Hi, I'm
Olaf Koziara
Frontend Developer
Building scalable web applications with React and Angular. 3+ years of commercial experience, focused on performance and accessibility.
About Me
A bit more about who I am
Frontend developer with 3+ years of commercial experience, specializing in React and Angular. Additionally, I learn and use Node.js in projects, which allows me to collaborate effectively with backend teams and understand the full application lifecycle.
I've worked on applications for large organizations — from advanced form builders serving hundreds of users to responsive PWAs with Lighthouse scores of 95+. I deliver solutions that work, have clean code, and are pleasant to use.
I enjoy diving into application architecture, experimenting with new technologies, and sharing knowledge with others. If you're looking for someone who approaches projects with genuine commitment and isn't afraid of technical challenges — let's talk.
Business Projects
Enterprise and corporate implementations
FormBuilder for Internal CMS
Form-building tool integrated with the CMS platform. Panel built with Angular and TypeScript, integrated with Symfony/Twig backend.
CMS Theme and Components for PGE Group
Created a new theme and reusable component library for PGE Group's CMS. The project included unifying visual identity and streamlining content management processes.
PGE Newsletter (PWA / Offline-first)
Progressive Web App for internal newsletter distribution with offline-first architecture, Service Workers and performance-focused React implementation, achieving consistent Lighthouse scores of 95+ for performance and accessibility.
Featured Projects
My recent work
Orbitask manager
Task manager with real-time sync, drag & drop, and team collaboration features.
Angular finance
Finance management app with dashboard and data visualization.
Technologies
Tools I work with
TypeScript
JavaScript
Next.js
React
Angular
Node.js
Tailwind CSS
PostgreSQL
MongoDB
Git
Docker
AWS
Experience
My professional journey
Frontend Developer
SunGroup
Apr 2025 - Jul 2025
- Developed a library of reusable web components (PHP, JS, CSS) fully compliant with WCAG 2.2
- Library deployed across 100+ landing pages, ensuring visual consistency and accessibility
- Collaborated with UI/UX team on pixel-perfect interface implementations
Frontend Developer
PGE Systemy
Jul 2021 - Sep 2024
- Built web applications in React and Angular for Poland's largest energy company
- PWA Newsletter — implemented offline-first with Service Workers, achieving Lighthouse score 95+
- Financial Reporting App — built Next.js solution with GraphQL API handling 1000+ queries daily
- CMS Form Builder — designed dynamic form system with field dependencies, used across the entire capital group
- Core Theme — created reusable component library (TWIG/SASS/JS) for all PGE Group websites
Fullstack Developer
Freelance
Mar 2022 - Present
- Customization of Comarch B2B solutions — Angular frontend, C#/.NET/SQL backend
- Built WordPress and Next.js applications with payment gateway integrations
- SEO optimization for legacy websites — increased organic traffic by over 30%
- Workflow automation — osTicket plugin for ticket migration to Redmine