Andrija – .NET, C#, .NET Core

A cloud platform for public transportation operators. He built its event-driven backend on C#/.NET and Azure, which processes thousands of real-time IoT messages per second from buses via MQTT and Azure Event Hub.

• Designed and built an event-driven backend processing thousands of IoT messages per second from buses using MQTT and Azure Event Hub.
• Developed real-time data processing services in C# and .NET 8/9/10 on Microsoft Azure.
• Designed and optimized data storage across SQL Server, MongoDB, and Redis.
• Set up cloud deployment, configuration, and security with Azure and Entra ID.
• Built CI/CD pipelines with GitHub Actions.
• Owned features end-to-end, from design through delivery, using AI-assisted tools (GitHub Copilot, Claude Code).

Card production and PIN printing systems for 15 banks across 8 Central and Eastern European countries. He developed and maintained card-issuing, PIN-generation, and migration systems that support multi-country formats and local regulatory requirements.

• Developed card and PIN production preparation systems serving 15 banks across 8 countries.
• Built card issuing and migration systems using C#, .NET, DB2, and Web Forms.
• Developed web applications with ASP.NET MVC, C#, SQL Server, and jQuery.
• Integrated Thales 9000 HSM for secure PIN processing.
• Supported multi-country card formats and local regulatory requirements.

Business process automation for a national postal service. He analyzed existing processes, designed the automation architecture, and built backend services, SharePoint workflows, and integrations with existing systems, covering workflow handling, data validation, and reporting.

• Analyzed existing business processes and designed the automation architecture.
• Developed business process management and project management solutions using SharePoint and .NET.
• Built SharePoint workflows and customizations for automated workflow handling.
• Delivered enterprise integration and ETL projects using C#, Oracle, Informix, SQL Server, and web services.
• Implemented data processing, validation, and reporting features.

A web-based system for issuing and managing building-related certificates, used by a government ministry responsible for construction, as well as by authorized professionals and citizens. It lets all three groups issue and manage building certificates online.

• Designed and developed a web-based certificate issuing and management system for a government ministry.
• Built business process management solutions for government using ASP.NET and SQL Server.
• Developed CRM features for a national telecom operator using ASP.NET and Oracle PL/SQL.

A desktop engineering tool for planning and implementing building automation and plant solutions. It’s used by engineers to design and set up automation systems for buildings and industrial plants.

• Developed a desktop engineering tool for planning and implementing building automation and plant solutions.
• Built the user interface with C#, .NET, and WinForms.
• Developed VBA-based automation and scripting features.

A hotel management system that the front desk, reservations, housekeeping, and management teams use to run daily hotel operations. It brings these teams’ work together in one system.

• Developed core framework components for a hotel management system.
• Built .NET user controls, forms, and reporting features for hotel staff.
• Wrote SQL Server 2005 stored procedures and queries.
• Worked with C# and .NET 1.1/2.0.