Senior Security Engineer - Enterprise SaaS

CLEAR builds secure identity solutions used by over 38 million members worldwide. From airports to stadiums and beyond, CLEAR’s technology helps people move through daily life with added safety and convenience. Role Overview The Senior Vulnerability Management Security Engineer joins the Product Security team to strengthen and oversee CLEAR’s vulnerability management program. This role covers cloud, infrastructure, endpoints, and application environments. What You Will Do Manage and improve the vulnerability management program across multiple technical environments Use tools like Wiz, Tenable, and GitHub to identify and assess security risks Translate vulnerability findings into clear, actionable tasks Work closely with engineering teams to address and reduce real-world security risks Location This position is based in New York, New York, United States.

Datadog is on the lookout for a dedicated and skilled Security Engineering Manager to spearhead our Vulnerability Management initiatives within a dynamic multi-provider ecosystem.In this pivotal role, you will oversee the Vulnerability Management Engineering team, which is focused on identifying, assessing, and mitigating vulnerabilities in Datadog's public offerings, including the Datadog Agent and trace libraries. Your leadership will be critical as these products play a vital role in monitoring and ensuring observability in our clients' systems.As the Engineering Manager, you will mentor and develop your team, uphold high standards in vulnerability management practices, and collaborate with product and engineering teams to guarantee the security and integrity of our offerings. You will also be instrumental in defining and executing the security strategy for Datadog’s products.

Datadog is looking for a Security Engineer II to focus on the Vulnerability Lifecycle. This position centers on strengthening the security of Datadog’s systems and infrastructure. Role overview This role involves working closely with a skilled team to identify, assess, and address vulnerabilities. The goal is to maintain secure and resilient systems that protect customer data. What you will do Identify and evaluate vulnerabilities across Datadog’s infrastructure Collaborate with team members to mitigate security risks Develop and refine strategies for proactive vulnerability management Location This position is based in New York, New York, USA.

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 (ISE) team protects CLEAR’s core platforms. This position focuses on cloud security, identity management, and endpoint controls. The work centers on AWS and Kubernetes environments, using infrastructure-as-code to scale and automate security practices. What You Will Do Strengthen security across AWS and Kubernetes infrastructure Develop and implement security controls using infrastructure-as-code Work closely with Engineering, CorpIT, and Security teams to make security a default part of CLEAR’s systems Location This role is based in New York, New York, United States.

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.

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.

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

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

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 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.

CoreWeave is seeking a Security Engineering Manager to lead the Platform Security team. This position is based in Livingston, NJ, New York, NY, Sunnyvale, CA, Bellevue, WA, or San Francisco, CA. The team’s mission is to embed security into CoreWeave’s Kubernetes-based platform and public cloud environments, supporting high-performance infrastructure for AI and machine learning workloads. Role overview This manager will oversee and expand the Platform Security engineering team, reporting to the Senior Director of Security Foundations. The focus is on hands-on leadership and technical execution, with an emphasis on building and implementing security controls rather than policy development. The role requires close collaboration with Infrastructure, Platform Engineering, Site Reliability Engineering, and other security teams to ensure security measures keep pace with business growth and evolving needs. What you will do Lead and grow the Platform Security engineering team. Integrate security into Kubernetes infrastructure and public cloud platforms such as AWS, GCP, and Azure. Define and execute strategies for cloud security posture, workload isolation, platform guardrails, image integrity, and multi-cloud security. Develop and implement security controls across CoreWeave’s infrastructure. Work closely with other technical teams to align platform security with business needs. The Platform Security team The Platform Security team at CoreWeave engineers systems that enforce security at the infrastructure layer. Their work spans both CoreWeave’s own Kubernetes-based platform and third-party public cloud environments. The team supports GPU-accelerated infrastructure for demanding AI and machine learning workloads, ensuring that both customer and internal services remain secure as CoreWeave’s global presence expands.

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.

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.

About the Opportunity At Contentful, we are dedicated to creating a secure and reliable service. Our commitment to security encompasses significant investment in resources and efforts. Our Security team plays a pivotal role in managing information security across the organization and collaborates closely with various internal teams. We believe in embedding security within our DevOps principles, ensuring robust and repeatable processes. We are seeking an enthusiastic and dedicated Manager of Security Engineering, someone who is eager to tackle complex security challenges with innovative and scalable solutions. In this role, you will oversee security engineering initiatives for Contentful's corporate systems, including the tools and platforms that empower our internal security team. Although this position is not responsible for customer-facing product security, you will work in tandem with product security teams within our security organization on overlapping responsibilities. Your role will involve a blend of leadership and hands-on technical execution, focusing on designing, implementing, and managing security controls and tools at scale. Key areas of focus will include identity and access management, data security, and SaaS platforms. You will provide strategic direction and spearhead initiatives while remaining actively involved in their execution. While you may work independently at times, you will frequently collaborate with security leadership, IT, and cross-functional partners to align strategies, implement shared initiatives, and effectively mitigate risks while minimizing impacts on end users across the organization. What to Expect? Develop a high-performing team through coaching, mentorship, goal setting, and performance feedback. Define roles and make hiring decisions to expand the team in alignment with departmental needs. Maintain a hands-on approach, balancing technical leadership with direct implementation work. Own execution and prioritization across projects and operations, utilizing agile delivery practices. Enhance effectiveness and efficiency by refining processes and tools. Champion continuous improvement across all facets of the security program. Communicate risks and technical concepts clearly to leadership and stakeholders. Collaborate with security leadership to execute business-aligned, risk-reduction roadmaps. Shape work scope, sequencing, and success criteria in line with departmental and company objectives. Drive security processes, standards, and best practices across information technology assets.

