Hire(d) better.
Hire(d) better.
Hire(d) better.
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.
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.
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.
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!
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The Senior Software Engineer - Android Systems & Security position at Payjoy is based in San Francisco, CA. This is an on-site position.
The Senior Software Engineer - Android Systems & Security position at Payjoy is a Full time role.
Key skills for the Senior Software Engineer - Android Systems & Security position at Payjoy include: machine learning, java, c++, kotlin, python.
