Overview

Expleo is 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.

This role is fully onsite in Nenagh, Co. Tipperary.

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.

Essential skills

Strong analytical skills, attention to detail and methodical approach to debugging and problem resolution.
Effective verbal and written communication; able to prepare technical artefacts for certification and present technical trade-offs to stakeholders.

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.

Benefits

At Expleo, we are committed to providing a competitive salary and substantial benefits offering with unique wellbeing, financial and employee recognition programmes.

We pride ourselves on our diverse and inclusive culture and offer a variety of family friendly policies and enhanced leave to help you achieve a healthy work life balance.

By providing significant learning and development opportunities, we encourage individual growth and success throughout your career with us.

Collaborative working environment – we stand shoulder to shoulder with our clients and our peers through good times and challenges
We empower all passionate technology loving professionals by allowing them to expand their skills and take part in inspiring projects
Expleo Academy - enables you to acquire and develop the right skills by delivering a suite of accredited training courses
Competitive company benefits such as medical and dental insurance, pension, life assurance, employee wellbeing programme, sports and social events, birthday hampers and much more!
Always working as one team, our people are not afraid to think big and question the status quo.

“We are an equal opportunities employer and welcome applications from all suitably qualified persons regardless of their race, sex, disability, religion/belief, sexual orientation or age”.

At Expleo, we understand that many people experience impostor syndrome throughout their lifetime, please do not let this discourage you from applying for this role. Our Talent Acquisition Team welcomes all CV’s and will consider your application in line with the values, requirements and role competencies.

Senior Android Developer - Payments Experience - Nenagh Based

Benefits

Job Description