Vasyl Semiliak
Product Engineer
I like figuring out why something is slow, unreliable, or harder to work on than it should be—and doing something about it. Most of my experience is on the frontend, from complex interfaces to the systems and tooling behind them.
Lately, I’ve been spending a lot of time with AI: using it, trying things, and figuring out where it helps. That includes coding agents, harness engineering, and making those workflows useful for the teams I work with.
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Work
IndependentProduct Engineer · B2B
I work directly with founders and engineering teams to build and improve their products, and I’m open to new collaborations.
- I take ownership from the first technical questions to implementation and release, with clear communication along the way.
- I build complex interfaces and set up AI workflows that help teams implement, test, and debug their code.
- I’m especially interested in developer tools and AI products where I can help shape both how they work and how they feel to use.
CorelliumFrontend systems engineer
Led frontend modernization across a complex enterprise codebase, increasing team throughput, improving code quality, and making it AI-ready.
- Built the shared design system and migrated builds to Vite, cutting component development time by 40% and build times by 90%.
- Migrated to TypeScript, simplified state management, and standardized tooling to give developers and coding agents a more consistent codebase.
- Improved engineering workflows and how the team organized releases, making delivery more reliable.
AgenciesProduct Engineer
Shipped fintech and healthcare products, from MVPs to complex dashboards and integrations.
- Candis Led our frontend team and took responsibility for smooth engineering delivery.
- Akido Labs Helped launch and validate healthcare products, keep delivery on track, and improve engineering culture.
- TokenTax Owned the expansion of crypto exchange support and other integrations.
AXSYSFounding engineer
Built a startup’s first product from scratch, owning technical decisions and delivery.
- Worked across frontend, backend, integrations, and DevOps throughout a year of product development.
- Took responsibility for the product’s billing implementation.
- My first experience in product engineering taught me to connect technical decisions with product priorities.