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
