This position is listed on behalf of a partner company, which manages all applications and next steps. Our partner is looking for a Principal Security Engineer based in the United States. Join an innovative financial technology organization building secure, scalable infrastructure that expands access to global investment markets. As a Principal Security Engineer, you will provide technical leadership in designing and implementing security capabilities across cloud infrastructure, trading platforms, applications, and corporate systems. You will combine hands-on engineering expertise with architectural vision to protect sensitive data, strengthen security operations, and support demanding regulatory requirements. Working across Engineering, IT, Risk, and Compliance, you will develop automated security controls and resilient platforms that enable business growth without compromising reliability. You will also mentor engineers, influence technical strategy, and lead complex initiatives from initial design through production deployment. This is an opportunity to make a measurable impact in a high-performance fintech environment where security, innovation, and operational excellence are essential.