Network Security Software Engineer Intern (Security Engineering) - 2027 Fall

The Network Security team builds enterprise-grade network security products and solutions that protect online businesses from cyberattacks and disruption. We're a group of engineers who like challenging the status quo and solving real-world security problems effectively and efficiently. We set ambitious goals, value teamwork, and favor open, direct communication. If that resonates with you, come make an impact with us as an intern and grow alongside a team shipping production security systems at scale.

We are looking for talented individuals to join us for an internship. Our internship program offers students hands-on experience, industry exposure, and opportunities to apply their knowledge to real-world challenges while building a strong foundation for personal and professional growth. Interns will gain practical experience, explore potential career paths, and participate in social events, learning programs, and development workshops alongside industry professionals. Candidates may apply to a maximum of two positions across Our Company and its affiliates globally. Applications will be considered in the order they are submitted. Applications are reviewed on a rolling basis, so we encourage you to apply early. Please clearly state your availability in your resume, including your start and end dates.

Online Assessment Candidates who pass resume screening will be invited to participate in Our Company's technical online assessment.

Responsibilities

• Participate in the design and development of network security products for hyperscale environments, including firewalls, WAF, IDS, and similar systems, under the guidance of senior engineers
• Assist in building security capabilities for AI-native systems, including LLM/Agent abuse prevention, risk detection, and behavioral analysis
• Support the team in delivering customized security solutions for ByteDance's business units that meet compliance and security requirements
• Take ownership of well-scoped modules or features, participate in code reviews, and contribute to team documentation and testingMinimum Qualifications
• Currently pursuing a Undergraduate/ Master's/Phd's in Computer Science, Cybersecurity, Networking or a related discipline.
• Solid foundation in data structures, algorithms, computer networks, and operating systems
• Proficiency in at least one of C, Go, or Python, demonstrated through coursework, personal projects, research, or prior internships
• Exposure to or coursework/project experience with LLM/Agent-based systems (e.g., tool/function calling, context management, or related security implementations)
• Self-driven problem solver with strong communication and collaboration skills, comfortable working in fast-paced, ambiguous environments

Preferred Qualifications

• Personal projects, research, CTF experience, or coursework related to LLM/AI security (e.g., prompt injection defense, abuse prevention, content safety, model risk control)
• Familiarity with firewall, WAF, or IDS products, or networking/security-related open-source contributions
• Prior internship experience in security, networking, or backend infrastructure