developer2020
Whale — Cloud Video-Conferencing App (Binary Studio Academy, open-source)
• Delivered DB design (EF Core, MS SQL), real-time notifications (WebSockets + email), in-call chat (SignalR + Redis), and user analytics (Elasticsearch).
• Implemented user-status tracking, backend refactoring, and TypeScript/Angular frontend with form validation.
EDUCATION & TRAINING
• MSc, Computer Systems and Networks — Lviv Polytechnic National University (2021–2022)
• BSc, Software Engineering — Lviv Polytechnic National University (2017–2021)
• Binary Studio Academy — .NET (Graduated, 2020) · Sigma Software University — Agile Practice (2020)
LANGUAGES
Ukrainian — Native · English — Upper-Intermediate (B2) · Russian — Fluent