About PayJoy PayJoy, a Public Benefit Corporation, is a mission-first credit provider dedicated to helping under-served customers in emerging markets to achieve financial stability and success. Our patented technology for secured credit provides an on-ramp for new customers to enter the credit system. Through PayJoy’s point-of-sale financing and card offerings, customers gain access to a modern quality of life.
PayJoy’s credit also allows our customers to seize opportunities as micro-entrepreneurs, and acts as insurance for tough times. Through our cutting-edge machine learning, data science, and anti-fraud AI, we have served over 18 million customers as of 2025 while achieving solid profitability for sustainable growth. This role This is not a conventional Android app development role (building applications for the Play Store).
We are seeking a specialized systems engineer focused on the heart of the operating system: AOSP (Android Open Source Project) and the TEE (Trusted Execution Environment). In this role, you will bridge the gap between high-level Android features and low-level hardware integration, ensuring our proprietary security mechanisms—which protect our assets at the OS level—are robust, performant, and tamper-proof.
Responsibilities
- Framework Engineering: Develop and maintain custom modifications within the Android Framework (AOSP) and Hardware Abstraction Layers (HAL).
- OEM Integration: Partner with global smartphone manufacturers and chipset vendors to integrate PayJoy’s proprietary technology into factory firmware.
- Cross-Border Collaboration: Work daily with our China-based engineering team to align on technical specifications and manufacturing requirements.
- Feature Development: Implement new locking features that interact with system-level services for example Telephony, Power Management, and Device Policy Manager, etc…
- R&D & Debugging: Use deep chip-level knowledge to troubleshoot integration issues across different silicon providers (Qualcomm, MediaTek, etc.).
- Process Automation: Contribute to OTA (Over-the-Air) updates and global device testing.
Requirements
- Android Internals Expertise: Extensive, hands-on experience with AOSP development, including modifying system services and utilizing the Android build system (Soong/Make) .
- Low-Level Language Mastery: Expert-level proficiency in Java and C/C++ (JNI) . (Ability to read/write Kotlin is expected, but core work remains at the system level) .
- OEM/Firmware Background: Proven experience working with or for an OEM or chipset vendor on firmware customization, device bring-up, or security hardening .
- Strong Core Skills: Demonstrable knowledge of AOSP and TEE / ARM TrustZone .
- ⚠️ Note: If your background is primarily focused on building consumer-facing commercial apps (e.g., banking, gaming, or general retail apps), this role will not be a match for your skillset . 🌟 Desirable Skills (Pluses):
- Experience with Secure Boot, verified boot (AVB), and common Android exploit vectors .
- Automation of firmware build pipelines and signing processes using Python or Bash .
- Comfort collaborating effectively with international teams across different time zones . 💬 Ready to solve complex engineering challenges that almost no one else in the industry is tackling? Apply directly or send me a DM. Let's chat!
Benefits
- Local benefits depending on the country of hire
- Company-funded health insurance for employee and immediate family
- Company-funded employee life and disability insurance
- Paid vacation days, unlimited sick leave
- $2,000 USD annual Co-working travel perk
- $2,000 USD annual Professional Development perk
- Phone finance, headphone benefit, home office equipment allowance and wellness perks
- Catered lunches