Senior Software Engineer, Backend (Card Acquisition) at Affirm

✨ The Stack take on this Affirm job

• 🏢 Affirm has 38 jobs here, 25 with visa sponsorship see all
• 🛂 Visa: Highly Qualified Professional permit. Education: Higher education degree guide
• 💡 No salary shown. Ask Affirm if it is above the minimum.

Updated 2026-11-05, from our data and official sources.

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About the role

Responsibilities:
- Own and deliver quarterly technical goals for the Card Acquisition team.
- Define long-term technical strategy and lead engineers through ambiguous, open-ended problems.
- Partner with product, design and analytics to translate requirements, articulate constraints, and make trade-offs.
- Ensure operational excellence: implement monitoring, alerts, runbooks, testing, triage rotations and on-call readiness.
- Raise engineering quality: set code-review and design standards, present technical guidance, and mentor senior engineers.
- Proactively identify and remove project, process or tech blockers that impact delivery and reliability.

Requirements:
- 4+ years building backend systems at scale using Python or Kotlin.
- Hands-on experience with highly available distributed systems (AWS, MySQL, Kubernetes).
- Strong system design skills: produce simple, extensible architectures and make safe large-codebase changes.
- Familiarity with monitoring, deployment safety, testing strategies and on-call practices.
- Demonstrated collaboration skills across product/design/analytics and experience mentoring peers.
- Comfortable navigating ambiguity and owning delivery, operations and technical trade-offs.

Responsibilities

You will lead the technical strategy and delivery for the Card Acquisition team while mentoring senior engineers to solve complex, open-ended problems. You will also collaborate with product, design, and analytics teams to build performant user experiences and ensure operational excellence through robust monitoring and testing.

Requirements

Candidates must have 4+ years of experience in designing and launching backend systems at scale using Python or Kotlin. You must also possess a strong background in distributed systems using AWS, MySQL, and Kubernetes, along with a bachelor's degree or equivalent practical experience.

Key skills

• Python — in 1200 other listings on The Stack
• Kotlin — in 251 other listings on The Stack
• AWS — in 802 other listings on The Stack
• MySQL — in 93 other listings on The Stack
• Kubernetes — in 585 other listings on The Stack
• Distributed systems — in 342 other listings on The Stack
• Backend development — in 171 other listings on The Stack
• System design — in 199 other listings on The Stack
• Technical strategy
• Mentoring
• Code review
• API development
• Scalability
• Operational excellence
• Product development

On The Stack (as of 2026-11-05)

• Affirm has 37 other listings on The Stack, 24 of them marked as offering visa sponsorship.
• 76 visa-sponsored jobs in Spain on The Stack, posted in the last 60 days.
• 195 visa-sponsored software engineer jobs in Europe on The Stack, posted in the last 60 days.

Frequently asked questions about Affirm

Is this Senior Software Engineer, Backend (Card Acquisition) role still open?

It was posted on 2026-08-04. Listings more than 30 days old may no longer be active, so check Affirm's site before applying.

Does Affirm offer visa sponsorship?

This listing is marked as offering visa sponsorship. Eligibility rules are set by the employer, so check the details on Affirm's site.

Where is this role located?

The listing gives the location as Spain. It is marked on-site.

What skills does this role ask for?

The listing names: Python, Kotlin, AWS, MySQL, Kubernetes, Distributed systems, Backend development, System design, Technical strategy, Mentoring, Code review, API development, Scalability, Operational excellence, Product development.