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Principal Software Engineer — Application Security & AI Trust Architecture

Cisco Systems San Jose, CA

San Jose, CA

Today

$221k - $380k/yr Full time Ai Security Ai Trust Api Security

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Job Description

Lead software security and AI trust architecture efforts across software platforms and services.

Responsibilities

Define and drive security architecture across software platforms and services.
Translate high-level security strategy into engineering execution to keep products secure from the cloud to the box.
Lead cross-functional initiatives and mentor engineering team members.
Engage with customers and apply AI to improve the development lifecycle and threat prevention capabilities.
Partner with application teams to create secure-by-default software patterns.
Implement strict Model Context Protocol (MCP) access boundaries.
Enforce spec-driven security contracts.
Mitigate vulnerabilities specific to autonomous agent workflows, including prompt injection, indirect data exfiltration, and unauthorized tool invocation.
Design trust boundaries, sandboxing models, and execution guardrails for autonomous application agents and LLM tool-calling workflows.
Architect granular authentication, authorization, and least-privilege scoping for MCP servers, tool registries, and external integrations.
Mitigate emerging AI threat vectors such as OWASP Top 10 for LLMs, indirect prompt injection, tool hijacking, credential harvesting, and context leakage.
Establish spec-driven security standards across application contracts, embedding authentication schemes, data sanitization, and authorization scopes directly into machine-readable specs.
Embed security contracts into OpenAPI, TypeSpec, and gRPC/Protobuf specifications.
Implement automated security contract testing and static/dynamic schema validation to detect authorization bypasses, Broken Object Level Authorization (BOLA), and injection vulnerabilities before deployment.
Lead comprehensive architectural threat modeling for critical application tiers, distributed business logic, and multi-tenant data boundaries.
Create reusable, hardened software design patterns, cryptographic utilities, and session management frameworks for application engineering teams.
Architect and scale automated security gates in CI/CD pipelines, including SAST, DAST, IAST, software composition analysis, container image signing, and SBOM tracking.
Define policy-as-code frameworks to enforce deterministic security baselines across service deployments (e.g., OPA/Rego, Cedar).
Act as the principal technical escalation point for complex application security architecture reviews and critical vulnerability disclosures.
Mentor senior software engineers on defensive coding practices, modern API security standards, and zero-trust application design.

Requirements

Bachelor’s degree in Computer Science, Engineering, or a related technical field.
15+ years of experience in software engineering and application security architecture, including designing, securing, and operating distributed applications.
Experience with application security frameworks such as OWASP Top 10, OWASP API Top 10, CWE/SANS 25, or zero-trust application patterns.
Experience in identity and access governance, including one or more of OAuth 2.0, OIDC, SAML, mTLS, SPIFFE/SPIRE, or fine-grained authorization models (RBAC, ABAC, ReBAC).
Experience in at least one backend language: Python, Go, TypeScript/Node.js, Rust, or Java.
Experience integrating security controls into cloud-native architectures such as Kubernetes, AWS/GCP/Azure, API gateways, or service meshes.

Technologies

Model Context Protocol (MCP), LLM tool-calling workflows
OpenAPI, TypeSpec, gRPC/Protobuf
Open Policy Agent (OPA), Rego, Cedar
OWASP Top 10, OWASP API Top 10, OWASP Top 10 for LLMs
CWE/SANS 25
OAuth 2.0, OIDC, SAML, mTLS, SPIFFE/SPIRE
RBAC, ABAC, ReBAC
Python, Go, TypeScript/Node.js, Rust, Java
Kubernetes, AWS, GCP, Azure, API gateways, service meshes
SAST, DAST, IAST
Software composition analysis, container image signing, SBOM tracking
OPA/Rego, Semgrep, CodeQL, CVE

Preferred Qualifications

Experience with the security implications of MCP or similar AI tool-invocation interfaces.
Experience writing policy-as-code engines (Open Policy Agent, AWS Cedar, Oso/Polar) or custom linter/SAST rules (Semgrep, CodeQL).
Active involvement in application security research, CVE publications, open-source security tooling, or industry working groups (OWASP, CNCF Security, OASIS).
Relevant security certifications, such as CISSP, CSSLP, CCSP, or AWS Certified Security.
Experience evaluating and securing LLM-powered applications, tool-use execution loops, and RAG architectures.

Benefits

Medical, dental and vision insurance
401(k) plan with a Cisco matching contribution
Paid parental leave
Short and long-term disability coverage
Basic life insurance
Grants of Cisco restricted stock units that vest following continued employment with Cisco for defined periods of time
10 paid holidays per full calendar year
1 floating holiday for non-exempt employees
1 paid day off for employee’s birthday
Paid year-end holiday shutdown
4 paid days off for personal wellness determined by Cisco
Non-exempt employees: 16 days of paid vacation time per full calendar year, accrued at 4.92 hours per pay period for full-time employees
Exempt employees: flexible vacation time off program with no defined limit on vacation time use (subject to availability and business limitations)
80 hours of sick time off provided on hire date and each January 1st thereafter, with up to 80 hours of unused sick time carried forward
Additional paid time away may be requested for critical or emergency issues for family members
Optional 10 paid days per full calendar year to volunteer
Non-sales roles may be eligible for annual bonuses based on Cisco’s policies

Location: San Jose, CA (onsite)

Salary: USD 220,900 - 380,000 per yearly

Expected application window closing date: 10/30/2026

Education: Bachelor’s degree in Computer Science, Engineering, or a related technical field

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