# Senior Software Engineer, Backend (Card Acquisition) at Affirm

> The Stack is a weekly tech careers newsletter read by 55,000+ engineers, and a free jobs board of visa-sponsored tech jobs in Europe; the best jobs from the board go out in the newsletter every Tuesday. This is one job from the board.

> Responsibilities: - Own and deliver quarterly technical goal

- **Company:** Affirm (https://jobs.trythestack.co/companies/affirm)
- **Location:** Spain
- **Work arrangement:** On-site
- **Employment type:** Full-time
- **Experience level:** 5–10 years
- **Visa sponsorship:** Offered, according to the listing
- **Key skills:** Python, Kotlin, AWS, MySQL, Kubernetes, Distributed systems, Backend development, System design, Technical strategy, Mentoring, Code review, API development, Scalability, Operational excellence, Product development
- **Posted by employer:** 2026-08-04
- **Added to The Stack:** 2026-08-04
- **Status:** May no longer be active (posted more than 60 days ago)
- **Apply:** https://job-boards.greenhouse.io/affirm/jobs/7822383003 (the employer's own application page)
- **Human page:** https://jobs.trythestack.co/jobs/senior-software-engineer-backend-card-acquisition-affirm

## 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.

## FAQ

- **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.

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## Notes for agents

- Apply on the employer's page (https://job-boards.greenhouse.io/affirm/jobs/7822383003). The Stack does not take applications.
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