Full Stack Engineer

Listed as a remote role based in European Union. BUILD NEXT-GENERATION DIGITAL PAYMENT SOLUTIONS | FULL STACK DEVELOPER (.NET & REACT) Location: Fully Remote (Europe) Contract: Freelance Duration: Initial 6-month contract with a strong likelihood of extension Language: English We're partnering with one of the world's leading digital payments and financial technology organisations, powering secure, seamless transactions for businesses and consumers across more than 200 countries and territories. As part of a growing international engineering team, they're looking for a Mid-Level Full Stack Developer to help build, enhance and maintain modern, scalable applications that support business-critical platforms used by millions of people worldwide. This is an excellent opportunity to work on innovative technology within a collaborative, Agile environment while enjoying the flexibility of a fully remote freelance contract. Key Responsibilities: Design, develop and maintain modern full stack applications using .NET and React . Build scalable, secure and high-performing software solutions following industry best practices. Develop and optimise backend services and RESTful APIs. Design, develop and maintain PostgreSQL databases, ensuring performance and reliability. Collaborate with product owners, architects and fellow engineers to deliver high-quality software. Participate in Agile ceremonies, code reviews and sprint planning. Troubleshoot, test and optimise applications to improve performance and user experience. Contribute to continuous improvement initiatives and software engineering best practices. Essential Skills & Experience: 3–5 years' commercial experience as a Full Stack Developer . Strong experience developing applications with .NET (C#) . Commercial experience building modern front-end applications using React . Strong knowledge of PostgreSQL and relational database design. Experience developing and consuming RESTful APIs. Good understanding of object-oriented programming and software engineering principles. Experience using Git and working within Agile development teams. Strong problem-solving skills and a collaborative approach. Fluent English is essential. Nice to Have: Experience working within financial services, FinTech or enterprise-scale environments. Experience with cloud platforms such as Microsoft Azure, AWS or Google Cloud Platform. Knowledge of CI/CD pipelines, Docker or Kubernetes. Experience with automated testing frameworks. Exposure to microservices architectures. What's on Offer: Fully remote working from anywhere in Europe. Initial 6-month freelance contract with a strong likelihood of extension. Opportunity to work on high-profile, enterprise-scale digital products. Collaborative international engineering team. Exposure to modern technologies and large-scale software development. Competitive daily rate. 📩 Interested? Contact info@optimistech.co to learn more about this fantastic opportunity! Show more Show less Seniority level Mid-Senior level Employment type Contract Job function Finance and Information Technology Industries Financial Services and Software Development