Application Security Engineer

About Engine

Engine is the AI-native platform for intelligent travel. For a decade, Engine has built the proprietary technology and supply behind modern business travel, serving over 40,000 customers and nearly 2 million travelers, along with leading travel and AI companies that build on Engine's infrastructure. One system powers business travel, group travel, human agents, and AI agents.

That work has earned recognition as one of Fast Company's Best Workplaces for Innovators (2025), TravelTech's Reservation Platform of the Year (2026), and one of Built In's Best Places to Work (2020–2026).

We're looking for bold, ambitious people to help redefine how businesses manage and experience travel. Working here, you can expect exponential growth, an ambitious pace, full ownership, and high-caliber colleagues who push you to do the best work of your career. Every hire raises the bar.

Come outpace the ordinary and build the future of travel with us.

Engine is seeking a highly-skilled and motivated Staff Security Engineer to join our team. In this role, you will be a primary owner of the security and integrity of our company's applications and software systems. You will be responsible for building out a vulnerability management pipeline and executing our application security program. You will collaborate closely with engineering teams to ensure that Engine adheres to best practices in application security, tackling complex security repairs and ensuring our "engine" runs fast and securely.

Your Mission:

As part of the Engine team, you’ll play a vital role in an environment where innovation meets collaboration. You will drive work independently, syncing regularly to ensure quality and alignment across the following areas:

• Threat Detection & SIEM Ownership: Own the configuration, tuning, and management of our SIEM solution. You will diagnose unusual threats through sophisticated analysis and develop the alerts needed to respond to security incidents across multiple layers.
• Security Analysis & Reviews: Perform architecture reviews, code reviews, and infrastructure configuration reviews. You will conduct light penetration testing on web and mobile apps, identifying root causes of vulnerabilities and resolving them using creative problem-solving.
• Vulnerability Management: Maintain and optimize a vulnerability management CI/CD pipeline within our container/application delivery infrastructure. You will adapt proven methods to align security goals with business objectives, even when guidance is light.
• Cross-Functional Collaboration: Partner with development and infrastructure teams to enforce secure coding practices and remediation strategies. You will adapt your messaging across teams to reduce misalignment and move security work forward.
• Build and maintain the frameworks and tooling for enterprise security, ensuring that security guidelines are clear and actionable for the broader engineering organization.