Branislav Popovic

Scaled cloud-native microservices backend on Azure; grew monthly active users from 250,000 to 550,000 while maintaining 99.95% availability. Optimized SQL Server with indexing and Redis caching, reducing API response time from 450 ms to 250 ms and DB query time from 800 ms to 320 ms. Increased system throughput from 1,200 to 3,600 requests per second via asynchronous processing and event-driven architecture. Automated CI/CD pipelines in Azure DevOps, shortening deployment time from 45 to 9 minutes and enabling multiple weekly releases. Reduced infra costs by 22% through resource optimization, database tuning, and caching improvements.

Developed AI-powered recommendation and semantic search capabilities, increasing customer engagement by 35%, average order value by 22%, and conversion rate by 18%. Automated product, order, inventory, and customer synchronization via API-driven and event-driven workflows, reducing manual processing time from 20 hours to 6 hours per week. Improved storefront response times from 650 ms to 390 ms through backend optimization and Shopify API integrations. Collaborated with product, frontend, QA, and DevOps teams to deliver secure, highly available e-commerce solutions, accelerating feature delivery by 30%.

Built a subscription billing platform using Stripe APIs, implementing automated provisioning, invoicing, renewals, payment reconciliation, and webhook processing. Supported growth from 8,000 to 22,000 recurring transactions per month while maintaining 99.9% payment processing accuracy. Implemented resilient webhook orchestration and retry mechanisms, increasing successful payment event synchronization from 96.5% to 99.95%. Optimized subscription lifecycle workflows, reducing payment failures by 28% and improving customer retention by 18%. Delivered real-time reporting and analytics capabilities, reducing revenue reconciliation time from 12 hours to 3 hours.