Responsibilities
- Develop and maintain Android POS applications (Java/Kotlin) for embedded/AOSP devices, integrating with payment hardware (card readers, NFC, EMV, printers) using SDKs (e.g. PAX). Implement end-to-end payment flows (authorisation, settlement, reversal, offline) with full EMV/contactless support.
- Lead certification and compliance activities (Visa, Mastercard, Amex), ensuring PCI/PTS and secure coding standards, and working with security/HSM teams on key management.
- Modernise legacy payment systems into modular, secure architectures with minimal customer impact. Optimise performance, add telemetry, and support observability.
- Build and maintain CI/CD pipelines, automated testing, and release processes. Collaborate across teams, review code, and support incident analysis and continuous improvement.
Qualifications & Skills
- Degree in Computer Science or related field.
- Strong analytical, debugging, and communication skills.
Experience
- Strong hands-on Android development experience (Java and Kotlin) on embedded/AOSP variants used in POS devices.
- Proven experience with POS device SDKs and hardware integration—experience with PAX devices highly desirable.
- Deep understanding of payment terminal flows, EMV transaction lifecycle, contactless/NFC processing.
- Familiarity with payment scheme certification processes (Visa, Mastercard, Amex).
- Awareness of PCI DSS, PCI PTS and EMV kernel behaviours; understanding of secure key management and HSM interactions.
- Experience with automated testing and CI/CD for mobile/embedded applications.
- Proficient with modern toolchains: Android Studio, Gradle, Git; experience with Jenkins/GitLab CI/Azure DevOps.
- Competence in debugging on physical devices, handling serial/USB/Bluetooth/NFC communications, and analysing logs from constrained environments.
- Experience in the payments domain (e.g. Nexo Standards, EMVCo, PCI/PTS compliance) is highly desirable.
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