Senior Software Engineer - Server Security

About the PositionJoin our dynamic Network Security team as a Network Engineer, where you'll play a pivotal role in managing, scaling, and enhancing our network security infrastructure through hands-on operations, innovative design, and strategic implementation. We seek a candidate with robust networking fundamentals and practical experience with security appliances including firewalls and proxies.At Jane Street, our extensive array of distributed systems is built on a resilient, agile, multi-vendor network infrastructure that accommodates diverse traffic profiles, from trading operations to internet connectivity. Supporting such a comprehensive multi-functional network necessitates advanced monitoring and automation tools.Strong interpersonal and communication skills are essential as you collaborate with colleagues around the globe. Your responsibilities will include identifying and resolving network issues, planning and executing deployments, and optimizing systems. Your advanced networking skills and security expertise will also enable you to:Work collaboratively with our Network Engineering team on designing and deploying security perimeters and adjacent network infrastructure.Manage and continuously refine network segmentation, DMZ, and other critical elements of network security.Evaluate and conduct laboratory testing of new platforms for our network security infrastructure.Partner with our Cybersecurity team to detect and mitigate threats and vulnerabilities within our network.Engage with application owners and traders to facilitate secure business workflows.Enhance support by improving network infrastructure observability and scripting, while communicating requirements to our software engineers.Contribute to the improvement of our network security processes and documentation.A holistic approach to system design is vital for success in this role. Our broader Networking team values flexibility, compatibility, and efficiency in crafting solutions, while actively seeking ongoing feedback and buy-in from users across the firm. We foster a culture of intellectual humility, openness, and continuous improvement, which directly influences our team's daily operations. We are all partners striving towards shared goals, always on the lookout for innovative ideas that can strengthen our work.Your exceptional communication abilities and analytical thinking will be indispensable as we support our colleagues in their daily functions and ensure our systems operate at peak performance.

COMPANY OVERVIEWKKR & Co. Inc. is a distinguished global investment firm specializing in alternative asset management along with innovative capital markets and insurance solutions. Our mission is to generate attractive returns on investments through a disciplined approach, employing top-tier talent, and fostering growth within our portfolio companies and communities.TEAM OVERVIEWThe Technology organization at KKR is a collective of passionate technologists and product managers committed to delivering exceptional products and solutions that create significant value for our stakeholders, clients, and investors. Our dedication to technology and innovation drives our commitment to crafting high-quality solutions that meet the complex needs of our evolving business landscape.We prioritize teamwork and collaboration, cultivating a culture that values diverse perspectives and collective success. Our global presence encourages the integration of varied ideas in product delivery, allowing us to design comprehensive and scalable solutions that maximize impact while remaining agile to the changing needs of our business.POSITION OVERVIEWWe are on the lookout for a skilled Network Security Engineer to join our information security team in New York or Boston. This role requires full-time, on-site presence five days a week.The ideal candidate will possess over six years of experience in developing and building security solutions with expertise spanning network, email, endpoint, data, identity, and cloud security. Familiarity with financial systems, cloud services (AWS/Azure), or AI security will be highly regarded.RESPONSIBILITIESNetwork Security:Design, implement, and manage network security solutions, including firewalls, VPNs, intrusion detection/prevention systems (IDS/IPS), and network access control (NAC).Analyze network traffic for potential security threats and vulnerabilities.Develop and enforce network security policies, procedures, and standards.

