Senior Level Onsite Engineer Jobs
Senior level onsite engineer jobs place experienced engineers in charge of technical direction, project ownership, and the cross-functional teams that deliver complex systems on the ground. Hiring is concentrated in Energy, Construction & Real Estate, and Consulting & Professional Services, with fully onsite and hybrid environments both active, and employers like Burns & McDonnell, CB&I, and Comcast hiring at this level now.
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Showing 5 of 9+ Senior Level Onsite Engineer jobs
FreeWheel, a Comcast company, provides comprehensive ad platforms for publishers, advertisers, and media buyers. Powered by premium video content, robust data, and advanced technology, we’re making it easier for buyers and sellers to transact across all screens, data types, and sales channels. As a global company, we have offices in nine countries and can insert advertisements around the world.
Job Summary
FreeWheel is seeking a Lead Software Engineer (ENG 5) to serve as a principal-level individual contributor driving the technical direction of our Buyer Cloud Ad Serving platform. The Ad Serving system is the high-throughput backbone of FreeWheel's demand-side platform (DSP). It processes billions of ad auctions daily, executes complex real-time decisioning strategies, and delivers responses in single-digit milliseconds. In this role, you will lead the architecture of mission-critical distributed systems, tackle complex performance and scale challenges, and influence engineering practices across multiple teams all without direct people management responsibilities
Job Description
Responsibilities:
- Architectural Leadership: Lead the end-to-end architecture, design, and execution of highly scalable, low-latency backend services for the Buyer Cloud platform.
- Strategy: Drive multi-team initiatives centered on platform reliability, system decomposition, scalability, and operational excellence.
- System Optimization: Identify and eliminate performance bottlenecks in distributed workflows operating under strict latency budgets.
- Cross-Functional Partnership: Partner with Product, Infrastructure, SRE, and Data Engineering to define technical roadmaps and align technical strategy with business goals.
- Engineering Standards: Establish best practices for design reviews, code quality, testing, observability, and incident root-cause analysis (RCA).
- Mentorship & Talent Growth: Mentor senior and mid-level engineers through design coaching, code reviews, and architectural guidance.
- Consistent exercise of independent judgment and discretion in matters of significance.
- Regular, consistent and punctual attendance. Must be able to work nights and weekends, variable schedule(s) as necessary.
- Other duties and responsibilities as assigned
The Ideal Skillset:
- Education: Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field (or equivalent practical experience).
- Experience: 13+ years of professional software engineering experience, including 2+ years in a Staff or Lead Engineer role.
- Core Languages: Expert-level proficiency in compiled/high-performance languages (C++, Go, Java, or Rust).
- Distributed Systems: Proven track record of designing, operating, and troubleshooting large-scale distributed backend systems in production.
- Systems Engineering: Deep understanding of concurrency, multithreading, memory management, networking protocols, and performance profiling on Linux.
- Cloud & Infrastructure: Experience building containerized, cloud-native services (AWS, Kubernetes, ECS, or equivalent) with robust observability (metrics, tracing, logging).
Bonus Points:
- Experience with ultra-low-latency, real-time decisioning systems (e.g., AdTech/DSPs, financial trading, real-time analytics, high-frequency auction systems).
- Experience handling petabyte-scale datasets or systems processing millions of requests per second (RPS).
- Familiarity with distributed datastores and storage platforms (e.g., Aerospike, Snowflake, event streaming architectures).
- Demonstrated experience modernizing legacy architectures and driving cloud-native adoption.
Employees at all levels are expected to:
- Understand our Operating Principles; make them the guidelines for how you do your job.
- Own the customer experience think and act in ways that put our customers first, give them seamless digital options at every touchpoint, and make them promoters of our products and services.
- Know your stuff be enthusiastic learners, users and advocates of our game-changing technology, products and services, especially our digital tools and experiences.
- Win as a team make big things happen by working together and being open to new ideas.
- Be an active part of the Net Promoter System a way of working that brings more employee and customer feedback into the company by joining huddles, making call backs and helping us elevate opportunities to do better for our customers.
- Drive results and growth.
- Support a culture of inclusion in how you work and lead.
- Do what's right for each other, our customers, investors and our communities.
Disclaimer: This information has been designed to indicate the general nature and level of work performed by employees in this role. It is not designed to contain or be interpreted as a comprehensive inventory of all duties, responsibilities and qualifications.
Comcast is an equal opportunity workplace. We will consider all qualified applicants for employment without regard to race, color, religion, age, sex, sexual orientation, gender identity, national origin, disability, veteran status, genetic information, or any other basis protected by applicable law.
