David Popović - Senior .NET Software Engineer

# JavaScript is off, so here is the whole CV as plain output.david@choda:~$ aboutDavid PopovićSenior .NET Software Engineer in Belgrade, SerbiaSenior .NET Software Engineer with 5+ years building backend systems, from high-throughput REST APIs to real-time data pipelines. Starting with a simple Sudoku game, I’ve built a career around optimizing systems for real business impact. I enjoy complex math and infrastructure challenges and love turning tough problems into elegant code.Languages English (C1 Advanced, Cambridge CAE)david@choda:~$ experience# ExperienceSenior .NET Software Engineer @ Freelance • StoraFebruary 2026 - September 2026 • Architected and built Stora, an e-commerce platform on isolated infrastructure per customer and country. • Designed a .NET 10 modular monolith (16 modules, schema per module) ready to split into microservices. • Built an SSR SvelteKit storefront with per-client theming (onboarding a new client is CSS + config, zero code changes) and a permission-aware admin SPA. • Designed JWT auth with rotating refresh tokens, CSRF protection and per-action admin permissions. • Set a P99 under 50 ms API budget; CI enforces module boundaries and runs integration tests on Testcontainers. • Owned GitLab CI/CD to Docker Compose VMs, with OpenTelemetry and Grafana for observability. • Built an AI catalog pipeline (~20k products) that rewrites SEO content, assigns categories and fills attributes, using Claude Sonnet 5 and GPT-5.6 Sol LLMs.Medior .NET Developer @ Wireless Media GroupSeptember 2025 - Present • Owned the migration of a newspaper CMS from ASP.NET Web Forms (.aspx) pages to .NET 10 REST APIs. • Rewrote data access from ADO.NET to Entity Framework Core with no performance penalty. • Optimized the page builder, cutting build time from 68s to 18s (~74% faster). • Improved on-page SEO and the performance of customer-facing APIs. • Deployed applications to AWS.Backend Software Engineer @ SodalisApril 2023 - August 2025, Belgrade • Led development of internal invoicing and procurement apps using WPF and .NET 8. • Integrated the e-commerce platform with the invoice API, speeding up order fulfillment by 57%. • Integrated Google Analytics and Google Ads APIs for real-time reporting, leading to up to 23% more sales. • Automated application publishing with OneClick deployment through GitLab CI/CD. • Deployed applications to Google Cloud.BusApp Project @ GSPOctober 2023 - October 2024, Belgrade • Led full-stack development of a real-time bus arrival tracking app in Python and Tkinter. • Built a web-based control panel in FastAPI for remote management of bus station display screens. • Deployed across 1000+ stations in Belgrade, improving public transport information.Backend Software Developer @ KnowitMay 2021 - March 2023, Belgrade • Built and maintained ASP.NET Core Web APIs for financial reporting and analytics. • Designed scalable PostgreSQL data models and secure OAuth2/JWT authentication. • Set up GitLab CI/CD pipelines for automated testing and deployment across environments. • Built a custom NuGet package for Excel report generation. • Configured Nginx load balancing for 400+ concurrent users with high availability.david@choda:~$ projects# ProjectsProxmox VE ServerSelf-hosted project, March 2023 - Present • Built a Proxmox server hosting Ubuntu Server VMs and Docker, with automated backup and restore.Self-Hosted GitLabSelf-hosted project, March 2023 - Present • Built CI/CD pipelines that automate testing, building and deployment, cutting manual work.Enigma Machine EmulatorSelf-hosted project, March 2020 - March 2021 • Built an Enigma machine emulator with rotor-based encryption, plugboard and dynamic rotor stepping. try it: enigma HELLO WORLDdavid@choda:~$ skills# SkillsBackend C#, .NET 10, .NET 8, ASP.NET Core, EF Core, Wolverine, Hangfire, xUnit, Python, FastAPIData PostgreSQL, MySQL, Redis, OpenSearchFrontend & desktop SvelteKit, React, Blazor, WPFDevOps & observability Docker, GitLab CI/CD, Nginx, Linux, OpenTelemetry, Grafanadavid@choda:~$ contact# Contactemail popovicdavid10@gmail.comlinkedin in/chodaweb choda.org