Senior Software Engineer, Backend - Identity International

Affirm

. Own and deliver quarterly goals for the team .

Posted 9/21/2026full-timeRemote • United KingdomSenior💰 £120,000 - £168,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in designing and developing highly available distributed systems using Python and Kotlin, while effectively leading engineering teams through complex problem-solving and maintaining high coding standards. Proficient in collaborating across product management, design, and analytics to drive successful product development.

Highest-signal resume keywords

Backend System DesignPython ProgrammingKotlin ProgrammingAWS ExperienceKubernetes Proficiency

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Backend System DevelopmentDistributed SystemsHigh-Quality Coding PracticesCode Review StandardsTechnical Planning

Soft Skills

Strong Communication SkillsTeam CollaborationMentoring

Tools & Technologies

AWSMySQLKubernetes

Industry Keywords

Engineering StandardsSystem ReliabilityOperational MetricsTechnical ConstraintsProcess Improvement

Tech Stack

Tools & technologies

AWSDistributed SystemsKotlinKubernetesMySQLPython

About the role

Key responsibilities & impact

Own and deliver quarterly goals for the team
Lead engineers through ambiguous, open-ended problems and support them throughout delivery
Collaborate with product management, design and analytics throughout the product development lifecycle
Participate in ideation and articulate technical constraints
Partner on decisions considering risks and trade-offs
Identify and lead resolution of project, process, technology and business issues
Create and monitor metrics supporting operations and availability
Escalate issues and support keep-the-lights-on and on-call efforts
Set and improve code review and design standards
Advocate for engineering standards through writing and tech talks
Develop talent through feedback, guidance and leading by example
Write Kotlin and Python code, ship features, investigate production issues and maintain system reliability
Reduce toil, create playbooks, mentor engineers, support new hires and interns, and contribute to hiring

Requirements

What you’ll need

4+ years of experience designing, developing and launching backend systems at scale
Experience using Python or Kotlin
Track record developing highly available distributed systems
Experience with AWS, MySQL and Kubernetes
Experience defining technical plans for significant features or system components
Elegant, simple and extensible system design skills
High-quality coding practices
Proficiency making significant changes in a large code base
Tools and practices enabling safe codebase changes
Strong verbal and written communication skills
Ability to collaborate with a global engineering team

Benefits

Comp & perks

Monthly stipends for health, wellness and tech spending
100% subsidized medical coverage for employees and dependents
Dental and vision coverage for employees and dependents
Flexible time off
Generous holiday calendars
Employee stock purchase plan (ESPP) to buy Affirm stock at a discount
Inclusive interview process with accommodations for candidates with disabilities
In-person onboarding experience