OpenX Site Reliability Engineer interview questions & guide 2026

Our interview process is designed to evaluate your technical depth and your ability to work within a highly collaborative, global engineering culture. While questions vary by team and seniority, the following categories capture the core themes you will encounter.

Technical & Architecture

These questions test your ability to handle massive-scale systems and your familiarity with cloud-native environments.

• Describe one of your GitHub projects in-depth, focusing on the technical challenges you solved.
• How would you approach architecting a service that handles a massive influx of daily ad requests?

Preparation at OpenX should focus on demonstrating how you apply engineering discipline to real-world infrastructure problems. Don't just list the tools you know; explain the why behind your architectural choices.

System Design & Scale – We look for candidates who understand the implications of operating at a massive scale. You should be prepared to discuss trade-offs in distributed systems, latency management, and infrastructure reliability.

Automation Mindset – We value engineers who are allergic to manual work. Highlight projects where you successfully reduced toil and improved system efficiency through code.

Communication Skills – As a globally distributed team, your ability to articulate technical concepts clearly is a key differentiator. Practice explaining your past projects with a focus on impact and collaboration.

The OpenX interview process is designed to be rigorous but transparent. It typically begins with an initial screening to gauge your background and alignment with our core engineering values. Following this, you will move into a series of technical deep dives. These often include a review of your past work—such as your GitHub projects—and discussions regarding high-level system architecture with engineers from our various global offices.

Expect a process that values direct engagement. We prioritize technical competency and a "get-things-done" attitude. You will likely interact with both the Hiring Manager and prospective teammates, ensuring a two-way evaluation of whether our culture and your career goals are a match.

The timeline above represents a typical progression from initial screening through technical deep-dives. Use this to pace your preparation, ensuring you have enough time to review your own technical portfolio and brush up on cloud-native architecture concepts before the onsite or final rounds.

Architecture & Infrastructure

We evaluate your ability to design systems that are resilient, scalable, and maintainable. We look for a deep understanding of cloud-native principles.

Be ready to go over:

• Cloud-native design – How you build services specifically for environments like GCP.
• System monitoring – Tools and strategies for maintaining visibility across 140 TB of daily RAM usage.

As a Site Reliability Engineer at OpenX, your day-to-day work centers on the reliability and evolution of our platform. You will spend a significant portion of your time identifying bottlenecks in our ad-serving pipeline and implementing automated fixes.

You will work closely with other engineering teams to ensure that new features are built with reliability in mind from day one. Collaboration is key; you will often be coordinating with global teams to maintain 24x7 service levels, ensuring that our infrastructure not only keeps pace with our growth but drives it. You are expected to be an active contributor to our cloud strategy, constantly pushing the boundaries of what our GCP footprint can achieve.

We are looking for seasoned engineers who are comfortable navigating the complexities of high-scale systems.

• Must-have skills:

• Deep experience with Cloud Computing (specifically GCP).

• Strong proficiency in Automation and scripting to eliminate manual toil.

• Demonstrated experience in managing large-scale, high-traffic production environments.

• Excellent English communication skills for collaborating with global teams.

• Nice-to-have skills:

• Experience in the AdTech industry.

• Familiarity with infrastructure-as-code tools and continuous deployment pipelines.

Q: How difficult are the technical interviews? A: They are challenging and focused on real-world application. Expect to discuss your past projects in great detail rather than answering abstract, theoretical riddles.

Q: What is the culture like? A: OpenX is a place for creative executors. We value autonomy, technical innovation, and a collaborative spirit. If you are someone who enjoys solving problems that others haven't even encountered yet, you will fit in well.

Q: How long does the process take? A: The process is designed to be efficient, but it can vary based on team availability. You will generally receive clear feedback after each major stage.

• Show your work: Since we often discuss your own projects, ensure your GitHub or portfolio is up to date and reflects your best, most complex work.
• Be ready for global collaboration: Emphasize your experience working with remote or international teams.
• Focus on impact: When describing your accomplishments, always quantify them. Use numbers—like the scale of requests or the number of deployments—to show the magnitude of your work.

A Site Reliability Engineer role at OpenX is a career-defining opportunity to operate at a scale that is truly rare in the industry. By focusing your preparation on your hands-on experience with cloud-native systems, your ability to automate away toil, and your capacity to communicate across global teams, you will be well-positioned to succeed.

We encourage you to explore additional interview insights, practice questions, and preparation resources on Dataford to further refine your approach. You have the skills to handle the scale and complexity of our systems; now, focus on articulating that expertise with confidence.

The compensation data above provides a range for the Site Reliability Engineer IV position, reflecting base salary and potential B2B contracts. Candidates should view this as a competitive baseline for high-level engineering roles in our sector, with total compensation often tailored to individual experience and market location.