Senior Application Security Engineer

About the Company Gemini is a global crypto and Web3 platform founded by Cameron and Tyler Winklevoss in 2014, offering a wide range of simple, reliable, and secure crypto products and services to individuals and institutions in over 70 countries. Our mission is to unlock the next era of financial, creative, and personal freedom by providing trusted access to the decentralized future. We envision a world where crypto reshapes the global financial system, internet, and money to create greater choice, independence, and opportunity for all — bridging traditional finance with the emerging cryptoeconomy in a way that is more open, fair, and secure. As a publicly traded company, Gemini is poised to accelerate this vision with greater scale, reach, and impact. The Department: Application Security The Role: Senior Application Security Engineer As a member of the Application Security (AppSec) team, you will share in the responsibility of protecting the company and our customers against application security threats. The AppSec team is focused on the advancement of modern application security practices and supports the engineering organization by finding, fixing, and preventing software security vulnerabilities. As a Senior Application Security Engineer on the Application Security team, you will work closely with engineering and product teams to provide security recommendations and identify security issues throughout the software development lifecycle. This includes secure design reviews, threat modeling, secure code review, and penetration testing among other activities. In addition to providing hands‑on security guidance and reviews, you will design, build, and maintain application security tooling and integrations that scale security across the organization. This role is required to be in person twice a week at either our San Francisco, CA or New York City, NY office. Responsibilities Support the Gemini Secure Software Development Lifecycle as an application security subject matter expert through design review, threat modeling, code review, and penetration testing. Collaborate and advise engineering teams on application security best practices and vulnerability remediation. Perform deep‑dive security reviews to ensure all Gemini products and services follow secure design principles across our product portfolio (web, mobile, and APIs). Research, build and drive adoption of high‑signal application security automation and secure‑by‑default frameworks. Create and deliver hands‑on software security training to engineering teams to enable engineers at scale. Participate in the Application Security on‑call rotation to support engineering teams during incidents. Minimum Qualifications 5+ years of experience in application security or similar roles. Ability to perform design reviews, threat modeling, secure code reviews, or penetration testing with an attacker mindset. Strong background in application security best practices and familiarity with common vulnerabilities (e.g. SSRF, race conditions, privilege escalations, etc.). Some background in development or scripting experience (Python, Scala, C++, or JavaScript). Familiarity with and ability to understand business objectives, business context, and security risk. Strong communication skills and the ability to collaborate on a cross‑functional team. Preferred Qualifications Experience with microservice architectures. Experience with cloud‑native environments. Experience with preventing application security vulnerabilities through secure design patterns, automated tooling, or frameworks. Experience with supply chain security. It Pays to Work Here The compensation & benefits package for this role includes: Competitive starting salary A discretionary annual bonus Long‑term incentive in the form of a new hire equity grant Comprehensive health plans 401K with company matching Paid Parental Leave Flexible time off Salary Range The base salary range for this role is between $140,000 - $200,000 in the State of New York, the State of California and the State of Washington. This range is not inclusive of our discretionary bonus or equity package. When determining a candidate’s compensation, we consider a number of factors including skillset, experience, job scope, and current market data. In the United States, we offer a hybrid work approach at our hub offices, balancing the benefits of in‑person collaboration with the flexibility of remote work. Expectations may vary by location and role, so candidates are encouraged to connect with their recruiter to learn more about the specific policy for the role. Employees who do not live near one of our hubs are part of our remote workforce. Equal Employment Opportunity At Gemini, we strive to build diverse teams that reflect the people we want to empower through our products, and we are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, or Veteran status. Equal Opportunity is the Law, and Gemini is proud to be an equal opportunity workplace. If you have a specific need that requires accommodation, please let a member of the People Team know. #J-18808-Ljbffr