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Software Engineer II

About Mimecast

Relentless protection. Resilient world. Mimecast was born in 2003 with a focus on delivering relentless protection. Each day, we take on cyber disruption for our tens of thousands of customers around the globe; always putting them first, and never giving up on tackling their biggest security challenges together. We continuously invest to thoughtfully integrate brand protection, security awareness training, web security, compliance, and other essential capabilities. Mimecast is here to help protect large and small organizations from malicious activity, human error, and technology failure — and to lead the movement toward building a more resilient world.

The Team

You will join a product engineering squad within the Governance, Compliance & Insights (GCI) pillar — a team where your ideas shape the product and your code ships regularly, focused on building the features and services that help some of the worldʼs largest enterprise customers govern, archive, and gain insight from their collaboration and email data. We do a few things, and we do them at scale:

• Collaborate closely with product to continually add business value through feature development
• Show strong ownership of the full software development lifecycle alongside a team that trusts and supports each other
• Build and maintain services that process data at enterprise scale from email and collaboration platforms like Slack and Microsoft Teams
• Contribute to a culture of engineering excellence through code reviews, knowledge sharing, and continuously raising the bar for quality across the squad
• We hold a few beliefs about how that work should be done:
• Continuous deployment. Smaller chunks of work, shipped more frequently, with the safety rails to make that the default — not the exception.
• Builders own what they build. You own your features from design through production.
• Shipping is not the finish line — supporting what you ship is part of the job.
• Continuous learning is key. We learn from what we build and how we operate, using those lessons to streamline our processes and safeguards so we can move quickly and safely without repeating the same mistakes.

AI-First Engineering at Mimecast

Mimecast is an AI-First engineering organization. Our teams actively leverage AI-powered development tools across all facets of engineering, from code development to testing, documentation, and operations. We're looking for engineers who don't just use AI tools but champion their adoption and establish new ways of working.

Our AI leadership extends beyond how we build to what we build. Our Mihra AI agent delivers

7x faster threat response for customers, and we're recognized as "Agents of Change" in Human Risk Management. Engineers here work at the intersection of cutting-edge AI tooling and AIpowered security products that protect organizations worldwide.

The Role

As a Software Engineer II in the GCI pillar, you will build and maintain full-stack features — from modern, containerized backend services to user-facing React interfaces — that power compliance and insights for enterprise collaboration and email data. Your primary focus is feature development: working across C# and Java codebases, contributing to the React frontend, and owning your work from design through production.

You will work in a small, focused, cross-functional squad in close partnership with product, and alongside our SRE team who will guide you on deployment, observability, and infrastructure best practices.

What You'll Do:

• Build and maintain backend services in C# (.NET) and Java — including evolving mature C# codebases and contributing to greenfield Java services
• Contribute to React frontend work to complete vertical slices of functionality end to end, carrying features from API to screen when the work requires it
• Write well-tested, observable code that integrates with shared dashboards and our platform's logging and tracing standards
• Work with relational databases — writing migrations, queries, and data access patterns that are clean, correct, and maintainable
• Build on a modern, cloud-native technology stack — leveraging AWS services (including SQS, S3, and Bedrock), PostgreSQL, Elasticsearch, Kubernetes, and Grafana to deliver scalable, observable, and resilient features
• Handle production incidents as part of an on-call rotation, and feed learnings back into the codebase and runbooks
• Participate actively in sprint refinement and estimation, bringing both technical context and genuine curiosity to the conversation
• Collaborate with SDETs to build high-quality, performant, scalable, and testable software — treating quality as a first-class concern from design through delivery
• Partner with SRE — following their guidance on deployment practices, observability standards, and infrastructure conventions to ensure your services are production-ready
• Use AI tooling as a standard part of your daily engineering workflow: for code generation, debugging, documentation, review, and design

What You'll Bring:

We're looking for engineers with strong fundamentals and the aptitude to grow — we care as much about your ability to learn as your current skill set, and strong candidates will display strengths across many of these areas without necessarily checking every box.

• Proficiency in one or more statically-typed, object-oriented languages — C#/.NET or Java strongly preferred
• Solid experience with relational databases — schema design, migrations, and ORM patterns Demonstrable, accountable use of AI — coding and reasoning tool use as a core part of your daily workflow (e.g. Cursor, Claude, or GitHub Copilot), applied to real work such as code authoring, debugging, documentation, and alert investigation
• Familiarity with REST API design and microservices architecture
• Enough React/TypeScript to contribute meaningfully to frontend work when a feature calls for it
• Experience deploying or operating services in Kubernetes-based environments — at the consumer level, not the platform level
• Ability to read and contribute to observability tooling — you know how to instrument your code and read a dashboard when something breaks in production
• Comfort working within CI/CD pipelines and automated build and deployment workflows Experience with infrastructure as code (Terraform or similar) is a plus

Ways of Working

• You collaborate well on a cross-functional team of engineers, product, and UX designers
• You have a bias for action and prefer shipping small, frequent improvements over big-bang changes
•  You are comfortable with production ownership — on-call is part of the job, not someone else's problem
• You participate actively in team ceremonies: refinement, estimation, retrospectives
• You communicate clearly in writing — our teams are distributed, and async clarity matters
• You are comfortable saying "let's do this the right way" even when the shortcut is tempting
• You ask for help when you need it and give it freely when others do

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

The base salary range for this position is $124,000−$186,000 plus benefits. This range represents the minimum and maximum new hire compensation for this role. The position may also be eligible for incentive plans and additional benefits, in accordance with company policy and local regulations. Our salary ranges are determined by role, level, and location with individual compensation also dependent on factors such as qualifications, experience, and skills. Final offers will reflect these considerations and may vary accordingly.

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.

If you require any adjustments or accommodations due to a disability, or any other reason that may help you in your interview process, please let us know by emailing careers@mimecast.com.

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.