{"schemaVersion":"jobsearcher.job.v1","id":"87acae44035258cd529e62ae","url":"https://jobsearcher.com/jobs/87acae44035258cd529e62ae","canonicalUrl":"https://jobsearcher.com/jobs/87acae44035258cd529e62ae","title":"Software Engineer - Runtime","description":"Cyberattacks on critical infrastructure, government, and private enterprises are at an all time high – and only growing more urgent by the day. Xage is a global leader in zero trust access and protection at the forefront of solving this pressing issue. We are pioneering a secure tomorrow by empowering organizations worldwide to connect anyone to anything, while delivering unparalleled defense against every cyber threat.\r\nWe have built tremendous momentum across governments and commercial enterprises around the world, and it’s just the beginning. Recognized by Forbes as one of America’s Best Startup Employers, Xage prioritizes creativity, collaboration, and innovation in pursuit of our mission. We are headquartered in Palo Alto, CA and have global teams across North America and EMEA.\r\nWe’re passionate about solving problems that have positive, real-world consequences for the lives of everyday people. We hope you’ll join us in the fight against cyberattacks and safeguarding critical infrastructure.\r\nAbout the Role\r\nWe are seeking aSenior Runtime & Systems Engineerto build the runtime security layer poweringAgent Sentry , the enforcement plane of our Zero Trust AI Gateway platform.\r\nWhile traditional AI security focuses on inspecting prompts and responses, Agent Sentry provides runtime visibility and control for autonomous AI agents wherever they execute—across Linux, macOS, and Windows environments. It monitors and governs agent activity including prompts, tool calls, API requests, generated outputs, filesystem access, process execution, shell/PowerShell activity, and agent-to-agent communications.\r\nIn this role, you will design and productionize OS-level interception, runtime monitoring, sandboxing, identity controls, and tamper-resistant audit infrastructure to secure AI agents operating across enterprise environments.\r\nYou will work across systems engineering, operating system security, distributed infrastructure, and zero-trust architecture to build the foundation for secure autonomous AI deployments.\r\nKey Responsibilities\r\nCross-Platform Runtime Security & Sandboxing\r\nBuild runtime monitoring and interception across Linux, macOS, and Windows using technologies such as eBPF, Endpoint Security Framework, ETW, and OS-level security APIs.\r\nCapture and analyze process execution, filesystem activity, network events, and agent behaviors.\r\nDevelop secure agent isolation using containers, OS-native sandboxes, and lightweight virtualization (containerd, runc, Firecracker, Wasm).\r\nDesign runtime controls to prevent unauthorized agent actions and reduce security risks.\r\nAgent Identity, Lifecycle & Policy Enforcement\r\nBuild agent identity infrastructure supporting registration, authentication, cryptographic attestation, short-lived credentials, and automated credential rotation.\r\nDevelop lifecycle governance for agent onboarding, authorization, monitoring, and decommissioning.\r\nIntegrate runtime telemetry with policy engines to enable real-time access decisions, inline enforcement, and automated containment.\r\nRequired Qualifications & Expertise\r\n3-5+ yearsbuilding production security, systems, or infrastructure software.\r\nStrong programming skills inGo, C/C++with experience developing high-performance, security-critical systems.\r\nExperience with OS internals, runtime security, kernel instrumentation, security telemetry, sandboxing, or container isolation.\r\nStrong understanding of host security, privilege escalation, runtime exploitation, and endpoint threats.\r\nExperience with eBPF, Linux kernel development, Windows Kernel, or macOS security frameworks.\r\nPreferred Qualifications\r\nExperience building EDR/XDR, runtime security, endpoint protection, or cloud workload security platforms.\r\nExperience securing AI agents, LLM applications, or autonomous systems.\r\nFamiliarity with Kubernetes security, service mesh, and cloud-native security.\r\nFamiliarity with zero-trust architectures, identity systems, PKI, mTLS, SPIFFE/SPIRE, OAuth/OIDC, and credential management.\r\nSalary Range: $140,000 – $170,000 p/yr + Equity\r\nWe will process visa transfers and immigration\r\nWork with founders and executives closely and participate in all aspects of company building\r\nEarly stage opportunity in a massive sized market with proven traction and growing rapidly#J-18808-Ljbffr","company":"Xage Security","rawCompany":"xage security","city":"Millbrae","state":"CA","isRemote":false,"isActive":true,"createdAt":"2026-11-04T02:10:01.085Z","occupations":[{"code":"15-1299.08","title":"Computer Systems Engineers/Architects","slug":"computer-systems-engineers-architects"},{"code":"15-1252.00","title":"Software Developers","slug":"software-developers"},{"code":"15-1299.05","title":"Information Security Engineers","slug":"information-security-engineers"}],"industries":[{"code":"541512","title":"Computer