Senior Software Engineer, Backend (International)

Affirm

Remote UKRemoteFull-time£120k–£168k2026-10-30 → 2026-11-10

No visa sponsorship

Core

Build and operate payment systems enabling bank and card payments across Affirm's international markets in Europe.

Role type

Senior Backend Software Engineer (Payments)

Builds

Payment infrastructure and shared capabilities for international market expansion

Domain

Fintech / Payments / Distributed Systems

Required skills

Python, Kotlin, AWS, MySQL, Kubernetes, distributed systems design, technical planning, codebase refactoring, on-call support, team leadership

Preferred skills

None stated

Technologies

Python, Kotlin, AWS, MySQL, Kubernetes

Responsibilities

Lead engineers through ambiguity to solve open-ended problems; collaborate with product and design on technical constraints; identify and solve project/process/technology issues; monitor system metrics and support on-call efforts; set code review and design standards; develop team talent

Seniority

Senior, hands-on IC with leadership responsibilities

About Affirm

Financial Services3128San Francisco, California, USFounded 2012

At Affirm, we’re using today’s technology to bring significant disruptive innovation to the financial industry. We focus on improving the lives of consumers by delivering simple, honest and transparent financial products. We have roles across a variety of teams, including engineering, product, finance, operations, revenue, marketing, people and more. A note to applicants: Fake job and recruiting scams are on the rise. Affirm will never ask you to pay any upfront fees or send you any checks to purchase equipment during any part of the recruiting process. Affirm only uses legitimate company emai