Skills:
C++ Programming Language; Low Latency; Java (Programming Language); AWS Architecture; Go Programming Language
Salary:
Colorado Pay Range: $160,106.35 - $240,159.53
Additional Range: This job can be performed in California with a good faith estimated pay range upon hire of $130,996.11 USD - $242,585.38.
Comcast intends to offer the selected candidate base pay within the posted range for this role at the time of posting dependent on job-related, non-discriminatory factors such as experience. The application window is 30 days from the date job is posted, unless the number of applicants requires it to close sooner or later.
The application window is 30 days from the date job is posted, unless the number of applicants requires it to close sooner or later.
Base pay is one part of the Total Rewards that Comcast provides to compensate and recognize employees for their work. Most sales positions are eligible for a Commission under the terms of an applicable plan, while most non-sales positions are eligible for a Bonus. Additionally, Comcast provides best-in-class Benefits to eligible employees. We believe that benefits should connect you to the support you need when it matters most, and should help you care for those who matter most. That’s why we provide an array of options, expert guidance and always-on tools, that are personalized to meet the needs of your reality - to help support you physically, financially and emotionally through the big milestones and in your everyday life. Please visit the compensation and benefits summary on our careers site for more details.
Education
Bachelor's Degree
While possessing the stated degree is preferred, Comcast also may consider applicants who hold some combination of coursework and experience, or who have extensive related professional experience.
Relevant Work Experience
10 Years +
FreeWheel, a Comcast company, provides comprehensive ad platforms for publishers, advertisers, and media buyers. Powered by premium video content, robust data, and advanced technology, we’re making it easier for buyers and sellers to transact across all screens, data types, and sales channels. As a global company, we have offices in nine countries and can insert advertisements around the world.
Job Summary
FreeWheel is seeking a Lead Software Engineer (ENG 5) to serve as a principal-level individual contributor driving the technical direction of our Buyer Cloud Ad Serving platform. The Ad Serving system is the high-throughput backbone of FreeWheel's demand-side platform (DSP). It processes billions of ad auctions daily, executes complex real-time decisioning strategies, and delivers responses in single-digit milliseconds. In this role, you will lead the architecture of mission-critical distributed systems, tackle complex performance and scale challenges, and influence engineering practices across multiple teams all without direct people management responsibilities
Job Description
Responsibilities:
- Architectural Leadership: Lead the end-to-end architecture, design, and execution of highly scalable, low-latency backend services for the Buyer Cloud platform.
- Strategy: Drive multi-team initiatives centered on platform reliability, system decomposition, scalability, and operational excellence.
- System Optimization: Identify and eliminate performance bottlenecks in distributed workflows operating under strict latency budgets.
- Cross-Functional Partnership: Partner with Product, Infrastructure, SRE, and Data Engineering to define technical roadmaps and align technical strategy with business goals.
- Engineering Standards: Establish best practices for design reviews, code quality, testing, observability, and incident root-cause analysis (RCA).
- Mentorship & Talent Growth: Mentor senior and mid-level engineers through design coaching, code reviews, and architectural guidance.
- Consistent exercise of independent judgment and discretion in matters of significance.
- Regular, consistent and punctual attendance. Must be able to work nights and weekends, variable schedule(s) as necessary.
- Other duties and responsibilities as assigned
The Ideal Skillset:
- Education: Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field (or equivalent practical experience).
- Experience: 13+ years of professional software engineering experience, including 2+ years in a Staff or Lead Engineer role.
- Core Languages: Expert-level proficiency in compiled/high-performance languages (C++, Go, Java, or Rust).
- Distributed Systems: Proven track record of designing, operating, and troubleshooting large-scale distributed backend systems in production.
- Systems Engineering: Deep understanding of concurrency, multithreading, memory management, networking protocols, and performance profiling on Linux.
- Cloud & Infrastructure: Experience building containerized, cloud-native services (AWS, Kubernetes, ECS, or equivalent) with robust observability (metrics, tracing, logging).
Bonus Points:
- Experience with ultra-low-latency, real-time decisioning systems (e.g., AdTech/DSPs, financial trading, real-time analytics, high-frequency auction systems).
- Experience handling petabyte-scale datasets or systems processing millions of requests per second (RPS).
- Familiarity with distributed datastores and storage platforms (e.g., Aerospike, Snowflake, event streaming architectures).
- Demonstrated experience modernizing legacy architectures and driving cloud-native adoption.
Employees at all levels are expected to:
- Understand our Operating Principles; make them the guidelines for how you do your job.
