Full Stack Developer (React, .NET)

About S4BT Group, S4BT Group is revolutionizing the €800+ billion global business travel market with P4BT – Payment for Business Travel (Ho Chi Minh based), an innovative fintech platform. Our modular, AI-powered, API-first infrastructure transcends traditional payment solutions by automating invoices, optimizing spend, ensuring compliance, and delivering actionable insights for leading travel buyers and suppliers. Join our founding technology team to build a cutting-edge platform from the ground up and shape the future of business travel. Key Responsibilities Design, develop, test, and maintain high-quality applications using .NET, React, HTML/CSS, SQL Server, and MongoDB. Collaborate with cross-functional teams to gather and analyze business requirements, architect solutions, and deliver optimal technical implementations. Author comprehensive technical documentation, including specifications and system designs. Write clean, maintainable, and efficient code, adhering to industry best practices and coding standards. Proactively identify, analyze, and resolve software defects and performance issues in a timely manner. Design, implement, and optimize database structures using SQL Server and MongoDB to ensure scalability and performance. Conduct unit testing to validate product quality and functionality. Participate in code reviews, providing constructive feedback to enhance team code quality.