Senior Security Engineer - Infrastructure Security

CLEAR builds secure identity technology for both digital and physical spaces. With more than 38 million members and a growing global partner network, CLEAR’s platform helps people move through airports, stadiums, workplaces, and daily routines with greater safety and ease. Role Overview The Senior Security Engineer on the Infrastructure Security Engineering …

At StubHub, we are committed to revolutionizing the global live event experience. Our goal is to ensure that every fan—from first-time attendees to seasoned concert-goers—enjoys a seamless journey from ticket discovery to event entry. We also prioritize our sellers, whether they are individual fans or large-scale promoters, providing a secure and convenient platform for ticket sales to millions of users worldwide.About the Team:Join the StubHub Cloud & Infrastructure Security Engineering team, where we are looking for a seasoned engineer to fortify our security framework in the cloud and infrastructure sectors. The ideal candidate will have a robust background in cloud security architecture, network security, and infrastructure automation, along with knowledge of container and operating system security.

About TraversalTraversal stands at the forefront of AI Site Reliability Engineering (SRE), trusted by leading enterprises globally to troubleshoot, remediate, and preemptively manage complex production incidents. Our mission is to liberate engineers from continuous firefighting, allowing them to channel their talents into innovative, impactful work.With deep roots in AI research, we are committed to establishing the premier AI agent lab for enterprises. Our greatest asset is our team, comprised of exceptionally skilled and kind individuals, including researchers from prestigious institutions such as MIT, Harvard, and Berkeley, alongside world-class engineers from industry leaders like Citadel Securities, Cockroach Labs, Datadog, and more. Together, we tackle one of AI's most challenging problems.The RoleAs an Infrastructure & Application Security Engineer at Traversal, you will be instrumental in constructing our security program from the ground up. This hands-on role is ideal for someone passionate about security, enthusiastic about Kubernetes, and eager to build—transforming risk into automated, measurable, and low-friction guardrails that engineers can leverage daily. You will work at the intersection of Kubernetes security, service-to-service security (including Istio Ambient), and application security for Python APIs within a multi-tenant SaaS environment, collaborating closely across engineering teams with a focus on deploying mechanisms rather than creating presentations.

Join Palantir Technologies as a Product Infrastructure Security Engineer in New York. In this role, you will play a critical part in securing our infrastructure, ensuring that our products and services maintain the highest standards of security and reliability. You will work with top-tier engineering teams to identify vulnerabilities, implement robust security measures, and contribute to the overall security architecture of our systems.

Role overview modal seeks an Infrastructure Security Engineer based in New York. The position centers on safeguarding digital infrastructure and securing core systems that support daily operations. Key responsibilities Design and apply security controls across infrastructure components Perform risk assessments to spot and address vulnerabilities Monitor compliance with industry regulations and standards Strengthen systems to withstand new and evolving security threats Impact This role plays a direct part in protecting modal’s operations. By reducing risks and supporting secure growth, the Infrastructure Security Engineer helps maintain the safety and integrity of the company’s technology foundation.

Join Chainalysis as a Security Engineer focused on Product Infrastructure, where you will play a crucial role in securing our innovative technology solutions. Collaborate with cross-functional teams to develop robust security practices and ensure the integrity of our products.

Join Scale AI as a talented Infrastructure Security Engineer, where you'll play a pivotal role in safeguarding the integrity and security of our platform. This position focuses on securing expansive cloud environments, managing and fortifying various compute clusters, and reviewing infrastructure as code. Your proficiency in cloud security, infrastructure automation, and advanced security practices will be crucial in upholding and advancing our security framework.Your responsibilities include:Securing infrastructure across major cloud hosting platforms (e.g., AWS, Azure, GCP).Implementing and maintaining comprehensive security configurations and policies for cloud environments.Conducting regular security assessments and audits to identify vulnerabilities and propose enhancements.Developing and enforcing security best practices for infrastructure automation and orchestration.Collaborating with Developer Experience, IT, and product teams to integrate security into every phase of the infrastructure lifecycle.Reviewing and securing infrastructure as code (e.g., Terraform, CloudFormation).Mentoring team members on infrastructure security best practices and emerging threats.

