Lead QA Engineer — Network Protocols & DPI

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Role Summary

IP networking, protocol behavior, and Deep Packet Inspection (DPI)

What You’ll Do

• Design, author, and execute

  manual and automated

  test cases for L2/L3/L4–L7 features and DPI classification engines. 
• Validate core protocols:

  TCP, UDP, HTTP/HTTPS, FTP, DNS, DHCP, SIP, ICMP

  (plus negative/edge scenarios: retransmissions, fragmentation, timeouts, MTU/MSS, packet reordering). 
• Perform

  Deep Packet Inspection

  tests for signature accuracy, false-positive/negative rates, and protocol/APP identification. 
• Build and run

  performance/scale

  tests (throughput, CPS/SPS, concurrent sessions, latency/jitter/loss) using traffic generators. 
• Capture and analyze traffic with

  tcpdump/Wireshark/tshark

  ; create precise

  capture/display filters

  , annotate traces, and file actionable defects with MRE steps and RFC references. 
• Automate routine/system tests using

  Python/Bash

  (e.g., scapy/pytest) and integrate with CI where practical. 
• Maintain lab setups: switches/routers/firewalls/network appliances; manage images, configs, topologies, and golden baselines. 
• Collaborate with Dev/PM/SRE on test strategy, coverage, and release criteria; contribute to

  test plans, exit reports,

  and risk assessments. 
• Ensure compliance with relevant

  RFCs/industry standards

  ; document test evidence. 

Must-Have Qualifications

• 6–9 years

  in QA for

  networking/telecom products

  (not web/app UI testing). 
• Strong grasp of

  OSI model, L2/L3

  , IPv4/IPv6, VLANs, NAT, routing basics; deep

  TCP

  internals (state machine, handshake, retransmission, flow/congestion control). 
• Practical DPI knowledge: signatures/classifiers, payload parsing, evasion/obfuscation scenarios. 
• Tools:

  Wireshark, tcpdump/tshark, iperf

  , and at least one traffic generator (

  Ixia/Keysight, Spirent

  , or equivalent). 
• Comfortable on

  Linux

  (iproute2, systemd, networking namespaces), shell scripting, and

  Python

  for test automation/log parsing/pcap handling. 
• Experience with

  Git

  , issue trackers (e.g.,

  Jira

  ), and test management. 
• Excellent defect reporting and communication skills. 

Nice to Have

• Knowledge of

  firewalls/VPN/QoS/load balancers

  and security protocols (IPsec/TLS). 
• CI/CD and container networking (Docker/K8s), Robot/pytest. 
• Certifications:

  CCNA/CCNP

  ,

  ISTQB

  (or equivalent).