Principal Software Development Engineer in Test - Full Stack

This role requires someone who can combine deep hands-on engineering capability with technical leadership, using modern automation, CI/CD, observability, and AI-enabled engineering practices to improve quality, speed, reliability, and release confidence.

A positive attitude, strong ownership mindset, and willingness to learn, coach, and share knowledge are essential.

At Mimecast, Principal Software Development Engineers in Test are responsible for:
- Providing technical leadership and coaching/mentoring other engineers on the team to deliver testing for large projects and/or ongoing product efforts.
- Acting as a senior technical voice for Quality Engineering across product, platform, architecture, development, DevOps, and security teams.
- Taking initiative to drive continuous improvement through monitoring, tooling, automation, process improvements, and engineering best practices.
- Bringing an AI-first mindset to quality engineering by identifying practical ways to use AI to improve test design, test automation,



code review, defect analysis, test coverage, documentation, and engineering productivity.
- Standardising the agents to build QE process as a QE Engine.
- Helping teams adopt AI-enabled engineering practices safely and effectively, ensuring AI is used to accelerate delivery while maintaining quality, security, and engineering discipline.
- Building out test plans to cover recent areas of functionality, ensuring all necessary functional and non-functional testing is performed.
- Contributing to the planning, estimation, and refinement of stories, epics, and design changes as part of an Agile Scrum team.
- Refining acceptance criteria into testable units and converting those into automated tests that execute efficiently and reliably.
- Using AI-assisted tools, to accelerate acceptance criteria analysis, test scenario generation, edge-case discovery, and automation development.
- Integrating automa

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