About the Role Sigma Computing is seeking a Senior Security Engineer II focused on Cloud & Data Security to help safeguard our large-scale, cloud-native SaaS platform. This position centers on engineering: building security solutions, not just operating existing tools. The role calls for a subject matter expert in cloud security architecture. Collaboration with Engineering, Security, and Product teams is key, as is designing scalable controls that support business growth. Responsibilities include creating secure architectures, integrating controls into infrastructure-as-code, and setting up automated guardrails so teams can move quickly without waiting for manual security sign-offs. This is a hands-on position for someone who thrives in complex cloud environments, values automation, and knows how to scale security for a growing SaaS company. What You Will Do Architectural Leadership: Work closely with infrastructure and engineering teams to embed security into development workflows. Lead technical discussions that shape security strategy and initiatives. Multi-Cloud Engineering: Design, implement, and refine Sigma’s cloud security across AWS, GCP, and Azure, using deep architectural expertise. Threat Modeling & Incident Response: Conduct threat modeling for cloud environments and handle incident response, including investigation and remediation of malicious activity. Identity & Access Management: Develop strategies for IAM and privileged access (RBAC/ABAC, federation, least privilege, cross-account access). Remove standing privileges and long-lived credentials, and promote zero-trust and privileged access controls across IaaS and SaaS. Cloud Data Security Controls: Implement data classification, encryption/KMS, masking/tokenization, access governance, retention and deletion policies, and reduce exfiltration risks across APIs and data pipelines. Automated Remediation Workflows: Build automated responses for recurring cloud misconfigurations, drift, and policy violations to improve operational efficiency and response times. Security Stack Management: Deploy and manage cloud-native services, including CSPM, CNAPP, DSPM, SIEM, DLP, WAF, Kubernetes, and container security tools. Network Defense: Evaluate and implement zero-trust network security measures. Location: New York City, NY

CoreWeave is the definitive cloud solution for AI™. Designed by innovators for innovators, we provide a robust platform of technology, tools, and expert teams that empower trailblazers to confidently build and scale AI solutions. Trusted by top AI research labs, startups, and global enterprises, CoreWeave merges exceptional infrastructure performance with profound technical know-how to expedite breakthroughs and transform computing power into actionable capability. Established in 2017, CoreWeave became publicly traded (Nasdaq: CRWV) in March 2025. Discover more at www.coreweave.com.What You Will Do:The Enterprise Security team at CoreWeave is tasked with safeguarding our daily operations—covering identity, endpoints, networks, and SaaS—ensuring the company can maintain agility without sacrificing security. This team is accountable for the controls, guardrails, and automation that protect our workforce, contractors, and vital business applications within a cloud-native environment.If you're passionate about zero trust, phishing-resistant MFA, and creating secure-by-default experiences that enhance productivity, this is the perfect team for you.About the Role:As a Senior Security Engineer, Enterprise Security, you will architect and implement the security measures that support CoreWeave's workforce and enterprise framework. You will spearhead projects related to identity, access management, device and endpoint security, and SaaS security—collaborating closely with IT Engineering, Endpoint, Network, and various security teams.Your routine will involve a blend of hands-on engineering (coding, building integrations, fine-tuning controls) and architecture and program leadership (setting standards, defining frameworks, and encouraging adoption across teams). You will be accountable for transforming high-level goals—such as “implementing zero trust for workforce access” or “deploying phishing-resistant MFA at scale”—into tangible designs, automation, and quantifiable risk reduction.In this position, you will:Develop advanced identity and access controls

At January, we are on a mission to revolutionize consumer finance from the ground up. By personalizing interactions and optimizing decision-making throughout all stages of consumer credit, we empower both consumers and creditors, ensuring that credit is fair, accessible, and tailored to individual needs.As a Lead Security Engineer, you will redefine security standards in an industry where trust has been significantly compromised. This is a unique opportunity to join us at a pivotal moment: we have established the hard-earned trust of leading financial institutions, and now you will create the security framework that extends this trust to millions of consumers.You will design and implement a dual trust architecture, safeguarding both consumer-facing experiences and robust enterprise systems. You will tackle technical challenges that are unparalleled in the industry, such as privacy-preserving data systems, compliance automation across multiple jurisdictions, and AI-driven decision-making processes. Your influence will shape our security strategy and culture from the ground up, demonstrating that security is not merely an overhead cost, but a competitive advantage that drives enterprise partnerships and market growth.Your ImpactTransform security into a competitive edge: Position January's security as a key differentiator that attracts banks and enterprises, unlocking Tier 1 partnerships and deals that competitors cannot secure.Promote security-by-design in product and application development: Collaborate with product and engineering teams to identify critical risks early in the process, focusing on application security across frontend, Flask services, and databases. Integrate security into the discovery and design phases, ensuring secure development patterns are embedded in workflows.Design systems for bank-grade data protection: Create and enforce data classification, encryption, and access control mechanisms that comply with regulatory standards, ensuring sensitive data remains within authorized boundaries.Foster a security-first engineering culture: Advocate for security-centric thinking within engineering teams without hindering progress. Lead incident responses decisively, ensuring that January emerges stronger from security events through thorough post-incident analyses.Streamline compliance with minimal overhead: Maintain SOC 2, PCI-DSS, and financial compliance using automated systems and build infrastructure that generates audit evidence seamlessly, eliminating compliance bottlenecks.

