# ARUN SINGH > Principal Software Engineer @ Vercara | Security Testing Location: Fremont, California, United States Profile: https://flows.cv/arunsingh With multiple years of experience in testing network and security features, I am a Principal Software Engineer (Test) at Vercara, a leading provider of web application security solutions. I design and execute test plans, identify and verify bugs, and document test results to ensure a high-quality product. My core competencies include machine learning (ML) and BOT security, web application firewall (WAF), TCP/IP protocols, REST API, Python, and AWS. I have tested BOT security based on bot-signatures, bot-trap, device-fingerprint, rate-limiting, and captcha to detect and mitigate automated bot attacks. I have also tested ML-based security detection and mitigation to prevent behavior-based attacks such as account takeover, website scanning, content scraping, and unusually high upload/download volume. Additionally, I have performed WAF security testing such as SQL injection, XSS attacks, buffer overflow, and WAF signatures to protect web applications. ## Work Experience ### Principal Software Engineer (Test ) @ Vercara Jan 2021 – Present | San Jose, California, United States • Company started as a security division of 'Neustar, Inc', and now as 'Vercara' ### Software Engineer in Test III @ Neustar, Inc. Jan 2019 – Jan 2021 | San Jose • Designing test plans, executing tests, and identifying bugs and document test results to ensure a high-quality product. • Testing BOT Security based on bot-signatures, bot-trap, device-fingerprint, rate-limiting, captcha to detect/mitigate automated bot attacks and protect web application. • Testing BOT Machine Learning(ML) based Application security detection/mitigation to prevent behavior-based attacks like account takeover, website scanning, content scraping, Unusually High Upload/Download volume and much more. • Performing WAF Security Testing such as SQL Injection, XSS Attacks, POST Body Limit, Buffer Overflow, CSRF and WAF signatures to protect web applications. • Testing TCP/IP Layer3/Layer4 DDOS Appliance security features such as Source/Destination Rate Limits, Flood Attack etc. • Utilizing network traffic tools curl, hping, scapy, wireshark and tcpdump. • Automating functional sanity and regression test cases using Postman Collection APIs and Python Script • Build and maintain a test network (Linux clients/servers, Security Appliance, switches, routers and IXIA/Breaking Point) • Perform scale and performance testing of Network Security features using Traffic generators such as Ixia and Breaking point. ### Test Engineer III @ F5 Networks Jan 2016 – Jan 2019 | San Francisco Bay Area • Understand Feature Requirements, Design test concepts/plans, execute tests, identify/verify bugs and documenting test results for security features. • Perform Functional testing of security features related to F5’s Advanced Firewall Manager (AFM) module. • Integration testing of various F5 Networks security features such as IPS, IP Intelligence, NAT FW etc. • Automate functional test cases using REST API and Python with help of Pytest and SDK Framework ### Sr Software QA (Network Testing) @ A10 Networks Jan 2015 – Jan 2016 | San Jose • A10 Feature Verification especially for Network Security DataCenter FireWall & Server Load Balancers •Write design documents/unit test plans for software projects related to multiple A10 product/features • Finding software defective at early stage of software release (EA or initial GA) to assure SW quality for L4-7 application delivery (TCP/UDP/HTTP, real-time traffic) and Load balancers • Install, configure and maintain network test environment (L2/L3 Devices,Server Load Balancers,Linux System,VMware etc) • Conduct Load/Stress(Ixia) Testing of A10 Network devices to monitor/evaluate network performance for a real scenarios ### Network Lab Engineer @ AT&T Jan 2011 – Jan 2015 | San Ramon ,CA •Conduct feature testing for AT&T multiple managed VPN services such as DMVPN and EZVPN. •Configuring and performance testing Virtualized Routing using Cisco Cloud Service Router(CSR 1000V) •Build and maintain the lab with Nexus based switching infrastructure, Cisco UCS, various Cisco ASR 100x, ISR G2 models, T3 and T1 lines, DSL lines. •Testing IPSEC/GRE tunnels, Routing(EIGRP,OSPF,BGP),Zone Based Firewall, Digital Cert,CBAC •Performance/Load Testing using IXIA/Spirent traffic generators for Cisco ASR and ISR G2 routers •Perform Network Monitoring using Flex-Netflow and Device Management based on SNMP/Syslog •Design and implement Layer 2 Switching - VLANs, 802.1Q VLAN Trunking, VTP, STP, Port Fast, Port Security, Inter- VLAN Routing and Ether Channel for network redundancy on Nexus 2248TP and 5548UP datacenter switches •Interact with vendors with specific needs and tested product performance •Proficient in writing Engineering and Technical Design and Troubleshooting guides •Test ISR 3G/4G -HSPA/LTE and Cisco WAP based on 802.11b/g/n to provide highly available, reliable connection ### Internship - Network Service Engineer @ Chicago Mercantile Exchange (CME Group), Chicago,IL Jan 2010 – Jan 2010 | Chicago • Worked on successful projects (WAN Optimization/Global Backbone Network) for Lab design and setup using Cisco products,WANOptimizer,Spirent Delay generator and Monitoring server • Design, administer multiple VLAN IP networks,PIX firewall,VPN,IOS code upgrade, configuring Cisco switches and routers like 2651, 2950, 3560, 6504 and 6509. • Perform System stability and compatibility test of various Cisco Devices under static or dynamic traffic load using Spirent Packet generator and analyzer in development lab prior to deployment. • Responsibilities include configuring, troubleshooting and responding to customer probles in timely manner, also monitored all the network devices globally and Configuring Site-to-Site VPN, Client-to-Site VPN, IPSec Tunnels. Network Monitoring using SNMP tools such as Solar Winds and Whatsupgold ### Network Lab Engineer/Course Online Tech. @ DePaul University Jan 2008 – Jan 2010 • Design and test a lab for Switch Ports Configuration, VLANs, VTP and Spanning Tree Protocol along with Wireless attacks and sniffing techniques on Linux and Windows OS. Provide technical support to all CDM students including online learners for lab environment. • Network Cabling,Device installation,IOS upgrade,Batch Imaging and Network troubleshooting involving router,switches,FW and terminal server. • Provided hardware and software troubleshooting for PC and Apple computers. Supported installation and upgrade on Windows based software, modify and replace server hardware, components • Monitoring Network devices and Server for Security purposes along with working on Microsoft SQL Server databases. Also performed Lab inventory physically or remotely by telnet session for all network devices such as routers, switches, firewall and terminal servers. • Troubleshoot networks, quality testing high precision audio, video and whiteboard capture devices ### Internship - WAN Analysis @ The Warranty Group Jan 2009 – Jan 2009 •Responsibilities included configuring, troubleshooting and monitoring all the network devices globally and Network Monitoring using SNMP tools such as Solar Winds and Whatsupgold. •Network Security: Successfully worked on Firewall Access Control List (ACL), and NAT/PAT rules •Designed and Configured the WAN infrastructure, consisting of multiple T1 and T3 lines, Cisco routers, Cisco switches, Load balancers, Dell and Sun servers. Analyze WAN traffic using sniffer to monitor and to isolate video conference traffic ## Education ### Masters in Networks and Telecommunication. DePaul University ### Master of Science in Networks and Telecommunication DePaul University ### Bachelor in Electronics & Telecommunication Thakur College Of Engineering and Technology ## Contact & Social - LinkedIn: https://linkedin.com/in/arunshyamrajsingh --- Source: https://flows.cv/arunsingh JSON Resume: https://flows.cv/arunsingh/resume.json Last updated: 2026-04-12