React Frontend engineer

🚀 Role: React Frontend 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 front end React applications, connecting to a .NET 8.0 backend, 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.  

• Heavily rely on AI to quickly iterate and develop frontend solutions. 

• 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 Backend Engineers, QA, DevOps, Support and Product teams.  

Requirements

🧩 About You:  

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

2-3 years of experience in frontend React development. 

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

🛠️ Tools Proficiency:   

• Solid experience developing React based frontends. 

• Experience with companywide design systems, both in using them in your everyday development and also contributing to their development. 

• Experience in interacting with RESTful APIs 

• Attention to testing, namely experience using Jest for unit test. 

• Experience with React design patterns, State management, consuming RESTful APIs 

  Nice to havee:  

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

• Familiar with Git, CI/CD pipelines  

• Knowledge of .NET 8.0 (this is a frontend position, but you’ll be interacting with a .NET 8 backend) 

🤖 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