Senior Software Engineer - Platform Security

Our Software Engineers are end-to-end owners who will participate in all aspects of designing, building, and delivering data-focused products for our stakeholders.

At The Trade Desk we believe that each opportunity to engage with all internal and external stakeholders, is unique. This means y ou will have the opportunity, based on your interests and background, to work on large-scale distributed systems coordinating thousands of servers in cloud and physical data centers around the world, petabyte-scale data challenges, machine learning, advanced visualizations, and interactive user interfaces – to name a few.

Our system performs all day, every day serving global traffic. It’s important we focus on quality at scale in an agile environment that is based on collaboration, ownership, and trust. Our software engineering teams fully own their charter to work on long term roadmaps while enhancing existing features or tools and continuously gaining efficiency.

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. Our team builds and operates critical services including:

• 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.

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 that operate at massive scale. This role sits at the intersection of software engineering, reliability, and security. 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 to include leading technical direction, mentorship, and ownership.

We are a global team with different backgrounds, experiences and perspectives. To complement this team, you will welcome ideas that are different from your own and be well-versed in building from common ground to value, seek out, and foster invisible and visible dimensions of diversity.

• 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

• This role requires comfort operating in ambiguity and driving outcomes that impact the broader platform.

Our culture is much deeper than just having fun together (though, we do that well too...). We take pride in our engineers being trust-builders, generous givers, scrappy problem solvers, and gritty pursuers of excellence. You do not have to meet all the requirements below, but we believe that people who meet most of them will have a higher likelihood of succeeding in this role:

• 7+ years of established experience in a high scale environment that values infrastructure as code capabilities

• 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

• You have a Bachelor’s/Master’s level degree in a computer-science or relevant engineering related field or equivalent experience. Not everyone has the same level of access to opportunities. What is most important to us is what and how you can contribute, which is why our consideration is not limited by the level of education you have.

• 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

Variety of technical opportunity is one of the best things about working at The Trade Desk as a software engineer which is why we do not expect you to know every technology we use when you start. What we care about is that you can learn quickly and find solutions to complex problems using the optimum tools for the job. What you know is less important than how well you learn and innovate.

We don't need engineers who know all the answers; we need engineers who can invent the answers no one has thought of yet, to the questions yet to be asked.