Join K Health as a Senior Security Engineer specializing in Compliance and Risk. In this pivotal role, you will be responsible for ensuring that our security measures meet regulatory compliance standards while effectively managing risk. You will collaborate with cross-functional teams to implement security protocols that protect our data and systems.

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.

At StubHub, our mission is to revolutionize the live event experience on a global scale. Whether someone is preparing to attend their first concert or their hundredth sporting event, we strive to enhance their journey from ticket discovery to entry at the venue. We extend the same commitment to our sellers, whether they are fans parting with a single ticket or promoters managing a major stadium tour; we aim to make StubHub the most secure and convenient platform for millions of fans worldwide.Join our Product Security Engineering Team as a Senior Product Security Engineer, where you'll play a pivotal role in strengthening our security framework within the end user and services product domain. The ideal candidate will bring extensive experience in CI/CD pipeline security, conducting product and application architecture assessments, implementing contextualized vulnerability management processes, and driving automation initiatives.

The Senior Security Engineer - PKI & Secrets role at CoreWeave sits within the Security Foundations team. This team is responsible for protecting the CoreWeave Cloud, covering everything from data centers and GPU fleets to the platform layers that support customer AI workloads. The PKI & Secrets group manages the cryptographic infrastructure that ensures CoreWeave’s data and systems remain confidential, authentic, and tamper-resistant. Areas of focus include public key infrastructure (PKI), secrets management, hardware security modules (HSMs), key management, and code signing. This position involves close collaboration with teams across the company to deliver cryptographic services that meet high standards for security, reliability, and scalability. What you will do Design, implement, and maintain PKI infrastructure, including certificate authority (CA) hierarchies, issuance policies, certificate lifecycle management, and trust distribution for both Kubernetes clusters and bare-metal hosts. Manage and improve secrets management platforms, focusing on access policies, secret lifecycle governance, and integration using tools such as External Secrets Operator and cert-manager. Operate and scale HSM infrastructure, handling PKCS#11 integration, key ceremony procedures, and high-availability designs to support certificate authorities and signing services. Contribute to the development of key management systems and related security protocols. Locations This position is available in Livingston, NJ; New York, NY; Sunnyvale, CA; Bellevue, WA; and San Francisco, CA.

Principal Vulnerability ResearcherZetier is on the lookout for highly skilled Principal Vulnerability Researchers to assess and neutralize harmful software while crafting vital cyber defense capabilities. Ideal candidates will possess robust hands-on experience in creating, developing, and implementing tools that focus on command and control, persistence, and networking.Key Responsibilities: - Analyze malicious software and devise countermeasures. - Design and develop operational cybersecurity tools.Required Qualifications:Extensive experience in reverse engineering compiled programs (C/C++).Proficient in interpreting common assembly languages (x86, x86-64, ARM).Experience in scripting languages (Python).Familiarity with debuggers and decompilers (gdb, Binja, IDA Pro).Capability to obtain and maintain a U.S. security clearance.Desired Skills:Experience in developing or defeating mitigations (ASLR, DEP, N^X).Proven ability to bypass common anti-reverse engineering techniques (obfuscation).Comprehensive understanding of embedded platforms (FPGA, physical memory).Secure implementation of cryptographic primitives (AES-GCM, SHA256, ECDSA).Experience with program analysis tools and techniques (control flow, program slicing, taint tracing).Effective utilization of automated analysis tools (fuzzers, emulation, sandboxing).In-depth knowledge of file systems and formats (ELF, PE, Mach-O).Strong communication skills with customers and team members.Experience in developing proof-of-concept exploits.Active U.S. security clearance.Zetier is committed to fostering a diverse and inclusive workplace. We are an Equal Opportunity Employer and do not discriminate based on race, religion, color, sex, gender identity, sexual orientation, age, non-disqualifying physical or mental disability, national origin, veteran status, or any other basis protected by law. Employment decisions are based on merit, qualifications, and business needs.