# Senior Software Engineer, Backend (Test Enablers) 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: - Design, build, and operate scalable plat

- **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, Java, Distributed Systems, Platform Infrastructure, System Design, Test Automation, CI/CD, Load Testing, Observability, Backend Engineering, API Mocking, Contract Testing, Integration Testing, Technical Specification Writing, Mentoring
- **Posted by employer:** 2026-07-01
- **Added to The Stack:** 2026-07-01
- **Status:** May no longer be active (posted more than 60 days ago)
- **Apply:** https://job-boards.greenhouse.io/affirm/jobs/7731648003 (the employer's own application page)
- **Human page:** https://jobs.trythestack.co/jobs/senior-software-engineer-backend-test-enablers-affirm

## About the role

Responsibilities:
- Design, build, and operate scalable platforms for synthetic identities, test data seeding, mocking, deterministic workflows, and load testing.
- Shift testing strategy from E2E-heavy validation to a mix of component, integration, contract, performance, and targeted E2E tests.
- Make production-like load testing safer and repeatable with automation, environment orchestration, and repeatable data setup.
- Improve observability and reliability: implement dashboards, SLOs, alerts, runbooks, and clear ownership for test infrastructure.
- Lead medium-to-large technical projects from problem definition through rollout and operational ownership; review designs and mentor engineers.

Requirements:
- 5+ years of software engineering experience with strong backend skills in Python, Kotlin, or Java.
- Proven experience building distributed systems, developer tooling, or platform infrastructure for testing and CI/CD.
- Strong knowledge of test automation, load testing, observability, and failure diagnosis practices.
- Experience writing technical specs (RFCs, ADRs) and driving cross-team alignment.
- Excellent communication and mentorship skills; comfortable working with product teams to improve test signal quality.

## Responsibilities

Design and maintain scalable platforms for synthetic identities, test data seeding, and load testing to accelerate software development. Lead technical projects to evolve the testing strategy from E2E-heavy validation toward a more scalable, deterministic model.

## Requirements

Requires 5+ years of software engineering experience with strong backend skills in Python, Kotlin, or Java. Must have experience building distributed systems or developer tools and the ability to drive ambiguous technical projects to completion.

## FAQ

- **Is this Senior Software Engineer, Backend (Test Enablers) role still open?** It was posted on 2026-07-01. 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, Java, Distributed Systems, Platform Infrastructure, System Design, Test Automation, CI/CD, Load Testing, Observability, Backend Engineering, API Mocking, Contract Testing, Integration Testing, Technical Specification Writing, Mentoring.

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## Notes for agents

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