Jobless Developer
PayJoy logo
PayJoy

Posted 4 months ago

Open

Staff Software Engineer - Origination

San FranciscoOn-siteFull-time

AI Summary

Staff Engineer leads the Merchant platform’s technical foundation, designing and evolving UI, APIs, and data systems at scale. Hands-on role mentoring engineers and driving cross-team architectural decisions.

About this role

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

The Staff Engineer leads the technical foundation of our Merchant organization, shaping how our user interfaces, APIs, and data systems evolve as we scale. This role is deeply hands-on: designing end-to-end application flows, modernizing service patterns, mentoring engineers, and driving cross-team architectural decisions that influence the entire platform. Responsibilities

Responsibilities

  • Solve Critical Product & Platform Problems Identify and prioritize issues across UI layers, service boundaries, and data
    flows. Deliver solutions that improve performance, reliability, and developer experience.
  • Architect & Build Scalable Application Components
  • Design and implement robust APIs, backend services, and data models. Introduce modern frameworks and patterns that other engineers can adopt across the organization.
  • Lead Cross-Functional Engineering Initiatives. Partner with product, design, and engineering teams to define systemwide
    solutions. Ensure UI, API, and database layers work cohesively and meet business and technical standards.
  • Mentor & Develop Engineering talent guide engineers through code reviews, pair programming, and architectural discussions. foster a culture of learning, quality, and thoughtful technical decision-making.
  • Continuously Improve the Platform and evaluate existing systems, identify gaps, and drive modernization efforts
    across frontend frameworks, service architecture, and data infrastructure requirements

    • Requirements

  • Education & Experience
    Bachelor’s degree in computer science, software engineering, or related field.
  • 12+ years of experience building and scaling production systems in high-growth environments.
  • UI, API, and Backend Expertise
  • Strong proficiency in designing and implementing RESTful or event-driven APIs.
  • Experience building user interfaces or frontend components that integrate with complex backend systems.
  • Deep understanding of backend development in languages such as Java, Python, PHP, or similar.
  • Database & Data Modeling Skills, hands-on experience with relational and NoSQL databases, schema design, query optimization, and data integrity patterns.
  • Distributed Systems & Architecture solid understanding of system design, scalability, and distributed systems fundamentals.
  • Experience with cloud platforms such as AWS, GCP, or Azure.
  • Strong communication skills with the ability to explain technical concepts to non-technical stakeholders.
  • Demonstrated ability to lead through influence, collaborate across teams, and mentor engineers at all levels.
  • Bonus Experience
    Exposure to mobile technologies, mobile payments, or fintech systems involving fraud, identity, or high-volume transaction processing. Experience building or maintaining large-scale systems used by millions of users.

    • Benefits

  • 100% Company-funded health insurance for employee and immediate family
  • Company-funded employee life and disability insurance
  • 20 Paid vacation days, Flexible sick leave
  • $2,000 USD annual Co-working Travel perk
  • $2,000 USD annual Professional Development perk
  • Headphone benefit, home office equipment allowance and wellness perks
  • $340 Company-funded Commuter benefit
  • Catered lunches

    • Skills

    API DesignAPIsArchitectural PatternsBackend ServicesCloud (AWS/GCP/Azure)Code ReviewsData InfrastructureData ModelingDistributed SystemsEvent-driven DesignFrontend UI ComponentsJavaMentor Engineering TalentNoSQLPair ProgrammingPythonRelational DatabasesREST APIService Modernization

    Explore related jobs

    More jobs at PayJoy

    Similar API Design jobs

    Jobs in San Francisco

    Browse these categories

    API Design JobsAPIs JobsCode Reviews JobsData Modeling JobsDistributed Systems Jobs