Vladyslav Semenko
@vladyslavsemenko
Senior .NET engineer building scalable SaaS and production backends for finance and data.
PolandWhat I'm looking for
I’m a Senior .NET Engineer with 8+ years of experience building scalable backend systems and SaaS products in finance, analytics, and data-driven domains. I focus on performance, reliability, and business value using ASP.NET Core, Clean Architecture, and Domain-Driven Design.
Currently, I’m the Founder / Solo Developer of CodeCost, where I own the full product lifecycle—from architecture to monetization. I designed an end-to-end .NET 8 SaaS platform, built async background processing with real-time progress updates, and implemented code metrics (LOC, complexity, change frequency, bug-risk) with a feature-gated subscription model.
Previously, I’ve delivered production systems and full-stack products, including backend work for high-traffic banking services (500,000+ active users, 99.99% uptime) and data-driven applications with Blazor and Mapbox. Across roles, I’ve strengthened API design, refactoring, security (OAuth2/JWT), testing discipline (xUnit/NUnit/TDD), and performance tuning (including SQL optimization) to ship reliable releases.
Experience
Work history, roles, and key accomplishments
Founder / Solo Developer
CodeCost
Jan 2026 - Present (3 months)
Designed and built CodeCost, an end-to-end .NET 8 SaaS platform for code-debt and cost analysis, delivering real-time repository analysis pipelines and reporting dashboards. Implemented subscription gating with GitHub OAuth authentication and Stripe-ready billing infrastructure, owning architecture through deployment readiness.
Education
Degrees, certifications, and relevant coursework
PSTU, Mariupol Faculty of Information Technologies
Master's Degree with Honors, Computer Science
2017 - 2018
Completed a Master's Degree with Honors at PSTU in Mariupol from 2017 to 2018.
PSTU, Mariupol Faculty of Information Technologies
Bachelor's Degree in Computer Science, Computer Science
2013 - 2017
Earned a Bachelor's Degree in Computer Science at PSTU in Mariupol from 2013 to 2017.
Tech stack
Software and tools used professionally
Availability
Location
PolandAuthorized to work in
Job categories
Skills
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