Senior Full-Stack Developer / Srđan

13+ years of experienceBelgrade, Serbia

Senior full-stack developer with 10+ years building high-traffic products across gambling, fintech, cybersecurity, SaaS, and e-commerce. Core stack: Python (Django, Flask, FastAPI) and Node.js/PHP (NestJS, Laravel) on the backend, React/Vue.js/Next.js on the frontend. Strong track record in microservices, real-time systems, security, and performance under load, plus production LLM/AI experience including a live comment-moderation system.

Skills

  • Production-scale experience: Core developer on a gambling platform with 200,000+ daily active users, working across accounts, payments, real-time WebSockets, and content delivery microservices.
  • Django/Python fit: Deep hands-on experience with Django, Flask, and FastAPI — directly aligned with the required backend stack, not a stretch.
  • Modern frontend: Skilled in Next.js, React, Vue.js, and TypeScript, with real production use of Next.js.
  • AI/LLM in production: Designed and shipped a live LLM-based comment moderation system, plus broader experience embedding AI tooling into development workflows.
  • Security & access control: Track record hardening authentication, wallet/payment systems, and reducing attack surface on a high-stakes platform.
  • SaaS & API design: Built customer-facing SaaS products end-to-end (surveys, dashboards, reporting pipelines) with strong REST API design and performance optimization under heavy load.

Experience

2024 — now

Senior Full-Stack Developer

The Unit
  • Core developer on high-traffic gambling platform serving 200k+ daily active users globally
  • Built microservices for login, wallet, payments, store, real-time WebSocket, notifications and content delivery
  • Shipped companion platform for gambling streamers with bonus hunts, chat raffles, custom commands and live viewer interactions
  • Designed and deployed LLM-based comment moderation system reducing manual moderation workload
  • Hardened REST APIs, profiled hot paths, optimized caching and socket throughput for heavy concurrent traffic
2020 — 2024

Senior Full-Stack Developer

Blue Grid
  • Built survey features, data pipelines and reporting dashboards for MetricsFlare customer-success analytics platform (Node.js/Express, Vue.js)
  • Refactored Vue.js components and Flask/Node.js microservices for Link11 cloud cybersecurity provider (DDoS protection, WAAP, CDN, DNS)
  • Developed custom Shopify API integrations and storefront features for Recharge subscription app premium merchants (NestJS)
  • Delivered data warehouse for large-scale processing, reporting and dashboards with Python-based processing
  • Built AWS Lambda functions for ingestion, transformation and scheduled ETL in event-driven serverless pipelines
2016 — 2020

Full-Stack Web Developer

Wollson
  • Built and maintained HR management single-page app for employee workflows, data management, reporting and admin tooling
  • Developed custom e-commerce sites, custom CMS and WordPress plugins (PHP, Laravel, Symfony)
  • Built hotel reservation platform with reservation flows, availability management and third-party integrations handling high booking volumes
2011 — 2016

Freelance Full-Stack Developer

Self-Employed
  • Built OddsNavigator live betting portal aggregating odds, fixtures and player stats from multiple bookmakers
  • Developed backend for Predictology sports-betting system builder processing very large XML/JSON feeds
  • Solved scaling and performance problems ingesting and computing over huge betting datasets
  • Delivered dozens of custom sites and WordPress solutions across industries, owning projects from requirements to deployment

Education

2010 — 2015

Business Informatics & E-Business

Belgrade Business and Arts Academy of Applied Studies

Contact

Takovska 5, Belgrade, 🇷🇸 Serbia.

Email: [email protected]