POS Terminal Developer

About the role

Kolomoni Microfinance Institution (Gambia), a subsidiary of CapitalSage Holdings, is looking for a POS Terminal Developer for its technology team in Ibadan. You will build the software that runs on POS and embedded terminal devices, the application a merchant uses to take a payment. It must work on constrained hardware, over unstable networks, with device peripherals, and reliably confirm whether a transaction succeeded.

Key responsibilities

• Design, develop and maintain applications for supported terminal devices using Android with Java and/or Kotlin.
• Integrate terminal and device SDKs, hardware and peripherals.
• Integrate with backend APIs and ensure reliable communication between terminal and remote systems.
• Build secure device authentication and activation, and secure local storage.
• Design for unstable or limited network conditions: timeouts, retries, recovery and status verification.
• Ensure repeated user actions and communication failures never cause duplicate processing.
• Build application and device logging, and support versioning, updates and release management.
• Optimise for terminal hardware and resource constraints, and resolve device-integration and production issues.
• Take part in testing, quality assurance and certification activities.

Required profile

• Strong Android development experience.
• Experience integrating hardware or device SDKs.
• Understanding of REST API integration, application lifecycle and state management, and network communication and error handling.
• Knowledge of secure local-storage and application-security practices.
• Git, debugging, and an understanding of software release and version management.