Sr Software Development Engineer in Test (SDET) - Network Security (Apps) at Corelight

, England, United Kingdom -

Full Time

Start Date

Immediate

Expiry Date

15 May, 26

Salary

188000.0

Posted On

15 Feb, 26

Experience

5 year(s) or above

Remote Job

Yes

Telecommute

Yes

Sponsor Visa

Skills

Python, Bash, Ansible, Terraform, Zeek, Suricata, YARA, Snort, Sigma, TCP/IP, HTTP, DNS, SSL/TLS, Git, Linux Administration, Cloud Platforms

Industry

Computer and Network Security

Description

Senior Software Development Engineer in Test (SDET) - Network Security Do you want to help make the world safe from cyber attack? At Corelight, we believe that the best approach to cybersecurity risk starts with the network. Attackers can evade endpoint detection, firewalls and many other technologies - but they can’t avoid leaving digital footprints on the networks they traverse. Built on open-source innovations from Zeek, Suricata and YARA and refined through years of real-world use, Corelight transforms network footprints from physical, virtual and cloud networks into actionable insights. Our customers use these insights to speed incident response and proactively hunt for threats. As a Senior SDET at Corelight, you will be the architect of the trust we build with our customers. In this role, you aren’t just "checking code"—you are building the sophisticated automation and infrastructure that validates our cutting-edge network security applications. By simulating complex network traffic and stress-testing our Zeek, Suricata, and YARA integrations, you ensure that our defenders have the most reliable tools in the industry to disrupt global cyber attacks. Specific Responsibilities: Architect Automation Frameworks: Design, develop, and maintain scalable automated test frameworks and scripts using high-proficiency Python and Bash. Build Infrastructure as Code: Implement and manage dynamic test environments across major cloud platforms (AWS, Azure, and GCP) using Ansible and Terraform. Validate Security Logic: Develop security-focused integration tests to ensure the peak functionality of core tools including Zeek, Suricata, and YARA. Automate Artifact Deployment: Streamline the deployment and configuration of critical test artifacts, including Snort and Sigma rule sets. Network Traffic Analysis: Perform deep-dive analysis of network protocols (TCP/IP, HTTP, DNS, SSL/TLS) to design robust, realistic test scenarios that mirror real-world production constraints. Integrate CI/CD: Manage test code and environments within Git, ensuring seamless integration into our continuous delivery pipelines. Knowledge, Skills, and Abilities needed to be successful: Action-Oriented Problem Solving: You thrive in fast-paced environments and can drive testing efforts across multiple projects, even when timelines are ambiguous. Global Collaboration: You are a proactive communicator who enjoys working with geographically distributed teams across the USA and India. Cross-Functional Partnership: You can effectively partner with Engineering, Product Management, and QE teams to ensure total test coverage. Technical Leadership: You take ownership of the "User Experience" from a quality perspective, ensuring our products scale as our customers' codebases grow. Qualifications/Requirements: Industry Experience: 5–10 years of experience in an SDET or heavy automation role. Automation Mastery: High proficiency in Python and Bash for framework development and utility scripting. Cloud & IaC Expertise: Hands-on experience with at least one major cloud provider (AWS, Azure, GCP) and Infrastructure as Code tools (Ansible/Terraform). Linux Administration: Solid experience with RHEL/Ubuntu environments for setting up complex test beds. Network Protocol Depth: Strong working knowledge of TCP/IP, HTTP, DNS, SSL/TLS, Kerberos, and SMB. Differentiators: Experience with Docker/Kubernetes, Zeek scripting, CI/CD optimization, or prior exposure to Corelight Fleet Manager. Education: Bachelor of Science or equivalent experience Fueled by investments from top-tier venture capital organizations such as Crowdstrike, Accel and Insight, Corelight is the fastest growing network detection and response platform in the industry. Our customers trust us to protect mission-critical assets in leading enterprises, government, and research institutions worldwide. We are leading the way with AI-assisted workflows, machine learning models, cloud security and SaaS-based solutions to arm defenders with the tools and knowledge they need to disrupt cyber attacks. Our team of passionate innovators are dedicated to solving some of the toughest challenges in cybersecurity, while fostering a collaborative, inclusive, and growth-oriented culture. Corelight is committed to a geographically distributed yet connected employee base with employees working from home and office locations around the world. At Corelight, we take pride in the diversity of our backgrounds and perspectives, and we are committed to fostering an inclusive environment that strengthens our company. By embracing a wide range of experiences, backgrounds, neurodiversity, talents, and approaches to problem-solving, we aim to create a workplace where everyone can thrive and contribute their best. We are looking forward to meeting you. Check us out at www.corelight.com Notice of Pay Transparency: The compensation for this position may vary depending on factors such as your location, skills and experience. Depending on the nature and seniority of the role, a percentage of compensation may come in the form of a commission-based or discretionary bonus. Equity and additional benefits will also be awarded. Compensation Range $153,000—$188,000 USD

Responsibilities

The Senior SDET will architect, develop, and maintain scalable automated test frameworks using Python and Bash, while building Infrastructure as Code using Ansible and Terraform for dynamic cloud test environments. Responsibilities also include validating security logic for core tools like Zeek and Suricata and automating the deployment of critical test artifacts.