Senior Software Engineer - Platform Security

The Trade Desk is a global technology company and the world’s leading independent platform for digital advertising. Our technology helps advertisers reach the right audiences across the open internet, from streaming TV and podcasts to mobile apps, news, and more. About the Team The Platform Security team builds foundational systems that enable secure, reliable operation of The Trade Desk at scale. We focus on making security resilient, developer‑friendly, and deeply integrated into the platform. Authentication and authorization for users and services Workload identity (SPIFFE / SPIRE‑based) Secrets and certificate management Security health monitoring and risk mitigation Golden images, just‑in‑time access, and secure shared libraries We partner with teams across the company to deliver tools, libraries, and frameworks that run across Kubernetes, cloud environments (Azure, AWS, Aliyun), and on‑prem infrastructure, supporting a global fleet of 15,000+ machines. About the Role As a Lead / Senior Software Engineer on Platform Security, you will serve as a technical leader and end‑to‑end owner for security‑critical systems operating at massive scale. You will lead the design and evolution of core security platforms, drive complex initiatives across teams, and raise the bar for how security is built and operated across The Trade Desk. You will manage a small team of engineers, providing technical direction, mentorship, and ownership. What You’ll Do Lead the design, implementation, and long‑term evolution of large‑scale security services, from architecture through production operations Own complex, cross‑cutting initiatives spanning authentication, authorization, identity, and secure access Make and influence architectural decisions that balance security, reliability, scalability, and developer experience Drive high‑quality engineering practices, including testing, observability, operational readiness, and incident response Build and maintain shared libraries and frameworks that standardize authentication, authorization, and security best practices across the company Partner closely with engineers, SREs, and stakeholders across teams to deliver secure‑by‑default platforms Mentor and guide other engineers through code reviews, design discussions, and technical leadership Participate in on‑call rotations and lead incident response for security‑critical systems Help shape future‑looking initiatives, including AI‑driven systems that reason about security posture, model architecture, and surface risk automatically Operate comfortably in ambiguity and drive outcomes that impact the broader platform Who you are 7+ years of experience in a high‑scale environment that values infrastructure as code Previous lead experience is desired Significant professional experience building and operating production systems using an object‑oriented language such as C#, Java, C++, or similar Proven experience designing and delivering distributed systems at scale Strong experience deploying and operating services using infrastructure‑as‑code and automated deployment pipelines Deep understanding of system reliability, observability, and operational excellence Experience leading technical design and influencing architecture across teams Strong communication and collaboration skills, with a track record of mentoring other engineers Bachelor’s or Master’s level degree in computer science or a related engineering field, or equivalent experience Nice to Have Qualifications Experience designing or operating identity and access management (IAM) systems Familiarity with Kubernetes, cloud platforms, or hybrid infrastructure at scale Background in security engineering or site reliability engineering Interest in applying automation or AI to improve security posture and resilience Compensation and Benefits The base salary range for this role is $124,900—$228,900 USD. Employees may be eligible to become shareholders through stock‑based compensation grants. The Trade Desk offers a comprehensive benefits package, including medical, dental, and vision coverage with premiums paid in full for employees and dependents; 401(k) plan with company match; short‑term and long‑term disability coverage; basic life insurance; well‑being benefits; tuition reimbursement; parental leave; sick time of 1 hour per 30 hours worked; vacation time of up to 120 hours in the first year and 160 hours thereafter; and approximately 13 paid holidays per year. Employees can also purchase stock at a discount through the Employee Stock Purchase Plan. Equal Employment Opportunity Statement The Trade Desk does not accept unsolicited resumes from search firm recruiters. Fees will not be paid in the event a candidate submitted by a recruiter without an agreement in place is hired; such resumes will be deemed the sole property of The Trade Desk. The Trade Desk is an equal opportunity employer. All aspects of employment will be based on merit, competence, performance, and business needs. We do not discriminate on the basis of race, color, religion, marital status, age, national origin, ancestry, physical or mental disability, medical condition, pregnancy, genetic information, gender, sexual orientation, gender identity or expression, veteran status, or any other status protected under federal, state, or local law. Contact Please reach out to View email address on click.appcast.io to request an accommodation or discuss any accessibility needs you may require to access our Company Website or navigate any part of the hiring process. When you contact us, please include your preferred contact details and specify the nature of your accommodation request or questions. Any information you share will be handled confidentially and will not impact our hiring decisions. #J-18808-Ljbffr The Trade Desk, Inc.