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Petr Kolonicz

Full-Stack Software Engineer

Web apps in Vue and TypeScript, and the AWS, Cloudflare and Linux infrastructure under them.

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About me

Petr Kolonicz. I started building websites at 14 and never really stopped. Today I work across the whole stack: interfaces in Vue, React and TypeScript, back ends in Node.js, and serverless infrastructure on AWS and Cloudflare. I set up and run my own Linux servers, and I like knowing what happens all the way down. From 2023 to 2025 I was CTO of Wecker, a startup making analytics software for e-commerce, where I led development, designed the architecture and the product, and ran the cloud side. As a contractor I have built and advised on multi-vendor marketplace platforms. I also run Webspen, a small web studio.

Have something to build? Write to me.

Petr Kolonicz

Experience

Bulkitrade, Inc.Developer consultantMarketplace platformOct – Dec 2025
Material Index LtdSoftware engineer, contractMarketplace platformSep – Nov 2025
WeckerCTOE-commerce analyticsJan 2023 – Dec 2025
FreelanceWeb developerWeb, brand, SEOSep 2022 – May 2025
JaSi PCIT technicianServers, CCTV, paymentsJan 2020 – Sep 2021

Work

Webspen

Webspen, webspen.com
Builds websites and web apps for clients, then hosts and looks after them.

Selin

Selin, selinapp.com
An analytics dashboard for Amazon sellers in Europe: profit, orders, returns and FBA stock in one place.

Bulkitrade

Bulkitrade, bulkitrade.com
B2B marketplace connecting food and beverage buyers with verified suppliers.Developer consultant, 2025

Material Index

Material Index, materialindex.com
A platform for reusing building materials: pre-deconstruction audits and a materials marketplace.Software engineer, contract, 2025

Projects and writing

Open source

Writing

mailgrep

Contact