Systems and platforms I’ve built across fintech, gov-tech, and enterprise - most recent first.
Cross-border electronic toll collection platform for JP Putevi Srbije - a distributed, high-availability system processing millions of transactions, with real-time payment integration and daily data synchronization across Serbia, North Macedonia, Montenegro, Croatia, and Republika Srpska. Also built the supporting ERP for invoicing, billing reconciliation, and reporting.
Modern governance platform - full-stack architecture, API layer, and backend services, with AI-driven automation that reduces manual workflow steps for end users.
Backend engineering for one of the world's largest online trading brokers (20M+ users): high-throughput trading systems, API development, and platform reliability.
Complete migration of 6 Node.js microservices to a React/Laravel stack, backed by MongoDB and PostgreSQL.
Team lead on the MyHall portal connecting students, tutors, and local Halls across a network of micro-colleges based on the Oxford tutorial model. Rebuilt the platform from a previous team's solution onto a new architecture and added new management functionality.
SEC-registered U.S. national securities exchange - application architecture and system components across backend and frontend under strict regulatory and audit requirements, deployed and operated on AWS.
Online booking and customer-management platform. Took over the codebase, owned the full architecture across frontend and backend, and prepared the migration from Phalcon to Laravel on AWS.
Core team member on the Moj Telenor mobile API, the primary digital interface for 1.3M+ users: authentication, account management, balance tracking, bill payments, and service activation. Owned the USSD codes platform.
Workforce time-and-attendance system for Gradska Čistoća, the National Employment Service (NSZ), and the Municipality of Voždovac. Built the PHP/MySQL platform plus a custom check-in device - Raspberry Pi with Python, a webcam, and RFID-card check-in - deployed across 150+ locations nationwide.
High-traffic features for a leading Swiss real-estate portal - platform migration to new hosting infrastructure, internal frontend performance dashboards, and custom WordPress themes and plugins.
Backend development of the mobile API for the Shpock marketplace app.
Built the Halo Oglasi classifieds portal from scratch.
Development on the Tehnomanija e-commerce platform.