Senior Software Engineer, Backend (Test Enablers)

New

Remote SpainFull-TimeSenior

Salary€86,000 - €122,000 per year

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Job Details

5+ years of software engineering experience.
Strong backend engineering experience with Python, Kotlin, Java, or similar languages.
Experience designing, building, and operating distributed systems, platform infrastructure, internal developer tools, or testing infrastructure.
Strong ownership and ability to independently drive ambiguous technical work to completion.
Experience improving system reliability, observability, operational maturity, and maintainability.
Excellent written and verbal communication skills, including async artifacts such as technical specs, RFCs, ADRs, and project plans.
Strong engineering fundamentals across system design, testing, debugging, reliability, and production operations.
Experience with test automation frameworks, test data systems, mocks, contract testing, integration testing, load testing and CI/CD platforms.

Design, build, and maintain scalable systems for synthetic identities, test data seeding, mocking, load testing, and deterministic validation workflows.
Help evolve Affirm’s testing strategy toward a scalable model with stronger component, integration, contract, performance, and targeted E2E testing.
Build platform capabilities that make production-like load testing safer, more repeatable, and easier to operate.
Lead medium-to-large technical projects from ambiguous problem definition through design, implementation, rollout, and operational ownership.
Improve reliability and operational maturity through dashboards, SLOs, alerts, runbooks, and clear ownership models.
Review code and technical designs, provide constructive feedback, and help raise engineering standards.
Mentor engineers and help build a culture of practical testing excellence.

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