Senior Android Developer — POS

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About SYSMNT

SYSMNT is a technology implementation partner building enterprise systems and digital platforms across the Kingdom. Our work spans retail, hospitality, fuel and energy, and services — sectors where the point of sale is the front line of the business, not an afterthought.
We're a lean team where engineers own their work end to end. If you like solving hardware-level problems and seeing them running in real stores rather than shipping features into a backlog, you'll fit here.

The Role

You'll own the Android POS layer of our retail platforms: the applications running on merchant terminals, the payment flows behind them, and the peripheral integrations that make them work. This is embedded, hardware-adjacent Android work with real constraints — limited memory, vendor SDKs that disagree with each other, and transactions that cannot silently fail.

Responsibilities

POS Application Development

Design, build, and maintain Android POS applications for Sunmi, PAX, and similar terminal families
Integrate device peripherals: thermal printers, card readers, barcode scanners, cash drawers, customer displays
Optimize for embedded environments with constrained memory, storage, and processing
Ensure the application behaves correctly across differing SDK versions and hardware revisions

Payments & Transaction Processing

Implement payment flows against EMV contact and contactless standards
Build and maintain transaction messaging over ISO-8583
Handle financial data securely and in line with PCI-DSS and SAMA requirements
Diagnose and resolve production transaction issues, including settlement and reconciliation mismatches
Integrate with mada, local acquirers, and payment gateways

Smart Card & NFC Integration

Offline & Sync Reliability

Design offline-first behavior so terminals keep transacting through connectivity loss
Build reliable sync and queuing back to backend systems once connectivity returns
Guarantee transaction integrity — no duplicates, no lost sales

Architecture & Code Quality

Design maintainable Android architectures in Kotlin and Java
Build reusable abstraction layers that isolate vendor SDK differences behind a common interface
Enforce coding standards, secure development practices, and meaningful code review
Lead technical design discussions and own solution architecture for the POS layer

Collaboration

Work with backend, QA, and product teams to deliver complete flows, not just the client side
Coordinate with terminal vendors, acquirers, and payment providers on integration and certification
Mentor junior developers and raise the technical bar across the team

Requirements

Bachelor’s degree in computer science, Software Engineering, or a related field
3–5 years of Android development experience, with meaningful time on POS or embedded devices
Hands-on experience with POS hardware SDKs (Sunmi, PAX, or equivalent)
Strong Kotlin and Java proficiency
Practical experience with EMV contact and contactless flows
Working knowledge of ISO-8583 message construction and parsing
NFC and APDU-level card communication experience
Familiarity with MIFARE, DESFire, and CPU card types
Solid grasp of Android architecture patterns, lifecycle behavior, and performance profiling
Comfortable debugging at the hardware boundary — logic analyzers, serial output, vendor logs
Good communication in English; Arabic is an advantage

Nice to Have

Experience with mada certification or working through acquirer certification cycles
ZATCA e-invoicing (Fatoora Phase 2) integration experience
Arabic RTL interface development, including receipt printing in Arabic
Backend familiarity (REST APIs, message queues) for end-to-end ownership
Fuel retail, restaurant, or multi-branch retail POS background
Experience with device fleet management and remote OTA updates
PCI-DSS or secure payment development exposure

What We Offer

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