Mid-Level .NET Developer

NSYS Group

• IT

Mid-Level .NET Developer

We are an international IT company developing high-tech products in the field of mobile electronics. Our solutions are used in 80 countries worldwide. We are shaping the future of software development for the mobile electronics market. We are looking for an experienced Facebook Ads specialist to join our team in Belgrade on a part-time basis. We offer stable office-based work with opportunities for professional growth and development in the fast-growing digital advertising industry.

Requirements

-Production experience with .NET (C#)
-Experience building backend services, APIs, or service-oriented applications
-Understanding of HTTP APIs and basic data exchange patterns
-Experience working with relational databases or structured data storage
-Comfortable using Git and participating in code reviews
-Ability to debug and troubleshoot issues in production systems Nice to have (not required on day one)
-Experience with ASP.NET Core
-Familiarity with cloud environments or containerized deployments
-Performance tuning or scalability work in production systems
-Experience working with data processing or operational workflows
-Exposure to systems that integrate with hardware or external devices
-Experience in multi-team or multi-product environments

Key responsibilities

-Backend and service-side components supporting device testing and grading workflows
-Business logic and APIs used by iOS, Android, desktop applications, and robotics systems
-Improving reliability, performance, and maintainability of existing .NET services
-Supporting new product development while helping stabilize and evolve current solutions
-Collaborating closely with mobile, desktop, backend, and hardware-focused engineers -You may occasionally help investigate production issues or support existing customers, but this is not a support-only role – the focus is on building and improving core systems.

What the company offers

– International IT project
– Accredited IT company
– Work in a company focused on long-term collaboration
– Flexible start of the working day
– Comfortable office
– Base salary + bonus per vacancy closed (performance affects not only the bonus but also the base salary)
– Cozy kitchen; our chef prepares hot lunches for you
– Official employment, assistance with residence permit and work permit

Additional Information

How we work -Cross-functional teams spanning mobile, desktop, backend, and hardware domains
-Pragmatic engineering focused on reliability, clarity, and long-term maintainability
-Shared responsibility for product quality without constant firefighting
-Mentorship, code reviews, and scope adjusted to experience level Why this role
-This role is a good fit if you enjoy working on real-world systems that connect software to physical processes, value clear ownership and steady growth, and want to deepen your backend expertise.