Sr Principal Software Engineer, AI Security Platform

About Northern Trust As a global leader in innovative wealth management, asset servicing, asset management and banking services, Northern Trust (Nasdaq: NTRS) is proud to guide the world’s most successful individuals, families, corporations and institutions. Since 1889, we have aligned our efforts with our three guiding Principles That Endure: Service, Expertise, and Integrity. Together, they reflect the three cornerstones of business conduct which we strive to instill in our employees, whom we call partners, and to provide to our clients and the communities we serve worldwide. With more than 135 years of financial experience and over 24,000 partners, we serve the world’s most sophisticated clients using leading technology and exceptional service. We are seeking a highly experienced Senior Principal Software Engineer to support technical development of our AI-powered Code Security Scanner platform. This platform leverages frontier AI models and advanced security automation to identify, validate, and report software vulnerabilities across enterprise codebases. This role will be responsible for ongoing development, architectural evolution, and long-term enhancement of the platform. The successful candidate must be equally comfortable designing user-facing applications, building automation, integrating AI services, and securing cloud-native solutions. Platform Ownership Serve as a lead technical developer for the AI Code Scanner platform. Implement modernization, enhancements, and scalability initiatives Mentor junior team members Front-End Development Improve user experience, reporting dashboards, workflow management, and administrative capabilities Implement secure authentication and authorization patterns Backend & AI Engineering Maintain and extend orchestration and scanning services. Expand and manage integrations with LLM-based security analysis capabilities Enhance automated vulnerability analysis, reporting, and verification workflows Experience 15+ years of professional software engineering experience 5+ years in a lead, principal, or senior engineering role Experience supporting enterprise-scale applications in regulated environments Technical Skills Expert-level React development Modern SPA architecture REST APIs and authentication integrations Expert-level Python development API design and integration Automation and orchestration frameworks Test automation and quality engineering Expert-level Python development API design and integration Automation and orchestration frameworks Test automation and quality engineering Experience integrating Large Language Models (LLMs) Agent-based workflows and automation frameworks Application security and vulnerability management Salary Range: $164,600 - 288,000 USD Salary range is a good faith estimate of base pay. Northern Trust provides a comprehensive benefits package including retirement benefits (401k and pension), health and welfare benefits (medical, dental, vision, spending accounts and disability), paid time off, parental and caregiver leave, life & accident insurance, and other voluntary and well-being benefits. Northern Trust also provides a discretionary bonus program that may include an equity component. Work Authorization Applicants must be authorized to work in the U.S. without the need for employment-based visa sponsorship now or in the future. Northern Trust will not sponsor applicants for U.S. work visa status for this opportunity (no sponsorship is available for H-1B, L-1, TN, O-1, E-3, H-1B1, F-1, J-1, OPT, CPT or any other employment-based visa). Working with Us As a Northern Trust partner, you will be part of a flexible and collaborative work culture, which has a strong history of financial strength and stability. Movement within the organization is encouraged, senior leaders are accessible, and you can take pride in working for a company committed to an inclusive workplace and assisting the communities we serve. Philanthropy is deeply rooted in