Build the platforms behind synthetic identities, test data, mocking, and load testing that let Affirm engineers ship with confidence

Affirm is hiring a Senior Software Engineer for the Test Enablers team within Developer Productivity, which builds platforms for synthetic identities, test data seeding, mocking, deterministic testing, and load testing in service of a 1,000-PRs-per-day scaling goal. This interview focuses on distributed platform/testing-infrastructure design, operational ownership (SLOs, alerting, runbooks), and driving ambiguous, cross-team technical work from design through rollout.

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What this interview tests

Test/developer-productivity platform design: synthetic identities, test data seeding, mocking
Testing strategy: component, integration, contract, performance, and targeted E2E
Load testing infrastructure and making it safe/repeatable in production-like environments
Operational ownership: SLOs, dashboards, alerting, runbooks, incident readiness
Driving ambiguous, medium-to-large technical projects end to end
Cross-team influence via RFCs, ADRs, and technical specs

Common question themes

Describe a test data, mocking, or synthetic-identity platform you built and its architecture

How would you evolve a team away from E2E-heavy testing toward layered test strategies

Walk through a load-testing system you'd design to be safe and repeatable at scale

Tell me about an ambiguous technical project you drove from problem definition to operational ownership

How do you reduce false failures and improve CI signal quality

Describe how you've used RFCs or ADRs to align teams on a technical decision

How candidates describe it

Real Senior Software Engineer interview stories — retold from candidates' public write-ups, with sources.

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