Join Ramp as a Cloud Security Engineer and be part of a dynamic team dedicated to safeguarding our cloud infrastructure. In this role, you will leverage your expertise to design, implement, and maintain robust security measures that protect our clients' data and ensure compliance with industry standards.

Why Join UsAt Brex, we are transforming the way businesses manage their expenses through our innovative AI-powered spend platform. By integrating corporate cards, banking, and global payments with user-friendly software for travel and expenses, we empower companies—from startups to large enterprises like DoorDash, Flexport, and Compass—to control their spending proactively, reduce costs, and enhance efficiency on a global scale.Joining Brex means you will push boundaries, challenge conventional thinking, and collaborate with some of the brightest minds in the industry. We are dedicated to fostering a diverse team and inclusive culture, believing that your potential is only limited by your ambition. We provide you with the tools, resources, and support necessary to elevate your career.Engineering at BrexOur engineering approach at Brex focuses on building scalable systems with intention and speed. Our teams, which encompass Software, Data, Security, and IT, operate with a high degree of autonomy and foster deep collaboration. We take on complex technical challenges, take ownership of our results, and strive for excellence across all stages—from architecture to deployment. At Brex, engineering is a craft, and our builders evolve into leaders.Your RoleAs a Senior Security Operations Engineer at Brex, your mission will be to prevent, detect, and respond to security threats across our corporate and cloud environments. You will leverage existing systems and develop new tools to enhance our security capabilities. Our team is responsible for various functions in corporate security, detection & response, and infrastructure security domains, employing systems engineering and automation to support these functions.Security Operations is nested within our broader Trust & IT organization, providing opportunities to collaborate closely with Application Security, Corporate Engineering, Governance, Risk & Compliance (GRC), and IT. You will work to enhance security configurations, promote positive employee behaviors, and prevent incidents from escalating. Furthermore, you will contribute to our open-source project Substation and have the chance to share insights on the Brex Tech Blog. You will be part of a team that actively engages with the broader security community, committed to mentorship and engineering excellence.We seek individuals with a robust background and a keen interest in detecting, responding to, and resolving security incidents and challenges. You should be passionate about security and eager to contribute to a forward-thinking team.

About the RoleJoin our dynamic team at FanDuel as we seek a skilled Senior Enterprise Security Engineer. This pivotal role requires a professional who is dedicated to crafting and implementing enterprise security control strategies, while also shaping our security posture. You will play a key role in balancing risk reduction with user experience and operational enablement at scale.Reporting directly to the Senior Manager of Enterprise Security Engineering, you will tackle diverse security challenges and lead initiatives that foster a secure environment for our operations.Your ResponsibilitiesImplement cutting-edge models such as “secure by default” and “zero trust” to maintain a robust security posture.Act as a security subject matter expert, collaborating with internal teams to meet business objectives and overcome security challenges.Develop and manage team roadmaps while staying informed of the latest threats and identifying security risks independently.Utilize automation and development approaches to enhance enterprise-wide security controls.Employ AI technologies to amplify the effectiveness of Security Engineering and FanDuel's operations.Support the security organization as needed, fostering a collaborative team environment.What We’re Looking ForProven expertise in security engineering across multiple domains, including Zero Trust, Endpoint Security, Data Protection, and more.Intermediate proficiency in scripting languages such as Python, Go, or Ruby; experience with Python and PowerShell is a plus.Familiarity with identity access management frameworks and protocols like SAML, SCIM, OAuth, and WebAuthN.Ability to model threats to corporate infrastructure and implement preventative architectures and controls.Strong communication skills to work effectively with a diverse range of partners, from engineering to legal teams.Adeptness in navigating rapidly evolving environments with a focus on solving ambiguous challenges.

About UsAt Justworks, we foster a friendly and inclusive workplace culture where our employees are valued and supported. We offer comprehensive benefits, wellness programs, team retreats, and opportunities to connect with industry leaders in the startup ecosystem. Our commitment is to empower businesses by allowing them to focus on their core operations while we tackle their HR challenges. We are driven by data and constant innovation. If you are eager to contribute to a dynamic, entrepreneurial environment and are passionate about creating meaningful solutions while enjoying the journey, we invite you to join us.Our team is united by shared objectives and motivations, which are reflected in our core values as a company.Discover Our ValuesIf this resonates with you, we would love to have you on board.Your RoleWe are seeking a dedicated and experienced Senior Security Engineer with a specialization in AI to spearhead the execution of our AI strategy and advance the objectives of our Digital Security team. The ideal candidate will possess extensive expertise in developing and enhancing security protocols for AI systems, effectively defending against unique AI-related threats. You should have a strong background in assessing the security of software systems featuring AI capabilities, and designing protective measures to safeguard our data from AI-specific vulnerabilities. A foundational understanding of programming and development, particularly with languages such as Ruby on Rails and JavaScript, is essential. Experience in a Unix-like environment and proficiency with standard cybersecurity tools are also preferred.

