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About the Role

This senior leadership role is at the heart of Mimecast’s Email Security platform, leading a multi-squad engineering organization within the Email & Collaboration Security group. You will have full accountability for delivery outcomes, engineering quality, and organizational health, owning organizational strategy, engineering standards, and the conditions for sustained high performance at massive scale.

Responsibilities

Own the Organisation: Lead a multi-squad engineering organisation with full accountability for delivery outcomes, team health, and engineering culture.
Own organisational design — squad structure, reporting lines, and capacity — ensuring they remain fit for purpose as the business evolves.
Lead Leaders: Build, coach, and develop your Engineering Managers and leads.
Hold them accountable for delivery and people outcomes.
Build a strong leadership team with clear succession planning for key leadership and senior technical roles.
Drive Engineering Excellence: Set and maintain high standards across your squads: testing, observability, release governance, incident response, and secure development practices.
Hold the organisation accountable for operational excellence on a zero-downtime, globally distributed platform — including post-incident learning and continuous reliability improvement.
Own Technical Strategy: Translate product and business strategy into multi-quarter engineering plans.
Serve as the senior engineering authority for MTA in executive-level forums — including roadmap planning, major incident response, and strategic investment decisions.
Champion AI-Augmented Development: Drive adoption of AI development tools across your teams.
Establish governance for responsible AI usage and measure productivity impact.
Lead by example in building an AI-enabled engineering culture.
Stakeholder Management: Partner with Product Management, Security, and Operations leadership to align priorities, resolve cross-organisational dependencies, and ensure the roadmap reflects business-critical needs.
Represent engineering at VP and C-suite level, articulating capacity constraints, delivery risks, and investment trade-offs clearly.
Operational Accountability: Own the reliability and performance of the MTA platform.
Ensure robust monitoring, incident response, post-incident learning, and continuous reliability improvement.
People Leadership: Drive hiring strategy — including levelling decisions and interview standards.
Identify and grow high-potential talent with deliberate development paths.
Manage budget and headcount for your engineering segment with accurate forecasting.
Monitor and respond decisively to engagement, attrition, and performance signals.

Requirements

8+ years of software development experience with progressive engineering leadership responsibilities.
5+ years in engineering management, including experience leading other engineering managers (second-line leadership or above).
Proven track record of leading multi-team engineering organisations, with sustained improvements in execution quality, team health, and organisational capability.
Strong record of translating business strategy into engineering plans and representing engineering credibly to VP and C-suite stakeholders.
Background in high-availability, mission-critical distributed systems — sufficient to lead credibly and make informed investment decisions alongside senior technical stakeholders.
Prior experience as a software engineer, providing a credible technical foundation for leading deep engineering teams.
Experience navigating large-scale organisational change — team growth, restructuring, culture transformation, or delivery model shifts.
Excellent collaboration, influencing, coaching, mentoring, and communication skills.
A track record of building and sustaining high-performance engineering cultures following transformation or growth periods.
Continuous learning mindset, keeping abreast of relevant industry technologies, tools, and standards.
Demonstrated experience with AI-powered development tools such as GitHub Copilot, Cursor, Windsurf, Claude, or similar assistants, OR Strong enthusiasm and commitment to rapidly adopting AI tools and driving their adoption across your teams.
You will be expected to lead by example, integrating AI tools into your leadership practices and establishing strategies for AI adoption across your engineering teams.
Highly desirable: Experience in email security, messaging infrastructure, or cybersecurity product development.
Highly desirable: Experience with email protocols (SMTP, IMAP), authentication standards (SPF, DKIM, DMARC), or threat detection systems.
Highly desirable: Experience leading engineering transformation or platform decomposition initiatives.
Highly desirable: Background in SaaS product development with multi-tenant architecture.
Highly desirable: Engineering or Computer Science degree.
An offer of employment will be subject to your successful completion of applicable background checks, conducted in accordance with local law.

Skills

AI-Augmented Development
Email Security
Messaging Infrastructure
Cybersecurity Product Development
Email Protocols (SMTP, IMAP)
Authentication Standards (SPF, DKIM, DMARC)
Threat Detection Systems
SaaS Product Development
Multi-tenant Architecture
Collaboration
Influencing
Coaching
Mentoring
Communication

Location

London

Work Type

Hybrid

Experience Level

8+ years software development
5+ years engineering management
Second-line leadership or above

Education Level

Engineering or Computer Science degree (Highly desirable)

Salary/Compensations

£124,000−£186,000

Benefits

Formal and ‘on the job’ learning opportunities
Comprehensive benefits package
Incentive plans
Additional benefits in accordance with company policy and local regulations

About the Company

Mimecast is a leading cybersecurity company that helps organizations protect their people, data, and communications from today's most sophisticated threats.
With over 42,000 customers worldwide, we analyze more than 18 billion security events daily to stop attacks before they cause harm.
We are pioneers in Human Risk Management, recognizing that people are both an organization's greatest asset and its most significant security vulnerability.
Our platform addresses the human element of cybersecurity by combining advanced threat detection, awareness training, and Incydr risk management to reduce the likelihood and impact of human-caused security incidents.
Mimecast is an AI-First engineering organization.
Our teams actively leverage AI-powered development tools to accelerate innovation, improve code quality, and solve complex cybersecurity challenges at scale.
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.