The Role
Design, build, and optimize Android POS applications for Sunmi and PAX devices. Implement secure payment flows (EMV, ISO-8583), integrate NFC/smart card standards (APDU, MIFARE, DESFire), handle peripherals (printers, card readers, scanners), and lead architecture, code quality, and cross-SDK reusable components. Mentor junior engineers and collaborate with product, QA, backend, and payment vendors.
Summary Generated by Built In
The Senior Android Developer (POS) is responsible for designing, developing, and optimizing Android - based Point
of Sale (POS) applications, with a strong focus on payment integrations and hardware interaction. The role
requires deep expertise in POS ecosystems (Sunmi & PAX), secure payment technologies, and smart card
integrations .
1. POS Application Development
- Design, develop, and maintain Android POS applications for Sunmi and PAX devices.
- Handle device - specific integrations including printers, card readers, scanners, and peripherals.
- Optimize application performance for embedded POS environments with limited resources.
- Ensure compatibility across different POS SDKs and hardware architectures .
2. Payment & Transaction Processing
- Implement and manage payment flows using EMV (contact & contactless) standards.
- Integrate transaction messaging using ISO - 8583 protocols.
- Ensure secure handling of financial transactions in compliance with industry standards.
- Troubleshoot and resolve transaction - related issues in production environments.
3. Smart Card & NFC Integration
- Develop and maintain integrations with prepaid utility cards.
- Work with:
NFC / APDU communication. - IFARE, DESFire, and CPU cards
- Ensure secure card communication and data handling.
- Optimize card reading performance and reliability.
4. Architecture & Code Quality
- Design scalable and maintainable Android architectures using Java & Kotlin.
- Enforce coding standards, best practices, and secure development principles.
- Conduct code reviews and ensure high - quality deliverables.
- Lead technical design discussions and solution architecture.
5. Cross - Platform & SDK Adaptation
Navigate and adapt to differences between Sunmi and PAX SDKs, including:
- Printing frameworks
- Card reader APIs
- Peripheral handling
- Build reusable components to standardize development across devices
6. Collaboration & Stakeholder Management
- Work closely with product, QA, and backend teams to deliver end - to - end solutions.
- Collaborate with external vendors and payment providers when needed.
- Provide technical guidance and mentorship to junior developers.
Requirements
- Bachelor’s degree in Computer Science, Software Engineering, or a related field.
- 3 - 5 years of Experience in a similar role.
- Proven hands-on experience with POS systems (Sunmi & PAX)
- Experience in payment integrations and fintech environments is highly preferred.
- Strong proficiency in Java with solid experience in Kotlin
- Hands-on experience with:
-EMV (contact & contactless)
-ISO-8583 messaging
-NFC / APDU communication
-MIFARE, DESFire, CPU cards
- Strong understanding of Android SDK, architecture patterns, and performance optimization
- Experience working with hardware-integrated applications
Skills Required
- Bachelor's degree in Computer Science, Software Engineering, or related field.
- 3-5 years of experience in a similar role.
- Proven hands-on experience with POS systems (Sunmi & PAX).
- Experience in payment integrations and fintech environments.
- Strong proficiency in Java and solid experience in Kotlin.
- Hands-on experience with EMV (contact & contactless).
- Hands-on experience with ISO-8583 messaging.
- Experience with NFC / APDU communication.
- Experience with MIFARE, DESFire, and CPU cards.
- Strong understanding of Android SDK, architecture patterns, and performance optimization.
- Experience working with hardware-integrated applications (printers, card readers, scanners, peripherals).
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The Company
What We Do
Al Ahly Momkn, a subsidiary of the National Bank of Egypt (NBE), is a fast-evolving fintech company delivering secure, scalable financial platforms and frictionless payment solutions. It is committed to promoting convenient financial services for business owners, service providers, and consumers across Egypt, enabling them to manage their financial operations independently and simplify financial management to ensure clarity, confidence, and effortless control over their money.
