Senior Application Security Engineer

About CharterUP. CharterUP is transforming the $450 billion group transportation and mobility market with an AI native platform that powers modern charter shuttle and emerging autonomous vehicle operations. Trusted by many Fortune 500 companies CharterUP connects enterprises institutions and event organizers to thousands of bus operators nationwide while increasingly serving as the operating system for large scale shuttle and transit programs across airports campuses industrial sites and major events.

Through real time availability transparent pricing intelligent routing and AI driven dispatch and optimization CharterUP replaces a fragmented and opaque industry with automation accountability and scale.

Why Join Us

• Innovative Impact: Be part of the team thats revolutionizing group travel setting new standards in an industry overdue for change.
• Growth Opportunities: As a hyper growth company and one of the fastest-growing companies recognized by Inc. theres no better time to join our dynamic growth-stage organization.
• Driven Team: Collaborate with some of the most driven minds in tech all while working in a remote-first environment with a tech hub in Austin TX.
• Funding and Stability: Our $60 million Series A funding was just the startwere poised for even greater expansion and you can be part of this exciting journey. CharterUp has achieved this growth profitability and efficiently ensuring long-term stability.

About the Role

CharterUP is seeking a Senior Application Security Engineer to raise the bar on how we build and ship secure software. This is a dedicated security role on the Platform Engineering team. Our applications handle customer PII passenger manifests trip and location data and payment flows and they enforce authorization boundaries between thousands of parties in a two-sided marketplace. Youll be the technical leader on application security here setting our standards defining what secure enough to ship means owning security decisions in design and code review and driving vulnerabilities through remediation. Expect to split your time roughly evenly between building security tooling and automation and conducting threat modeling design reviews and targeted code reviews.

Title: Senior Application Security Engineer

Reports to: Engineering Manager

Location: Austin TX (Hybrid: Monday Wednesday Friday in-office)

What Youll Do

• Own security tooling and vulnerability management across SAST dependency and container scanning secret detection and penetration testing including triage routing and remediation SLAs
• Lead security design reviews threat modeling and targeted manual code reviews for high-risk systems including authentication authorization payments and customer data
• Identify and prevent multi-tenant authorization vulnerabilities across quoting booking and trip workflows through scalable patterns and automated testing
• Strengthen AWS security through IAM and account boundary design secrets management workload protection and comprehensive logging
• Scale security across engineering by building secure defaults reusable libraries automation and developer guardrails and establishing a security champions practice

What Youll Bring

• 5 years of experience in software engineering or security including 3 years in application or product security
• Strong software engineering skills in Java and/or TypeScript with experience building production-grade security tooling automation libraries and developer-facing solutions
• Deep expertise in application security including threat modeling secure system design authentication authorization access control injection SSRF and manual code review; familiarity with security and compliance standards including SOC 2 PCI DSS and GDPR is a plus.
• Hands-on experience with AWS and cloud-native security including IAM multi-account architecture containerized workloads CI/CD security and vulnerability management
• Strong technical judgment and influence with the ability to set security standards prioritize risk and drive remediation across engineering teams without direct authority

Recruiting Process

• Step 1 - Video call: Talent Acquisition interview
• Step 2 - Video call: Technical interview
• Step 3 - Video call: Team interviews
• Step 4 - Offer & reference check
• Welcome aboard!

We believe great people can live anywhereand they deserve great benefits too. While offerings may vary slightly by location we prioritize hiring near our hubs in Austin Atlanta Miami and Denver as we grow our global team.

• Flexible Work Model: CharterUP operates as a remote-first company with select roles requiring regular in-office presence based on team and business needs. Role-specific expectations will be shared during the hiring process. U.S.-based employees may reside in any of our 19 approved states.
• Comprehensive Health & Wellness: Medical dental and vision insurance mental health support virtual care gym discounts and family-building the U.S. we cover 100% of premiums for employees. International benefits align with local standards.
• Time Off to Recharge: Paid time off so you can truly unplug. U.S.: 15 PTO days (increasing to 20 after 2 years) 8 paid holidays. International policies vary by country.
• Financial Peace of Mind: Company-paid life short-term and long-term disability insurance where available.
• Performance-Driven Culture: Join a fast-moving ambitious and collaborative team that wins together.
• Referral Rewards: Earn bonuses for bringing top talent to the team.
• Planning for the Future: Long-term financial planning support. U.S.: 401(k) plan. International: region-specific savings programs where applicable.
• Top-Tier Tech: Choose a Mac or PC plus monitor keyboard and mouse to hit the ground running.

CharterUP is an Equal Opportunity Employer. We are committed to creating an inclusive accessible and respectful workplace. We consider all qualified applicants without regard to race color religion sex sexual orientation gender identity or expression age national origin ancestry disability medical condition marital status veteran status or any other protected characteristic in accordance with applicable federal state and local laws in the United States and Canada. If you require accommodation during the recruitment process please let us know. CharterUP is committed to providing reasonable accommodations during the hiring process. If you need assistance or an accommodation please contact your recruiter.

Hiring Locations: CharterUP U.S.-based candidates and employees must reside in one of the following states: Arizona Colorado Florida Georgia Hawaii Mississippi Missouri North Carolina New Hampshire Nevada New York Oklahoma South Dakota Tennessee Texas Utah Washington and Wyoming.

We hire in the U.S. and Canada and are actively expanding our global footprint.