Application Security Engineer (X Money)

SpaceXAI•Washington, DC

8d•$100,000 - $258,000

About The Position

SpaceXAI’s mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our team is small, highly motivated, and focused on engineering excellence. This organization is for individuals who appreciate challenging themselves and thrive on curiosity. We operate with a flat organizational structure. All employees are expected to be hands-on and to contribute directly to the company’s mission. Leadership is given to those who show initiative and consistently deliver excellence. Work ethic and strong prioritization skills are important. All employees are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates. We are seeking a skilled and innovative Application Security Engineer to join 𝕏 Money. In this role, you will protect the security and integrity of our payments and financial products throughout the software development lifecycle, with a particular focus on code security, CI/CD pipelines, and systems that move and hold customer funds. Experience securing fintech, payments, digital wallet, ledger, or similar high-value platforms, where fraud, abuse, and unauthorized transfers are a constant concern, is strongly preferred.

Requirements

Bachelor's degree in Computer Science, Cybersecurity, or a related field
3-5 years of experience in application security, with a strong focus on code security practices
Experience in payments, money transmission, digital wallets, or related financial platforms
Deep understanding of secure coding practices, application security frameworks, and common vulnerabilities (e.g., OWASP Top 10)
Proficiency in Python or Rust and experience with secure coding practices in these languages
Experience securing CI/CD pipelines and implementing DevSecOps practices
Familiarity with software supply chain security and SBOM generation tools
Experience with security testing tools (e.g., Burp Suite, OWASP ZAP) and static/dynamic code analysis
Experience securing payments, wallets, ledgers, or other high-value transaction systems, including controls against fraud, abuse, and integrity issues
Experience designing and implementing agentic and LLM-based solutions for security problems
Excellent communication skills, able to explain complex security issues to both technical and non-technical audiences

Nice To Haves

Hands-on experience securing applications on AWS; familiarity with other cloud platforms is a plus
Relevant security certifications (e.g., BSCP, OSCP, OSWE)
Experience managing bug bounty programs
Background in data privacy and compliance relevant to financial products and cloud-native applications
Experience with GitOps and infrastructure-as-code security
Experience building custom security tooling to enhance and automate security processes
Contributions to open-source security projects or tools

Responsibilities

Conduct in-depth code reviews and static analysis to identify and mitigate security vulnerabilities in financial applications
Design and implement secure coding guidelines and best practices for development teams
Collaborate closely with development teams to integrate security practices throughout the CI/CD pipeline
Perform threat modeling and risk assessments for payments, wallets, ledgers, and related product surfaces, and develop mitigation strategies for fraud, abuse, and unauthorized movement of funds or credits
Manage vulnerability tracking and remediation efforts, providing guidance to development teams
Manage the bug bounty program, including intake, triage, researcher communication, and coordinated disclosure
Support incident response activities related to application security
Stay current on emerging threats against financial and cloud-native systems, and continuously strengthen our controls
Evaluate and secure software supply chains, including producing and maintaining Software Bills of Materials (SBOMs)
Design and implement agentic and LLM-based solutions that help detect, investigate, or prevent security problems