Site Reliability Engineer II

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 as our Site Reliability Engineering function within the Human Risk Platform pillar, a team that sits at the center of how Mimecast builds, ships, and operates its cloud platform. We do three things, and we do them at scale:

• Cloud infrastructure: design, provision, and evolve the AWS foundations our product teams build on.
• CI/CD: build and maintain the pipelines that move code safely and frequently from commit to production.
• Observability: provide the logs, metrics, and traces that make our platform debuggable and trustworthy.

We have a few guiding principles that shape how we approach this work:

• 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. We work relentlessly to enable our team to safely access their own infrastructure, databases, and pipelines with auditability. Our job is to help teams help themselves, not to become a bottleneck.
• Process and standardization are paramount. We avoid one-offs and special cases at almost any upfront cost, because repeatability compounds.

The Role:

As a Site Reliability Engineer, you will be a hands-on engineer who stands up infrastructure, debugs it when it misbehaves, and turns both activities into repeatable, self-service patterns for the engineering teams we support. The ability to provision infrastructure and debug complex distributed systems is our top priority for this role. CI/CD expertise is a must to enable the team’s ability to continuously deliver to our customers.

You will work in partnership the broader highly focused engineering team to enable them. Expect to rotate between greenfield infrastructure buildouts, pipeline and tooling improvements, and the occasional deep incident investigation.

What You’ll Do:

• Stand up and evolve AWS infrastructure using Terraform, with a strong bias toward reusable modules and paved-road patterns over bespoke solutions. Practical IAM least privilege, secrets/certs handling and testability a must.
• Operate and improve Kubernetes-based workloads deployments, scaling, networking, and the platform glue that makes them boring to run. Capacity signals and basic performance triage.
• Build and maintain CI/CD pipelines (GitHub Actions preferred) that give engineering teams fast, safe, auditable paths to production.
• Progressive delivery. (canary/blue-green), rollback discipline.
• Partner with product squads to enable self-service access to their own infrastructure, databases, and pipelines with the guardrails, auditability, and standards that make that access safe.
• Debug production issues across the stack: networking, DNS, certificates, container orchestration, CI pipelines, and application-level behavior.
• Instrument services with appropriate logs, metrics, and traces, and help teams adopt the observability standards our platform teams define.
• Contribute to runbooks, automation, and standards that reduce toil and one-off work — if you fix it twice, codify it the third time.
• Participate in on-call; lead or co-lead incidents and write blameless postmortems with concrete follow up.
• Use AI tooling pragmatically and at a professional level: to accelerate code generation, infrastructure design, debugging, documentation, and review. We expect engineers to be AI-first in how they approach their craft.

What You’ll Bring:

• Hands-on Kubernetes experience: You can deploy, operate, and debug workloads on Kubernetes. You do not need to be an expert, but you should be comfortable in it.
• Terraform experience: You have written and maintained non-trivial Terraform. Again, expertise is not required; pragmatic competence is.
• Familiarity with setting up and maintaining CI and deployment automation. Experience with GitHub Actions is strongly preferred; experience with Jenkins, GitLab CI, or similar is transferable.
• A working understanding of observability fundamentals, logs, metrics, traces and how they are used during incident response.
• Networking knowledge: Security groups, TLS certificates, DNS, load balancing, and how traffic flows through a cloud environment.
• Experience with AWS or similar cloud platforms
• Experience working with relational databases is an asset, PostgreSQL is ideal but not required.
• Experience in software development as a full stack developer is a strong asset.

AI-First Engineering

Mimecast is an AI-first engineering organization. We expect every engineer to use modern AI tools (coding assistants, reasoning models, agentic tools) as a core part of their daily workflow for design, implementation, debugging, review, and documentation. For this role specifically, we are looking for:

• Demonstrable experience prompting and working with AI coding and reasoning tools to produce real, shipped work.
• Good judgement about when AI output is trustworthy and when it needs verification particularly for infrastructure code and production-impacting changes.
• An interest in applying AI tooling to SRE problems: incident triage, runbook generation, log analysis, Terraform authoring, and similar.

Ways of Working

• You collaborate well across teams and can work with product engineers, platform teams, and security peers without friction.
• You have a bias for action and problem-solving, and you prefer shipping small, frequent improvements over big-bang changes.
• You are comfortable saying “let’s standardize this” rather than building a one-off, even when the one-off would be faster today.
• You communicate clearly with the team in both spoken and written form.

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.

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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.

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.