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;
• Create quality technical documentation to support the engineering and product teams;
• Implement and enforce secure coding standards to safeguard against security vulnerabilities;
• Actively participate in SCRUM rituals;
• Participate in product planning and roadmap discussions;
• Guide and mentor junior engineers, helping them to up their game;
• Support continuous improvement by investigating alternatives and technologies and presenting these for architectural review;
• Document software designs decisions, APIs, and processes to support knowledge sharing and maintain technical clarity;
• Maintain publicly facing API documentation;
• Provide ongoing support and maintenance for existing applications, including bug fixes and performance enhancements.
  

Qualifications:

• 5+ years of hands-on experience designing, developing, and maintaining server-side applications using Java and/or Kotlin.
• Proven experience building and owning material components of large-scale financial systems, payment platforms, banking systems, or other mission-critical applications.
• Demonstrated experience designing and operating distributed systems, including understanding of scalability, reliability, fault tolerance, and performance optimization.
• Strong experience with data modeling, database architecture, and working with large-scale datasets and high-volume transactional data.
• Practical experience leveraging Artificial Intelligence (AI) tools and technologies within software development workflows, including improving engineering productivity, code quality, automation, or system capabilities.
• Proven ability to take end-to-end ownership of complex engineering initiatives, from architecture and design through implementation, deployment, and ongoing maintenance.
• Experience designing and developing microservices-based architectures and high-availability, low-latency systems.
• Strong proficiency with Java and/or Kotlin, including Spring Framework (Spring Boot, Spring MVC).
• Solid understanding of software architecture principles, design patterns, and engineering best practices.
• Experience implementing secure software solutions with a strong security-oriented mindset, particularly in environments handling sensitive financial or transactional data.
• Experience working with cloud platforms such as AWS or GCP.
• Experience with CI/CD pipelines, infrastructure automation, and modern software delivery practices.
• Proficiency with version control systems, particularly Git.
• Experience writing comprehensive unit, functional, and integration tests.
• Experience creating and maintaining technical documentation, API documentation, and software design specifications.
• Previous experience mentoring engineers, providing technical guidance, conducting code reviews, and helping improve engineering practices across a team.
• Strong problem-solving and analytical skills with the ability to operate effectively in a fast-paced startup environment.
• Excellent communication and collaboration skills, with the ability to work cross-functionally with Product, QA, Compliance, and other business teams.