QA Engineer

Responsibilities

• Design and develop automated test cases for validating DPI (Deep Packet Inspection) engines and secure network traffic inspection.
• Testing real-world client/router/cloud interactions for deep testing of L2–L7 network behavior.
• Validate TLS/SSL traffic inspection and network traffic classification techniques.
• Write tests to ensure accurate handling of malformed packets, evasive traffic, and intrusion detection patterns.
• Simulate security vulnerabilities (e.g., DNS tunneling, spoofing, port scanning) and evaluate detection effectiveness.
• Leverage and extend DPI tools (e.g., nDPI, Suricata, Zeek) for custom validation use cases.
• Partner with firmware developers to validate & test the access control logic.

Qualifications

• 8+ years of experience as an SDET, Security QA Engineer, or related role in networking/security domains.
• Strong programming/scripting in Python for test automation and tooling.
• Deep understanding of TCP/IP, UDP, DNS, TLS, HTTP/HTTPS, NAT, VPNs, and tunneling protocols.
• Hands-on with packet sniffers (e.g., Wireshark) and PCAP analysis.
• Solid grasp of firewall behavior, DPI concepts, SSL inspection, and secure communication protocols.
• Strong debugging skills: ability to spot design flaws, race conditions, and performance bottlenecks in complex architectures
• Ability to break software systems in creative and useful ways

Preferred Qualifications

• Familiarity with nDPI, Suricata or commercial DPI stacks.
• Exposure to MITM techniques, threat simulation frameworks
• Prior experience testing IoT or Wi-Fi edge devices (e.g., OpenWRT, OpenSync, embedded Linux).
• Background in cybersecurity, network security, or traffic classification.
• Experience in testing cloud-native networking products

Education: Bachelor’s or Master’s degree in Computer Science, Computer Engineering, Information Systems, or a related technical field, or equivalent practical experience.