Ugljesa Pantic, Developer in Belgrade, Serbia
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Ugljesa Pantic

Verified Expert  in Engineering

Front-end Developer

Belgrade, Serbia
Toptal Member Since
March 20, 2017

Ugljesa is a passionate software engineer who started programming in grade school. After getting his bachelor's degree in computer science, he worked for two large international companies–developing mostly web applications for several years. Ugljesa is accustomed to a distributed environment and working with remote clients using agile methodologies.



Preferred Environment

IntelliJ IDEA, Visual Studio Code (VS Code), Git, Linux, Windows

The most amazing...

...project I've coded is an easy-to-use Java library used for testing complex data driven applications.

Work Experience

Front-end Developer

2020 - PRESENT
  • Led the front-end development of a smart price recommendations platform used by large retail and eCommerce clients.
  • Implemented and managed companies' Design System library.
  • Profiled critical components, eliminating wasting renders which dramatically improved performance.
  • Simplified the project structure, emphasizing reusability and scalability.
Technologies: React, TypeScript

Full-stack Developer

2019 - 2020
Avatar Engines LLC
  • Worked on providing API endpoints with Node.js/Inversify and MongoDB.
  • Built from scratch admin platform for managing platform's database entities and users using React, Node.js, and Mongoose.
  • Implemented complex UI components with React/TypeScript and SCSS.
  • Improved the UX by creating several DnD-based components.
  • Wrote scripts to use and manipulate data from various sources.
Technologies: MongoDB, Node.js, React

React Developer

2019 - 2019
Mobilize (via Toptal)
  • Migrated an AngularJS codebase into React.
  • Implemented new features on community platform.
  • Improved the front-end architecture by reorganizing modules.
Technologies: Styled-components, Redux, React

React Developer

2019 - 2019
BCG GAMMA (via Toptal)
  • Developed a prototype used to visualize transportation routes using React, Antd, and
  • Built a scheduling tool in the form of a Gantt chart using React and Material-UI.
  • Researched and selected libraries and tools.
  • Balanced requirements, UX, and deadlines in order to get most of the business value in a limited timeframe.
  • Designed APIs and manipulated big data.
  • Composed scripts—with Python and Node.js—to parse complex data structures.
Technologies: Node.js, Recharts, Python,, React

Front-end Developer

2019 - 2019
Softimation (via Toptal)
  • Finished implementing a cryptocurrency exchange built using Angular.
  • Handled the pixel-perfect implementation of the specs (Zeplin).
  • Used Angular animations to improve the overall UX.
  • Converted a web app to a native version using Cordova.
  • Transformed the app to be mobile-first and fully responsive.
Technologies: NgRx, Angular

Senior Front-end Developer

2017 - 2019
Goreha (via Toptal)
  • Led the front-end development of a multi-lingual digital rehabilitation platform.
  • Used Angular 5 and NgRx to make the Reactive front end.
  • Migrated and merged an admin panel application into the platform.
  • Built from scratch a product website with React and GatsbyJS.
Technologies: Bootstrap, Angular Material, NgRx, Angular

Front-end Developer

2017 - 2017
Paladin (via Toptal)
  • Implemented a mobile-first responsive design.
  • Introduced style guides to the project.
  • Improved the overall user experience.
Technologies: Django, Bootstrap

Expert Front-end Developer

2017 - 2017
Thinkover (via Toptal)
  • Designed the application architecture.
  • Led the front-end development.
  • Implemented visual design solutions (Zeplin).
  • Visualized several data structures using D3.js.
  • Introduced Sass style guides for a responsive design.
Technologies: D3.js, TypeScript, Angular

Software Engineer

2015 - 2016
Zuehlke Engineering
  • Worked on several mobile-first web applications with rich user experiences.
  • Led the development process of a portfolio management tool application for an investment company in Zurich.
  • Designed several charts for the visualization of complex data sets using D3.js.
  • Gave lectures on various technical topics such as ECMAScript 6 and unit testing.
  • Mentored and knowledge-shared with younger colleagues.
Technologies: CSS, HTML, Aurelia, AngularJS, Spring, Java, JavaScript

