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Sr Lead Software Engineer, AI Security Platform

Northern Trust · Chicago, IL · $114,500–$194,700 a year · Full time

Posted Sep 22, 2026 · We last checked this listing on Oct 6, 2026

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Likely interview questions for this role

Written from this job description, not a generic list. Each one notes what the interviewer is really checking.

About your past

Tell me about a time you led technical direction on a platform with several teams contributing. How did you keep it coherent?

What they are checking: Senior leadership through standards, reviews and influence rather than doing all the work personally.

Describe a time you had to push back on a deadline because shipping would have created a security or quality problem.

What they are checking: Judgment and courage to protect quality while still offering a path forward to stakeholders.

What would you do

A scan of a large codebase is timing out in Azure Functions. How do you approach the problem?

What they are checking: Debugging and architecture judgment around serverless limits and when to move work elsewhere.

Developers complain the scanner's findings are hard to act on. What would you change?

What they are checking: Focus on adoption and developer experience, since an unused security tool reduces no risk.

About the work

How would you design a Python orchestration framework that runs many security scans in parallel inside containers?

What they are checking: Practical system design covering job queuing, isolation, retries and resource limits for a scanning platform.

The AI scanner reports a vulnerability that turns out to be a false positive. How would you build validation to cut those down?

What they are checking: Whether they understand that trust in an AI security tool depends on validating findings before developers see them.

How would you use Azure AI Foundry in this platform, and what would you watch for around cost and latency?

What they are checking: Hands-on familiarity with hosted model services and the operational trade-offs of calling them at scale.

How do you protect the scanner itself, given it reads sensitive source code and talks to an AI model?

What they are checking: Security thinking about the platform's own attack surface, including data exposure and prompt injection from scanned code.

How would you structure the React dashboard so security teams and developers each get what they need from the results?

What they are checking: Product sense in front-end design for different audiences, not just component knowledge.

How would you evaluate whether a new model version makes the scanner better or worse before rolling it out?

What they are checking: Whether they think in test sets and measurable evaluation, which is essential for AI-driven tools.

How would you design the Azure SQL data model for findings so you can track a vulnerability across repeat scans?

What they are checking: Data modeling skill for deduplication and history, which makes results useful over time.

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The full job description

As published by Northern Trust.

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 Lead 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 • 12+ 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: $114,500 - 194,700 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 Northern Trust’s history and is an essential element of our culture. Employees around the world give their time and talent to work for the greater good of their communities. Reasonable Accommodation Northern Trust is committed to working with and providing adjustments to individuals with health conditions and disabilities. If you need a reasonable accommodation for any part of the employment process, please email our HR Service Center at MyHRHelp@ntrs.com , or alternatively you can discuss your individual requirements with the recruiter you are working with.

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