Senior .NET Software Engineer (m/f)

We’re looking for a Senior .NET Software Engineer to join Aircash Development in Split. You’ll own complex backend problems from idea to production – designing and building the systems behind our products, writing clean, scalable code, and shipping features that reach millions of users across the EU. Split is a new Aircash Development location, not a separate engineering organization. Your team will work with the same standards, culture and ways of working as the rest of Aircash Development – one engineering organization, multiple locations. Key Responsibilities: - Own complex backend features end-to-end, from technical design and implementation to production monitoring and continuous improvement - Drive technical discussions, challenge solutions constructively, and help the team make pragmatic engineering trade-offs - Support and mentor other engineers, share knowledge and context, and help raise the engineering bar across the team - Take ownership when things go wrong in production – lead the investigation, fix the root cause and share what we learn - Work through ambiguity: turn unclear problems into clear technical solutions without waiting for a perfectly defined task - Design, develop, and maintain backend services and APIs using modern .NET technologies, writing clean, scalable code - Participate in code reviews and provide constructive feedback to peers - Collaborate closely with QA engineers to ensure comprehensive testing coverage and smooth deployments - Work alongside the product team to refine requirements and deliver features that exceed user expectations - Contribute to system monitoring, logging, and performance tuning to ensure system reliability and observability - Test, deploy, and monitor your work – your contributions will be immediately visible to users - Stay up to date with new technologies, concepts, and best practices in software development, and bring them to the team - Work with established development tools, guidelines, and conventions, including: - Web development using .NET Core or .NET Framework - Relational databases (MSSQL) and Object-Relational Mapping (ORM) tools like Entity Framework (EF/EF Core) - Build and maintain integrations with NoSQL systems like Elasticsearch and cloud-based components, such as Azure Service Bus - Basic understanding of frontend frameworks, with AngularJS being a plus

- 5+ years of professional .NET development experience, with deep knowledge of .NET Core / .NET Framework - A track record of taking complex problems from requirements to production and owning the outcome, not just the assigned task - Experience making technical decisions, understanding trade-offs, and challenging solutions constructively - Experience mentoring less experienced engineers and sharing context, not just code - Comfort working through unclear requirements and taking initiative without waiting for tasks to be defined - Strong understanding of backend architecture patterns, microservices, RESTful APIs, and asynchronous -processing - Strong problem-solving skills and a proactive approach to tackling challenges - Familiarity with distributed systems, messaging platforms (e.g. Azure Service Bus), and event-driven architectures - Understanding of observability concepts (logging, tracing, metrics) and tools like New Relic, Seq, or similar - Excellent communication and collaboration skills to thrive in a team-oriented environment - Commitment to delivering high-quality, scalable solutions focusing on user satisfaction