Senior Network Security Engineer

NorthMark Compute & Cloud; Dallas (TX); On-site; USD 125,000 - 180,000; Full time

Benefits offered by this job

Lunch stipend

Medical benefits

Dental & Vision

Parental leave

Life insurance

Disability insurance

401(k) match

Flexible benefits

Paid time off

Job summary

NorthMark Compute & Cloud is seeking a hands‑on Network Security Engineer to design and maintain security infrastructure for hyperscale HPC and cloud compute environments. This role drives controls, automation, and operational practices to protect infrastructure at scale.

You will contribute to design, development, and delivery of critical security components, balancing security with delivery speed, and collaborating with cross‑functional teams.

Qualifications

• 7+ years of experience in network security engineering across trusted, untrusted, and DMZ environments.
• Strong understanding of network protocols, OSI model, and TCP/UDP applications.
• Experience securing on‑premises and cloud networks (AWS, Azure, GCP).
• Experience with security monitoring tools and SIEM platforms.
• Familiarity with security frameworks and hardening standards (NIST, CIS, ISO 27001).

Responsibilities

• Design, implement, and deliver scalable network security architecture and controls across on‑prem and cloud environments.
• Serve as SME for network security technologies and provide guidance to the team.
• Resolve complex security challenges using sound judgment and prioritization.
• Collaborate with cross‑functional teams to align security with delivery objectives.
• Develop and maintain network security standards, policies, and documentation.
• Support network segmentation and policy enforcement; participate in security reviews.
• Mentor junior security engineers and contribute to team growth.

Skills

Network security engineering

Security architecture

Cloud network security

SIEM and monitoring

NIST/CIS/ISO27001 basics

Communication & leadership

Tools

Firewall automation tools

Job description

The Company

NorthMark Compute & Cloud (NMC²) is backed by dedicated leadership and investment, with a clear mission as it operates at the bleeding edge of technology. Its goal is to scale and enhance the high-performance computing (HPC) and cloud infrastructure that supports its clients’ research, production, and delivery, enabling breakthroughs that shape the industries of tomorrow. Its engineers build critical infrastructure to eliminate friction in scientific research, simulations, analysis, and decision-making, accelerating discovery and driving faster innovation.

The Position

The Network Security Engineer is a hands‑on technical role within NMC²’s centralized Security Engineering organization, responsible for designing and maintaining the network security infrastructure that protects our hyperscale HPC and cloud compute environment. This role plays a direct part in building the controls, automation, and operational practices that keep NMC²’s infrastructure secure at scale.

You would contribute to the design, development, and delivery of critical network security components within complex, enterprise-scale systems and projects.

This role brings strong technical depth in network security architecture and controls, applying sound judgment to resolve complex problems and balance technical integrity with delivery speed.

Working closely with the Manager of Network and Infrastructure Security and cross-functional peers, the Senior Security Engineer drives meaningful improvements to the organization's security posture while serving as a subject matter expert and mentor within the team.

Responsibilities

• Contribute to the design, implementation, and delivery of scalable network security architecture and controls including firewalls, IDS/IPS, and VPNs across on-premises and cloud environments Serve as the team's primary subject matter expert for network security technologies, providing guidance and technical direction on complex security challenges
• Apply technical depth and sound judgment to resolve complex network security challenges, making trade-offs that balance security requirements with operational and delivery needs
• Collaborate effectively with cross-functional peers across infrastructure, cloud, and IT operations, communicating technical decisions and progress with clarity and ensuring alignment across teams
• Develop and maintain network security standards, policies, and technical documentation
• Support network segmentation and micro-segmentation efforts by providing technical expertise on traffic flows, access controls, and policy enforcement
• Participate in security architecture reviews for new projects, systems, and third‑party integrations to ensure network security requirements are addressed
• Mentor junior security engineers and contribute to the overall growth and development of the network security team

Requirements

• 7+ years of experience in network security engineering, with hands‑on experience across trusted, untrusted, and DMZ environments
• Strong understanding of network protocols and the OSI model, with practical experience in TCP/UDP‑based applications, routing, switching, and load balancing
• Experience securing both on-premises and cloud network environments (AWS, Azure, or GCP)
• Experience designing and securing network environments across both on-premises and cloud platforms (AWS, Azure, or GCP)
• Proven ability to identify and deliver process improvements, automation opportunities, and tool enhancements within a security engineering function
• Experience with security monitoring tools and SIEM platforms, with the ability to investigate and respond to network‑based threats
• Strong understanding of security frameworks and hardening standards such as NIST, CIS Benchmarks, or ISO 27001
• Effective communicator with the ability to articulate technical decisions and trade‑offs clearly to both technical peers and leadership

Preferred

• Relevant certifications preferred, such as CCNP Security, PCNSE, CISSP, or equivalent
• Experience with VxLAN EVPN data center architecture
• Background in SOC operations or working with MSSPs
• Firewall automation experience

It is impossible to list every requirement for, or responsibility of, any position. Similarly, we cannot identify all the skills a position may require since job responsibilities and the Company’s needs may change over time. Therefore, the above job description is not comprehensive or exhaustive. The Company reserves the right to adjust, add to or eliminate any aspect of the above description. The Company also retains the right to require all employees to undertake additional or different job responsibilities when necessary to meet business needs.

Must be legally authorized to work in the United States without the need for employer sponsorship, now or at any time in the future.

Benefits & Perks

• Company‑Paid Lunch Stipend: Lunch is provided via GrubHub
• Company‑Paid Benefits: 100% Employer‑Paid Medical in our High Deductible Health Plan, Dental and Vision benefits for employees and their families, 16 weeks of Paid Parental Leave, Employee Assistance Program, Life insurance, Short‑Term Disability and Long‑Term Disability
• 401(k): Company will match 100% of your contributions up to 6%
• Optional Employee‑Paid Benefits: Medical insurance in our PPO plan and a variety of other benefits such as Health Savings Accounts (with Company Contribution!), Flexible Spending Accounts, Supplemental Life Insurance, Wellhub and more.
• Time Off: 25 days of Paid Time Off plus 12 company holidays

EQUAL OPPORTUNITY EMPLOYER

NORTHMARK STRATEGIES LLC IS AN EQUAL EMPLOYMENT OPPORTUNITY EMPLOYER. THE COMPANY'S POLICY IS NOT TO DISCRIMINATE AGAINST ANY APPLICANT OR EMPLOYEE BASED ON RACE, COLOR, RELIGION, NATIONAL ORIGIN, GENDER, AGE, SEXUAL ORIENTATION, GENDER IDENTITY OR EXPRESSION, MARITAL STATUS, MENTAL OR PHYSICAL DISABILITY, AND GENETIC INFORMATION, OR ANY OTHER BASIS PROTECTED BY APPLICABLE LAW. THE FIRM ALSO PROHIBITS HARASSMENT OF APPLICANTS OR EMPLOYEES BASED ON ANY OF THESE PROTECTED CATEGORIES.