About FluidstackFluidstack is at the forefront of developing cutting-edge infrastructure designed for the next era of intelligence. Our collaborations with premier AI laboratories, government entities, and industry leaders—including Mistral, Poolside, Black Forest Labs, and Meta—enable us to deliver computational power at unprecedented speeds.We are driven by a sense of urgency to bring Artificial General Intelligence (AGI) to fruition. Our passionate team is dedicated to creating world-class infrastructure, treating our clients' success as our own. If you have a strong sense of purpose, a relentless pursuit of excellence, and are eager to contribute to the acceleration of intelligence, we invite you to be part of our journey in shaping the future.About the RoleWe are seeking a highly experienced Senior / Staff Network Security Engineer to lead our security strategy and protect our rapidly expanding cloud platform. In this role, you will design and implement robust security measures focused on the network perimeter, ensuring that our services are secure, resilient, and dependable on a large scale. You will operate in a high-throughput environment, safeguarding our infrastructure while fostering trust throughout the organization. The ideal candidate will possess over 5 years of in-depth knowledge of contemporary cloud and network architectures and be passionate about nurturing a security-first culture through mentorship and leadership.Key ResponsibilitiesPerimeter & Edge Security Design: Develop and implement robust protections at the network edge, including perimeter firewalls, proxy layers, Web Application Firewalls (WAFs), and CDN-based controls to secure Fluidstack’s global presence. Every ingress point and service should be fortified against unauthorized access and potential threats.DDoS Resilience: Establish and manage sophisticated DDoS defense strategies that guarantee service uptime. Continuously assess traffic patterns, refine defenses such as rate limiting and traffic filtering, and respond swiftly to volumetric spikes or unusual activities.Zero-Trust Implementation: Spearhead the adoption of a Zero-Trust framework across Fluidstack’s cloud and network environments. Design solutions that enforce least privilege access, continuous verification, and service micro-segmentation, thereby eliminating implicit trust at every level.Monitoring & Incident Response: Establish a comprehensive network security monitoring system to detect threats early. Identify indicators of compromise, seek out vulnerabilities, and coordinate rapid incident response efforts to minimize impact.Cross-Department Collaboration: Work closely with Networking, Infrastructure, Site Reliability Engineering (SRE)/DevOps, and Software Engineering teams to integrate security best practices into design and operational workflows.

We are seeking a skilled Cisco Network Engineer with a robust understanding of network security and hands-on experience with Cisco, Check Point, and F5 devices. The ideal candidate will be proficient in vendor support and possess a well-rounded knowledge of network infrastructure.Key Responsibilities:Manage and troubleshoot Cisco and Arista switches, including STP, Ether channels, switchports, and syslogs.Analyze and monitor health statistics of network components.Troubleshoot Cisco routers including Routing, Syslogs, ACLs, and HSRP.Set up and troubleshoot VPN configurations on Cisco ASA, including monitoring VPN stats and logs.Oversee policy and image management, NAT configurations, and logging.Utilize Cisco and SourceFire IPS to monitor real-time logs and troubleshoot connection issues.Implement F5 BIGIP LTM load balancing methods and perform basic troubleshooting.Work with Check Point to manage blades, policy, NATing, and logging.Tools and Software:SolarWinds IP MonitorKIWI SysloggerCatoolsSolarWinds NPM and NetFlowCacti

About Honest Networks At Honest Networks, we are committed to providing high-speed, affordable internet service to empower communities, enabling education, creativity, and enjoyment. As a fast-growing, venture-backed internet service provider based in Manhattan, we pride ourselves on delivering gigabit internet at transparent prices, complemented by outstanding customer support. We believe our success stems from our dedicated team members who exhibit integrity, a strong work ethic, and a zeal for continuous learning. If you thrive in a dynamic, mission-oriented environment, we invite you to apply and become a part of our team. Discover more at www.honest.net. About the Role We are seeking a skilled Network Engineer to join our expanding team. This full-time position requires availability from 8 AM to 4 PM, Tuesday through Saturday. Primary Responsibilities Swiftly addressing incoming technical support inquiries and challenges. Engaging directly with current and potential customers via phone, text, web chat, and email. Conducting advanced troubleshooting of Wi-Fi and other WAN/LAN networking concerns. Providing direct assistance to the lead engineer. This position is not remote and requires presence in New Jersey, New York, Connecticut, or Philadelphia.

Join our dynamic team at Collabera Inc. as a Network Engineer. In this role, you will be responsible for designing, implementing, and maintaining network solutions that ensure high availability and security. You will collaborate with cross-functional teams to deliver robust network services that support our business objectives.

Role Overview The Metropolitan Opera Association seeks a Network Security Administrator to help protect and support the organization’s network infrastructure at Lincoln Center in New York, NY. This position focuses on maintaining the security and reliability of digital assets and systems. Key Responsibilities Monitor network activity and security alerts Manage and update security protocols to reduce risk Identify and address vulnerabilities in network systems Support the ongoing operation and protection of digital assets Location This role is based onsite at Lincoln Center, New York, NY.

