Resume

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Stefan Kovacic

Frontend Developer

Education

September 2013 – May 2017

Graduated from Gymnasium Gradiska – general education program.

October 2017 – October 2021

Pan-European University APEIRON, Banja Luka. 
Graduated with a Bachelor's degree in Computer Science, 240 ECTS credits.

Work Experience

Quantox Technology – Banja Luka

Full-time React Developer (Mar 2022 – Mar 2023)

Started with a 3-month internship, then continued full-time developing web apps using JavaScript, TypeScript, React, and Next.js, focused on clean UIs and scalable architecture.

Implemented advanced React features using Redux, React Query, REST APIs, React Hook Form, Axios, Tailwind CSS, and Chakra UI.

Used Git and GitHub for version control across both greenfield and existing projects, ensuring long-term stability and scalability.

Participated in regular code reviews and collaborative development workflows, using task management tools such as Jira and ActiveCollab.

ASL Digital Solutions – Belgrade (remote)

Part-time Frontend Developer (Jun 2024 – Dec 2024)

Supported agency developers in integrating JavaScript-based features into new and existing client websites.

Assisted with UI development and troubleshooting to improve responsiveness and user experience.

Contributed to the development of small- and mid-sized web projects for diverse client needs.

Wolter E-Marketing GmbH – Stuttgart (remote)

Full-time Frontend Developer (Apr 2023 – Present)

Delivering and maintaining web solutions for internal clients of Wolter E-Marketing GmbH, including established companies and large-scale corporate websites, with close collaboration and full ownership of all changes for Syntegon Technology.

Building responsive interfaces using modern JavaScript (ES6+) without frameworks, focusing on performance, clean architecture, and long-term maintainability.

Developing and customizing templates, modules, and marketing components in HubSpot CMS and TYPO3, tailored to specific client needs.

Styled interfaces with SCSS, applying scalable design systems and brand consistency.

Expanding backend capabilities by learning PHP, primarily within TYPO3 extensions and templating logic.

Courses

December 2021 – January 2022

HTML, CSS and JavaScript – Codecademy
Covered HTML structure, responsive CSS, and core JavaScript (functions, loops, DOM).

May 2022 – June 2022

React Developer – Udemy
Completed an online course covering React component architecture, props, state, hooks, and project structure.

February 2024 – March 2024

Certified HubSpot CMS Developer – HubSpot Academy
Learned HubSpot CMS: theme setup, templates, modules, and HTML/CSS integration.

October 2024 – December 2024

HubSpot Marketing & SEO Certifications – HubSpot Academy
Completed certifications covering HubSpot Marketing Hub, campaign building, and essential SEO principles for optimizing website performance and visibility.

Technologies

Frontend: HTML5, CSS, JavaScript (ES6+), TypeScript

Frameworks: React (Hooks, Context, Router, Hook Form), Next.js

Styling: SCSS, Tailwind CSS, Chakra UI

CMS: HubSpot CMS, TYPO3

State Management: React Query, Redux Toolkit, Context API

Tools & Workflow: Git, GitHub, JWT Auth, CI/CD basics, REST API integration

Social skills

Communicative

Easygoing and friendly

Flexible

Able to multitask on multiple levels

Easily adjustible to different type of situations and group work

Enthusiastic and engaged when interacting with people

About Me

Ambitious and self-motivated frontend developer with a strong passion for learning and continuous growth. I enjoy stepping out of my comfort zone, embracing new challenges, and exploring emerging technologies. Communicative and easygoing by nature, I integrate smoothly into new teams and thrive in collaborative environments.

When joining a new team, I’m always open to adopting their tech stack and development workflows, and I’m ready to learn new technologies as needed. I enjoy supporting teammates, contributing to a positive working atmosphere, and staying committed to high-quality, maintainable code.