Senior Software Engineer - Android Systems & Security

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!

Additional Information

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. PayJoy is proud to be an Equal Employment Opportunity employer and we welcome and encourage people of all backgrounds. We do not discriminate based upon race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics. PayJoy Principles Finance for the next billion * Ownership * Break Through Walls * Live Communication * Transparency & Directness * Focus on Scale * Work-Life Balance * Embrace Diversity * Speed * Active Listening

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