Network EngineerEmployment Type: Full Time, Experienced LevelDepartment: Information TechnologyCGS Federal is actively searching for a skilled Network Engineer to be a pivotal part of a dynamic team dedicated to the assessment, enhancement, and maintenance of a comprehensive large-scale network initiative. This project encompasses both wired and wireless network infrastructure along with related hardware and software solutions. The primary goal of this project is to evaluate the existing fragmented networks and to design and implement a cohesive network architecture that meets the stringent requirements for wireless and wired connectivity, as well as software integration. This role involves consulting on the necessary hardware and software to support this extensive infrastructure, alongside conducting systems testing, vulnerability assessments, and quality assurance to ensure a seamless implementation of the new setup. The Network Engineer will collaborate closely with state and local government representatives, internal stakeholders, subject matter experts, and vendors providing development services.At CGS Federal, we unite motivated, highly talented, and innovative individuals to tackle the most pressing challenges faced by government agencies using cutting-edge technology. Our mission is fueled by candidates who are eager to drive governmental innovation, value collaboration, and proactively address the needs of their colleagues. We pride ourselves on fostering a supportive work environment that encourages professional growth through numerous learning opportunities.

Join our dynamic team at 360IT Professionals as a Senior Network Engineer, where you will play a critical role in designing, implementing, and maintaining our network infrastructure. You will collaborate with cross-functional teams to ensure optimal network performance and security, while also mentoring junior engineers and driving projects to completion.

Role overview The City of New York is hiring a Network Engineer to support and enhance its network infrastructure. This position plays a key role in maintaining dependable connectivity for various city departments. Responsibilities Design network solutions tailored to the requirements of city agencies Implement and configure network hardware and systems Oversee daily network operations to maintain secure and stable connections Location This position is located in New York City.

Join the dynamic team at Wehrtyou, where we push the boundaries of High-Performance Computing (HPC) Network Engineering. Our dedicated team designs and implements cutting-edge low-latency communication infrastructures that form the backbone of our extensive GPU and CPU compute clusters. Our mission is to architect, optimize, and scale a high-performance LAN and WAN infrastructure that interconnects our globally distributed, large-scale on-prem data centers. This enables rapid growth and peak operational performance to support our demanding computational workloads.We seek an experienced Network Engineer with a strong background in designing, deploying, and scaling networks within large-scale HPC environments. You'll be instrumental in building the next generation of infrastructure for a top-tier algorithmic trading firm that stands at the forefront of technology and finance.This position demands not only deep technical expertise but also the leadership and vision necessary to shape the future of cloud-scale networking. You will have extensive responsibilities and the autonomy to analyze and solve complex problems, with your solutions making an immediate impact on our global operations. We are looking for an individual who is passionate about technology and eager to confront significant challenges. You will engage in various projects aimed at enhancing network performance and capacity while contributing to both the management and technical intricacies of our computing architecture. Our talent and computing capabilities are our key differentiators, and we are committed to investing in both.

Join our dynamic team at Integrated Resources Inc. as a Network Engineer / Architect. In this essential role, you will design, implement, and maintain complex network systems that enhance connectivity and operational efficiency. You will collaborate with cross-functional teams to ensure optimal network performance, security, and scalability.As a Network Engineer / Architect, your expertise will be critical in addressing network issues and driving innovative solutions to meet the evolving needs of our organization.

We are seeking a highly skilled Data Center Network Engineer to join our dynamic team in Bethpage, NY. In this role, you will be responsible for designing, implementing, and managing network solutions within our data centers. Your expertise will be pivotal in ensuring the reliability, performance, and security of our network infrastructure.As a Data Center Network Engineer, you will collaborate with cross-functional teams to align network strategies with organizational goals, troubleshoot complex network issues, and optimize existing systems for enhanced efficiency. This is an excellent opportunity for a motivated professional looking to advance their career in a fast-paced environment.

Join our dynamic team at Wehrtyou as a Senior WAN Network Engineer, where you will play a pivotal role in designing, implementing, and managing wide area networks (WAN). Your expertise will ensure optimal network performance and security across our global operations.

Join our dynamic team as a Cisco Network Engineer Consultant, where you will play a pivotal role in designing, implementing, and managing Cisco network solutions. You will collaborate with various stakeholders to ensure optimal network performance and security. This position is ideal for professionals passionate about networking technologies and eager to take their careers to the next level.

Join NBCUniversal as a Senior Network Engineer, where you will play a pivotal role in designing, implementing, and maintaining our extensive network infrastructure. You will collaborate with cross-functional teams to ensure seamless connectivity and security across all platforms.

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.

Role Overview Claylabs is hiring a Security Engineer in New York to help protect our digital infrastructure. This role focuses on finding vulnerabilities, putting security measures in place, and maintaining the integrity of our systems. What You Will Do Identify security vulnerabilities across systems and networks Implement technical safeguards to protect company assets Monitor and support the ongoing integrity of digital infrastructure Location This position is based in New York.

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.