Associate Software Engineer

About Mimecast

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.

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 world’s largest enterprise customers govern, archive, and gain insight from their collaboration and email data.

• 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.

The Role

As an Associate Software Engineer 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.

What You’ll Do:

• Build and maintain backend services in Java and C# (.NET) — 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
• 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
• 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:

• A foundation in programming in at least one language such as Java, C# or Python
• A willingness to use AI coding tools (e.g. Cursor, Claude, or GitHub Copilot) responsibly as part of your daily workflow
• Curiosity about how modern software is built and run — APIs, cloud, containers, and production systems — and eagerness to learn our stack
• A bias for learning by doing, asking questions, and improving with each iteration

Ways of Working

• 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

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.

The base salary range for this position is £40,000−£57,000 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.

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.