Mimecast
Senior Solution Architect - Email & Collaboration Security
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Senior Solutions Architect – Email & Collaboration Security
Location: London, UK
Why This Role Exists
The Email & Collaboration Security (ECS) product line addresses some of the most critical challenges in enterprise security:
- AI-augmented threats
- Sprawling collaboration surfaces
- Multi-cloud complexity
- Upward momentum with threat detection and response
This architecture is not a greenfield project—it carries 20 years of product history, legacy integrations, and operational constraints. The right candidate must:
- Understand product heritage and future directions
- Bridge gaps between product management, engineering, and architecture leadership
- Drive cohesive technical direction that empowers agile, high-quality development
Mimecast is an AI-first organisation. This is not grade-A fluff—it’s an expectation. The right candidate:
- Uses AI tools daily for design, documentation, prototyping, research, and more
- Understands where AI accelerates decisions (and where it introduces risk)
- Can architect with AI components—raging on LLMs, agent boundaries, prompt/data contract stability
- Leaves everyday familiarity with AI tooling behind
The ECS Domain
Key area expertise includes:
- Email threat detection & prevention
- Collaboration security
- DMARC analysis
- Data platform & observability
- Incident analysis & response
- End-user application integration
- Internal operations enablement
What You Will Do
Solve at the Problem Level, Not Downstream
- Lead problem discovery with PMs, UX, and engineering
- Craft clear business/UX-minded outcomes before design confinement
- Push back on solutions that ignore real customer constraints
Own Durable Integration Contracts
- Treat APIs, events, data schemas as first-class product artefacts
- Ensure integration-locks between teams and across time
- Advocate fairness on schema evolution, interface stability
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Build the Architecture Context
- Align to Automated Data Records (ADRs), service patterns, non-functional requirements
- Seek solutions for AI integration with rigor (limits to LLMs, trusted agents, prompt fluency)
Enforce Governance Without Hampering Agility
- Trim recursion—remove unnecessary complexity
- Push back surprisingly on platform rules clashing with ECS
- Partner with Chief Architect to achieve aligned decisions
Cost vs. Outcome
- Sizing costs must align with actual security outcomes
- Opt for metrics (e.g. per mailbox or per incident)
- Order cloud spend awareness over bare solution scale
Communicate at Every Level
- Pen stakes-clarifying decision records (engineering scope)
- Articulate strategic solutions (product & commercial)
- Use whiteboards to build decisions, not just visualization
What You Will Bring
Architectural & Development Experience
- 10+ years building SaaS systems, 3 years+ in roles like Solutions Architect or Principal Engineer
- Breadth over depth—broader architectural lenses than hyper-specialism
- Cloud-native fluency: AWS, Kafka, micro-services, high-throughput event systems
- Cross-functional engagement: collaborating with PM, UX designers
Thoughtful Approach to Complex Systems
- Legacy systems as currency, not clutter—realistic shaping of decades-to-old algorithms
- Cognitive rigor—files must be easier to understand than you found them
Self-Direction & Strategic Hunt
- Self-apply transformation to underlying problems before mandate
- Operational on principles without micromanagement
- Articulate tangled dots to gain clarity
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Learning-Minded Problem-Solving
- Run to an answer, don’t hoard one
- AI as a stimulus—engage for prototyping, documentation, analysis
- Future-driven: monitor advances and infuse foresight into product/architecture
Bonus Prestige (Requested, Not Required)
- Email security/DLP/collaboration influence background
- LLM/agent design or data mesh experience
What We Offer
Core Benefits
- Impact of mass Scale: Engineering a corner of millions of mailboxes
- Authorship of Platform Direction: Inform Chief Architect’s vision
- Culture fit: Architecture Leadership sits amid trusted peers
- Expected Salary: £124K–£186K base + benefits
- Incentives: Eligible for bonus plans & professional development
Company Perception
Mimecast empowers people who:
- Protect companies from pitfalls before they happen
- Promote growth-streaming, discovery-led impact
- Create an authentic marketplace for ideas
- Respect, seek, act on diverse views
Essential Qualifications
- Bachelor’s in CS/Software or equivalent exp
- C-level architectural notion: NS/SCAs vs. service delivery
- Routine AI implementation: Not’something on my weekend’
Diversity & Belonging
Mimecast resists one product-fit myth here. While we prioritize impact based on output:
- Mind ‘impact your brand’ at all stages, regardless of background.
Affirmative Action six-flag culture: Race, gender, religion, sexual expression, ability, etc.
Future Hiring Note
An offer requires policy-compliant security screening.
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