Senior Application Security Engineer

Role Description

The Senior Application Security Engineer II 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.

• Application security reviews, threat modeling, AppSec tooling, findings triage and remediation follow-through, external testing intake, and developer enablement.
• 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.

Qualifications

• 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.

Requirements

• Own and continuously improve the secure software development lifecycle for Apollo applications.
• Perform application security reviews, threat modeling, and deep code-level analysis for high-impact product, platform, and AI features before launch.
• Drive execution-heavy vulnerability management across internal reviews, bug bounty, pentests, SCA/runtime findings, and other research signals.
• 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.
• Apply clear, risk-based severity decisions using exploitability, data sensitivity, customer impact, and blast radius.
• Configure and improve AppSec tooling and integrations.
• Support and scale security enablement for engineers and security champions.
• Produce clear documentation, metrics, and written narratives that improve AppSec visibility, observability, and decision-making.

Benefits

• Equity; company bonus or sales commissions/bonuses.
• 401(k) plan.
• At least 10 paid holidays per year, flex PTO, and parental leave.
• Employee assistance program and wellbeing benefits.
• Global travel coverage.
• Life/AD&D/STD/LTD insurance.
• FSA/HSA and medical, dental, and vision benefits.

Company Description

Apollo.io is the leading go-to-market solution for revenue teams, trusted by over 500,000 companies and millions of users globally. Founded in 2015, the company is one of the fastest growing companies in SaaS, raising approximately $250 million to date and valued at $1.6 billion.