Technologies-expected : C#. NET Core. NET Graph QL Hasura SQL about-project : Contribute to a global business payments and spend management program focused on delivering innovative customer self-serve capabilities. Join a dynamic development team responsible for maintaining and enhancing digital systems, including customer portals, transaction processing systems, and other tools that provide seamless digital experiences. Your work will directly impact product development velocity and technical excellence. Contract (long-term): B2 B or Contract of employment Location: Remote within Poland Project: A global business payments and spend management system. Key Technologies: - C#,. NET Core -. NET microservices - Java Script, Type Script, React - Graph QL, Hasura - SQL Databases responsibilities : Collaborate with the development team to deliver high-quality software solutions aligned with product roadmaps. Develop and improve backend systems using. NET Core and. NET Microservices, with a focus on SQL database management and optimization. Design, develop, and maintain React-based frontend applications, ensuring robust and flexible component-based designs. Enhance middleware using Graph QL and Hasura, implementing creative solutions to optimize performance under licensing constraints Address backend challenges such as SQL replication and database growth, supporting the expansion of the system to new use cases. Contribute to continuous improvement initiatives, including mono-repo implementation, unit testing, and cultural/language-specific enhancements. Participate in brainstorming and collaborative decision-making to propose and evaluate technical solutions. Provide additional support for frontend development during peak demands to ensure project delivery. requirements-expected : Min. 4 years of experience as a Full-stack Developer, ideally with a backend focus. Expertise in. NET Core,. NET Microservices, and SQL database design and optimization for large-scale applications. Strong experience in React for building scalable and maintainable user interfaces. Excellent problem-solving skills and a proactive approach to technical challenges. Experience with SQL database replication and performance optimization. Strong communication skills and ability to thrive in a collaborative, fast-paced development environment. Familiarity with Graph QL and Hasura; ability to find creative solutions in resource-constrained environments is a plus. Fluency in Polish and advanced level of English (B2/C1). offered : Stable, long term, full-time collaboration. Remote work within Poland and flexible working hours. High engineering culture with a focus on growth and learning. Multinational teams. Benefits: Private medical care, Multisport card, and workation (work for a week from Barcelona or elsewhere). benefits : sharing the costs of sports activities private medical care remote work opportunities integration events