POS Terminal Developer

Job title : POS Terminal Developer

About the role

• You will build the software that runs on POS and embedded terminal devices — the application a merchant touches when they take a payment. It has to work on constrained hardware, over unstable networks, with device peripherals, and it has to be certain whether a transaction went through.
• If you have built Android applications that integrate hardware SDKs and survive a dropped connection mid-transaction, this is your role.

What you will do

• 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 implement 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 where the outcome of an operation is uncertain.
• Ensure repeated user actions and communication failures never cause duplicate processing.
• Build comprehensive 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.
• Participate in testing, quality assurance and certification activities.

Requirements

• Strong Android development, with strong Java and/or Kotlin.
• Experience integrating hardware or device SDKs — the part that is hard to learn on the job.
• REST API integration; application lifecycle and state management; network communication and error handling.
• Secure local-storage and application-security practice.
• Git, debugging, and an understanding of software release and version management.