Senior Network Security Engineer

<p class="p1"><strong>Donnelley Financial Solutions (DFIN)</strong> is the leading provider of innovative, software and technology&ndash;enabled financial regulatory and compliance solutions. Supporting every stage of our clients&rsquo; business and investment lifecycle, DFIN provides regulatory filing and transactional deal solutions to public and private companies, mutual funds, and other regulated investment firms.</p>

US

DFIN

<p>Donnelley Financial Solutions (DFIN) is the leading provider of innovative, software and technology-enabled financial regulatory and compliance solutions.</p> <p>We provide regulatory filing and deal solutions to public and private companies, mutual funds, and other regulated investment firms. We support every stage of our clients&rsquo; business and investment lifecycles.</p> <p>After 33 years as the financial division of RR Donnelley &amp; Sons, DFIN became a standalone public company on October 1, 2016.</p> https://www.dfinsolutions.com/

keywords: position summary,architecture, design & roadmap leadership,advanced network security engineering,operational excellence & incident leadership,devsecops & automation (technical lead),mentorship & cross-functional leadership,technology & domain exposure,education,experience,certification,knowledge,skills

Full Time

Overview: <br />The Senior Network Security Engineer provides advanced engineering expertise and technical leadership for enterprise network security across cloud and on-prem environments. This role leads complex designs and implementations, serves as a senior escalation point for major incidents, and drives modernization initiatives aligned to DFIN’s Zero Trust strategy. The senior engineer mentors other engineers, shapes standards, and partners with stakeholders to deliver secure, scalable, and resilient network security platforms. <br />
Responsibilities: <br />Architecture, Design & Roadmap Leadership<br /> <ul> <li>Lead the design of secure architectures for LAN/WAN, hybrid cloud, and SaaS environments; define reference patterns.</li> <li>Own medium-to-large initiatives (e.g., segmentation, SASE expansions, firewall modernization) from design through delivery.</li> <li>Contribute to multi-year roadmaps by identifying gaps, reducing technical debt, and aligning to Zero Trust outcomes.</li> </ul> <br />Advanced Network Security Engineering<br /> <ul> <li>Engineer and optimize advanced firewall/WAF capabilities, DDoS protections, API security patterns, and load balancing controls.</li> <li>Design Azure connectivity and security controls at scale (hub/spoke, shared services, private connectivity, routing strategy).</li> <li>Implement and operationalize microsegmentation strategies and integrate with identity and endpoint signals.</li> <li>Lead integrations with telemetry and NDR tools to improve detection fidelity and end-to-end visibility.</li> </ul> <br />Operational Excellence & Incident Leadership<br /> <ul> <li>Act as Level 3 escalation for high-severity incidents; coordinate technical response and ensure timely mitigation.</li> <li>Lead root-cause analysis, author post-incident reports, and drive systemic fixes and resilience improvements.</li> <li>Establish and improve runbooks, operational metrics, and reliability practices for owned platforms; guide on-call readiness.</li> </ul>Additional Responsibilities <br />DevSecOps & Automation (Technical Lead)<br /> <ul> <li>Define automation standards for network/security workflows; build reusable modules and guardrails for safe changes.</li> <li>Partner with platform engineering to embed secure connectivity controls into CI/CD and infrastructure-as-code pipelines.</li> </ul> <br />Mentorship & Cross-Functional Leadership<br /> <ul> <li>Mentor engineers in architecture, troubleshooting, and secure design; provide technical reviews and guidance.</li> <li>Influence stakeholders by presenting options, risks, and recommendations; partner with vendors to resolve complex issues.</li> </ul>Technology & Domain Exposure <ul> <li>Enterprise firewalls (on-prem and cloud), WAF, DDoS protection, API security, and load balancing</li> <li>Microsegmentation/segmentation design and enforcement; Zero Trust access patterns (ZTNA)</li> <li>SASE/SSE and SD-WAN architectures; identity-integrated access and policy strategies</li> <li>Azure network architecture at scale (hub/spoke, routing, private endpoints, shared services, resiliency patterns)</li> <li>Telemetry, logging, SIEM integrations, and NDR tool integrations to improve detection and response</li> <li>Advanced automation/scripting (Python/PowerShell), CI/CD, and infrastructure-as-code practices</li> </ul>
Requirements: <br />Education &amp; Experience<br /> <ul> <li>Bachelor&rsquo;s degree in Computer Science, IT, or related field (preferred) or equivalent experience.</li> <li>7&ndash;10+ years of hands-on experience in network security engineering, including cloud networking and enterprise platforms.</li> </ul> <br />Certifications (Preferred/Highly Desired)<br /> <ul> <li>CCNP/CCIE (Security or Enterprise) or equivalent experience.</li> <li>Cloud networking/security certifications (Azure preferred; AWS/GCP a plus).</li> <li>SASE/SD-WAN certifications (e.g., Zscaler) are a plus.</li> </ul> <br />Technical Skills<br /> <ul> <li>Deep expertise in firewall/WAF policy architecture, routing, segmentation, and cloud networking controls.</li> <li>Proven ability to lead complex troubleshooting and incident response for high-impact events.</li> <li>Strong understanding of Zero Trust, defense-in-depth, and secure-by-design principles.</li> <li>Experience designing operationally sustainable solutions (documentation, runbooks, lifecycle management, monitoring).</li> </ul> <br />Soft Skills<br /> <ul> <li>Ability to communicate complex architecture and risk decisions to both technical and business stakeholders.</li> <li>Demonstrated leadership through mentorship, technical reviews, and influence across teams.</li> <li>High ownership, judgment, and ability to prioritize under pressure.</li> </ul>