Darko Alija

Developed and maintained high-performance online casino and sportsbook platforms using React/Vue on the frontend and Node.js/ASP.NET/Java (Spring Boot) on the backend. Integrated third-party game provider APIs, real-time betting odds, and payment gateways. Built secure multi-currency player wallet systems supporting fiat and cryptocurrencies, including transactional integrity, idempotent processing, and reconciliation workflows. Implemented enterprise payment gateway flows (hosted cashier, deposits, withdrawals, refunds) with asynchronous webhook/callback state handling for accurate settlement and fault tolerance. Added KYC/AML verification, onboarding, session management, and role-based access control with PCI-aware flows to ensure sensitive data stayed out of core systems. Implemented fraud-risk workflows with manual review and admin approval/denial including audit trails. Built promotional and engagement features (bonus engine, free spins, leaderboards, VIP programs) with region/jur

Architected and developed scalable backend systems for an affiliate and marketing platform serving the iGaming industry, focused on performance and availability under heavy traffic. Designed and deployed a modular Affiliate API to support tracking pixels, campaign metadata, and conversion events for partners across global markets. Implemented commission engines for CPA, Rev Share, and Hybrid models with flexible compensation logic, accurate tracking, and scheduled invoicing pipelines. Integrated fraud detection using user behavior analysis, geolocation, device fingerprinting, and IP blacklisting to prevent fake signups and fraudulent conversions. Built secure role-based admin dashboards for affiliate managers with REST APIs enabling partner management, campaign configuration, traffic analytics, and approval workflows. Delivered automated reporting and analytics via dashboards and periodic email dispatches. Ensured data consistency, auditing, and GDPR compliance with token-based authent

Led backend architecture for a large-scale e-commerce platform handling millions of daily transactions. Built event-driven microservices and real-time data processing using Apache Kafka. Developed backend services with Spring Boot and optimized performance using Redis caching and Hibernate/JPA for database operations. Implemented casino and sportsbook modules (wallets, betting logic, affiliate systems) and integrated major game providers via secure APIs. Delivered REST APIs and websocket services, including unit/integration testing with Jest/Vitest/Mocha/Chai/React testing tools. Improved scalability and reduced downtime, enhanced CI/CD deployment frequency, and optimized SQL Server queries for significant response-time gains.