
James Lee
Senior Frontend Developer | React & Next.js
Salary / Daily rate
Warsaw, Poland
Freelance, open to permanent contract
Remote only
Skills
Languages
About me
Intro
Senior Frontend Developer with 10+ years building high-performance web applications using React, Vue, and Next.js. Delivered AI-powered applications, blockchain trading platforms, and data visualization dashboards with proven 20% speed improvements. Expert in modern JavaScript frameworks and scalable architecture - ready to transform your frontend vision into reality.
Work experience
Senior Frontend Developer
obodo
Nov 2022 - Present
4 years
London, UK
- Developed several AI-powered applications, integrating advanced GPT models for enhanced functionality and user experience. - Pioneered the frontend development from the ground up using React and Next.js, achieving a 20% speed improvement by implementing global state management solutions like Redux and Context API. - Designed and implemented a data-driven structure for prompt engineering, ensuring 90% alignment with user requirements. - Engineered a flexible and scalable frontend architecture, along with the necessary APIs to support seamless integration. - Translated design concepts and wireframes into high-quality, production-ready code. - Conducted thorough code reviews to maintain high standards of code quality and efficiency. - Continuously stayed abreast of the latest industry trends and technologies, ensuring that applications remain modern, competitive, and effective.
Senior Frontend Developer
Northdex
Jan 2019 - Dec 2022
4 years
Istanbul, Türkiye · Remote
- Developed a blockchain centralized exchange (CEX) application from the ground up using Vue.js, adhering to component-based architecture for scalability and maintainability. - Collaborated closely with backend teams to design and implement APIs for seamless data fetching and manipulation. - Integrated real-time communication features using WebSocket, and developed dynamic trading charts leveraging the TradingView library. - Wrote clean, well-structured code that adhered to best practices and coding standards, resulting in a 20% improvement in development efficiency and ease of mentoring. - Monitored and optimized frontend performance, achieving a 15% improvement in speed and responsiveness. - Troubleshot interface software issues and debugged application code to ensure smooth and reliable functionality.
Senior Frontend Developer
CKH Group
Mar 2016 - Dec 2018
2 years 10 months
Warsaw, Poland
- Successfully led multiple projects, consistently meeting 100% of client requirements and delivering exceptional results. - Leveraged advanced frontend technologies, including React, Vue, and Angular, to develop intuitive applications, incorporating UI/UX frameworks like Tailwind, Material UI, and employing test-driven development practices using Storybook. - Designed and built comprehensive dashboards using data visualization tools like Chart.js and D3.js, enhancing analytics capabilities by 30%. - Adhered to security best practices, ensuring the protection of user data with 100% compliance. - Implemented a streamlined CI/CD workflow, resulting in a 20% improvement in development efficiency and business management processes. - Continuously monitored and logged application performance to enable effective analysis and proactive issue resolution.
Frontend Developer
Sii Sweden
Apr 2014 - Mar 2016
2 years
Warsaw, Poland
- Took full ownership of projects, driving impactful changes for both customer-facing products and internal tools. - Designed and implemented user interfaces using React.js and its ecosystem, ensuring a seamless user experience. - Collaborated with backend teams to develop and optimize APIs for efficient data fetching and manipulation. - Delivered responsive, cross-browser compatible interfaces with a focus on high performance and scalability. - Wrote clean, well-structured code, adhering to industry best practices and coding standards. - Actively participated in design and product discussions to deliver the best possible user experience (UX). - Developed and built consumer-facing websites, prioritizing user engagement and functionality.
Education
University of Warsaw
Bachelor's degree
2010 - 2014
4 years 1 month