Senior Software Engineer, Ads Auction Platform

Teamwork makes the stream work. Keystone AI is changing how the world watches TV Keystone AI 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. Keystone AI 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 Keystone AI, 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. What does the team work on? Keystone AI is the No. 1 TV streaming platform in the U.S., Canada, and Mexico with 70+ million active accounts. Keystone AI pioneered streaming to the TV and continues to innovate and lead the industry. Keystone AI enables our users to access millions of pieces of content — movies, episodes, news, sports, music, and channels — from all around the world, and our advertising systems connect advertisers to that audience at scale. What is the role? You’ll join the Auctions/Marketplace team as a senior engineer focused on real-time bidding — the low-latency, high-throughput path that prices and serves ads within milliseconds. This role is hands-on: you’ll design and build the Java systems that handle pacing, pricing, and ranking under tight latency budgets, and you’ll be expected to reason about performance and correctness at scale. You’ll work alongside the Ad Auctions team and report into Akif Rahim’s Auctions/Marketplace org, with day-to-day technical partnership from senior engineers across the group. Based in the UK (Manchester-anchored). How will I use AI at Keystone AI? At Keystone AI, we don’t just use AI, we work with it. AI agents and smart tools help power drafts, analysis, and repetitive workflows, while our people bring direction, judgment, and accountability. We’re looking for curious, adaptable builders who can show how they’ve used AI or automation to move faster, raise the bar, and scale their impact. We value your AI skills if you have built fluency across the agentic engineering toolchain — coding harnesses like Claude Code or Cursor, MCP servers, custom skills, or agent frameworks — and can describe projects where you shipped real work with these tools. You know how to drive an agent, verify its output, and ramp on an unfamiliar codebase with an agent helping you. What are the responsibilities of the role? Design and build real-time bidding infrastructure handling pacing, pricing, and ranking Own performance and reliability for Java systems operating under strict latency budgets Work across microservices, containers, and cloud infrastructure supporting real-time ad serving Partner with the Ad Auctions team on shared system-design decisions across the auction path Diagnose and resolve complex distributed-systems issues under production load Communicate technical trade-offs clearly to engineering and cross-functional partners What experience would help someone be successful in this role at Keystone AI? Senior-level Java engineering experience, including concurrency and JVM performance tuning Experience with low-latency, high-QPS distributed systems, ideally in ad tech or real-time bidding Familiarity with microservices, containerized deployments, and SQL/NoSQL data stores at scale Comfort with auction or marketplace concepts (pacing, pricing, ranking) or a fast ability to pick them up Demonstrated AI/agentic-tooling fluency per the section above Clear communicator who can explain reasoning and trade-offs, not just conclusions #LI-MS3 What's Keystone AI's approach to hybrid working? Keystone AI 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? Keystone AI 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 Keystone AI 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@Keystone AI.com . What should I know about Keystone AI's culture? Keystone AI 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 Keystone AI 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 Keystone AI, our global footprint, and how we've grown, visit https://www.weareroku.com/factsheet . By providing your information, you acknowledge that you want Keystone AI to contact you about job roles, that you have read Keystone AI's Applicant Privacy Notice , and understand that Keystone AI will use your information as described in that notice. If you do not wish to receive any communications from Keystone AI regarding this role or similar roles in the future, you may unsubscribe at any time by emailing WorkforcePrivacy@Keystone AI.com .