Senior POS Developer – Android New

• Long Term Contract
• Daily Rate

Overview:

My client us seeking a Senior Android Payments Developer to lead the development of card acceptance applications on POS devices and play a key role in a legacy modernisation programme.

You will design and implement secure, high-performance Android software for payment terminals (including PAX devices), collaborate with QA, product and programme teams, and drive payment certification with major card schemes.

Responsibilities:

• Android POS Development
• Design and implement Android applications for POS terminals, delivering clean, maintainable Java/Kotlin code for embedded Android/AOSP-based devices.
• Integrate with POS hardware: implement and validate drivers and SDK integrations for card readers, PIN pads, NFC/contactless, EMV readers, printers and peripherals (experience with PAX SDKs expected).
• Implement payment flows: authorisation, settlement, reversal and offline-capable flows; ensure correct handling of EMV, contactless and magnetic stripe scenarios.
• Certification & Compliance
• Prepare artefacts, run test suites and coordinate payment certification activities with card schemes and acquirers (Visa, Mastercard, Amex).
• Address scheme audit findings and remediation promptly.
• Implement secure coding practices and support PCI and terminal security requirements (PCI PTS, EMV kernel considerations).
• Liaise with security and HSM teams on key management interfaces.
• Legacy Transformation
• Migrate and refactor legacy payment codebases to modern architectures (modularisation, services, secure SDKs), preserving backward compatibility and minimising customer impact.
• Performance & Observability
• Profile and optimise application performance, improve startup times and memory usage.
• Add telemetry and diagnostics to aid support and SRE teams.
• Automation & CI/CD
• Build and maintain automated build, test and release pipelines for terminal images and application packages.
• Support automated regression and device farm test runs.
• Collaboration & Mentoring
• Review peers’ code, share knowledge across the team, and work closely with QA leads, programme managers and product owners to align delivery priorities.
• Participate in post-release reviews and drive root-cause analysis for critical incidents.

Qualifications:

• Bachelor’s degree in Computer Science, Software Engineering, or a related field.