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Senior Backend Engineer — Scalable APIs (Remote)

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66% 4 of 6 skills

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Location: Boulder, United States
Region: North America
Grade: Senior
Experience: 4+ yrs
Category: Backend
Country
Relocation: Not supported
Company: Product
Domains: FinTech

whatjobs Posted Aug 4, 2026

Summary

Lead backend engineering at Affirm, owning scalable APIs, system reliability, and code standards while guiding engineers through product and technical challenges.

Affirm is hiring for a Backend Engineering leadership role. You will own quarterly objectives, lead engineers through ambiguity, and collaborate with product, design, and analytics to deliver impactful features. You will drive operational excellence, keep systems reliable, and shape code quality standards across teams.

The role requires 4+ years building backend systems at scale with Python or Kotlin, and experience with AWS, MySQL, and Kubernetes. A Bachelor's degree or equivalent is expected.

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Affirm

5 days ago

Senior Backend Engineer - Scalable Payments & APIs (Remote)

North AmericaSenior H-1B sponsor history USCIS — This employer has had H-1B petitions approved by USCIS in the last five fiscal years, per the USCIS H-1B Employer Data Hub. The approval belongs to the employer and is not a commitment to sponsor this role.

Builds and scales backend APIs for Affirm’s buy-now-pay-later platform, focusing on payments integrations and merchant-facing services.

Affirm

4 days ago

Senior Backend Engineer: Scalable API Systems (Remote)

RemoteNorth AmericaSenior

A Senior Backend Engineer at a fintech company builds and maintains scalable API systems in Python/Kotlin, ensuring high availability and guiding teams to meet quarterly goals while collaborating with product, design, and analytics teams.

analyticsawskotlinkubernetesmysql +1 skills

83% · 5/6 skills

Affirm

2 days ago

Senior Backend Engineer - Scalable Systems (Remote)

RemoteNorth AmericaSenior

Builds and scales backend systems for Affirm’s credit and checkout platform, collaborating with engineers and product teams to design reliable, extensible architectures.

Affirm

last week

Senior Backend Engineer - Scalable Payments APIs (Remote)

RemoteNorth AmericaSenior H-1B sponsor history USCIS — This employer has had H-1B petitions approved by USCIS in the last five fiscal years, per the USCIS H-1B Employer Data Hub. The approval belongs to the employer and is not a commitment to sponsor this role.

Build and scale backend services for Affirm’s modern checkout and payment platform, designing APIs and distributed systems in a high-velocity engineering culture.

Affirm

last week

Senior Backend Engineer - Scalable, Reliable Systems (Remote)

Build and scale backend systems for Affirm’s credit platform using Python or Kotlin, AWS, MySQL, and Kubernetes to power payments, onboarding, and integrations.

analyticsawskotlinkubernetesmysql +1 skills

60% · 4/6 skills

Affirm

22 hours ago

Senior Backend Engineer - Scale & On-Call (Remote)

RemoteNorth AmericaSenior

Build and scale backend systems for a fintech company using Python/Kotlin, AWS, MySQL, and Kubernetes while owning quarterly goals and mentoring engineers.

analyticsawskotlinkubernetesmysql +1 skills

89% · 5/6 skills