Advisor, Software Development Engineering

Responsibilities

• Design, develop, and maintain Android applications for point-of-sale terminals , delivering clean, secure, and maintainable Java/Kotlin code.
• Build solutions for embedded Android and AOSP-based POS devices , including PAX terminals and similar hardware platforms.
• Integrate with POS hardware and SDKs, including card readers, PIN pads, NFC/contactless modules, EMV readers, printers, and peripherals .
• Implement and validate payment transaction flows , including authorisation, settlement, reversal, refunds, and offline-capable scenarios .
• Ensure correct handling of EMV chip, contactless/NFC, and magnetic stripe transaction processing.
• Support and drive payment certification activities with major card schemes and acquirers, including Visa, Mastercard, American Express , and others.
• Prepare certification artefacts, execute test suites, analyse logs, and address audit findings or remediation requirements.
• Contribute to the legacy transformation programme by refactoring and migrating older payment codebases to modern architectures, modular services, and secure SDK-based implementations.
• Preserve backward compatibility and minimise disruption to customers and live services during transformation activities.
• Implement secure coding practices and support compliance with PCI , PCI PTS , and EMV-related security requirements .
• Collaborate with security and infrastructure teams on key management interfaces , secure data handling, and HSM-related integrations .
• Profile and optimise application performance, including startup time, memory usage, transaction speed, and reliability .
• Improve observability and diagnostics by adding telemetry, logging, and support-friendly troubleshooting capabilities.
• Build and maintain automated build, test, and release pipelines for terminal applications and device images.
• Support automated regression testing , device farm execution, and CI/CD processes for mobile and embedded applications.
• Drive root cause analysis for production defects and critical incidents, and participate in post-release reviews and remediation planning.
• Review code, mentor peers, and collaborate closely with QA leads, programme managers, architects, and product owners to align delivery priorities.
• Primary objectives:
• Deliver high-quality Android POS applications for multiple device families, including PAX , that meet functional, security, and performance expectations.
• Successfully complete payment certification cycles with major card schemes and acquirers, achieving approval with minimal rework.
• Advance the legacy transformation programme by migrating key components to modern, maintainable implementations while minimising disruption to services.
• Reduce production defects and improve incident resolution times through better testing, telemetry, and automated quality checks.
• Ensure software is compliant, supportable, and reliable in live production environments.
• What you will need to have:
• 10+ years of experience in Android software development, with strong expertise in Java and Kotlin .
• Bachelor's degree in Computer Science, Engineering, or equivalent practical experience .
• Strong hands-on experience developing applications for embedded Android / AOSP-based POS devices .
• Proven experience with POS device SDKs and hardware integration , including card readers, PIN pads, NFC/contactless, EMV readers, printers, and peripherals.
• Experience with PAX devices and SDKs is highly desirable.
• Deep understanding of payment termin

Additional Information

Calling all innovators - find your future at Fiserv. We're Fiserv, a global leader in Fintech and payments, and we move money and information in a way that moves the world. We connect financial institutions, corporations, merchants, and consumers to one another millions of times a day - quickly, reliably, and securely. Any time you swipe your credit card, pay through a mobile app, or withdraw money from the bank, we're involved. If you want to make an impact on a global scale, come make a difference at Fiserv. Job Title Advisor, Software Development Engineering What does a successful Senior Android Payments Developer do? We are seeking an experienced Senior Android Payments Developer to lead the development of card acceptance applications on POS devices and play a significant role in a legacy modernisation programme . The ideal candidate will design and implement robust, secure Android software for payment terminals, including PAX devices , and work closely with QA, product, and programme teams to deliver high-quality payment solutions. This role requires strong expertise in Android development using Java and Kotlin , hands-on experience with embedded/AOSP-based POS devices , and deep knowledge of payment terminal flows, EMV, contactless processing, and certification with major card schemes . The successful candidate will also contribute to transforming legacy payment applications into modern, maintainable, and scalable solutions while ensuring compliance, reliability, and performance.

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