Concentric AI
Website:
concentric.ai
Job details:
Role Overview
We are looking for a QA Engineer with strong manual testing experience to validate an Endpoint DLP/security product across Windows and macOS.
The role will focus on end-to-end functional, integration, network, security, and interoperability testing. The engineer should have a good understanding of Data Loss Prevention (DLP), endpoint security, and networking concepts and should be comfortable troubleshooting issues using logs, network captures, and system-level tools.
Key Responsibilities
- Perform end-to-end testing of the Endpoint DLP product on Windows and macOS.
- Validate agent installation, uninstallation, upgrade, authentication, enrolment, configuration, and policy synchronization.
- Test DLP policies for allow/block scenarios using sensitive and non-sensitive data.
- Validate DLP detection for data such as PII, PCI, PHI, credentials/secrets, source code, and confidential information.
- Test data movement through prompts, file uploads, and other supported application workflows.
- Validate traffic interception and routing between the endpoint, secure tunnel, cloud gateway, DLP services, and destination applications.
- Verify that monitored application traffic is correctly intercepted while unrelated traffic is not impacted.
- Perform network-level troubleshooting using tools such as Wireshark, tcpdump, netstat, nslookup/dig, curl, ping, traceroute, or equivalent Windows/macOS utilities.
- Validate WireGuard/VPN tunnel connectivity, routing, DNS, TLS/certificate behavior, and network recovery scenarios.
- Analyze endpoint, agent, service, driver/network extension, and cloud-side logs to identify the source of failures.
- Perform negative and recovery testing including service crashes, network disconnect/reconnect, reboot, sleep/wake, authentication failures, backend unavailability, and configuration failures.
- Perform compatibility and interoperability testing with enterprise security products such as Zscaler, CrowdStrike, VPN/SASE, EDR, or similar endpoint/network security solutions.
- Execute functional, integration, regression, exploratory, and release validation.
- Create and maintain detailed test cases in TestRail or similar test-management tools.
- Report defects with clear reproduction steps, logs, screenshots, packet captures, and other supporting evidence.
- Work closely with developers and automation engineers to identify scenarios suitable for regression automation.
Required Skills
- 10+ years of QA/testing experience, preferably with endpoint, networking, cybersecurity, or enterprise security products.
- Strong hands-on experience in manual testing and end-to-end system testing.
- Good understanding of Data Loss Prevention (DLP) concepts, including policies, sensitive-data detection, allow/block enforcement, and data exfiltration scenarios.
- Strong understanding of networking fundamentals, including:
- TCP/IP and UDP
- DNS
- HTTP/HTTPS
- TLS/SSL and certificates
- Routing
- VPN/tunneling
- Proxy concepts
- Network interfaces
- Experience troubleshooting network traffic using Wireshark/tcpdump or similar packet-capture tools.
- Good working knowledge of Windows and macOS.
- Comfortable working with Windows services/processes and macOS processes, permissions, certificates, and system/network components.
- Ability to read and analyze application/service logs.
- Experience testing APIs using Postman, curl, or similar tools.
- Good understanding of client-server and cloud-based architectures.
- Strong debugging and root-cause-analysis skills.
Good to Have
Experience in any of the following would be an advantage:
- Endpoint security products such as DLP, EDR, VPN, SASE, CASB, or Secure Web Gateway.
- Zscaler, CrowdStrike, Netskope, Microsoft Defender, or similar security products.
- WireGuard or other VPN/tunneling technologies.
- TLS interception / SSL inspection.
- Windows drivers or network filtering concepts.
- macOS Network/System Extensions.
- Cloud Gateway or proxy-based architectures.
- Basic Linux knowledge.
- Basic scripting knowledge in Python, Bash, or PowerShell.
- Jira, Confluence, and TestRail.
- Testing desktop applications and enterprise endpoint agents.
What We Are Looking For
We need someone comfortable going beyond standard UI testing. The engineer should be able to investigate a failure across the complete flow—from the desktop application and endpoint agent to network traffic, Gateway, DLP decision, and final allow/block behavior—and work with developers to identify where the issue occurred.
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