Software Developer

2014 - 2015
Levi9 Global Sourcing Balkan
  • Worked as a part of an Agile team in the development of an enterprise service bus for Amsterdam Airport.
  • Designed and developed multiple OSGI modules for integration with external and internal systems.
  • Redesigned and refactored a system making it more maintainable and highly testable.
  • Introduced guidelines for unit testing on a project.
Technologies: Web Services, OSGi, Hibernate, Spring, Java

Think Alpha Platform

Think Alpha is a platform for real-time idea generation and strategy development. The system is designed to allow those with ideas to build and maintain systematic alpha-generating ideas in real-time and at low-latency. Non-coders are able to build sophisticated programs without any engineering background and programmers have a set of tools that dramatically increase productivity.
The platform is under development and it's built with React, Node.js, and TypeScript.

Caspar Health Web Platform
Caspar Health is an online platform that is trying to shape the future of prevention and rehabilitation. The product is used by 81 clinics in Europe and Asia and helps all of their 35,000 patients receive the best quality care—both during and after their hospital stay.

The platform consists of multilingual patient and clinic web applications built using Angular, NgRx, and Material Design.

Business Matching Platform (POC)

A proof of concept web app that allows users to create posts, that can be later searched via tags/preferences.

The front end was built with React and API with Node.js Firebase functions and MongoDB. Messaging was implemented with Firestore.

Caspar Health Product Website
While working for Goreha/Caspar, I helped with the development of the company's website that contains the main
product and services information.

Technologies: React, GatsbyJS, GraphQL

Personal Management Tool

This is a minimalistic tool that helps you organize and remember things you need to; it includes features like a shopping list and clipboard. It started as a side project that turned into something that I use on a daily basis.

The tool is basically a mobile-first progressive web app, built with React/Redux on front-end, a serverless Node.js back end, and MongoDB. It is hosted on AWS (S3, CloudFront, Route53).

Portfolio Management Tool for an Investment Company

This application was built with the idea to help a client predict an outcome for his investment. My role on the project was to create a rich and easy-to-use UI that will allow the client to simulate possible investment outcomes depending on the various influencing factors.

Technologies: AngularJS, Spring Framework, R

Monitoring Web Application for Monitoring Solar Panel Efficiency

My job was to visualize the production, consumption, and distribution of solar panels energy to end users.
This mobile-first application was build using AngularJS, TypeScript, and D3.js for visualization.

IoT Project for a Pump Manufacturer

This application was built to allow users to remotely live-monitor and inspect the state of their infrastructure. The pump data is then sent to an Azure IoT hub where it's aggregated and processed.

On this project, I worked on a client application that consumed REST and SignalR endpoints in order to display valuable and live data to the user. The application was built on top of Cordova using the Aurelia framework and TypeScript.


CSS3, HTML5, ECMAScript (ES6), TypeScript, JavaScript, CSS, HTML, SQL, Java, Python, GraphQL


Angular, Redux, JUnit, Spring, AngularJS, Hibernate, Aurelia, Express.js, Jasmine, OSGi, Django, Angular Material, Bootstrap,, MUI (Material UI)


React, jQuery, TensorFlow, Node.js, REST APIs, D3.js, WebRTC, NgRx, Recharts, SignalR, RxJS, Antd


Git, Webpack 2, Karma, Webpack, IntelliJ IDEA, Jenkins


Distributed Programming, Unit Testing, REST, Scrum, Object-oriented Design (OOD), Agile Software Development, Test-driven Development (TDD), MEAN Stack


Responsive Design, Front-end, Serverless, Data Structures, WebSockets, Full-stack, Client-side JavaScript Frameworks, User Interface (UI), Back-end, Web Services, Styled-components, Progressive Web Applications (PWA), PWA, API Design, Mobile First


Visual Studio Code (VS Code), Firebase, Docker, Windows, Linux, Amazon Web Services (AWS)


Cloud Firestore, MongoDB, MySQL, H2, Amazon S3 (AWS S3)

2010 - 2014

Bachelor of Science Degree in Computer Science

University of Belgrade, Faculty of Mathematics - Belgrade, Serbia