Piotr Ojrzyński
Verified Expert in Engineering
Software Developer
Wrocław, Poland
Toptal member since December 16, 2015
Piotr is a Senior Software Engineer and Consultant with 12+ years of experience delivering scalable web platforms for international clients across logistics, fintech, media, and SaaS. He specializes in React, TypeScript, and real-time systems. Experienced as an independent contractor (B2B) on fully remote, distributed teams, Piotr focuses on performance optimization, clean architecture, and business-driven feature delivery.
Portfolio
Experience
- JavaScript - 11 years
- React - 9 years
- Figma - 7 years
- TypeScript - 6 years
- Redux-Saga - 2 years
- ECMAScript (ES6) - 2 years
- Redux - 2 years
- Socket.IO - 1 year
Preferred Environment
Git, MacOS, React
The most amazing...
...thing I've built from scratch is TheTypingCat, and seeing millions of users engage with it remains my proudest achievement.
Work Experience
Senior Front-end Developer
D5 Labs Inc
- Optimized front-end performance in Next.js applications, improving load times and responsiveness across low-end devices through code splitting, lazy loading, and rendering optimizations.
- Refactored and scaled complex TypeScript-based front ends using modern React patterns, improving maintainability, performance, and overall user experience.
- Identified and resolved performance bottlenecks in data-heavy applications, including optimizing state management with Zustand to reduce unnecessary re-renders and improve rendering efficiency across devices.
Senior Software Engineer
Agility
- Identified and resolved critical performance bottlenecks, achieving faster page load times and more reliable handling of high traffic volumes, supporting business growth and scalability.
- Developed and deployed new features, including automated shipping rate calculations and integration with 3rd-party carriers, reducing manual operations and increasing platform efficiency.
- Designed and implemented enhancements to the shipping quote platform, improving response times and user experience, resulting in increased customer engagement and higher quote conversion rates.
React/Redux Developer
Entwicklungspark AG
- Developed a platform for online TV aimed at the Swiss market, Wilmaa.com.
- Tracked, prioritized, and resolved bugs via Jira, improving overall platform stability and user experience.
- Delivered new features for live TV and time-shifted playback, enhancing viewer engagement and platform usability.
Software Engineer
Enclaves.io
- Created the architecture and developed the system for a digital asset exchange.
- Led the development of the trading engine and user-facing platform features, enabling efficient order matching, real-time portfolio tracking, and secure asset management.
- Created the end-to-end system architecture for a digital asset exchange, ensuring high availability, security, and seamless transaction processing for a growing user base.
Senior JavaScript Developer
Matchbyte Consultants
- Developed an interactive real-time configurable booking engine system.
Senior JavaScript Developer
Nicho
- Created and developed a system to collect, organize, and display posts from social media on the customer's own website, Nicho.com.
Senior JavaScript Developer
MyCrowd
- Developed a bug-reporting tool which can be displayed directly on the tested website.
- Created and developed MyCrowd products.
JavaScript Developer
Netstellar
- Developed a system based on the Ext JS framework.
- Created new features for existing apps.
- Extended Ext JS with custom functionalities.
JavaScript Developer
Can’t Stop Games
- Developed the graphical user interface of the game Tanadu using pure JavaScript (without external libraries).
- Created customized libraries and optimized code.
- Wrote adaptation code for browsers like Firefox, IE 7/8, Safari, and Chrome in order for the apps to run smoothly on multiple browsers.
PHP Developer | Senior PHP Developer | Team Manager
Interactive Marketing Partner
- Developed websites in PHP and PostgreSQL based on Jet.CMS.
- Provided support for the Jet.Mail system.
- Managed a team consisting of six people (one graphic designer, three PHP developers, and two testers).
- Led, managed, and created projects for clients.
Experience
Flash Trade
http://flash.tradeThe TypingCat
https://thetypingcat.comOnline Freight Quoting Platform
http://icontainers.comNicho
https://sociofabrica.com/nicho-platform/System for Online Cryptocurrency Exchange
Online TV Brodcast
Education
Completed Credits towards a Degree in Information Technology Management System and Design
Warsaw School of Economics - Warsaw, Poland
Master's Degree in Mathematics and Computer Science
University of Wrocław - Wrocław, Poland
Skills
Libraries/APIs
Marionette.js, Socket.IO, React, jQuery, Backbone.js, React Query, React Hook Form, REST APIs, React Navigation, Redux-Saga, D3.js, Node.js, Web3.js, Stripe, Stripe API, Sockets, Puppeteer, WebRTC
Tools
Git, Adobe Photoshop, Figma, GitHub, GitLab, MetaMask, Claude Code, Claude, Sentry, Stylus, MATLAB
Languages
HTML5, ECMAScript (ES6), CSS, HTML, JavaScript, TypeScript, PHP, Markdown, CSS3, Less, Solidity, Ruby, Sass, GraphQL, Python
Frameworks
Next.js, Redux, Vanilla JS, Bootstrap, Ext JS, Tailwind CSS, Express.js, Jest, React Native, Ruby on Rails (RoR), AngularJS, NestJS
Paradigms
Functional Programming, Real-time Systems, Search Engine Optimization (SEO), Responsive, Unit Testing, B2C
Platforms
iOS, MacOS, Meteor, Amazon Web Services (AWS)
Storage
JSON, MySQL, PostgreSQL, MongoDB, Redis, Amazon S3 (AWS S3)
Industry Expertise
Trading Systems
Other
Ajax, WebSockets, React Hooks, Front-end, Full-stack, Software Development, Storybook, API Integration, Web Development, Performance Optimization, Code Review, Responsive UI, User Management, Figma to React, Responsive Design, Core Web Vitals, Debugging, Multilingual Websites, RESTFul APIs, Software Architecture, Static Site Generators, Strapi, Architecture, AI Tools, Cursor AI, Payment Gateways, PayPal, CI/CD Pipelines, 2D Games, SSG, CMS Structure & Configuration, Dynamic Routing, Full-stack Development, iGaming, Third-party APIs, Dashboards, Real-time Data, Trading, Smart Contracts, Styled-components, Machine Learning, Agile Sprints, Integration Testing, IT Project Management, Programming, Message Bus, Solana, Server-side Rendering (SSR), Performance, Zustand, GDPR, Headless WordPress, Apollo, User Experience (UX), User Interface (UI), Cloudflare, GitHub Actions, Supabase, General Data Protection Regulation (GDPR)
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