Hi! I’m Matija, a frontend developer with solid experience building clean, responsive, and high-performing web interfaces. I specialize in React, JavaScript, HTML/CSS, and API integration, focusing on clarity, speed, and maintainable code. I take on project-based or part-time work, from debugging and improving existing sites to developing modern one-page websites or functional web apps. My goal is always to deliver efficient solutions that look great and work flawlessly. Whether you need a quick fix, a polished landing page, or a lightweight custom app, I’m available to help you bring your idea to life — reliably, on time, and with attention to detail.

MATIJA KOSMAC

Hi! I’m Matija, a frontend developer with solid experience building clean, responsive, and high-performing web interfaces. I specialize in React, JavaScript, HTML/CSS, and API integration, focusing on clarity, speed, and maintainable code. I take on project-based or part-time work, from debugging and improving existing sites to developing modern one-page websites or functional web apps. My goal is always to deliver efficient solutions that look great and work flawlessly. Whether you need a quick fix, a polished landing page, or a lightweight custom app, I’m available to help you bring your idea to life — reliably, on time, and with attention to detail.

Available to hire

Hi! I’m Matija, a frontend developer with solid experience building clean, responsive, and high-performing web interfaces. I specialize in React, JavaScript, HTML/CSS, and API integration, focusing on clarity, speed, and maintainable code.

I take on project-based or part-time work, from debugging and improving existing sites to developing modern one-page websites or functional web apps. My goal is always to deliver efficient solutions that look great and work flawlessly.

Whether you need a quick fix, a polished landing page, or a lightweight custom app, I’m available to help you bring your idea to life — reliably, on time, and with attention to detail.

See more

Experience Level

Expert
Expert
Expert
Expert
Expert
Expert

Language

English
Fluent
Croatian
Fluent
Swedish
Advanced

Work Experience

Frontend Developer at AssaAbloy Global Web
May 1, 2021 - November 3, 2025
Built and maintained React components for AssaAbloy Global websites used by B2B companies. Collaborated within a large Agile Kanban team using JIRA and Slack. Developed with JavaScript, React, TypeScript, CSS, and Styled Components. Implemented components for Adobe AEM OneCMS with bi-weekly releases. Used Git and CI/CD workflows; designs from Figma integrated.
Frontend Developer at Kamafai
May 1, 2020 - November 3, 2025
Internal development projects for Comsys AB: Online sizing tool configurator (front-end & back-end) with a team of 3 developers. Technologies included JavaScript, React, Node.js, HTML, CSS, JIRA, MySQL.
Frontend Developer at Kamafai
May 1, 2020 - November 3, 2025
Online log analyzer (Comsys OLA): frontend development for a web application that analyzes log files and visualizes data with graphs and charts. Technologies included JavaScript, React, Node.js, HTML, CSS, JIRA, MySQL.
Frontend Developer at Kamafai
May 1, 2021 - November 3, 2025
Kamafai KB: Company Trading App and account portal; implemented a new visual interface. Technologies included JavaScript, React, Node.js, HTML, CSS, SCSS, JIRA, MySQL.
Frontend Developer at Kamafai
May 1, 2021 - November 3, 2025
The Conference – Media Evolution: Team of 2 developers building a new website with added functionality; refactored legacy code and migrated to new portal. Technologies included JavaScript, HTML, CSS, JIRA, Heroku, Git.
Frontend Developer at Kamafai
May 1, 2020 - November 10, 2025
Frontend developer at Kamafai, a consulting agency providing software development services for a range of clients. Worked on multiple client projects including Comsys OST (online sizing tool configurator), Comsys OLA (online log analyzer), Kamafai KB (Trading App and account portal), and The Conference website. Responsibilities included frontend development, collaborating with a small team of 3 developers, implementing UI with JavaScript, React, Node.js, HTML, CSS, and MySQL, and managing tasks in JIRA. Ensured responsive, accessible interfaces and aligned with product requirements. Delivered UI components with a focus on UX, performance, and maintainability. Tools used: JavaScript, React, Node.js, HTML, CSS, JIRA, MySQL.
Frontend Developer at KAN
May 1, 2021 - November 10, 2025
Frontend developer for AssaAbloy Global Web projects. Built and maintained React components for AssaAbloy Global websites used by B2B companies. Worked within a large Agile Kanban team using JIRA and Slack. Implemented components with JavaScript, React, TypeScript, and CSS/Styled Components; used Git and CI/CD workflows. Integrated designs from Figma, and delivered high-end components for Adobe AEM OneCMS with bi-weekly releases. Regularly coordinated with the team to ensure quality and functionality of components.
Founder & Partner Manager at REFERO Studio
May 1, 2020 - May 1, 2020
Founder and Partner Manager at REFERO Studio, a startup building web projects. Responsibilities included defining business development strategy, expanding to international markets, assembling a multidisciplinary team, defining product strategy and market reach, and leading development efforts. Achievements include delivering finished products from scratch to publish. Technologies and tools used included WordPress, HTML, CSS, RISAN.
Founder, Freelancer Manager at RISAN
July 1, 2012 - July 1, 2012
Founder and Freelancer Manager at RISAN, a consultancy building reliable web solutions. Responsibilities encompassed acquiring new clients, nurturing relationships, project management, and leading development for key clients. Achievements include establishing relationships with international agencies and managing/ supporting over 100 successful projects. Stack included WordPress and related web technologies.

Education

Bachelor in programming at Algerba University
November 10, 2000 - November 10, 2025

Qualifications

Add your qualifications or awards here.

Industry Experience

Software & Internet, Media & Entertainment, Professional Services, Other