Principal Software Engineer - Payments

Software Engineering Santa Barbara, California Dallas, Texas San Diego, California United States


Hi, We’re AppFolio. 

We’re innovators, changemakers, and collaborators. We’re more than just a software company — we’re a cloud-based powerhouse that creates products to make our customers’ lives easier. We’re revolutionizing the way people do business, and we want your ideas, your enthusiasm, and your passion to help us keep on innovating.

We love where we work, and you can, too.

To find out more about what AppFolio has to offer, check out

What You’ll Do

Develop scalable and robust Payments infrastructure and user interface that simplifies our customers' payment flows while reducing risk and fraud.

Collaborate with a strong cross-functional team of engineers, product managers, and payments operations stakeholders to build a highly reliable and accurate, world-class payments platform.

Research, share, and recommend new technologies and trends that will help modernize our payments infrastructure.

Use test-driven development, code reviews, and continuous integration to deliver high-quality software, and rapidly fix bugs as they come up.

Work closely with, and incorporate feedback from other engineering team members, QA, and product owners.

Leverage agile practices in start-up mode, encourage collaboration, prioritization, and urgency to develop at a rapid pace.

What We’re Looking For

We are hiring an experienced Payments Software Engineer to be a major leader to our Payments Infrastructure development team. You will bring our platform to the next level with the goal of building a highly scalable, redundant platform while managing risk and mitigate financial fraud to help reduce AppFolio’s overall risk exposure.

Your responsibilities will include working with an engineering team to design, build, modernize, and maintain our highly scalable payments platform. You will integrate with our banking partners to enhance our platform and incorporate analytics to help identify opportunities for efficiencies and cost savings. You will analyze the impact of proposed architectural changes and work with our risk and fraud teams to help detect and investigate fraud across AppFolio’s entire suite of products.

This is an ideal opportunity for someone who has a passion for building leading-edge software and is driven to help build a successful SaaS product used by thousands of happy businesses. We foster an environment that empowers small teams to collaboratively set the technical direction of our solutions.


  • BS, MS, or Ph.D. in Computer Science or related technical discipline
  • 8+ years of software engineering experience, with at least 6 of those years spent working in a SaaS payments environment 
  • Experience building a payments system which processes billions of dollars each year
  • Deep understanding of payments system networks including card systems, ACH and checking 
  • Experience in risk management and the compliance domain
  • Proven experience working across all levels of the development stack
  • Strong familiarity with Agile software development processes: Scrum or Kanban
  • Strong familiarity with Test-Driven-Development
  • Creativity, ability to solve complex problems without a roadmap
  • You love learning about new technologies, but understand the value of continuing to use something old if it still does everything you need it to do
  • You care about the long-term maintainability of the codebase and will learn to advocate for refactoring and clean-ups where appropriate
  • You care about work-life balance and want your company to care about it too; you'll put in the extra hour when needed but won't let it become a habit


  • Experience building streaming systems with large amounts of data and complex aggregation logic
  • Experience deploying machine learning models at scale
  • Experience working on a fraud detection and prevention system
  • Experience with some areas of our tech like Ruby on Rails, React, Redux, AWS, SOA

Our Story

AppFolio (NASDAQ: APPF) was founded in 2006 with the mission to revolutionize vertical industry businesses by providing great software and service. Our easy-to-use, cloud-based software helps our customers more effectively market, manage, and grow their businesses. Our software solutions exist in the real estate vertical, including AppFolio Property Manager and AppFolio Investment Management.

To find out more about what AppFolio has to offer, check out

Statement of Equal Opportunity

At AppFolio, we value diversity in backgrounds and perspectives and depend on it to drive our innovative culture. That’s why we’re a proud Equal Opportunity Employer, and we believe that our products, our teams, and our business are stronger because of it. This means that no matter what race, color, religion, sex, sexual orientation, gender identification, national origin, age, marital status, ancestry, physical or mental disability, or veteran status, you’re always welcome at AppFolio.