Sr Software Development Engineer in Test

Senior Software Development Engineer in Test

*CyberGraph Team Bengaluru, India Full time*

Job Summary

Help keep organisations safe from targeted email attacks - Senior SDET on CyberGraph, Mimecast s AI-enabled social graphing product.

Overview

CyberGraph is an AI-enabled social graphing product that detects and differentiates between normal and anomalous behaviour. It helps customers detect targeted email attacks, prevent data leaks, and limit attacker reconnaissance.

Mimecast is looking for a talented Senior SDET to join the CyberGraph and AIP Engineering team. You will play a pivotal role in designing, developing, and releasing quality product features that delight our customers.

We are seeking a Senior SDET who will design and implement robust automated testing for Java microservices, AWS-hosted platforms, and performance-critical email security and threat-detection workflows. You will work with engineers across squads to keep CyberGraph secure, scalable, and highly available.

This is a high-impact technical role. The core focus is Java automation, AWS services, and Performance Engineering, with strong API, integration, and CI/CD skills.

At Mimecast, our people make the difference. This role sits at the heart of product quality - the work you do will directly protect enterprises, and you will do it with a team that values innovation, autonomy, and personal growth.

What You ll Do

You will own quality for CyberGraph features and integrations - from story refinement through release sign-off. Day to day, you will design Java test frameworks, run performance tests on AWS, and partner with engineers so services are testable, observable, and performance-ready. No regular travel is expected.

• Plan, estimate, and refine stories, epics, and design changes in Scrum.
• Build scalable Java test frameworks for REST APIs, SDKs, and microservices.
• Own test strategy for features and integrations.
• Design and run performance, load, soak, and scale tests on AWS (latency, throughput, errors, saturation).
• Build harnesses for AWS flows (ECS, SQS, SNS, S3, DynamoDB, Lambda) and test load plus failure.
• Gate CI/CD on functional and performance signals.
• Run system integration testing across CyberGraph and dependent platforms.
• Debug failures from logs and metrics, find root cause, and close issues with engineers.
• Work with architects and developers so services are testable, observable, and performance-ready.
• Contribute to test plans, code reviews, risk assessments, and release sign-off.
• Mentor junior SDETs and drive a quality-first, performance-aware practice.

AI-First Engineering at Mimecast

The successful candidate will bring an AI-first but engineering-led mindset. That means knowing where AI can genuinely improve engineering outcomes, while keeping strong technical judgement, quality standards, and security awareness.

• Using AI to accelerate repetitive or analysis-heavy engineering tasks.
• Applying AI to improve test design, scenario coverage, code quality, defect diagnosis, and documentation.
• Helping teams move from ad hoc AI usage to repeatable, trusted engineering workflows.
• Coaching engineers on where AI is useful, where it is risky, and how to validate AI-generated output.
• Measuring the impact of AI adoption through productivity, quality, reliability, and speed-of-feedback improvements.
• Ensuring AI usage supports secure, responsible, and compliant engineering practices.

What You ll Bring

Knowledge, skills, and abilities for this role (we look for proven capability rather than a fixed number of years):

• Bachelor s or Master s degree in Computer Science, Engineering, or a related field.
• Extensive hands-on testing experience, with strong backend / platform ownership (not UI-only).
• Strong Java automation (JUnit, TestNG, RestAssured or equivalent).
• Strong REST APIs, SDKs, and Java microservices.
• Strong exposure to UI / E2E tools (Cypress or Playwright).
• Hands-on experience with AWS services.
• Proven Performance Engineering: load models, JMeter/Gatling/k6/Locust, bottleneck analysis, and actionable fixes.
• Solid CI/CD (Jenkins, GitLab) and Docker / Kubernetes.
• Strong debugging across logs, code, metrics, and traces.
• Passion for security, performance, reliability, and continuous improvement.

Good to have

• Experience with email security or threat-intelligence domains (SMTP, DKIM, SPF, DMARC).
• Experience validating event-driven pipelines…