Ljubisa Knezevic
Front-End Engineer | React, JavaScript
Salary / Daily rate
Belgrade, Serbia
Freelance, open to permanent contract
Skills
Languages
About me
Intro
Frontend Engineer with 4+ years specializing in React, Next.js, and TypeScript. Led LMS platform modernization serving 35K+ courses and developed creator platform with 400K+ user reviews. Expert in performance optimization, team mentorship, and delivering scalable web solutions that drive measurable business results.
Work experience
Frontend Developer
MENTORTOOLS
Oct 2024 - Present
2 years 1 month
Belgrade, Serbia · Remote
• Rewrote, modernized and optimized an LMS platform using Material UI, React Query, Next.js on a platform with 35,000+ courses • Led the complete overhauling of the front-end of an LMS platform landing page, increasing Lighthouse scores by 20 points • Mentored junior and mid-level developers through code reviews, pair programming, and technical guidance leading to improved team capabilities and productivity • Implemented various features, focusing on responsiveness, UI, user satisfaction, load times, maintainability and best practices
Quantox Technology
Sep 2021 - Oct 2024
3 years 2 months
Belgrade, Serbia
Front-end Web Developer
Mar 2022 - Oct 2024
2 years 8 months
Belgrade, Serbia
• Developed a creator discovery platform using Next.js, TypeScript, Tailwind CSS, and Firebase, with the service amassing over 400,000 user reviews • Collaborated with a team of 5 developers on a complete rewrite of a dating website, increasing website SEO score and traffic, and increasing code scalability and reusability • Optimized and upgraded web templates using Gatsby.js and serverless functions, increasing user experience, and decreasing maintenance costs by 80% • Contributed to various projects, including CMS projects and a pet monitoring web app, utilizing Next.js, TypeScript, React Query, MUI and Tailwind CSS
Frontend Developer
Sep 2021 - Mar 2022
7 months
Belgrade, Serbia
• Excelled as the top performer in a competitive internship program with 100 participants • Developed an internal HR application using Express.js, React and MySQL, and created best graded responsive websites using React, ES6, CSS3, HTML5.
Frontend Developer
Mühlbauer Group
Jun 2020 - Oct 2020
5 months
Stara Pazova, Serbia
• Developed ABIS and e-Gov Web Apps and RESTful APIs using ES6 and React on the front-end
Education
The School of Electrical and Computer Engineering of Applied Studies
Master appl.
2022 - Present
4 years 10 months
The School of Electrical and Computer Engineering of Applied Studies
Bachelor appl.
2016 - 2020
4 years 1 month