Senior Network Security Engineer

Dfinsolutions; United States; On-site; USD 140,000 - 180,000; Full time

Job summary

Donnelley Financial Solutions (DFIN) is seeking a Senior Network Security Engineer to provide advanced engineering leadership across cloud and on‑prem environments. You will drive secure, scalable network security platforms, mentor engineers, and partner with stakeholders to align with Zero Trust goals.

You will design secure architectures, own major initiatives, and advance telemetry and automation to reduce risk and improve resilience.

Qualifications

• Bachelor’s degree in CS, IT, or related field or equivalent experience.
• 7–10+ years of hands-on experience in network security engineering, including cloud networking and enterprise platforms.

Responsibilities

• Lead secure LAN/WAN architecture designs for hybrid environments.
• Own medium-to-large security initiatives (segmentation, SASE, firewall modernization).
• Lead incident response and post-incident reviews, driving systemic fixes.

Skills

Network security

Zero Trust

Incident response

Cloud networking

Automation scripting

CI/CD

Mentorship

Education

Bachelor’s degree in CS/IT or related field

Tools

Azure

Zscaler

SIEM

CI/CD tools

Job description

Select how often (in days) to receive an alert:

Join a dynamic team at the pulse of global markets, where we deliver innovative software and service solutions for essential financial reporting and capital markets transactions. At DFIN, we are a values-driven organization that empowers you to build a fulfilling career while bringing your authentic self to work every day.Our “Win as One” mentality ensures that our team’s success is directly linked to Client, Shareholder and Employee Satisfaction.

In 2026, DFIN was named #1 on the 2026 Top 100 Global Most Loved Workplaces® by Best Practice Institute. We have also been recognized as one of America’s Most Loved Workplaces® for five consecutive years and a Built In Best Place to Work for six years, reflecting our continued commitment to supporting employees’ total well-being. Enjoy competitive compensation, a flexible workplace, comprehensive benefits, and opportunities for professional growth. Bring your passion and talents to DFIN – because being YOU thrives here.

Summary:

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.

Responsibilities:

• Lead the design of secure architectures for LAN/WAN, hybrid cloud, and SaaS environments; define reference patterns.
• Own medium-to-large initiatives (e.g., segmentation, SASE expansions, firewall modernization) from design through delivery.
• Contribute to multi-year roadmaps by identifying gaps, reducing technical debt, and aligning to Zero Trust outcomes.

Advanced Network Security Engineering

• Engineer and optimize advanced firewall/WAF capabilities, DDoS protections, API security patterns, and load balancing controls.
• Design Azure connectivity and security controls at scale (hub/spoke, shared services, private connectivity, routing strategy).
• Implement and operationalize microsegmentation strategies and integrate with identity and endpoint signals.
• Lead integrations with telemetry and NDR tools to improve detection fidelity and end-to-end visibility.

Operational Excellence & Incident Leadership

• Act as Level 3 escalation for high-severity incidents; coordinate technical response and ensure timely mitigation.
• Lead root‑cause analysis, author post‑incident reports, and drive systemic fixes and resilience improvements.
• Establish and improve runbooks, operational metrics, and reliability practices for owned platforms; guide on‑call readiness.

Additional Responsibilities

DevSecOps & Automation (Technical Lead)

• Define automation standards for network/security workflows; build reusable modules and guardrails for safe changes.
• Partner with platform engineering to embed secure connectivity controls into CI/CD and infrastructure‑as‑code pipelines.

Mentorship & Cross‑Functional Leadership

• Mentor engineers in architecture, troubleshooting, and secure design; provide technical reviews and guidance.
• Influence stakeholders by presenting options, risks, and recommendations; partner with vendors to resolve complex issues.
• Enterprise firewalls (on‑prem and cloud), WAF, DDoS protection, API security, and load balancing
• Microsegmentation/segmentation design and enforcement; Zero Trust access patterns (ZTNA)
• SASE/SSE and SD‑WAN architectures; identity‑integrated access and policy strategies
• Azure network architecture at scale (hub/spoke, routing, private endpoints, shared services, resiliency patterns)
• Telemetry, logging, SIEM integrations, and NDR tool integrations to improve detection and response
• Advanced automation/scripting (Python/PowerShell), CI/CD, and infrastructure‑as‑code practices

Qualifications:

Education & Experience

• Bachelor’s degree in Computer Science, IT, or related field (preferred) or equivalent experience.
• 7–10+ years of hands‑on experience in network security engineering, including cloud networking and enterprise platforms.

Certifications (Preferred/Highly Desired)

• CCNP/CCIE (Security or Enterprise) or equivalent experience.
• Cloud networking/security certifications (Azure preferred; AWS/GCP a plus).
• SASE/SD‑WAN certifications (e.g., Zscaler) are a plus.

Technical Skills

• Deep expertise in firewall/WAF policy architecture, routing, segmentation, and cloud networking controls.
• Proven ability to lead complex troubleshooting and incident response for high‑impact events.
• Strong understanding of Zero Trust, defense‑in‑depth, and secure‑by‑design principles.
• Experience designing operationally sustainable solutions (documentation, runbooks, lifecycle management, monitoring).

Soft Skills

• Ability to communicate complex architecture and risk decisions to both technical and business stakeholders.
• Demonstrated leadership through mentorship, technical reviews, and influence across teams.
• High ownership, judgment, and ability to prioritize under pressure.

It is the policy of Donnelley Financial Solutions to select, place, and manage all its employees without discrimination based on race, color, national origin, gender, age, religion, actual or perceived disability, veteran status, actual or perceived sexual orientation, genetic information or any other protected status.

If you are a qualified individual w ith a disability or a disabled veteran, you have the right to request a reasonable accommodation if you are unable or limited in your ability to use or access jobs.dfinsolutions.com as a result of your disability. You can request a reasonable accommodation by sending an email to [e-mail] .

At DFIN, protecting your identity is a top priority. Please be aware of scammers impersonating DFIN recruiters. DFIN recruiters will never request personal information via email or text. You will only receive a text from us if you've already been in contact. All automated messages will come from [e-mail] . If you ever have doubts about the legitimacy of any communication from us, please do not hesitate to reach out for verification via [e-mail] (this email is for general TA questions and is not used for updates on your application status).#BI-Remote