Cybersecurity Application Security Engineer

Nelnet is a diversified company providing student loan servicing, professional services, consumer lending, payment processing, renewable energy solutions, and education services. The Application Security Engineer will protect applications, services, and AI-driven components through secure code reviews, penetration testing, security automation, secure SDLC practices, and developer enablement.

Responsibilities:

• Manual Source Code Review
• SAST/DAST scanning
• Expand the Security Champions program
• Develop automated source code review processes
• Work with product teams to ensure secure SDLC processes are in place
• Provide detail vulnerability reports to businesses

Requirements:

• 2–4 years of hands-on application security experience
• Experience integrating security tooling and automated checks into CI/CD pipelines
• Familiarity and experience with OWASP Top 10 and web testing methodologies
• Experience with effectively assessing and communicating risks and appropriate levels of urgency to management and engineering staff
• Experience with technical report writing and communication
• Strong manual code review experience in at least one major language (Java, JavaScript/TypeScript, C#, PHP, etc.)
• Solid threat-modeling expertise (STRIDE, attack trees, misuse cases) for both traditional systems and AI/LLM-integrated features
• Proficiency with SAST, SCA, DAST, web and mobile pentesting, container scanners, secrets-detection tools, and ideally AI-security scanning platforms
• Experience integrating security tooling and automated checks into CI/CD pipeline
• Scripting/automation skills (Python, Bash, Node) for building custom tooling and automating manual processes
• Good understanding of AI/LLM attack surfaces including prompt injection, insecure output handling, model-data leakage, and RAG vulnerabilities
• Strong knowledge of web/API security concepts (session management, secure storage, transport security)
• Excellent organizational, presentation, verbal, and written communication skills
• Ability to effectively assess and communicate risks and appropriate levels of urgency to management and engineering staff
• Aptitude for self-study, setting and achieving long term goals
• Actively seeks to remain technically current and increase expertise and abilities
• Challenges prevailing assumptions when appropriate
• Willing to adapt to changing technology and business landscapes
• Considers change as opportunities to be challenged and grow
• Ability to adapt style of communications to match audience and information sharing needs
• Ability to mentor junior developers/engineers in secure design and coding practices
• To be considered, candidates must already be authorized to work in the United States without the need for current or future sponsorship
• any applicant for this position must complete United States Government security clearance
• The United States Government requires that any applicant for this position must complete United States Government security clearance
• applicants without United States citizenship
• Experience performing secure code reviews or building internal developer tooling
• Previous work with AI or LLM-integrated applications, model security, or prompt safety
• Experience with mobile security, reverse engineering, or platform-specific secure coding
• Certifications such as OSWE, OSCP, GWAPT, GCSA, GCPN, or ML security certs (not required but beneficial)