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Affirm

Senior Software Engineer, Backend – Payments

Affirm

Senior Software Engineer developing and launching backend systems for Affirm’s payment processing network. Leading team collaboration to ensure reliability and performance in high growth business.

Posted 5/18/2026full-timeRemote • 🇬🇧 United KingdomSenior💰 £117,000 - £157,000 per yearWebsite

Tech Stack

Tools & technologies
AWSDistributed SystemsKotlinKubernetesMySQLPython

About the role

Key responsibilities & impact
  • Owning and delivering quarterly goals for your team
  • Leading engineers on your team through ambiguity to solve open-ended problems
  • Supporting peers and stakeholders in the product development lifecycle
  • Proactively identifying project, process, technology or business issues
  • Supporting the operations and availability of your team’s artifacts
  • Fostering a culture of quality and ownership on your team
  • Helping develop talent on your team by providing feedback and guidance

Requirements

What you’ll need
  • 4+ years of experience designing, developing and launching backend systems at scale using languages like Python or Kotlin.
  • A track record of developing highly available distributed systems using technologies like AWS, MySQL and Kubernetes.
  • Experience defining a technical plan for the delivery of a significant feature or system component with an elegant, simple and extensible design.
  • Proficient at making significant changes in a large code base, and have developed a suite of tools and practices that enable you and your team to do so safely.
  • Strong verbal and written communication skills that support effective collaboration with our global engineering team.

Benefits

Comp & perks
  • Health care coverage - Affirm covers all premiums for all levels of coverage for you and your dependents
  • Flexible Spending Wallets - generous stipends for spending on Technology, Food, various Lifestyle needs, and family forming expenses
  • Time off - competitive vacation and holiday schedules allowing you to take time off to rest and recharge
  • ESPP - An employee stock purchase plan enabling you to buy shares of Affirm at a discount

ATS Keywords

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Hard Skills & Tools
PythonKotlinAWSMySQLKubernetesbackend systemsdistributed systemstechnical planningcode base managementsoftware development
Soft Skills
leadershipproblem-solvingcollaborationcommunicationfeedbackguidancequality assuranceownershipteam developmentproactive identification