About GeminiFounded in 2014 by Cameron and Tyler Winklevoss, Gemini is a prominent global crypto and Web3 platform that offers a diverse range of secure, reliable, and user-friendly crypto products and services. Serving individuals and institutions in over 70 countries, our mission is to usher in a new era of financial, creative, and personal liberty by granting trusted access to the decentralized future. We envision a world where cryptocurrency transforms the global financial landscape, the internet, and money itself, fostering greater choice, independence, and opportunity for everyone. As a publicly traded entity, Gemini is uniquely positioned to amplify this vision with greater scale and influence.The Application Security DepartmentAt Gemini, we operate at the critical juncture of financial services and innovative technology, where security failures can severely impact customer trust and regulatory compliance. Our Application Security (AppSec) team is dedicated to ensuring that security is integrated from the very beginning of product development. We aim to secure our products during the conceptual and building phases—right from the requirements documentation to architectural decisions and code implementation. We believe that the most valuable security contributions occur before the product is finalized, as addressing issues afterward can be prohibitively expensive.Role Overview: Senior Application Security EngineerAs a Senior Application Security Engineer on our AppSec team, you will serve as a valued partner to engineering, product, and business teams throughout Gemini. Your role will involve guiding these teams in the design and development of secure products while fostering a culture of security awareness and judgment. Given Gemini's AI-first approach, the AppSec team is responsible for building tools that secure this innovative vision.This position requires in-person attendance at our New York City office twice a week.

About UsAt Justworks, we foster a friendly and inclusive environment where exceptional benefits, wellness programs, company retreats, and opportunities to connect with industry leaders abound. Our commitment to our greatest asset—our people—is paramount.We empower businesses to thrive by handling their HR challenges, allowing them to concentrate on what they do best. Our data-driven approach fuels our continuous improvement. If you seek a supportive and entrepreneurial atmosphere where you can contribute to meaningful projects while enjoying your work, we want to hear from you!At Justworks, we are united by common goals and values, which are reflected in our products and our team dynamics.Discover Our ValuesIf this resonates with you, you will thrive here.Your RoleJustworks is in search of a skilled and proactive Senior Security Engineer to enhance our Security Architecture & Engineering initiatives. We need a versatile professional with expertise in various security domains, including but not limited to cloud security, application security, identity and access management (IAM), and data protection. This role will involve close collaboration with our Security Operations and Governance, Risk, and Compliance (GRC) teams.The ideal candidate will have a strong track record of developing security solutions that bolster organizational security and managing our overall security posture. As this is a hands-on technical position, proficiency in coding languages such as Ruby on Rails, Go, or JavaScript is essential. Experience in a Linux environment and familiarity with common cybersecurity tools are also preferred.

K Health Careers seeks a Senior Application Security Engineer based in New York, NY. The focus of this role is to strengthen application security and protect user data and privacy across the organization. Key responsibilities Identify and analyze software vulnerabilities, then recommend practical solutions. Collaborate with developers and cross-functional teams to integrate security into every phase of the software development lifecycle. Conduct thorough security assessments and review both application code and system architecture. Advise teams on secure coding practices and support their adoption throughout the company. Lead projects focused on enhancing application security protocols and maintaining high standards. Collaboration and impact This position works closely with engineering and other stakeholders to embed security thinking into daily development. Sharing expertise, guiding teams, and shaping a strong security culture are central to the role.

Join Datadog as a Senior Offensive Security Engineer, where you will play a crucial role in enhancing our security posture and protecting our clients. You will work on advanced security projects, conduct vulnerability assessments, and strengthen our defenses against cyber threats.

Join our dynamic team as a Senior Security Engineer specializing in Enterprise SaaS solutions. In this pivotal role, you will leverage your expertise to enhance the security posture of our software offerings, ensuring robust protection against emerging threats. Collaborate with cross-functional teams to implement security best practices and drive initiatives that safeguard our clients' data.

The Security Incident Response Team (SIRT) is integral to safeguarding Datadog from cybersecurity threats. In this pivotal role, you will collaborate with diverse teams to identify, triage, and swiftly respond to an array of security threats, ensuring that incidents are contained promptly. Your contributions will also extend to enhancing our tools and systems, fostering cross-functional learning from incidents to bolster our overall security posture.At Datadog, we value a vibrant office culture that nurtures relationships, collaboration, and creativity. We support a hybrid workplace model, allowing our team members to achieve a harmonious work-life balance.