Jan Komínek is a Freelance Senior Frontend Engineer based in Prague, Czech Republic, specializing in Vue.js, React.js, TypeScript, and Node.js. Currently available for part-time B2B contracts up to 10 hours per week.
Jan
Komínek.
I build complex web applications from scratch — fast. Vue, React, TypeScript, Node. EV charging platforms, data-lineage tooling, and the infrastructure that holds it all together.
Building DeepTrace at CORAC Engineering
Data-provenance & integrity platform for Earth Observation data — D3.js lineage viz, client-side hash-chain verification, zero-trust auth with AWS Cognito.
Built end-to-end. Deployed. In production.
Every project below I shipped — infrastructure, backend, and UI.
◆ Flagship 2025SITH GUI (DeepTrace)
Client-side hash-chain verification, D3.js supply-chain graphs, and zero-trust auth for a sensitive EO data pipeline. 1yr+ ongoing, sole frontend engineer.
2025Scorecard
Cyber audit tool. NIS2 compliance, PDF export.
2024IONT charge
Public EV-charger payment gateway. ČSOB integration, Docker Swarm, Fastify + MongoDB.
2024IONT admin
Charger control panel with real-time firmware updates and station diagnostics.
2024IONT info
Public-facing EV charger info app.
2023Pangolin
Interactive analytics dashboard with complex data viz.
2024Noteful
Note-taking app with tag hierarchies & real-time sync.
2024Disenchantment
A minecraft plugin that enhances the vanilla enchanting system.
2025Portfolio v5
home.
2024Portfolio v4
home.
Senior ownership. No hand-holding required.
Part-time B2B engagements. I take full responsibility for the area I own — architecture, code, delivery, deployment.
Ship a new product from zero
You have an idea and a deadline. I set up the repo, pick the stack, design the data layer, ship the MVP, and deploy it to production. EV-charging platform went from 0 to public launch in 5 months.
Fix what's broken — fast
Flaky deploys, rotting codebase, missing CI, nobody knows how it works. I diagnose, stabilize, document, and set up the pipelines so your team can move again.
Grow the platform alongside the team
Ongoing fractional senior engineer. Code review, architecture decisions, mentoring juniors, owning the parts nobody else wants. Currently doing this for CORAC Engineering & Intedat.
Real feedback from real teammates and managers.
Pulled directly from LinkedIn recommendations — unedited.
"His problem-solving skills and experienced approach shined through. He is excellent at explaining tools and procedures to less experienced team members. Anyone would be lucky to have him."
"Jan's ability to tackle complex technical solutions and successfully overcome challenges was truly remarkable. He displayed not only technical expertise but also management skills — breaking work into smaller items so multiple team members could contribute seamlessly."
"Happy to recommend him for his amazing problem-solving skills and fast learning pace. He quickly picked up on new technology he hadn't used before and very quickly excelled at it."
"A versatile asset to any team. He consistently demonstrated his ability to turn project requirements into successful web applications. I wholeheartedly recommend Jan for his strong technical skills and commitment to delivering results."