Andrija Kovač

Lead Software Developer · Rijeka, Croatia

Portfolio

AI copilots, 20+ Chrome extensions, browser automation, full-stack web apps and game tooling — for startups and for clients like Outbrain, MedeAnalytics and Crossbeam.

Live modulesLatency: — // Loc: Rijeka, Croatia

kovac.sys --init

Three chapters, each running live in your browser. Switch to Backend Mode to see what they are doing.

Active modules

Visual Feed

Game DevBuild: 4h → 40min

MadHead Games // Pagan Online

System developer on Pagan Online. I built a distributed CI/CD system: hourly automated builds spread across several servers, which cut build times from 4 hours to 40 minutes.

  • Rewrote the legacy Python build system in Node.js and wrote custom C++ tooling (+40% team productivity).
  • Before that: Queen's Quest 5 (Brave Giant), an Amazon Alexa game (Thorium Games) and a mobile MMO (Macrogames).
Space / tap to jump
  • C++
  • Node.js
  • Python
  • Unreal Engine
  • Unity
  • C#
Chrome ExtStudents: 500,000+

Mobile Guardian // Classroom extension

Designed and shipped the Chrome extension that manages Chromebooks in every school in Singapore's national education system. It handles real-time monitoring, WebRTC video calls, screen sharing, file transfer, web filtering and classroom management.

  • Led front-end development in React and AngularJS, and mentored the team on Chrome Extension APIs and enterprise-scale deployment.
  • Since then: 20+ extensions for clients on Upwork, including Crossbeam, Scalelist, Post My Party, Paydirt and GrapeID.
Classroom · 3B12 devices · demo data
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The call is a real WebRTC handshake between two peer connections in this tab. The block rule is only a preview.

  • Chrome MV3
  • WebRTC
  • TypeScript
  • React
  • AngularJS
CTO ModeNiviem Software // 2022 – 2023

Niviem Software // CTO & Team Lead

This is the period I'm proudest of. As CTO I was responsible for the technology, and also for hiring, organising and running the team and the business side of the company.

  • Learned how business processes, team development and strategic management fit together.
  • I stepped back when market conditions made it hard to win the right clients. What I learned there shaped everything I have done since.

An illustrative capacity model (≈0.2 req/s per user, ~400 req/s per API node), not Niviem's figures.

  • Leadership
  • Architecture
  • Hiring
  • Node.js
  • PostgreSQL

Selected projects · 2018 – today

20+ projects from scratch

From 2021 to 2025 I was lead developer on enterprise work for Fortune 500 companies and startups, running projects end to end, from technical discovery to deployment. Top Rated Plus on Upwork.

Under NDANorriva

Norriva

2025 – Present

Lead Full-Stack Developer

Business-planning SaaS with multi-agent AI copilots built on Google ADK and Gemini, organization accounts, subscription tiers, and per-seat billing. Leading the full-stack work and a team of two developers.

  • Google ADK
  • Gemini
  • Next.js
  • Node.js
  • TypeScript
Verjobs screenshot

Verjobs

Aug 2024 – Jan 2025

Full Stack Developer

A job aggregator for sourcing the best jobs for a person. Built the front-end side and helped with the backend.

  • React
  • Next.js
  • TypeScript
  • Tailwind
  • AWS
  • Node.js
Post My Party screenshot

Post My Party

Feb 2024 – Jul 2024

Google Chrome Extension Developer

All-in-one marketing platform for Social Sellers. Fully developed the Google Chrome extension for automating Facebook posts.

  • Chrome MV3
  • TypeScript
  • Web Scraping
  • Web Automation
Scalelist screenshot

Scalelist

Nov 2023 – Mar 2024

Google Chrome Extension Developer

Export leads from LinkedIn Sales Navigator in one click and enrich them with verified emails and phone numbers. Developed the Chrome extension.

  • Chrome MV3
  • TypeScript
  • Web Scraping
  • Web Automation
MedeAnalytics screenshot

MedeAnalytics

Mar 2023 – Dec 2023

Lead Frontend Developer

Data-driven insights that help healthcare organizations improve financial, operational, and clinical outcomes. Led the front-end team.

  • React
  • TypeScript
Paydirt screenshot

Paydirt

2023

Google Chrome Extension Developer

A time tracking and invoicing tool for freelancers. Developed the Google Chrome extension.

  • Chrome MV3
  • TypeScript
Under NDAInventory Reconciliation

Inventory Reconciliation

Dec 2022 – Feb 2023

Application Developer

An application that helps in reconciling the inventory of a company. Developed the entire application in Rust.

  • Rust
  • Tauri
Outbrain screenshot

Outbrain

Mar 2022 – Dec 2022

JavaScript Developer

Web advertising platform that displays boxes of links to pages within websites. Worked on various parts of the project.

  • JavaScript
  • Java
Crossbeam screenshot

Crossbeam

Jan 2022 – Mar 2022

Google Chrome Extension Developer

Partner ecosystem platform that helps companies build more valuable partnerships. Developed the Google Chrome extension.

  • Chrome MV3
  • TypeScript
  • Web Scraping
  • Web Automation
GrapeID screenshot

GrapeID

2021 – 2022

Google Chrome Extension Developer

Extension offering various security and identity preservation features with AES encryption.

  • Chrome MV3
  • TypeScript
  • AES
Under NDAVirtual Team Game

Virtual Team Game

May 2021 – Jan 2022

Game Developer

A virtual team game that helps in team building. Developed the entire game.

  • Cocos Creator
  • JavaScript
Mobile Guardian screenshot

Mobile Guardian

Feb 2020 – Jul 2021

Full Stack Developer

Mobile device management solution used across all educational institutions in Singapore. Developed the Chrome extension, worked on the front-end, and mentored junior developers.

  • Chrome MV3
  • AngularJS
  • WebRTC
  • TypeScript
Pagan Online screenshot

Pagan Online

Mar 2019 – Feb 2020

Tools Developer

Fast-paced hack-and-slash action RPG at MadHead Games. Created a variety of tools for the game and the company, including a CI/CD system reducing build times from 4 hours to 40 minutes.

  • Python
  • Node.js
  • C/C++
  • Unreal Engine
Within Whispers: The Fall screenshot

Within Whispers: The Fall

Jul 2018 – Mar 2019

Amazon Alexa / Game Developer

A point-and-click adventure game. Developed the Amazon Alexa skill for the game and also worked on the game itself.

  • Amazon Alexa
  • Node.js
  • Unity
  • C#