Senior Back-End Engineer

About Us: Payall Payment Systems is a dynamic and rapidly growing fintech startup focused on revolutionizing cross-border payments. Our mission is to provide seamless, secure, and innovative payment solutions for businesses worldwide. As we continue to scale, we are seeking a talented Senior Back-End Engineer to help build and maintain scalable, high-performance systems that power our products. Position Overview: As a Senior Back-End Engineer, you will play a critical role in designing, developing, and maintaining the core backend systems that drive our platform. You will collaborate closely with cross-functional teams to develop innovative solutions, ensure system reliability, and support business growth. This role requires a hands-on developer who thrives in a fast-paced startup environment. You will be expected to take full ownership of delivery of new functionality or removal of defects all the way through the development process. Key Responsibilities: Architect, implement and deploy high-performance, multi-tenant services; Integrate with 3rd party services; Perform code reviews to ensure code quality, maintainability, and adherence to best practices; Write unit, functional and integration tests covering your code: Work closely with product managers, designers, and QA to deliver top-notch products: Involve in full software development lifecycle from concept to deployment, including maintenance; Contribute to CI/CD pipelines and optimize workflows for better efficiency; Cr