Senior Backend Engineer - Trust & Safety (Remote)

Affirm, Inc.; Philadelphia (Philadelphia County); Remote; USD 173,000 - 255,000; Full time

Benefits offered by this job

Medical coverage for dependents

ESPP stock purchase

Tech & wellness stipends

Remote-first with flexibility

Generous holiday calendar

Job summary

AffiRm is seeking a Senior Backend Engineer to own and deliver quarterly team goals in a remote-first US environment. You will build scalable backend systems using Python or Kotlin and collaborate with product, design and analytics while managing risk and trade-offs.

You will lead by example, establish coding standards, and mentor teammates. The role emphasizes reliability, on-call readiness, and a strong ownership mindset in a fast-paced security-focused team.

Qualifications

• 4+ years of experience designing, developing and launching backend systems.
• Experience building highly available distributed systems.
• Proficient with Python or Kotlin and modern backend tech.
• Ability to define technical plans for major features with elegant design.
• Strong ownership, feedback seeking, and collaboration.

Responsibilities

• Own and deliver quarterly goals for your team and lead engineers through ambiguity.
• Collaborate with product, design and analytics to balance risks and trade-offs.
• Identify and address project, process, technology, or business issues.
• Maintain metrics and support on-call efforts for team reliability.
• Set and promote code review and design standards across the org.
• Mentor teammates and grow talent through feedback.

Skills

Backend design

Distributed systems

Python/Kotlin

System design

Ownership

Education

Bachelor's degree or equivalent

Tools

AWS

MySQL

Kubernetes

Job description

AffiRm is seeking a Senior Backend Engineer to own and deliver quarterly team goals in a remote-first US environment. You will build scalable backend systems using Python or Kotlin and collaborate with product, design and analytics while managing risk and trade-offs.

You will lead by example, establish coding standards, and mentor teammates. The role emphasizes reliability, on-call readiness, and a strong ownership mindset in a fast-paced security-focused team.