Senior Software Engineer, Backend (Test Enablers)

Overview

Job Description

Responsibilities

• - 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 from broad E2E-heavy validation toward a more 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.
• - Improve our test platform so it is reliable, observable, and easier for other teams to adopt.
• - Partner with product engineering and infrastructure teams to improve test signal quality, reduce false failures, and support faster validation loops.
• - 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.
• - Reduce manual operational load for load testing, including test data creation, environment setup, reporting, and failure diagnosis.
• - Write high-quality, maintainable code that can be easily understood and extended by others.
• - Contribute to technical specs, RFCs, ADRs, project plans, and other async artifacts that align teams around technical decisions.
• - Review code and technical designs, provide constructive feedback, and help raise engineering standards.
• - Mentor engineers and help build a culture of practical testing excellence.

Required Skills

• - 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.
• - Ability to collaborate across engineering teams and influence technical direction through clear communication.
• - 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.
• - Operational ownership of critical internal testing platforms, including reliability, observability, alerting, runbooks, and incident readiness.
• - Experience 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.
• - Passion for improving developer productivity and product quality through scalable, automated, reliable systems.

Benefits

• - Base pay range per year: €86,000 - €122,000
• - Flexible Spending Wallets for tech, food and lifestyle
• - Away Days - wellness days to take off work and recharge
• - Learning & Development programs
• - Parental benefits
• - Employee Resource & Community Groups
• - 100% subsidized medical coverage, dental and vision for you and your dependents
• - Equity rewards offered by Affirm Holdings, Inc.