Bart Stefanski
Senior Frontend Developer at ZEN.COM
Warsaw, Masovian Voivodeship, Poland
Summary
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RockstarBart Stefanski is a Senior Frontend Developer with nine years of experience specializing in React, Next.js, TypeScript, web performance, and Vercel, currently building at ZEN.COM from Warsaw. He transitioned from a Java/Spring background into front-end engineering and has a track record of shipping high-impact projects—ranging from optimizing a news site serving 50M MAU (cutting bandwidth costs by 50%) to creating popular Next.js OSS starters that gathered thousands of GitHub stars. At Blazity he helped shape engineering culture, led technical hiring and pre-sales audits, and regularly advised leadership on tech strategy. He mentors teams on performance and architecture, drives DevRel through open-source work and technical content, and focuses on pragmatic, fast solutions that scale. A coder since age 12, Bart pairs deep practical experience with an eye for developer DX, tooling, and clean frontend architecture.
8 years of coding experience
4 years of employment as a software developer
Stackoverflow
21reputation
3kreached
3answers
2questions
Github Skills (17)
typescript10
nextjs10
styled-components10
typescript-types10
typescripts10
react10
eslint9
querydsl6
jpa6
mockito6
hibernate6
junit6
rest6
spring-security6
spring6
Programming languages (7)
Github contributions (5)
Blazity/next-saas-starter
Sep 2021 - Dec 2022
⚡️ Free Next.js responsive landing page template for SaaS products made using JAMStack architecture.
Role in this project:
Front-end Developer
Front-end DeveloperContributions:31 reviews, 115 commits, 137 PRs in 1 year 3 months
Contributions summary:Bart's contributions primarily focused on setting up and integrating front-end development tools and UI elements. They implemented styled-components for styling and configured ESLint. Furthermore, the user removed CSS modules and the index page, and implemented a desktop navbar. These actions suggest a strong focus on building and structuring the user interface of the Next.js application.
next-jstailwindcssjamstack-architecturemarketing-pagetemplate
bmstefanski/crud-commands
Mar 2018 - Jul 2020
Contributions:1 release, 1 PR, 16 pushes in 2 years 4 months
custom-commandannotationscli
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