This is a full time, remote Summer Internship that can be based anywhere in the United States or Canada.
The Network Intelligence team at Calix is seeking a Software Engineer Intern to help expand our coverage of Layer 7 application signatures, device typing patterns, protocol classification logic, and threat intelligence detection capabilities. As part of the team that powers Calix’s data-driven insights, you will help build the foundational intelligence used across Calix platforms to identify applications, devices, and network behaviors. This role is ideal for a motivated third or fourth‑year student who wants to apply networking knowledge and analytical skills in a real-world broadband cybersecurity and intelligence environment. You will gain hands-on experience analyzing traffic, developing classification logic, and contributing to the industry’s leading broadband experience platform.

In this role, you will be part of a unique and award-winning internship program within the company. The program provides the opportunity to learn new skills through training and on the job learning. The duration of the program is expected to be 90 days.

Responsibilities and Duties:

• Analyze network traffic data and PCAPs to derive patterns, signatures, and classification rules for Layer 7 protocols and applications.
• Develop and enhance intelligence logic used for application identification, device typing, and threat detection.
• Implement classification tests, unit tests, and verification logic to ensure accuracy and coverage of new signatures.
• Use tools such as Wireshark to inspect flows, validate assumptions, and document protocol behaviors.
• Collaborate with senior engineers to refine detection methods, evaluate edge cases, and address gaps in existing intelligence libraries.
• Participate in peer reviews, technical discussions, and requirements clarifications as part of the engineering lifecycle.
• Contribute to internal documentation, including signature specifications, detection logic descriptions, and testing notes.
• Assist in identifying improvements to automation workflows, data analysis processes, or tooling.

Qualifications:

• Currently enrolled in an undergraduate college degree program in Computer Science, Computer Engineering, Software Engineering, or a related field. Preference will be given to students who have at least completed their junior or senior years and who have previous internship or work experience.
• Strong understanding of networking fundamentals, including OSI model, TCP/IP, Layer 7 protocols, and common application architectures.
• Experience with at least one programming language used for analysis or tooling.
• Knowledge of Linux environments.
• Able to work for the complete summer break (May
• August or June
• September).

Preferred Qualifications:

• Experience with protocol reverse-engineering or traffic pattern analysis.
• Familiarity with network security concepts or threat detection fundamentals.
• Exposure to automation frameworks or scripting for data analysis.

The base pay range for this position varies based on the geographic location. More information about the pay range specific to candidate location and other factors will be shared during the recruitment process. Individual pay is determined based on location of residence and multiple factors, including job-related knowledge, skills and experience.

San Francisco Bay Area:

27.60 - 34.50 USD Hourly

All Other US Locations:

24.00 - 30.00 USD Hourly

For information on our benefits click here.