Senior Network Security Engineer

San Francisco, CA

About this position


Twitter is currently seeking a Network Security Engineer who is highly proficient and has had hands-on experience with high-density datacenter networking topologies, configuration, security, troubleshooting, and traffic management.  Twitter's Infrastructure Operations group manages a fast-paced and constantly growing network that seeks to implement cutting-edge technology to power the systems behind one of the world's largest websites and social media platforms.  This position would focus on network security and the solutions that support this infrastructure



  • Implement, and maintain network security policy, standards, and procedures.
  • Deploy and maintain access-list and firewall policies for high throughput environments.
  • Define network security best practice policies for both corporate and production environments.
  • Design and implement Firewall, VPN, NAC, Radius/AAA and IDS/IPS solutions for data center environments.
  • Build and support a network log aggregation infrastructure and support incident response initiatives.
  • Design and develop tools for detection of malicious network activity.
  • Deploy and Maintain DoS mitigation controls and infrastructure
  • Actively participate in the configuration and management of a high density network security equipment.
  • Provide 24/7 on-call security operational support on a rotational basis.
  • Interact with internal and external technical leaders to develop innovative solutions that meet business needs with adherence to architectural goals and principles
  • Ability to articulate advanced technical topics



  •  M.S. Computer Science or equivalent experience.
  • Experience securing large-scale web applications.
  • Strong understanding of TCP/IP stack and troubleshooting tools (tcpdump/protocol analysis), Routing/Switching, BGP, NetFlow
  • Run periodic network vulnerability scans and security reviews.
  • Participate in compliance audits from a network perspective.
  • Support the incident responses with network data and solutions.
  • Effectively follow change management guidelines for all the changes made to the production systems.


Desired Skills

  • Automation and scripting skills for configuration management and monitoring.
  • Hands-on network engineering and operations on-call experience.
  • Advanced knowledge of ISP networking including security and redundancy.
  • Experience with JUNOS, Arbor Peakflow, AWS Security controls
  • Experience with regulatory compliance audits such as ISO 27001/2, PCI DSS, SOX
  • Experience developing and debugging in Python, Perl or C.
  • Ability to write project plans, lead cross functional project teams and lead problem-solving activities


We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status. 

Hiring Process

Step 1

After you apply, a recruiter may reach out to you for an introductory call.

Step 2

If your background is a match for the role, you may phone interview with 1-2 people.

Step 3

If you continue through the process, you will come onsite 1-2 times to interview with a total of 5-10 people.


Personal Information

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U.S. Equal Opportunity Employment Information  (Completion is Voluntary)

At Twitter, we have a bold aspiration to reach every person on the planet. We believe that goal is more attainable with a team that understands and represents different cultures and backgrounds and we are committed to an inclusive and diverse Twitter.

This is where you come in! Please take a few minutes to provide us with your information. You are not required to provide this information and you may decline to disclose. Your decision to provide information (or not) will not affect your employment or opportunities at Twitter.

Twitter is an equal opportunity employer. We do not discriminate based on race, color, ethnicity, ancestry, national origin, religion, sex, gender, gender identity, gender expression, sexual orientation, age, disability, veteran status, genetic information, marital status or any legally protected status.

You can view the ‘EEO is the Law’ poster here.

Twitter does not accept any unsolicited resumes from recruiting agencies and will not pay fees associated with any such resumes. Agencies, please do not send resumes to any Twitter location, employee, or email address.

Twitter, Inc. is committed to working with and providing access and reasonable accommodations to applicants with physical or mental disabilities. If you need an accommodation in order to apply for open job opportunities, please submit a description of your accommodation request to This email is only for accommodation requests related to the application process.

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