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 new 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 automated tests with CI/CD pipelines and ensuring successful automation as part of the standard build and release process.
- Driving continuous testing practices across the delivery lifecycle, ensuring fast, reliable feedback to engineering teams.
- Reporting, reproducing, and helping development resolve defects, with emphasis on troubleshooting, root cause analysis, and prevention of similar issues in the future.
- Using logs, code, telemetry, dashboards, traces, and AI-assisted analysis techniques to investigate defects and identify systemic quality issues.
- Contributing to design and code reviews for product and test code.
- Coaching engineers on testability, automation design, coding standards, maintainability, and quality-focused engineering practices.
- Promoting quality as a shared engineering responsibility, not just a downstream testing activity.

Required Skills / Experience :

- 10+ years of experience as a Software Development Engineer in Test (or similar role)

- Significant experience in building AI QE process recently.

- Engineering / Computer science degree or equivalent experience

- Extensive experience test planning and breaking down stories/requirements into testable units

- 6+ years of significant test automation work,



validating both back-end and front-end interfaces in at least one high-level object-oriented language, including:

- Extensive experience automating business logic in the services layer (RESTful API, SDK, or CLI, as appropriate)

- Proficiency in validating contract, functionality, correctness, and performance of REST API endpoints

- Familiarity with BDD tools like Cucumber, Jasmine, or equivalent

- Clear understanding of how to manage risk through negative testing, boundary/limits testing, load/soak testing, and other test aspects as appropriate, including system integration, performance/scale, security

- Solid object-oriented programming skills and experience automating in Java or similar

- Substantial experience in validation of UI-functionality and rendering, End-to-End testing, and UAT scenarios

- Extensive knowledge of Cypress with demonstratable experience in Protractor / Selenium

- Knowledge of Web Browsers, HTML, CSS, JavaScript, TypeScript, Angular, JSON, XML, integration with APIs, web servers

- Excellent knowledge of testing design patterns - for example, the Page Object Model

- 4+ years of experience as a technical leader of test projects and test teams

- Top notch coding skills, provision at conducting effective code reviews and coaching the team to raise their coding proficiency

- Extensive experience with CI/CD and Continuous Delivery model using Jenkins (or similar)

- Working knowledge of public cloud, especially AWS, and how to execute testing in an efficient, cost-effective manner in that environment

- Solid DB understanding (types, schemas, SQL queries, basic operations) and ability to incorporate database-side validation into automated tests

- Experience with multithreading, concurrency, Sa

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