Responsibilities

The Senior Application Security Engineer is a senior individual contributor responsible for strengthening Apollo’s secure software development lifecycle and reducing application risk across product, platform, and AI-powered features.
This role blends deep code-level application security work with strong cross-functional partnership. It includes application security reviews, threat modeling, AppSec tooling, findings triage and remediation follow-through, external testing intake, and developer enablement.
This role is calibrated at the L6 senior-IC level: owning semi-annual or annual goals, solving ambiguous problems with sound judgment, improving operational processes, and driving meaningful cross-team collaboration and influence.
Secure SDLC, design review, and threat modeling
Own and continuously improve the secure software development lifecycle for Apollo applications so security is embedded into design, implementation, and deployment.
Perform application security reviews, threat modeling, and deep code-level analysis for high-impact product, platform, and AI features before launch.
Provide practical security architecture guidance to Engineering, Product, and IT teams
Help define and maintain application-security guardrails, secure design expectations, code review standards, and risk models for new and existing systems.
Vulnerability management and hands-on remediation
Drive execution-heavy vulnerability management across internal reviews, bug bounty, pentests, SCA/runtime findings, and other research signals, ensuring findings are validated, prioritized, routed clearly, and tracked through remediation and verification within SLAs.
Go beyond identifying issues: read the code, explain root cause, propose the safest fix, and directly implement or support remediation when needed for complex vulnerabilities.
Perform hands-on validation and offensive security testing of applications and fixes, including exploit development, bypass testing, adversarial thinking, and focused red-team-style exercises, to confirm remediations address the underlying issue rather than only the initial symptom.

Qualification

Strong Linux and cloud fundamentalsExperience using AI-assisted toolsStrong written and verbal communicationExperience with security trainingExample Success Outcomes

Required

5+ years of software engineering or application security experience, with meaningful hands-on AppSec depth in modern SaaS environments.
Strong software development skills and the ability to read, write, and ship production code; Ruby experience is highly valuable, and Python or similar scripting ability is a plus.
Strong Linux and cloud fundamentals, ideally with experience in GCP-backed environments.
Deep familiarity with common AppSec issues, secure design, secure authentication and authorization patterns, vulnerability management, and developer security tooling.
Demonstrated ability to perform deep code review, penetration testing, and exploit-oriented validation, and to either fix vulnerabilities directly or work closely with engineers to land durable remediations that hold up against bypass attempts and variant analysis.
Experience handling findings from bug bounty, pentests, internal reviews, or automated security tooling through closure and verification.
Experience using AI-assisted tools, automations, APIs, or structured workflows to improve engineering or security processes at scale.
Experience securing AI-powered systems or features, including AI API exposure, prompt and response handling, data protection, misuse scenarios, and monitoring expectations.
Strong written and verbal communication, stakeholder management, and influencing skills across technical and non-technical partners.

Preferred

Experience supporting or leading security reviews for AI-native products, internal agents, or AI-assisted engineering workflows.
Experience improving secure-by-design practices and AppSec observability in a fast-moving engineering organization
Experience with security training, developer enablement, or security champions programs
Relevant security certifications are a plus
Example Success Outcomes
Improve the health and flow of AppSec findings by keeping prioritization, remediation, and verification moving within defined SLAs.
Complete recurring application reviews or threat models for important systems and features
Increase engineering adoption of secure patterns, AppSec tooling, and security training

Senior Application Security Engineer at Apollo.io · LumiJobs

Senior Application Security Engineer

Responsibilities

Qualification

Required

Preferred

Benefits

Company

Apollo.io

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