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PayJoy is a fintech company that expands access to smartphones and financial services through installment-based credit. Its buy now, pay later model enables customers in markets including Mexico, Panama, Peru, Ecuador, Brazil, Colombia, South Africa, and the Philippines to purchase smartphones over three to twelve months without relying on a credit card or traditional bank account. PayJoy also provides cash loans that can be approved through a smartphone, combining mobile technology with alternative financial access across fintech, telecommunications, and retail.
Senior Android Systems Security Engineer
Build and secure Android systems for PayJoy’s credit platform in emerging markets. Integrate protected firmware with smartphone manufacturers and chipset vendors.
United States
California$268,700 – $275,000 / year
HybridFull-timeSeniorEnglish RequiredAndroid EngineerSoftware EngineerDescription
- Customize the Android Framework (AOSP) and Hardware Abstraction Layers (HAL).
- Work with smartphone manufacturers and chipset vendors worldwide to integrate PayJoy technology into factory firmware.
- Coordinate technical specifications and manufacturing requirements with the China-based engineering team.
- Build device-locking features that use Telephony, Power Management, and Device Policy Manager services.
- Troubleshoot integration issues using chip-level knowledge across Qualcomm, MediaTek, and other silicon platforms.
- Support over-the-air updates and device testing worldwide.
- Connect Android features with hardware integration to keep OS-level security mechanisms robust, performant, and tamper-resistant.
Requirements
- Hands-on AOSP development experience, including system service modifications and the Android Soong/Make build system.
- Expertise in Java and C/C++ (JNI).
- Ability to read and write Kotlin.
- Experience at or with an OEM or chipset vendor in firmware customization, device bring-up, or security hardening.
- Knowledge of AOSP and Trusted Execution Environments (TEE) or ARM TrustZone.
- Experience with Secure Boot, Android Verified Boot (AVB), and common Android exploit vectors.
- Experience automating firmware build pipelines and signing processes with Python or Bash.
- Ability to collaborate effectively with international teams across time zones.
Benefits
- Benefits vary depending on the country of hire.
- Company-funded health insurance for employees and immediate family members.
- Company-funded life and disability insurance for employees.
- Paid vacation days and unlimited sick leave.
- Annual $2,000 USD co-working travel allowance.
- Annual $2,000 USD professional development allowance.
- Phone financing, a headphone benefit, home office equipment allowance, and wellness perks.
- Catered lunches.
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