Software Engineer I

Mimecast Services Ltd; Greater London; Hybrid; GBP 48,000 - 72,000; Full time

Job summary

Mimecast Services Ltd. is seeking a Software Engineer to join the Data Platform Team in the UK. You will build scalable backend services on AWS using Java, shape data pipelines, and support ML-ready data initiatives.

Expect a collaborative, AI‑driven development environment focused on reliability and performance. You will mentor junior engineers, document architectures, and contribute to cost-efficient, secure cloud operations while working within a hybrid model and cross-functional teams across

Qualifications

• Experience building backend services on AWS and data processing systems.
• Hands-on Java development with modern AWS tooling.
• Ability to mentor junior engineers and work in a collaborative team.

Responsibilities

• Implement scalable and reliable microservices on AWS infrastructure.
• Mentor and guide junior engineers, fostering a culture of collaboration and growth.
• Create and maintain technical documentation for architectures, processes and procedures.
• Provide support during critical incidents and implement preventive measures.
• Monitor AWS usage and recommend cost-saving measures without sacrificing performance.

Skills

Java

AWS

Microservices

Mentoring

Collaborative teamwork

Tools

Terraform

AWS CloudFormation

Jenkins

S3

ECS

ElastiCache

IAM

CloudWatch

Kafka

Job description

Software Engineer – Data Platform Team

The driving force behind Big Data at Mimecast

Overview Dive into the forefront of innovation with our Data Platform engineering team, where we process massive volumes of data to delight our customers with insights they love and fuel ML models with trusted data! Our pioneering Data Platform pushes on the boundaries of what's possible, leveraging making AI-native and agentic ways with AWS. "If you're interested in solving customer data challenges at immense scale, the Data Platform team is for you. Our AWS services process billions of events from millions of users each day. With efficient storage and querying capabilities, we're able to serve requests in milliseconds when querying over huge volumes of data!" – Hiring Manager

What You’ll Do:

• Implement scalable and reliable microservices on AWS infrastructure.
• Mentor and guide junior engineers, fostering a culture of collaboration, continuous learning, and professional growth.
• Create and maintain comprehensive technical documentation for architectures, processes, and procedures.
• Provide support during critical incidents and implement preventive measures.
• Monitor and analyze AWS usage, providing recommendations for cost savings without compromising system performance and reliability.

What You’ll Bring:

• Demonstratable ability to work effectively in a collaborative team environment, mentoring junior team members and contributing to a positive team culture.
• Experience with Java development to build services and libraries with Java 21 and above.
• Experience in developing and supporting backend systems for data processing within AWS.
• Hands‑on experience with foundational AWS services, such as; ALB, ECS, S3, ElastiCache, IAM, CloudWatch.
• Knowledge of implementing and maintaining Kafka-based event-driven services.
• Proficiency in either relational or NoSQL databases, with an understanding of database design, optimization, and management.
• Champion AI-powered development tools (Cursor, Claude) across the full engineering lifecycle with an AI-First engineering mindset.
• Experience with Infrastructure as Code (IaC) tools, such as Terraform or AWS CloudFormation.
• Knowledge of Jenkins and developing CI/CD pipelines.

AI-First Engineering at Mimecast

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. We're looking for engineering leaders who embrace these technologies or are eager to master them quickly. 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.

What We Bring

Join our Data Platform team to accelerate your career journey, working with cutting‑edge technologies and contributing to projects that have real customer impact. You will be immersed in a dynamic environment that recognizes and celebrates your achievements. Mimecast offers formal and on the job learning opportunities, maintains a comprehensive benefits package that helps our employees and their family members to sustain a healthy lifestyle, and importantly - working in cross functional teams to build your knowledge!

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!

Career Growth Opportunities

Power real-time cybersecurity at Mimecast—build scalable data platforms that drive threat detection, fuel AI innovation, and accelerate your path to system ownership and leadership Work at the intersection of data, AI, and cybersecurity to solve real-world threats

Manager's Working Style & Team’s Purpose

You're not just executing tasks—you’re shaping the data backbone that powers Mimecast’s cybersecurity products, while steadily growing into a system owner and technical decision-maker Own critical components end-to-end – from design to production, not just implementation Improve system scalability and cost efficiency, directly impacting business margins Enable faster AI/ML and analytics use cases by delivering clean, reliable data Identify gaps and drive platform improvements or new capabilities Gradually influence architecture decisions and engineering standards

Salary

The base salary range for this position is £48,000−£72,000 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 Affiliation 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. 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. We save companies the embarrassment of awkward data slip ups by disrupting cybercriminal activity. We think fast, go big and always demand more. We work hard, deliver – and repeat. We grow with meaningful determination. And put success well within our reach. We empower each other, live by our values, and always deliver on our purpose. We push each other to be better and expect to be pushed back. This is a community of respect. Where everyone is counted.