--- title: 'Senior Software Engineer - Android Systems & Security at PayJoy' canonical: 'https://feeny.ai/job/senior-software-engineer-android-systems-security-payjoy-san-francisco-6twgerncr57w' type: 'job' last_seen: '2026-09-07' --- # Senior Software Engineer - Android Systems & Security at PayJoy - **Company:** PayJoy - **Location:** San Francisco, CA - **Compensation:** $269k–$275k - **Employment:** full-time - **Work type:** hybrid - **Posted:** 2026-06-01 - **Last confirmed live:** 2026-09-07 - **Apply:** https://jobs.lever.co/payjoy/92f90381-e13e-477f-ac13-eb140d655483 ## Job description ## 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 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 ## About PayJoy ## Company Overview - **One-liner**: PayJoy provides secured phone financing and cash loans to underserved customers in emerging markets, using patented technology to enable credit access without a bank account or credit history. - **Entity Type**: Private (Public Benefit Corporation) – Total funding $635.6M across 14 rounds. - **Headquarters**: San Francisco, California, United States (with regional hubs in Africa, Asia, and Latin America) - **Founded**: 2015 - **Founders**: Doug Ricket ## Core Business - **Primary industry**: Financial Services (Fintech – secured consumer credit) - **Target customers**: B2C (underbanked individuals in emerging markets) and B2B (retailers offering point-of-sale financing) - **Mission**: Bring financial access to emerging markets, helping customers achieve financial stability and success. As a Public Benefit Corporation, PayJoy is legally committed to customer financial well‑being. ## Products & Services - **Phone Financing**: Pay‑as‑you‑go smartphone financing with no accruing interest, fixed transparent pricing, and no late fees. Customers need only an ID – no bank account or credit history required. - **Cash Loans**: Credit offerings for micro‑entrepreneurs and as insurance for tough times, with flexible payments and no penalty for being behind. ## Market Standing - **Valuation**: Not publicly disclosed - **Key Metric**: Annual revenue of $320M (LinkedIn estimate); Total funding $635.6M - **Notable Investors/Partners**: Not explicitly listed in provided sources, but the company has raised 14 funding rounds and operates in 9 countries across 3 continents. - **Growth Signals**: 20M+ customers served, nearly $4B lent, 909 employees (+46.4% YoY), carbon neutral since 2022, active in 9 countries (including Mexico, Brazil, Peru, South Africa, India). ## Competitive Advantages - Patented secured‑credit technology that enables lending without traditional credit history. - No accruing interest, no late fees, and no penalty for missed payments – differentiates from predatory lenders. - Public Benefit Corporation status legally commits the company to customer financial well‑being. - Advanced machine learning, data science, and anti‑fraud AI for credit scoring. - Deep operational presence on the ground in multiple emerging markets. ## Strategic Focus - Scale global impact by expanding into new countries and deepening existing markets. - Use data and AI to improve credit access and financial inclusion. - Maintain transparent, customer‑first lending practices while achieving profitability. - Continue hiring across engineering, data science, sales, and operations roles. ## Why Work Here - **Mission‑driven**: Work on products that directly improve financial well‑being for millions of underserved people. - **Culture**: Emphasizes transparency, directness, focus on scale, work‑life balance, and diversity. Employees rate culture 4.4/5 on LinkedIn. - **Remote/Hybrid**: Global team with offices in San Francisco, Mexico City, and regional hubs; many roles appear location‑specific (e.g., Mexico City, São José). - **Benefits**: Market‑competitive compensation, health & wellness benefits, parental leave, professional development funds, paid time off. - **Growth**: Rapidly growing company (46% headcount growth YoY) with opportunities to shape products and services from day one. ## Sources 1. [PayJoy Careers Page](https://www.payjoy.com/careers) 2. [PayJoy About Page](https://www.payjoy.com/about) 3. [PayJoy Homepage](https://www.payjoy.com/) 4. [PayJoy Jobs on Lever](https://jobs.lever.co/payjoy/) 5. [PayJoy LinkedIn Company Page](https://www.linkedin.com/company/payjoy) ## Other roles at PayJoy - [Sales Retail Development Specialist](https://feeny.ai/job/sales-retail-development-specialist-payjoy-quito-3sawsryaw5qg) — Quito, Ecuador - [Associate Operations Quality Support Specialist](https://feeny.ai/job/associate-operations-quality-support-specialist-payjoy-sao-paulo-n5fg2r4bkhse) — São Paulo, Brazil - [Sales Enablement Manager](https://feeny.ai/job/sales-enablement-manager-payjoy-jakarta-5g0dbkhry01x) — Jakarta, Indonesia - [Sales Operations Sr. Manager](https://feeny.ai/job/sales-operations-sr-manager-payjoy-mexico-city-ye8768pq305h) — Mexico City, Mexico - [Data Analyst Customer Experience](https://feeny.ai/job/data-analyst-customer-experience-payjoy-mexico-city-sqhmkx2xffpy) — Mexico City, Mexico - [Business Analytics Specialist](https://feeny.ai/job/business-analytics-specialist-payjoy-bogota-pfwjfpz7wgjd) — Bogotá, Colombia - [Senior Warranties Manager](https://feeny.ai/job/senior-warranties-manager-payjoy-mexico-city-qh4hrx25rdej) — Mexico City, Mexico - [Corporate Paralegal](https://feeny.ai/job/corporate-paralegal-payjoy-san-francisco-tjny9ydk02er) — San Francisco, CA - [Legal Intern](https://feeny.ai/job/legal-intern-payjoy-ecuador-cw12m34ygbp5) — Ecuador - [Executive Assistant to the General Counsel](https://feeny.ai/job/executive-assistant-to-the-general-counsel-payjoy-mexico-city-b8tvtm17n2rt) — Mexico City, Mexico