Sr. SDET (Senior Software Development Engineer in Test, Middleware)

The Subway HR Team•Shelton, CT

1d•Onsite

About The Position

Subway’s middleware platform is the integration backbone of our digital commerce stack — connecting front-end applications (iOS, Android, Web, Kiosk) with internal systems and third-party partners like DoorDash and Uber Eats. As the Senior SDET, Middleware, you will lead the design, development, and implementation of automated testing solutions that validate the functionality, performance, accessibility, and reliability of the services built by our Senior Software Engineers. This is an engineering-first role. You will write production-quality test code, architect scalable test frameworks, and embed automated quality gates directly into our CI/CD pipelines. AI-assisted development is a core part of how our team works — you’ll use tools like GitHub Copilot and Claude daily.

Requirements

5 or more years of experience as an SDET or software engineer with a strong focus on test automation and quality engineering.
Demonstrated ability to architect and build automated test frameworks from the ground up for distributed, API-driven systems.
Proficiency in one or more of: JavaScript/TypeScript (Node.js), Java, or Python for writing production-quality test code.
Hands-on experience designing and executing performance, load, and reliability test strategies against backend services.
Working knowledge of AWS serverless services (Lambda, API Gateway, DynamoDB, SQS/SNS).
Experience embedding automated tests into CI/CD pipelines (Azure DevOps, GitHub Actions, or equivalent).
Proficiency with AI-assisted development tools (GitHub Copilot, Claude, or equivalent).
Strong software engineering fundamentals — able to write clean, maintainable, reviewable test code.
Bachelor’s degree or higher in Computer Science, Software Engineering, or a related field (or equivalent practical experience).

Responsibilities

Lead the design and development of automated test frameworks and test suites covering functional, integration, contract, performance, accessibility, and end-to-end scenarios for middleware APIs and services.
Leverage AI-assisted development tools (GitHub Copilot, Claude, and similar) as a core part of daily engineering work. Champion AI tooling adoption across the team.
Own the design and execution of performance and reliability test strategies — including load, stress, spike, and soak testing — to establish service baselines and validate SLA compliance before production release.
Partner with Senior Software Engineers and the Senior Quality Engineer throughout the development lifecycle: collaborate on test strategy, review service designs for testability, and integrate automated quality gates into CI/CD pipelines.
Validate third-party integrations (DoorDash, Uber Eats, and similar partners) through contract testing, sandbox environment validation, and failure mode analysis.
Define and track test coverage and quality metrics across the middleware portfolio; contribute to incident post-mortems with defect analysis and regression findings.