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About the Role

We are seeking a Sr. Full Stack Application Security Engineer with deep expertise in mobile application security to join our Product Security team. This hands-on, impact-driven role involves working directly with mobile, backend, and platform engineering teams to identify, prevent, and remediate security issues across iOS, Android, API, and backend systems. You will operate close to the code and product, reviewing architectures, influencing secure design, and helping teams ship features safely without slowing delivery. This role requires understanding how modern distributed systems and mobile apps are built, deployed, and attacked. While mobile application security is a core focus, you will contribute to the security posture across the full application stack, including APIs, backend services, identity and authentication flows, and CI/CD pipelines.

Responsibilities

Build and improve security capabilities, automation, and guardrails for mobile applications and backend/API services
Perform application or API/backend penetration testing
Identify, triage, and help remediate vulnerabilities across Chime products
Partner closely with engineering and product teams to embed security into the development lifecycle across mobile apps, APIs, and backend services
Perform architecture and code reviews across the stack (iOS/Android, APIs, backend) with a focus on secure data storage, authentication, authorization, secure communication, and session/token handling
Leverage AI to accelerate security workflows (e.g., code review support, triage, threat modeling), and partner with teams building AI-enabled features to define and implement production-grade AI security controls

Requirements

5+ years of experience in application security, with strong hands-on experience across both mobile and backend systems
Hands on experience securing iOS and Android applications in production environments
Strong understanding of mobile threat models and common attack techniques
Experience with mobile security testing techniques, including static and dynamic analysis
Familiarity with iOS and Android platform security features and limitations
Practical coding experience, preferably in Ruby, Go, Python languages
Ability to clearly communicate security risks, tradeoffs, and remediation guidance to engineering partners

Skills

Mobile application security
iOS security
Android security
API security
Backend security
Application security
Penetration testing
Vulnerability management
Secure design
Secure coding
Architecture review
Code review
AI security controls
Ruby
Go
Python

Location

Hybrid

Work Type

Full-time
Hybrid

Experience Level

Senior

Salary/Compensations

$213,000 - $295,000

Benefits

Bonus
Competitive equity package
Backup child, elder, and pet care
Subsidized commuter benefits
Comprehensive health, financial, and wellbeing benefits
Generous vacation policy
Company-wide paid days off
1% of your time off to support local community organizations
Annual wellness stipend
Up to 22 weeks of paid parental leave for birthing parents
12 weeks of paid parental leave for non-birthing parents
Access to family planning reimbursement

About the Company

At Chime, we believe that everyone can achieve financial progress. We created Chime—a financial technology company, not a bank*—on the premise that core banking services should be helpful, easy, and free. Through our user-friendly tools and intuitive platforms, we empower our members to take control of their finances and work towards their goals. Whether it's starting a savings account, purchasing a first car or home, launching a business, or pursuing higher education, we're proud to have helped millions unlock their financial potential.
We're a team of problem solvers, dreamers, and builders with one shared obsession: our members. From day one, Chimers have worked tirelessly to out-hustle and out-execute competitors to bring our mission to life. Their grit and determination inspire us to work harder every day to deliver the very best experience possible. We each bring an owner's mindset to our work, refusing to be outdone and holding ourselves accountable to meet and exceed the highest bars for our teams, our company, and our members.
We believe in being bold, dreaming big, and taking risks, while also working together, embracing our diverse perspectives, and giving each other honest feedback. Our culture remains deeply entrepreneurial, encouraging every Chimer to see themselves as stewards of our mission to help everyday Americans unlock their financial progress.
We know that to achieve our mission, we must earn and keep people's trust—so we hold ourselves to the highest standards of integrity in everything we do. These aren't just words on a wall—our values are embedded in every aspect of our business, serving as a north star that guides us as we work to help millions achieve their financial potential.
Because if we don't—who will?
*Chime is a financial technology company, not a bank. Banking services provided by The Bancorp Bank, N.A. or Stride Bank, N.A., Members FDIC.

Equal Opportunity

Chime is proud to be an Equal Opportunity Employer. We consider qualified applicants without regard to race, color, ancestry, religion, sex, national origin, sexual orientation, gender identity, age, marital or family status, disability, genetic information, veteran status, or any other legally protected basis under provincial, federal, state, and local laws, regulations, or ordinances. We will also consider qualified applicants with criminal histories in a manner consistent with the requirements of state and local laws, including the San Francisco Fair Chance Ordinance, Cook County Ordinance, NYC Fair Chance Act, and the LA City Fair Chance Ordinance, and consistent with Canadian provincial and federal laws. If you have a disability or special need that requires accommodation during any stage of the application process, please contact: accommodations@chime.com.