Senior Android Engineer (POS)

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 .

• 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 .
• 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.
• 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.
• 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.
• 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
• 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