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Senior Software Engineer

Affirm

$206,315 - $240,000
Oct 17, 2025
Remote, US
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Affirm is reinventing credit to make it more honest and friendly, giving consumers the flexibility to buy now and pay later without any hidden fees or compounding interest.

Requirements

  • Building software using modern programming languages such as Kotlin, Python, or  equivalent;
  • Designing full stack software solutions that are robust, maintainable, and scalable;
  • Leveraging software engineering best-practices such as Source Control, Agile  Methodology, or Code Reviews to develop and deploy projects within an agreed upon  timeline;
  • Debugging code issues utilizing logging and monitoring systems and stack trace analysis;
  • Writing technical specifications for software features, discussing tradeoffs and breaking  down complex concepts into actionable work items;
  • Developing backend features including APIs (application programming interfaces), data  schemas, data stores, and algorithms;
  • Ensuring code quality and system health via automated and manual test coverage,  debugging, and "on-call rotations";

Responsibilities

  • Design and develop software for the consumer facing mobile and web application;
  • Create tools and libraries that provide foundational functionality for, or in support of, the  core consumer facing web and mobile applications;
  • Maintain, improve, test, build, and release pipelines;
  • Provide guidance on core application architectural decisions and driving implementation;
  • Work with engineers across the organization on project definition, technical specification,  task break-down, delivery, monitoring, and maintenance;
  • Generate designs for new functionalities that are robust, maintainable and scalable;
  • Write code that can be understood and leveraged by others, and meet the demands of the  business’s rapid growth;

Other

  • Incorporate needs and opinions from stakeholders, advocating for ideas and initiatives;
  • Provide support on questions about the consumer facing application implementation and  the tooling built around the app;
  • Mentor less-experienced members of the team by helping them with code review and  setting up best coding practices.
  • May telecommute
  • Participating in recruiting efforts via conducting interviews and writing or presenting  technical content.