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: 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