Building things that ship | Engineer & Problem Solver

Resume

I build and deliver products that actually ship.
Efficiently and smartly.

I turn complex problems into simple, working solutions, focusing on systems that scale and actually get used. I think deeply, plan carefully, and execute relentlessly — leveraging modern tools and workflows to move faster without compromising quality.

Years of Shipping

13+ years architecting product-grade web apps— frontend-led, full-stack capable — from MVP to scale. Most recently Product Engineer at Exaforce ($75M Series A, AI security). Founding engineer at 2 startups. Open-source maintainer

Shipped excellence with:

From 3-person founding teams to Series C engineering orgs.

Each role taught me a different way to ship product under different constraints.

Open Source

Libraries and tools I've built and maintain. Born from real product constraints, refined across years of shipping, and open for the community to build on.

Pyreon

A 6 KB signal-based UI framework with fine-grained reactivity, no virtual DOM, full-stack runtime (SSR streaming, SSG, islands), 55+ packages, and JS Framework Benchmark performance 3.5× ahead of React.GitHub · Documentation

@pyreon/reactivity

Fine-grained reactive primitives

signal, computed, effect, batch, createStore, untrack — same shape as Solid/Svelte 5/Vue 3
Pointer-swap batching, lazy effect scopes, zero-allocation hot paths
Foundation of the entire 53-package ecosystem; every other lib subscribes to its contract

@pyreon/compiler

JSX-to-DOM compiler

Rust binary via napi-rs, 3.7–8.9× faster than the JS pass it falls back to
Signal auto-call, prop-derived const inlining, pure-call detection (40+ functions)
527 tests including 180 cross-backend equivalence tests (JS/Rust output parity)

@pyreon/router

Production-grade SPA + SSR router

View Transitions API integration, named typed routes, middleware chain, route guards
Loader cache with TTL + key-based dedup + SWR; redirect() and notFound() helpers
Prefetch on hover/focus/viewport, hash scrolling, error boundaries per route

@pyreon/zero

Full-stack meta-framework

File-system routing, SSR/SSG/ISR/SPA, API routes, server actions
Deployment adapters for Vercel, Cloudflare, Netlify, Bun, Node
AI-native: aiPlugin() generates llms.txt, JSON-LD, AI plugin manifest at build time

@pyreon/document

Same tree, 14+ output formats

PDF, DOCX, XLSX, PPTX, email, Markdown, Slack, Teams, Notion, Confluence, and more
Component tree authored once renders in-browser AND exports server-side
Heavy renderers lazy-loaded — pdfmake (3 MB), exceljs (1.1 MB) only on demand

@pyreon/lint

Framework-specific linter

62 rules across 12 categories (reactivity, JSX, SSR, hooks, accessibility, …)
Rust-powered via oxc-parser, AST cache, LSP server, watch mode, auto-fix
CLI + JSON-Schema config, four presets (recommended / strict / app / lib)

+47 more — reactivity, SSR, forms, query, table, charts, code editor, animations, design system, MCP, four compat layers (React/Preact/Vue/Solid)…

Vitus Labs

A modular React UI ecosystem (15 packages, ~75 KB gzipped total): engine-agnostic CSS-in-JS, chainable multi-dimensional theming (rocketstyle), unified web + React Native source, and a custom 10 KB CSS engine 158× faster than styled-components.GitHub · Documentation

@pyreon/styler

Custom CSS-in-JS engine, ~10 KB gzipped

React 19 native: <style precedence> SSR, useInsertionEffect client injection
Static/dynamic split with multi-tier caching — static templates compute their className once at module load
158× faster than styled-components at the styled() factory; 4.5× faster SSR throughput
Full surface: theming, @layer wrapping, automatic @media/@supports/@container splitting, specificity boost, keyframes, global styles

@pyreon/rocketstyle

Multi-dimensional component theming

Define a component as a matrix: size × variant × mode → every combination resolves automatically
Add `xl` to a size dimension and every existing variant gains it for free
Closest thing to a "headless variant system" with a real theming layer underneath
5+ years powering production design systems

@pyreon/attrs

Chainable component factory

Builder API: attrs({...}).attrs(callback).statics({...}).config({...})
No HOC pyramids, no forwardRef(memo(withTheme(...))) stacks
Merge order priorityAttrs → attrs → user props (last wins; priority locks security/correctness invariants like rel="noopener noreferrer")
Extension is the same operation as creation — attrs(Button).attrs({...}) produces a fresh Button with extra defaults

