Principal Engineer, Real Time Platform

Senior Software Engineer, Real Time PlatformThe AppNexus Platform was built upon the foundation that we could help our clients buy and sell media in the most effective and efficient way possible. AppNexus has since then become a pioneer in developing real-time technology into various aspects of our platform stack to make our advertising solution one of the fastest, most reliable, and massively scaled systems in the industry. In the past 3 years, we've grown from processing 300k QPS to over 5 million QPS for an approximate total of 100 billion requests per day. These events generate more than 150 TB of new data every day. Engineers work on the real-time components to optimize our software for performance, space, and algorithmic efficiency. This is an energizing community of engineers that is committed to building dependable products – the software and systems being built drive our real-time bidding business along with a multitude of other core initiatives for AppNexus. We work under strict real-time constraints, responding to and executing real-time, dynamic auctions in less than 100 milliseconds.Consider some of the problems you will try to solve:Large-scale distributed systems: Our real-time budget problem requires pushing updates on millions of objects to thousands of machines using our custom caching solution all while observing strict SLA requirements.Interesting algorithmic problems: Use the latest research and techniques to make full use of the underlying hardware and instruction sets, utilizing things like lock-free data structures and intelligent thread design to optimize revenue, memory footprint, and overall algorithmic efficiency.Programming, probability and statistics: We predict and track the performance of thousands of advertising campaigns that bid on a cost per impression, cost per click, and cost per acquisition basis. Now try to do this at 5 million times in 100ms or less.About the job:Provide technical leadership to fellow engineers in the development of a robust, enterprise-grade platform that requires hard real-time constraintMake substantial contributions to AppNexus’ intellectual propertyOwn large portions of the architecture of a platform that has direct impact on the direction of our industry Participate in regular architecture reviews and provide direction that improves the designWork closely with other engineers and our Product teams, to not only make these systems go faster and handle more data, but also to build revolutionary new features for our clientsAnalyze and improve our software development life cycle processes (e.g. testing, building, deployment, monitoring, etc.)Participate in the process of building our teams; including recruiting, interviewing, and onboardingContribute to the planning process of project development and ensure timely delivery of asset to productionBuild an understanding of the on-line advertising ecosystem and use your engineering expertise to build innovative solutionsAbout your skills:BA/BS degree and 10+ years of experienceExperience using either C, C++, or Java, with excellent and creative problem-solving abilitiesExperience building high performance, multi-threaded, distributed systems and applications, preferably in a Linux environmentExperience practicing advanced optimization techniquesExperience with real-time data processing engines, ultra-low-level, and low latency systems is preferredExcellent Computer Science fundamentals with regards to data structures, algorithms, time complexity, etc.More about you:You are passionate about a culture of learning and teaching. You love challenging yourself to constantly improve, and sharing your knowledge to empower othersYou like to take risks when looking for novel solutions to complex problems. If faced with roadblocks, you continue to reach higher to make greatness happenYou care about solving big, systemic problems. You look beyond the surface to understand root causes so that you can build long-term solutions for the whole ecosystemYou believe in not only serving customers, but also empowering them by providing knowledge and toolsLearn. Teach. Build.AppNexians make greatness happenJoin our communityAppNexus is proud to offer equal opportunity in all aspects of employment. We strive to foster a diverse, inclusive and engaging work environment. We welcome applications from all candidates and look forward to receiving yours. Our diversity in action:Partnering with Path Forward to offer returnships to help caregivers reenter the workforceSharing feedback openly through roundtable discussions on how to make progress on our Diversity & Inclusion goalsCelebrating our diversity with affinity groups (including OutNexus, AppNexus Women’s Network, AppNexus Latino alliance and AppNexus Black Alliance to name just a few!)

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