Sr. Software Engineer

What We Do
Shape the future of cybersecurity at Forescout. Each day cyberattacks threaten to disrupt hospitals, power grids, financial systems, and the infrastructure we all depend on. At Forescout, we build the defenses that keep civilization running smoothly in an increasingly connected world.
For more than 25 years, Fortune 100 organizations, government agencies, and large enterprises have trusted Forescout as their foundation to manage cyber risk, ensure compliance, and mitigate threats. From power grids and healthcare systems to financial networks and transportation hubs, Forescout protects the critical infrastructure of our modern world.
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(Only US Citizens and US Permanent Residents will be considered for this position.)
(Hybrid role Tuesday through Thursday in our Plano office.)
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What You Will Do
Ship security and network features that run in complex production environments at global scale
Build the test harnesses, simulators and lab tooling that make changes to the plugins safe
Modernize legacy components, upgrade dependencies and platforms, and harden security, without breaking customer behavior
Bring agentic development practices into this team, building on what other Forescout teams already do, and help set the standards for reviewing and testing AI-generated changes
Help define the networking and authentication roadmap with senior technical leaders and product management
Work with QA, support, documentation and field teams to ship and troubleshoot customer-facing releases
Learn new protocols and vendor systems quickly, and explain them clearly to others
What You Bring To Forescout
Required
8+ years delivering production software, including some work on large or long-lived codebases you did not write
Strong in at least two of Java, Python, C/C++, Perl or JavaScript. We will teach you the Perl you need, and comfort reading unfamiliar languages matters more than prior Perl experience.
A habit of building safety nets before changing risky code: characterization tests, test doubles, simulators and CI
Hands-on experience using AI coding assistants or agents on real production code, and a clear view of where they help and where they need human review
Solid fundamentals in networked systems: TCP/IP, HTTP, TLS and client/server debugging
Strong debugging skills, especially when the cause is in a system you cannot fully see (customer environments, third-party devices, vendor APIs)
Clear written and verbal communication, and effective work across engineering, QA, product and support
Self-directed, with willingness to learn new areas and work across component boundaries
Nice To Have (not required)
Experience with RADIUS, TACACS+, 802.1X/EAP, LDAP/AD or other AAA protocols
Experience with switch, wireless controller or other network device integration (SNMP, CLI, vendor REST APIs)
Experience with Linux services, containers (Docker, Compose, Testcontainers) or packet-level tools
Experience with Spring Boot, Kafka,