@pyreon/unistyle

Responsive styling engine

170+ CSS property mappings with three responsive formats (scalar, array, breakpoint-keyed object)
Mobile-first 5-stage pipeline: normalize → transform → dedupe → property-level delta diff → @media wrap
Delta diff collapsed a real production component's CSS from 21 declarations down to 11 — every property crosses the wire exactly once
Em-based media queries (respects user font-size accessibility settings)

@pyreon/kinetic

CSS-transition animation system

Transition, TransitionGroup, Stagger, Collapse — declarative, no virtual-DOM diffing of style values
No Framer Motion runtime, no AnimateSharedLayout overhead — pure CSS transitions wrapped in React components
65+ ready-made presets (fades, slides, scales, flips, etc.) plus factories for composing your own
Tree-shakeable — only what you import ships

@pyreon/rocketstories

Auto-generated Storybook coverage

Reads directly from rocketstyle dimension declarations — your component variants ARE the source of truth
One declaration produces a Sizes story, Variants story, States grid (hover/focus/active/disabled), full size × variant × mode matrix, and data-driven rows
Storybook stops being a thing you maintain and becomes a thing that's true
Add a variant → every dimension story gains it automatically

+21 more (connectors, primitives, hooks, grid, build tooling)

Favorite Tech Stack

I don't just follow trends — I chase what actually solves problems. Every tool here is battle-tested, continuously refined, and obsessively optimized for the work that matters.

…and many more I've collected along the way. Curious what caught my eye? Check out my Github stars to see what's pushing my thinking forward. Always learning. Always building.

Let's build something together

Work Experience

Delivered solutions for startups and enterprises. From building MVPs to scaling production systems, I've solved real problems at every stage.

Senior Product Engineer

Exaforce2024 - 2025 (contract)

US-based AI-powered security startup (Series A, $75M raised)
Built core analytics features. Worked directly with the CEO on what to ship next
Tuned SQL on a custom data layer to keep dashboards fast at real-time scale
Built customized frontend using Superset, React, TypeScript, Redux, Vite, TanStack Query/Table, Emotion CSS-in-JS
Implemented YAML-driven dashboard creation system

Tech Lead/Consultant

BOOTIQ2023 (contract)

Partnered directly with clients on business-critical technical challenges
Provided technical strategy and sales support for deal proposals
Conducted deep technical analyses and architecture recommendations for 20+ client projects
Designed scalable web application architectures and development workflows for starting projects
Resolved critical production issues for client projects
Evaluated team capabilities and defined growth strategies

Engineering Team/Tech Lead

KINDRED.2021 - 2022 (contract)

An agency delivering custom software solutions for big clients with portfolio of 100+ projects running concurrently
I led teams building everything from MVPs to production systems
Managed technical feasibility assessments and project estimation
Architected scalable web applications and optimized development workflows
Unblocked team members and removed technical barriers

Product Manager

Invity.io2021 (contract)

Product Manager at SatoshiLabs for Coinmap cryptocurrency location platform
Did a comprehensive market research and competitive analysis
Designed variants of business models and strategic roadmaps for C-level
Made data-driven recommendation to C-level resulting in strategic pivot
Identified critical risks and mitigation strategies
Collaborated on marketing materials and cross-department alignment
Recommended to close the product after thorough analysis of market conditions and internal capabilities

Founding Product Engineer

Cinnamon2019 - 2021 (contract)

Founding engineer at global social video platform with real-time crypto payouts
From zero to production
Architected complete monorepo structure with documentation and CI/CD workflows
Designed and built UI library using atomic design system patterns
Led feature development and major application initiatives
Managed cross-team collaboration with external agencies
Startup closed after 18 months due to market conditions exacerbated by the pandemic

Senior Frontend Engineer

Mews Systems2019 (contract)

Built features for B2C platform connecting hoteliers with customers
Designed and developed instant messaging feature from prototype to production
Contributed to shared UI library and platform packages
Systematically addressed technical debt and improved codebase quality
Contributed to code standards and best practices across the frontend team
Mentored junior engineers and guided team knowledge sharing
Engagement scope completed; messaging shipped and handed off

Education

Global education shaped my thinking. I studied in Czechia, Belgium and China — different cultures, different methods, different problems. That perspective is invaluable. Bachelor's degree, with real-world perspective.

Beihang University

Economics & Management2016

Gent Universiteit

Economics & Business Administration2013 - 2014

Czech Technical University

Economics & Management of Electrical Engineering2013 - 2016

Czech Technical University

Software Technology & Management2009 - 2013