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Kolomoni Microfinance Institution (Gambia) is a CBG-licensed microfinance institution serving customers across The Gambia. We are recruiting a Backend Engineer to build and maintain the services our products run on.
THE ROLE
You will design, develop, test, deploy and maintain secure, scalable backend applications — the business logic, APIs, integrations and data processing behind our customer-facing products. The work is judged on what survives production: correctness under load, safety under failure, and code the next engineer can maintain. You will report to the Chief Technology Officer.
WHAT YOU WILL DO
- Design and develop secure, scalable, maintainable APIs and application business logic in Java.
- Design database structures and data-access components, and optimise application and database interactions.
- Apply transaction and concurrency management, and idempotency where an operation must not run twice.
- Build applications that handle retries, duplicate requests and partial failures safely.
- Implement authentication, authorisation and application-security controls, and protect sensitive data in transit, at rest and in logs.
- Develop logging, monitoring and audit capability sufficient to reconstruct an incident.
- Write and maintain automated tests, participate in peer review, and resolve production defects.
Requirements
WHAT WE ARE LOOKING FOR
- Substantial hands-on experience building and maintaining production backend services in Java.
- Spring Boot or an equivalent framework, relational databases and SQL, and REST API design.
- Understanding of asynchronous and event-driven architecture, caching, and application security.
- Git, automated testing, containerisation and modern deployment.
- A first degree in computer science, engineering or a related discipline, or demonstrable equivalent experience.
- Experience in financial services or payments — where correctness under failure matters more than speed of delivery — is an advantage.
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