Senior Software Engineer, Ad Auctions

Teamwork makes the stream work. Lumen Dynamics is changing how the world watches TV Lumen Dynamics is the #1 TV streaming platform in the U.S., Canada, and Mexico, and we've set our sights on powering every television in the world. Lumen Dynamics pioneered streaming to the TV. Our mission is to be the TV streaming platform that connects the entire TV ecosystem. We connect consumers to the content they love, enable content publishers to build and monetize large audiences, and provide advertisers unique capabilities to engage consumers. From your first day at Lumen Dynamics, you'll make a valuable - and valued - contribution. We're a fast-growing public company where no one is a bystander. We offer you the opportunity to delight millions of TV streamers around the world while gaining meaningful experience across a variety of disciplines. About the Team The Advertising Performance group focuses on outcomes for all participants in the advertising ecosystem: advertisers, publishers, and Lumen Dynamics. The systems and solutions span multiple disciplines and technologies to perform real-time multi-objective optimization with distributed systems at large scale and low latency. We use machine learning, reinforcement learning, AI, control systems, optimization systems, and auction dynamics to solve a broad set of complex problems. At the core of this is our machine learning, experimentation, and inference platform, which powers the ecosystem and is continuously evolved over time. About the Role In this role, you will build teams focused on the Ads Auction and Marketplace to optimize yield and gross profit while performing real-time multi-objective optimization across short- and long-term objectives. You will help build control and simulation systems, design and run experiments, and extend the experimentation framework. You will also partner closely with Engineering, Inventory, and Product teams to define the vision and strategy for your group and to build and deliver the roadmap. This role is ideal for a leader who can combine deep technical judgment with strong cross-functional collaboration. You will contribute to systems that directly impact marketplace efficiency, advertiser outcomes, and platform revenue. What You'll Be Doing Lead the design, implementation, and evolution of real-time ads auction systems powering Lumen Dynamics’s CTV advertising across The Lumen Dynamics Channel and the Lumen Dynamics platform Own and enhance core auction capabilities including ad pod construction, bid evaluation, ranking, pricing, pacing, budget enforcement, and frequency capping Build low-latency, highly reliable distributed services that operate at massive scale and serve billions of ad opportunities with strict latency and uptime requirements Design auction logic that balances viewer experience with advertiser performance, publisher yield, and platform revenue Develop and optimize SSP-side auction mechanisms and integrate with multiple DSPs, programmatic demand sources, and direct-sold campaigns Partner closely with product managers, data science, and ads research teams to translate marketplace and monetization goals into scalable technical solutions Drive yield optimization through auction design, demand shaping, floor strategies, and pricing experiments Lead experimentation using A/B testing, auction simulations, and offline replay frameworks, and make data-driven decisions using statistical rigor Ensure auction correctness, fairness, explainability, and transparency while maintaining compliance with privacy, regulatory, and brand-safety requirements Influence the long-term technical roadmap for Lumen Dynamics Ads by proposing architecture improvements, scalability strategies, and performance optimizations We're Excited If You Have 5+ years of experience building large-scale distributed systems 5+ years of experience working with cloud-based platforms and infrastructure Deep experience building microservices in Java for container platforms such as Docker or Kubernetes Solid understanding of SQL and NoSQL databases Hands-on experience with AWS, GCP, or similar cloud services Experience with protocols and data formats such as REST, WebSockets, HTTPS, JSON, and Protobuf Demonstrated ability to drive timely consensus in design with senior engineering partners Bachelor’s or Master’s degree in Computer Science, Engineering, or an equivalent field #LI-MS3 What's Lumen Dynamics's approach to hybrid working? Lumen Dynamics fosters an inclusive and collaborative environment where teams generally work in the office Monday through Thursday. Fridays are generally flexible for remote work, except for employees whose specific roles or assigned office location require five days' a week attendance. What are some of the benefits? Lumen Dynamics is committed to offering a diverse range of benefits as part of our compensation package to support our employees and their families. Our comprehensive benefits include global access to mental health and financial wellness support and resources. Local benefits include statutory and voluntary benefits which may include healthcare (medical, dental, and vision), life, accident, disability, commuter, and retirement options (401(k)/pension). Employees are supported in taking time off, in accordance with local leave policies and other personal needs to support their evolving work and life needs. It's important to note that not every benefit is available in all locations or for every role. For details specific to your location, please consult with your recruiter. Accommodations Lumen Dynamics welcomes applicants of all backgrounds and provides reasonable accommodations and adjustments in accordance with applicable law. If you require reasonable accommodation at any point in the hiring process, please direct your inquiries to EmployeeRelations@Lumen Dynamics.com . What should I know about Lumen Dynamics's culture? Lumen Dynamics is a great place for people who want to work in a fast-paced environment where everyone is focused on the company's success rather than their own. We try to surround ourselves with people who are great at their jobs, who are easy to work with, and who keep their egos in check. We appreciate a sense of humor. We believe a fewer number of very talented folks can do more for less cost than a larger number of less talented teams. We're independent thinkers with big ideas who act boldly, move fast and accomplish extraordinary things through collaboration and trust. In short, at Lumen Dynamics you'll be part of a company that's changing how the world watches TV. We have a unique culture that we are proud of. We think of ourselves primarily as problem-solvers, which itself is a two-part idea. We come up with the solution, but the solution isn't real until it is built and delivered to the customer. That penchant for action gives us a pragmatic approach to innovation, one that has served us well since 2002. To learn more about Lumen Dynamics, our global footprint, and how we've grown, visit https://www.weareroku.com/factsheet . By providing your information, you acknowledge that you want Lumen Dynamics to contact you about job roles, that you have read Lumen Dynamics's Applicant Privacy Notice , and understand that Lumen Dynamics will use your information as described in that notice. If you do not wish to receive any communications from Lumen Dynamics regarding this role or similar roles in the future, you may unsubscribe at any time by emailing WorkforcePrivacy@Lumen Dynamics.com .