Senior Software Engineer | Security

Company: ExtraHop
Location: Elkins Park
Posted on: January 21, 2026

Job Description:

ExtraHop is reinventing Network Detection and Response (NDR) to help enterprises and organziations stay ahead of emerging threats with unmatched network visibility, context, and control. Today’s attackers bypass traditional security defenses through identity-based entry, move invisibly across cloud, on-premise, and data center networks using encryption and trusted applications, and exploit and exit whenever they want. But all of that movement is visible on the network if you can see it. By combining the power of NDR with Network Performance Management (NPM), Intrusion Detection Systems (IDS), and forensics in a single, integrated platform, ExtraHop can decrypt and unlock complete packet-level data at wire speed, analyze and correlate it across all your networks, applications, devices, and users with cloud-scale machine learning, and provide a single interface to the SOC to detect, investigate, and remediate modern cyber risks in real time. Position Summary We are ExtraHop. Were on a mission to provide security teams with the intelligence they need to confront and stop advanced threats like supply chain attacks, zero day exploits, and ransomware attacks. Cyber attackers still have the advantage. We’re taking it back with creativity, intellectual curiosity, and a sense of humor. Are you ready to help us reclaim the upper hand We are seeking a highly skilled and motivated Senior Software Engineer | Security with a strong software and detection engineering background to join our Detection Engineering (DE) team and help expand ExtraHop’s industry leading detection coverage. An ideal candidate will have strong software engineering, networking, and cybersecurity fundamentals as well as knowledge of modern Identity and Access Management (IAM). This position works closely with security researchers and data scientists to develop cutting edge network threat detections that leverage rule-based network observations as well as ML-powered anomaly detections. As a Senior Software Engineer | Security, you will be working as part of a team dedicated to delivering industry leading detection capabilities. You will be expected to work with a high level of autonomy, to mentor other team members, and to demonstrate a high level of ownership of your areas of responsibility. We offer an engaging and innovative environment in which people are encouraged and supported to collaborate on industry-leading technology and create a world-class engineering team, while they develop and enrich their individual growth. We believe in actively investing in a diverse engineering organization. We are seeking highly talented software engineers from all backgrounds, who bring in their own perspectives, influences, and experiences. Are you as passionate as we are about positive culture and amazing technology? If so, we can’t wait to chat with you. ExtraHop R&D supports fully-flexible work options that includes full time onsite, hybrid, and fully remote working arrangements. With the exception of a few roles that require physical access, we believe in supporting you in making the choice that works best for you and makes the team successful. Key Responsibilities • Detection Engineering: o Develop network threat detectors by leveraging rule-based and ML-based detection strategies o Reproduce attacks in a lab environment using live tools and recorded PCAP traffic, and perform threat hunts on aggregated log data, in order to identify malicious behaviors and develop techniques to detect them o Collaborate with Threat Research and Data Science teams to gain insight on attacker techniques and take advantage of the latest machine learning models to detect attacker behavior o Work with infrastructure teams to help develop and improve tools that Detection Engineering and Threat Research teams use in developing and testing detections. • Mentorship: o Mentor and coach other Security Engineers regarding detector development and network threats o Actively participate in code review to ensure quality and uplevel other engineers Required Qualifications • 5 years of experience in software and/or detection engineering in a team environment • Experience developing and deploying code for enterprise software applications with emphasis on code quality and maintainability • In-depth knowledge of networking fundamentals, including the OSI model and excellent working knowledge of the key protocols from Layer 2 through Layer 7 • Experience working with modern Identity and Access Management (IAM) using SAML and OIDC • Experience with network-oriented security tools such as Wireshark, Tshark, tcpdump, Suricata, Snort, or other packet capture/analysis tools • Work cooperatively with others within the organization and other cross-functional stakeholders. • Work well in fast-paced, high-stress environments. • Has predictable, reliable attendance. Preferred Qualifications • Proficiency in Javascript and Python • Awareness of current network-based attacks and detection strategies, with a focus on post-exploitation, lateral movement, C2, and exfiltration techniques • In-depth knowledge of Windows protocols and attack techniques • Experience with threat hunting, purple teaming, and log/traffic analysis

Keywords: ExtraHop, Mount Vernon , Senior Software Engineer | Security, IT / Software / Systems , Elkins Park, New York