Senior Back-End Engineer

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.