Sr. Fullstack Developer (.NET/ React)

About the CompanyWe are helping one of our clients, an international technology company, grow its R&D team in Portugal. The team works closely with a global fintech and insurance technology business, developing and evolving an AI-powered platform used by enterprise customers across international markets. The engineering environment combines complex systems, real-time processing and high-load requirements, giving experienced developers the opportunity to work on technically demanding solutions at scale.About the roleWe are looking for a senior .NET Developer with strong experience in React, C#, and Azure to join a dynamic team working on modern, cloud-based applications.In this role, you will contribute to the development of scalable, high-performance systems, supporting both internal platforms and customer-facing solutions. You will be involved in the full development lifecycle, from design through to deployment and optimisation, while collaborating with cross-functional teams in an international environment.This is a great opportunity for someone who enjoys working with modern Microsoft technologies and frontend frameworks and wants to grow within complex, cloud-native environments.Key ResponsibilitiesDevelop and maintain React-based web applications and internal toolsBuild clean, efficient, and scalable backend services using C# and .NETImplement cloud-native solutions on Azure (App Services, Functions, DevOps pipelines, SQL, etc.)Collaborate with Product, QA, and other stakeholders to deliver high-quality featuresOptimise application performance, reliability, and securityParticipate in code reviews and contribute to technical improvementsTroubleshoot and resolve technical issues across the stackAdapt quickly to changing priorities and project needsRequirements5+ years of experience with C# / .NET developmentat least 2-3+ years of hands-on experience with React and modern JavaScript (ES6+)1 + year experience with Azure DevOps (CI/CD pipelines, repositories, boards)Experience working with Azure Cloud services (App Services, Functions, Storage, etc.)Solid understanding of SQL (Azure SQL, query optimisation, schema design)Ability to work in fast-paced, agile environmentsStrong problem-solving skills and attention to detailFluent English (written and spoken), Portuguese is nice to haveNice to HaveExperience with Azure Functions, Azure Service Bus (Topics), Azure API Management (APIM) or Power AppsThe company is offering a competitive salary package together with a comprehensive benefits and wellbeing programme, including health insurance, meal support and additional employee allowances. The role follows a hybrid working model in Lisbon, combining flexibility with regular collaboration with the local R&D team.You will join a dynamic, international engineering environment, working alongside experienced R&D colleagues on complex, evolving products and challenging technical problems. The company also supports continuous learning and professional development, providing an environment where developers can deepen their expertise, exchange ideas and grow professionally.