.NET C# Software Engineer

🚀 Role: .NET C# Software Engineer (Medior/Senior) 

📍 Location: Lisbon (Hybrid)  

📅 Start Date: January 2026 

💰 Salary: Competitive with benefits 

Why Are We Hiring?  

As we continue to scale our expense management platform, we are looking for a talented Software Engineer to join our fast-paced and international engineering team. You will play a key role in modernizing one of our main products, through AI. This role is ideal for someone with a strong technical foundation who thrives in a collaborative and agile environment and loves to explore AI technology.  

💥 What Will You Do:  

• Designing, developing, and maintaining software applications using .NET 8, as part of an agile development team.  

• Design scalable systems and write robust, maintainable code following best practices for software development.   

• Contribute to architectural decisions and codebase improvements.  

• Help in modernizing the product through AI. 

• Ensure quality via unit testing, code reviews, and continuous integration.  

• Work closely with product managers and designers to bring product vision to life.  

• Participate in regular sprints and collaborate cross-functionally with QA, DevOps, Support and Product teams.  

🧩 About You:  

Bachelor’s degree in Computer Science, Engineering, or equivalent experience. 

4-5 years of experience in software development. 

 A team player with strong problem-solving skills and attention to detail.  

🛠️ Tools Proficiency:   

• Solid experience with implementation of REST APIs, .NET 8 C# and SQL Server. 

• Experience working in cloud environments, ideally Azure.  

• Proven knowledge of Microservices and Onion architecture with DDD principles is a plus.  

• Experience in various AI technologies usage and integrations is a plus. 

• Experience in the fintech industry (or similar) is a plus. 

• Familiar with Git, CI/CD pipelines, and container technologies is a plus  

🤖 Analytical skills and AI proficiency: all team members are expected to demonstrate strong analytical capabilities and make smart use of AI tools, whatever helps them work smarter and drive results in their role.  

🌍 Language Skills: fluent English, any other language is a plus 

Why Join Mobilexpense? 

We’re not a giant enterprise. We’re a growing B2B SaaS scale-up with 3,000+ customers and big ambitions. Here, you’ll be empowered to build, test, and own your growth engine—without red tape or layers of approvals. 

• Work with a diverse, international team (27 nationalities, 47% female representation) 

• Direct access to leadership, flat structure, high transparency 

• Offices in Belgium, Netherlands, Germany, Sweden, Portugal, and Romania 

• A clear mission: make life easier for finance teams, HR, and employees across Europe