- Own the customer experience think and act in ways that put our customers first, give them seamless digital options at every touchpoint, and make them promoters of our products and services.
- Know your stuff be enthusiastic learners, users and advocates of our game-changing technology, products and services, especially our digital tools and experiences.
- Win as a team make big things happen by working together and being open to new ideas.
- Be an active part of the Net Promoter System a way of working that brings more employee and customer feedback into the company by joining huddles, making call backs and helping us elevate opportunities to do better for our customers.
- Drive results and growth.
- Support a culture of inclusion in how you work and lead.
- Do what's right for each other, our customers, investors and our communities.
Disclaimer: This information has been designed to indicate the general nature and level of work performed by employees in this role. It is not designed to contain or be interpreted as a comprehensive inventory of all duties, responsibilities and qualifications.
Comcast is an equal opportunity workplace. We will consider all qualified applicants for employment without regard to race, color, religion, age, sex, sexual orientation, gender identity, national origin, disability, veteran status, genetic information, or any other basis protected by applicable law.
Skills:
C++ Programming Language; Low Latency; Java (Programming Language); AWS Architecture; Go Programming Language
Salary:
Colorado Pay Range: $160,106.35 - $240,159.53
Additional Range: This job can be performed in California with a good faith estimated pay range upon hire of $130,996.11 USD - $242,585.38.
Comcast intends to offer the selected candidate base pay within the posted range for this role at the time of posting dependent on job-related, non-discriminatory factors such as experience. The application window is 30 days from the date job is posted, unless the number of applicants requires it to close sooner or later.
The application window is 30 days from the date job is posted, unless the number of applicants requires it to close sooner or later.
Base pay is one part of the Total Rewards that Comcast provides to compensate and recognize employees for their work. Most sales positions are eligible for a Commission under the terms of an applicable plan, while most non-sales positions are eligible for a Bonus. Additionally, Comcast provides best-in-class Benefits to eligible employees. We believe that benefits should connect you to the support you need when it matters most, and should help you care for those who matter most. That’s why we provide an array of options, expert guidance and always-on tools, that are personalized to meet the needs of your reality - to help support you physically, financially and emotionally through the big milestones and in your everyday life. Please visit the compensation and benefits summary on our careers site for more details.
Education
Bachelor's Degree
While possessing the stated degree is preferred, Comcast also may consider applicants who hold some combination of coursework and experience, or who have extensive related professional experience.
Relevant Work Experience
10 Years +
See All 9 Senior Level Onsite Engineer Jobs
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Find JobsSenior Level Onsite Engineer Job Market
Who's Hiring
Top Industries Hiring
- Energy
- Construction & Real Estate
- Consulting & Professional Services
Senior Level Onsite Engineer Jobs: Frequently Asked Questions
How do I get a senior level onsite engineer job?
Employers hiring at this level look for engineers who have owned outcomes end-to-end, not just contributed to them. Demonstrating that you have driven projects from scoping through delivery, resolved systemic technical problems, and mentored junior engineers will set you apart. Tailoring your resume to show scope of ownership and cross-functional leadership, rather than task completion, makes the strongest impression at this stage.
Which companies hire senior level onsite engineers?
Companies hiring senior level onsite engineers right now include Burns & McDonnell, CB&I, and Comcast, based on current listings on Migrate Mate as of November 2026. Hiring at this level tends to come from established organizations running large-scale infrastructure, capital-intensive operations, or complex engineering programs that require experienced technical leads on the ground.
Are there remote senior level onsite engineer jobs?
Yes, though onsite engineer roles are inherently field- or facility-focused by nature. About 0% of senior level onsite engineer openings are remote or hybrid as of November 2026, which typically reflects roles where planning, coordination, or oversight work can be done off-site while hands-on responsibilities are handled during scheduled on-site periods.
What makes an onsite engineer role senior level?
Senior level onsite engineer roles are defined by scope of ownership, technical depth, and leadership responsibility. At this stage, engineers are expected to set technical direction, make consequential decisions independently, lead project teams or workstreams, and mentor less experienced colleagues. The work shifts from executing defined tasks to defining how work gets done and ensuring the broader team delivers.
Which industries hire the most senior level onsite engineers?
Senior level onsite engineer roles concentrate in Energy, Construction & Real Estate, and Consulting & Professional Services, based on current listings on Migrate Mate as of November 2026. These sectors drive hiring at this level because they operate complex physical infrastructure, capital equipment, or large-scale field programs that require experienced engineers with the judgment and leadership to manage technical risk directly on site.