11/11/2026 updated
100 % available
Lead .NET Developer at GiftAnew Core | APIs & Databases
Zagreb, Croatia
Only remote
University of Zagreb, FER — MSc Computing (2022); BSc Computing (2020)About me
I'm Renato Uštar, lead developer at GiftAnew Core d.o.o., a software company in Zagreb, Croatia. You work directly with me on C#/.NET APIs, databases and debugging, backed by 10+ years of .NET experience. We agree the scope and acceptance criteria before work begins.
ASP.NETApplication Programming Interfaces (APIs)C Sharp (Programming Language).NET CoreSQL Optimization
I help teams with C#/.NET applications, API integrations, database performance and software testing. I am Renato, based in Zagreb, Croatia, with more than 10 years of .NET experience. We can start with one focused paid milestone and clear acceptance criteria.
My experience includes Software Engineer at SQA Consulting SEE (April 2025–present), electronic invoicing work at Elektronicki racuni (March–April 2025), and Full Stack .NET Developer at mStart Plus (April 2022–March 2025). I hold a Master of Science in Computing from the University of Zagreb, FER (2022), and a Bachelor in Computing (2020).
My core technologies include C#, .NET, ASP.NET Core, APIs, Microsoft SQL Server and PostgreSQL. I work remotely in English and Croatian.
At GiftAnew Core I am developing three products:
• Anew Verify — code-quality checks for coverage, security findings and mutation testing; GitLab/GitHub configuration generation is planned.
• Anew Stores — ecommerce catalogue, prices and stock across multiple stores, with separate data and permissions.
• Anew Mail — email aliases and delivery rules across domains; Google Workspace and Microsoft 365 integrations are planned.
All three are in development, not completed client deliveries.
Experience
Professional experience10+ years
Freelancer since2026
Languages
EnglishFluentCroatianNative speaker