Senior POS Developer contract

E-Frontiers; The Municipal District of Nenagh; On-site; GBP 51,921 - 69,228; Full time

Job summary

A technology solutions provider is seeking a Senior POS Developer to lead the development of Android applications for payment terminals in Nenagh. This onsite role requires expertise in integrating hardware, ensuring compliance with payment certification standards, and optimizing legacy systems. Candidates should have a Bachelor's degree in Computer Science or a related field, alongside strong skills in Java and Kotlin. It's an exciting opportunity to drive innovations in payment solutions for a major client.

Qualifications

• Experience with Android application development.
• Knowledge of payment systems and compliance standards.
• Familiarity with POS hardware and SDKs, particularly PAX.

Responsibilities

• Design and implement Android applications for payment terminals.
• Integrate with POS hardware and validate drivers and SDKs.
• Prepare artefacts and coordinate payment certification activities.

Skills

Java

Kotlin

Legacy code transformation

Payment certification processes

NFC/contactless integration

Education

Bachelor's degree in Computer Science or Software Engineering

Job description

Job Title: Senior POS Developer - Nenagh Based

Overview

Our client 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

• 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.
• 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.