Systems Design Services","slug":"computer-systems-design-services"},{"code":"541511","title":"Custom Computer Programming Services","slug":"custom-computer-programming-services"},{"code":"513210","title":"Software Publishers","slug":"software-publishers"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"Software Engineer - Runtime","description":"Cyberattacks on critical infrastructure, government, and private enterprises are at an all time high – and only growing more urgent by the day. Xage is a global leader in zero trust access and protection at the forefront of solving this pressing issue. We are pioneering a secure tomorrow by empowering organizations worldwide to connect anyone to anything, while delivering unparalleled defense against every cyber threat.\r\nWe have built tremendous momentum across governments and commercial enterprises around the world, and it’s just the beginning. Recognized by Forbes as one of America’s Best Startup Employers, Xage prioritizes creativity, collaboration, and innovation in pursuit of our mission. We are headquartered in Palo Alto, CA and have global teams across North America and EMEA.\r\nWe’re passionate about solving problems that have positive, real-world consequences for the lives of everyday people. We hope you’ll join us in the fight against cyberattacks and safeguarding critical infrastructure.\r\nAbout the Role\r\nWe are seeking aSenior Runtime & Systems Engineerto build the runtime security layer poweringAgent Sentry , the enforcement plane of our Zero Trust AI Gateway platform.\r\nWhile traditional AI security focuses on inspecting prompts and responses, Agent Sentry provides runtime visibility and control for autonomous AI agents wherever they execute—across Linux, macOS, and Windows environments. It monitors and governs agent activity including prompts, tool calls, API requests, generated outputs, filesystem access, process execution, shell/PowerShell activity, and agent-to-agent communications.\r\nIn this role, you will design and productionize OS-level interception, runtime monitoring, sandboxing, identity controls, and tamper-resistant audit infrastructure to secure AI agents operating across enterprise environments.\r\nYou will work across systems engineering, operating system security, distributed infrastructure, and zero-trust architecture to build the foundation for secure autonomous AI deployments.\r\nKey Responsibilities\r\nCross-Platform Runtime Security & Sandboxing\r\nBuild runtime monitoring and interception across Linux, macOS, and Windows using technologies such as eBPF, Endpoint Security Framework, ETW, and OS-level security APIs.\r\nCapture and analyze process execution, filesystem activity, network events, and agent behaviors.\r\nDevelop secure agent isolation using containers, OS-native sandboxes, and lightweight virtualization (containerd, runc, Firecracker, Wasm).\r\nDesign runtime controls to prevent unauthorized agent actions and reduce security risks.\r\nAgent Identity, Lifecycle & Policy Enforcement\r\nBuild agent identity infrastructure supporting registration, authentication, cryptographic attestation, short-lived credentials, and automated credential rotation.\r\nDevelop lifecycle governance for agent onboarding, authorization, monitoring, and decommissioning.\r\nIntegrate runtime telemetry with policy engines to enable real-time access decisions, inline enforcement, and automated containment.\r\nRequired Qualifications & Expertise\r\n3-5+ yearsbuilding production security, systems, or infrastructure software.\r\nStrong programming skills inGo, C/C++with experience developing high-performance, security-critical systems.\r\nExperience with OS internals, runtime security, kernel instrumentation, security telemetry, sandboxing, or container isolation.\r\nStrong understanding of host security, privilege escalation, runtime exploitation, and endpoint threats.\r\nExperience with eBPF, Linux kernel development, Windows Kernel, or macOS security frameworks.\r\nPreferred Qualifications\r\nExperience building EDR/XDR, runtime security, endpoint protection, or cloud workload security platforms.\r\nExperience securing AI agents, LLM applications, or autonomous systems.\r\nFamiliarity with Kubernetes security, service mesh, and cloud-native security.\r\nFamiliarity with zero-trust architectures, identity systems, PKI, mTLS, SPIFFE/SPIRE, OAuth/OIDC, and credential management.\r\nSalary Range: $140,000 – $170,000 p/yr + Equity\r\nWe will process visa transfers and immigration\r\nWork with founders and executives closely and participate in all aspects of company building\r\nEarly stage opportunity in a massive sized market with proven traction and growing rapidly#J-18808-Ljbffr","datePosted":"2026-11-04T02:10:01.085Z","dateModified":"2026-11-04T02:10:01.085Z","hiringOrganization":{"@type":"Organization","name":"Xage Security","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"Millbrae","addressRegion":"CA","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"87acae44035258cd529e62ae"},"url":"https://jobsearcher.com/jobs/87acae44035258cd529e62ae"}}