Bartosz BuczkowskiProduct-Oriented Full-stack Developer
From idea to a finished app - without the technical chaos. I design and build modern web apps with product thinking, scalability, and rapid concept testing in the JavaScript ecosystem.
Tech stack
I build web products from first prototype to a stable production app. Below are the main tools I use every day to design interfaces, develop features, and keep applications running reliably for startups and product teams.
Experience
2026 - Present
Owner / Software Engineer
The Off
Building a business from scratch: branding, software development, and marketing.
- Branding
- NestJS
- Hasura
- Monorepo
2025 - 2026
JavaScript Engineer
Neti Soft
Secure business solutions including biometrics, encryption, and Web3 applications.
- JavaScript
- TypeScript
- React
- Next.js
- Web3
- Authentication
- Encryption
- Figma
- NestJS
- PostgreSQL
- Node.js
Selected projects
Kryptonim
Problem: The project required a secure cryptocurrency wallet enabling conversion to stablecoins, contact management, and convenient fund transfers.
Contribution: I co-built a React Native mobile app, developing wallet features and a security system based on PIN, biometrics, and a local Mongo Realm database. I also worked on app UX and secure cryptocurrency transfer handling.
2022 - 2025
Senior Frontend Engineer
Punkta
Frontend modernization initiatives, migrating legacy systems to React, stack unification, and UX consistency.
- React
- TypeScript
- Redux
- Material UI
- Rails
- Jest
- React Testing Library
- Monorepo
- JavaScript
Selected projects
Frontend stack modernization
Problem: The application ran AngularJS, Vue 1, React on Rails, Webpacker, and global CSS styles in parallel - difficult to maintain and scale.
Contribution: I participated in gradual legacy stack reduction and migration of existing business logic to an architecture based on React, SCSS Modules, and Material UI.
2021 - 2022
Frontend Engineer
Global4Net
React Native mobile applications and modernization of React apps with TypeScript and Redux.
- React
- React Native
- TypeScript
- Redux
- JavaScript
Selected projects
MyBenefit
Problem: An extensive platform required further development and gradual modernization of the frontend technology stack.
Contribution: I initiated TypeScript adoption in the existing codebase, supporting improved typing and application maintainability.
2021
Frontend Engineer
Europa Systems
My focus: scalable frontend architecture, component libraries, and performance optimization for large data-driven applications.
- React
- TypeScript
- Webpack
- Rollup
- Storybook
- Ant Design
- Monorepo
Selected projects
EDOCS Systems
Problem: The company was developing an advanced system for monitoring production-line processes, processing data from hundreds of devices and electrical receivers.
Contribution: I maintained the existing product and co-designed the architecture of a new version for deployment in clients' closed networks. I built the React frontend with a custom Webpack setup, co-created a Rollup-bundled component library documented in Storybook.
2020 - 2021
Junior Frontend Engineer
ReasonApps
Development of a browser-based graphic editor for sports journalists, e-commerce, and maintenance of React on Rails applications.
- JavaScript
- TypeScript
- React
- Next.js
- React Query
- Apollo
- GraphQL
- Styled Components
- Storybook
- Tailwind CSS
Selected projects
Brisk / Tisa Group
Problem: Sports journalists needed a tool to quickly generate and publish graphics based on live sports event data.
Contribution: I co-built an app for automatic graphic generation with Statscore API integration and delivered a Photoshop-inspired graphic editor. I took part in technical consultations and direct client collaboration.
2018 - 2020
Owner / Creative Graphic Designer
Lara’s Clothes
Running my own clothing brand: design, branding, e-commerce, logistics, and marketing.
- E-commerce
- Graphic Design
- Branding
- Marketing
Selected projects
Clothing brand and online store
Problem: A cohesive brand and online sales channel needed to be built from the ground up.
Contribution: I designed the brand's visual identity, launched a PrestaShop-based store, and handled sales and logistics.
FAQ
Everything you may want to know about working together, my approach, and how I help teams build and grow products.
I offer full-stack product development with React, TypeScript, and Next.js, legacy modernization, and AI-assisted engineering workflows. With 8+ years across 7 companies and 15+ shipped products - from Brisk and Legia.com to Kryptonim and Aertura - I take teams from MVP to production with CI/CD, SSR, and scalable architecture.
No - frontend is my core strength in React and TypeScript, but I also deliver backend APIs (NestJS, Node.js), GraphQL integrations, monorepo architecture, and product consulting. I work end-to-end across the JavaScript stack.
Yes. I regularly join existing codebases for incremental modernization, TypeScript migration, performance tuning, and faster feature delivery - without stopping live operations.
AI-supported development uses LLM tooling for research, debugging, prototyping, and boilerplate generation while keeping TypeScript strict mode, code review, and CI/CD quality gates. It shortens delivery cycles without sacrificing engineering standards.
Yes. I work with founders and early-stage teams that need fast MVP iteration, pragmatic architecture, and production-ready Next.js delivery - often remotely from Rzeszów, Poland across the EU.
Yes. I have migrated AngularJS, Vue 1, and React-on-Rails stacks to modern React, SCSS Modules, and TypeScript incrementally - reducing risk while keeping business features shipping.
Yes. Beyond implementation, I advise on frontend architecture, scalability, legacy modernization, AI workflows, and product strategy for teams building web applications.