I turn ambiguous problems into maintainable products — across fintech, AI, healthcare & crypto.
01 / About
I'm a Senior Frontend Engineer with experience building production-grade web and mobile applications across fintech, AI, legal, healthcare, and crypto.
I work at the intersection of engineering and product thinking. Stakeholders come to me with problems, not tickets — and I figure out what needs to be built, how to architect it, and how to make sure the team can sustain it long-term.
My focus is on maintainable code, clean abstractions, and delivering real product value — from component structure and state management to rendering strategies and monorepo organization.
02 / Stack
03 / Work
unplex
Jan 2025 — Present · Remote
Software Infrastructure, Software Design & more
Outsource Company
Sep 2023 — Dec 2024 · Ukraine · Remote
COAX Software
Jun 2022 — Aug 2023 · Ukraine
Freelance
Nov 2021 — Jun 2022 · Remote
04 / Writing
Deep dives on V8 internals, React rendering, and runtime behaviour — shared with 180+ followers on LinkedIn.
Node runs on one thread, fine until CPU-heavy work blocks it. Workers move that work to a real parallel thread — copy, transfer, or shared memory with Atomics. They don't speed up I/O; they exist for code that keeps the CPU busy.
Rendering is React calling your components in memory — the DOM has no idea. React builds a second tree, then commits all changes at once and swaps a single pointer. That's why it can pause, discard work, and restart without breaking the UI.
setState schedules an update with a priority Lane, scheduled via MessageChannel (not setTimeout). Render can be interrupted; commit runs to completion in one atomic swap. Once you see the three phases, the 2am bugs make sense.
V8 caches property access by object shape. Same shape stays monomorphic and fast; 5+ shapes go megamorphic and slow forever. Keep object shapes consistent and your hot functions stay fast — even when the code looks identical.
A 1M-token window doesn't mean a model uses 1M tokens well. Every frontier model degrades as input grows — often long before the window is full. Don't fill the window; spend the attention budget.
05 / Contact
“He has proven to be an excellent team member — independent, with a strong work ethic and a genuine eagerness to learn. Always ready to assist team members and collaborate effectively.”
“Working with Volodymyr was an absolute pleasure. His technical and problem-solving skills and sense of responsibility are at a high professional level. A skilled and collaborative developer.”
Have a problem worth solving? I'd love to hear about it.