Lead Software Engineer- Englewood, CO or Sunnyvale, CA- ONSITE 4X Weely- FreeWheel

Comcast • Englewood, CO

1d • Onsite

About The Position

FreeWheel, a Comcast company, is seeking a Lead Software Engineer (ENG 5) to serve as a principal-level individual contributor driving the technical direction of its Buyer Cloud Ad Serving platform. The Ad Serving system is the high-throughput backbone of FreeWheel's demand-side platform, processing billions of ad auctions daily, executing complex real-time decisioning strategies, and delivering responses in single-digit milliseconds. This role leads the architecture of mission-critical distributed systems, addresses performance and scale challenges, and influences engineering practices across multiple teams without direct people-management responsibilities.

The role is based in Englewood, Colorado, or Sunnyvale, California, and requires onsite work four times per week. The position involves regular, consistent, and punctual attendance and may require nights, weekends, and variable schedules as necessary. Other duties and responsibilities may be assigned.

The position is expected to exercise independent judgment and discretion in matters of significance. Employees at all levels are expected to follow Comcast's Operating Principles, prioritize the customer experience, learn and advocate for the company's technology and services, work as a team, participate in the Net Promoter System, drive results and growth, support inclusion, and act in the interests of colleagues, customers, investors, and communities.

Requirements

• Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field, or equivalent practical experience; the posting also states a Bachelor's Degree and notes that coursework and experience or extensive related professional experience may be considered.
• The Ideal Skillset section states 13+ years of professional software engineering experience, including 2+ years in a Staff or Lead Engineer role; the posting's separate Relevant Work Experience field states 10 Years +.
• Expert-level proficiency in a compiled or high-performance language such as C++, Go, Java, or Rust.
• Proven track record designing, operating, and troubleshooting large-scale distributed backend systems in production.
• Deep understanding of concurrency, multithreading, memory management, networking protocols, and performance profiling on Linux.
• Experience building containerized, cloud-native services using AWS, Kubernetes, ECS, or equivalent, with robust metrics, tracing, and logging.
• Ability to work onsite four times per week in Englewood, Colorado, or Sunnyvale, California.
• Ability to work nights and weekends and variable schedules as necessary.

Nice To Haves

• Experience with ultra-low-latency, real-time decisioning systems, such as AdTech/DSPs, financial trading, real-time analytics, or high-frequency auction systems.
• Experience handling petabyte-scale datasets or systems processing millions of requests per second.
• Familiarity with distributed datastores and storage platforms such as Aerospike, Snowflake, or event-streaming architectures.
• Demonstrated experience modernizing legacy architectures and driving cloud-native adoption.

Responsibilities

• Lead the end-to-end architecture, design, and execution of highly scalable, low-latency backend services for the Buyer Cloud platform.
• Drive multi-team initiatives focused on platform reliability, system decomposition, scalability, and operational excellence.
• Identify and eliminate performance bottlenecks in distributed workflows operating under strict latency budgets.
• Partner with Product, Infrastructure, SRE, and Data Engineering to define technical roadmaps and align technical strategy with business goals.
• Establish best practices for design reviews, code quality, testing, observability, and incident root-cause analysis.
• Mentor senior- and mid-level engineers through design coaching, code reviews, and architectural guidance.
• Exercise independent judgment and discretion in matters of significance.
• Maintain regular, consistent, and punctual attendance; work nights and weekends and variable schedules as necessary.
• Perform other duties and responsibilities as assigned.
• Follow Comcast's Operating Principles, prioritize customer experience, work collaboratively, participate in the Net Promoter System, drive results and growth, and support a culture of inclusion.

Benefits

• Eligible employees receive a range of benefits intended to support physical, financial, and emotional well-being; details are available in Comcast's compensation and benefits summary.
• Most non-sales positions are eligible for a bonus.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior