Senior Software Engineer, Fullstack (servicing International)

Affirm Affirm · Fintech · Poland, Spain · Remote · Financial Platforms - Engineering

Senior Software Engineer role focused on building and scaling the international servicing platform for Affirm, specifically handling purchase protection, disputes, and refunds. The role involves full-stack development, backend systems (Python, Kotlin, AWS, MySQL, Kubernetes), and frontend frameworks (React, Vue). Responsibilities include owning quarterly goals, leading engineers, collaborating with product and design, identifying and solving technical issues, supporting operations, fostering quality, and developing talent. Requires 4+ years of experience, backend systems expertise, and experience with web app frameworks. On-call rotation is required.

What you'd actually do

  1. You will be responsible for owning and delivering quarterly goals for your team, leading engineers on your team through ambiguity to solve open-ended problems, and ensuring that everyone is supported throughout delivery.
  2. You will support your peers and stakeholders in the product development lifecycle by collaborating with product management, design & analytics by participating in ideation, articulating technical constraints, and partnering on decisions that properly consider risks and trade-offs.
  3. You will proactively identify project, process, technology or business issues, advocate for them, and lead in solving them.
  4. You will support the operations and availability of your team’s artifacts by creating and monitoring metrics, escalating when needed, and supporting “keep the lights on” & on-call efforts.
  5. You will foster a culture of quality and ownership on your team by setting or improving code review and design standards for your team, and advocating for them beyond your team through your writing and tech talks.

Skills

Required

  • 4+ years of experience as a software engineer
  • Designing, developing, and launching backend systems at scale
  • Python, Kotlin, or similar backend languages
  • AWS
  • MySQL
  • Kubernetes
  • Building web apps with declarative UI frameworks (e.g., React or Vue)
  • Defining a technical plan for the delivery of a significant feature or system component
  • Writing high quality code
  • Making significant changes in a large code base
  • Developed a suite of tools and practices that enable you and your team to do so safely
  • Ownership of your growth
  • Proactively seeking feedback
  • Strong verbal and written communication skills
  • Effective collaboration with our global engineering team
  • On-Call Rotation

What the JD emphasized

  • On-Call Rotation
  • Python, Kotlin, or similar backend languages
  • exposure to
  • React or Vue
  • On-Call Rotation