Senior Software Engineer – Android Systems, Security

PayJoy

. Develop and maintain custom modifications within the Android Framework (AOSP) and Hardware Abstraction Layers (HAL) .

Posted 10/12/2026full-timeSan Francisco • California • United StatesSenior💰 $268,700 - $275,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates extensive hands-on experience with AOSP development, including modifying system services and utilizing the Android build system. Proficient in Java, C/C++, and Kotlin, with a strong background in firmware customization and security hardening.

Highest-signal resume keywords

AOSP DevelopmentJava ProgrammingC/C++ ProficiencyFirmware CustomizationSecure Boot Experience

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

AOSP DevelopmentJava ProgrammingC/C++ ProficiencyKotlin KnowledgeFirmware CustomizationDevice Bring-UpSecurity HardeningPython AutomationBash ScriptingTelephony Integration

Soft Skills

Effective CollaborationCross-Time Zone Communication

Tools & Technologies

Android Build SystemSoongMakeQualcommMediaTekOTA UpdatesARM TrustZoneDevice Policy ManagerPower ManagementTelephony

Industry Keywords

OEMChipset VendorFirmwareSecurity MechanismsExploit Vectors

Tech Stack

Tools & technologies

AndroidJavaKotlinPythonC++

About the role

Key responsibilities & impact

Develop and maintain custom modifications within the Android Framework (AOSP) and Hardware Abstraction Layers (HAL)
Partner with global smartphone manufacturers and chipset vendors to integrate PayJoy’s proprietary technology into factory firmware
Work daily with the China-based engineering team to align on technical specifications and manufacturing requirements
Implement new locking features interacting with system-level services such as Telephony, Power Management, and Device Policy Manager
Use chip-level knowledge to troubleshoot integration issues across Qualcomm, MediaTek, and other silicon providers
Contribute to OTA updates and global device testing
Bridge high-level Android features with low-level hardware integration to ensure proprietary OS-level security mechanisms are robust, performant, and tamper-proof

Requirements

What you’ll need

Extensive, hands-on experience with AOSP development, including modifying system services and utilizing the Android build system (Soong/Make)
Expert-level proficiency in Java and C/C++ (JNI)
Ability to read/write Kotlin
Proven experience working with or for an OEM or chipset vendor on firmware customization, device bring-up, or security hardening
Demonstrable knowledge of AOSP and TEE / ARM TrustZone
Experience with Secure Boot, verified boot (AVB), and common Android exploit vectors
Experience automating firmware build pipelines and signing processes using Python or Bash
Comfort collaborating effectively with international teams across different time zones

Benefits

Comp & perks

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