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About 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. 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.

Responsibilities

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

Requirements

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
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
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
An offer of employment will be subject to your successful completion of applicable background checks, conducted in accordance with local law.

Skills

C#
Java
React
AWS services (SQS, S3, Bedrock)
PostgreSQL
Elasticsearch
Kubernetes
Grafana
AI tooling

Location

London

Work Type

Hybrid

Experience Level

Associate
Early-career

Salary/Compensations

£40,000−£57,000

Benefits

Incentive plans
Additional benefits

About the Company

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.
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.
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 AI-powered security products that protect organizations worldwide.

Equal Opportunity

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.