Senior Software Development Engineer in Test – Identity Platform

About the Job/Overview

The engines behind our threat-blocking tech. 

Overview

Want to work on technical challenges that span complex micro-service architectures, millions of users and tens of thousands of servers? Then come join our dynamic Engineering Team and deliver products to millions of users!

We are seeking a Senior SDET to join our Identity Platform team. In this role, you will focus on designing and implementing robust automated testing solutions to validate authentication, authorization, and identity federation capabilities. You’ll collaborate with engineers across multiple teams to build a secure, scalable, and highly available identity infrastructure that serves millions of users across our platform.

This is a high-impact, technical role requiring deep knowledge of API testing, identity protocols (OAuth2, OpenID Connect, SAML), and cloud-native development practices.
 

AI-First Engineering at Mimecast

The successful candidate will be expected to bring an AI-first but engineering-led mindset. This means being able to identify where AI can genuinely improve engineering outcomes, while maintaining strong technical judgement, quality standards, and security awareness. This includes:

• Using AI to accelerate repetitive or analysis-heavy engineering tasks.
• Applying AI to improve test design, scenario coverage, code quality, defect diagnosis, and documentation.
• Helping teams move from ad hoc AI usage to repeatable, trusted engineering workflows.
• Coaching engineers on where AI is useful, where it is risky, and how to validate AI-generated output.
• Measuring the impact of AI adoption through productivity, quality, reliability, and speed-of-feedback improvements.
• Ensuring AI usage supports secure, responsible, and compliant engineering practices.
   

What You’ll Do

• Contributing to the planning, estimation, and refinement of stories, epics, and design changes as part of an Agile Scrum team
•  Design and build scalable automated test frameworks to validate REST APIs, SDKs, and microservices within the Identity Platform
• Develop test strategies and coverage plans for core identity workflows including login, MFA, SSO, and delegated access
• Build test harnesses for OAuth2/OpenID Connect authentication flows and third-party integrations (e.g., Azure AD, Google, Okta)
• Drive test automation within CI/CD pipelines to ensure fast and reliable deployments
• Perform system integration testing with identity providers and downstream services
• Analyse test failures, debug root causes, and partner with engineers to resolve issues quickly
• Collaborate with architects and developers to ensure secure and testable design of services
• Contribute to test plans, code reviews, risk assessments, and release sign-offs
• Mentor junior SDETs and advocate for quality-first development practice

What You’ll Bring

• Bachelor’s or Master’s degree in Computer Science, Engineering, or related field
• 8+ years of hands-on experience in software testing with at least 2 years focused on identity or platform engineering
• Proficient in Java for automation development
• Expertise in REST APIs, SDKs, and backend microservices
• Deep experience in identity protocols: OAuth2, OpenID Connect, SAML, JWT
• Expertise with public cloud platforms, especially AWS
• Strong experience integrating and testing with external identity providers (e.g., Azure AD, Google Workspace)
• Experience with tools like Postman, RestAssured, Cypress,and Cucumber
• Solid understanding of CI/CD pipelines (e.g., Jenkins, Gitlab) and containerized environments (Docker/Kubernetes)
• Database familiarity (types, schemas, SQL queries, basic operations) and ability to incorporate database-side validation into automated tests
• Strong debugging, troubleshooting, and root cause analysis skills
• Experience in deep diving into logs, code and other elements to understand and solve problems
• Passion for security, performance, and continuous improvement

What We Bring

• Impact: Your work will directly influence the security and success of global enterprises.
• Growth: Opportunities for technical leadership, mentorship, and continuous learning.
• Modern Stack: Work with the latest cloud-native and DevOps technologies.
• Supportive Culture: Join a team that values innovation, autonomy, and personal growth.

Our Hybrid Model: We provide you with the flexibility to live balanced, healthy lives through our hybrid working model that champions both collaborative teamwork and individual flexibility. Employees are expected to come to the office at least two days per week, because working together in person:

• Fosters a culture of collaboration, communication, performance and learning
• Drives innovation and creativity within and between teams
• Introduces employees to priorities outside of their immediate realm
• Ensures important interpersonal relationships and connections with one another and our community!

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Belonging at Mimecast

Cybersecurity is a community effort. That’s why we’re committed to building an inclusive, diverse community that celebrates and welcomes everyone – unless they’re a cybercriminal, of course.

We’re proud to be an Equal Opportunity and Affirmative Action Employer, and we’d encourage you to join us whatever your background. We particularly welcome applicants from traditionally underrepresented groups.

We consider everyone equally: your race, age, religion, sexual orientation, gender identity, ability, marital status, nationality, or any other protected characteristic won’t affect your application.

Due to certain obligations to our customers, an offer of employment will be subject to your successful completion of applicable background checks, conducted in accordance with local law.

It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment.