Senior Software Engineer, Backend – Test Enablers

This is a fully remote position, open to applicants in Poland.

📋 Description

• Design, develop, and maintain scalable systems for synthetic identities, test data seeding, mocking, load testing, and deterministic validation workflows.

• Assist in evolving Affirm’s testing strategy from a predominantly E2E validation approach to a more scalable model that emphasizes stronger component, integration, contract, performance, and targeted E2E testing.

• Create platform capabilities that enhance the safety, repeatability, and ease of operation for production-like load testing.

• Enhance our testing platform to ensure it is reliable, observable, and more accessible for other teams to utilize.

• Collaborate with product engineering and infrastructure teams to enhance test signal quality, minimize false failures, and facilitate quicker validation cycles.

• Lead medium to large-scale technical projects from vague problem definitions through to design, implementation, rollout, and operational management.

• Boost reliability and operational maturity through dashboards, SLOs, alerts, runbooks, and well-defined ownership models.

• Decrease manual operational workloads associated with load testing, including test data creation, environment setup, reporting, and failure diagnostics.

• Produce high-quality, maintainable code that is easily comprehensible and extendable by other team members.

• Contribute to technical specifications, RFCs, ADRs, project plans, and other asynchronous artifacts that unify teams around technical decisions.

• Review code and technical designs, offer constructive feedback, and help elevate engineering standards.

• Mentor engineers and foster a culture of practical testing excellence.

⛳️ Requirements

• 5+ years of experience in software engineering.

• Strong backend engineering experience with Python, Kotlin, Java, or similar programming languages.

• Experience in designing, building, and operating distributed systems, platform infrastructure, internal developer tools, or testing infrastructure.

• Proven ownership and capability to independently drive ambiguous technical projects to successful completion.

• Experience in enhancing system reliability, observability, operational maturity, and maintainability.

• Ability to collaborate across engineering teams and influence technical direction through effective communication.

• Excellent written and verbal communication skills, including proficiency in asynchronous artifacts such as technical specifications, RFCs, ADRs, and project plans.

• Strong foundation in engineering principles related to system design, testing, debugging, reliability, and production operations.

• Operational ownership of essential internal testing platforms, focusing on reliability, observability, alerting, runbooks, and incident readiness.

• Familiarity with test automation frameworks, test data systems, mocks, contract testing, integration testing, load testing, and CI/CD platforms.

• Ability to balance pragmatic delivery with long-term technical quality.

• Enthusiasm for enhancing developer productivity and product quality through scalable, automated, and reliable systems.

🏝️ Benefits

• 100% subsidized medical coverage, dental, and vision for you and your dependents.

• Flexible Spending Wallets for technology, food, and lifestyle expenses.

• Away Days - wellness days to take a break from work and recharge.

• Learning & Development programs.

• Parental benefits.

• Employee Resource & Community Groups.

• Health care coverage - Affirm covers all premiums for all levels of coverage for you and your dependents.

• Flexible Spending Wallets - generous stipends for spending on technology, food, various lifestyle needs, and family formation expenses.

• Time off - competitive vacation and holiday schedules allowing you to take time off to rest and recharge.

• ESPP - An employee stock purchase plan enabling you to acquire shares of Affirm at a discount.