Staff Software Engineer, Backend

Are you ready to revolutionize the advertising industry?

At Cognitiv, we are not just another AdTech company—we are industry trailblazers redefining media buying with our Deep Learning Advertising Platform. Since 2015, we have harnessed the power of cutting‑edge deep learning technology and data science to transform how brands connect with their customers. Our mission? To bring intelligence to advertising and deliver unparalleled precision, relevance, and impact at scale.

With our innovative platform, advertisers enjoy unprecedented flexibility—whether it is activating Dynamic Deals through their preferred DSP, leveraging our managed service DSP, or utilizing our industry‑first ContextGPT product. As a part of Cognitiv, you will be at the forefront of AI‑driven advertising solutions, driving change and achieving remarkable growth in a rapidly evolving industry.

Now, we’re growing!

We’re hiring a Senior Software Engineer (Backend) to join the team building our next‑generation, pixel‑less ad targeting systems. You’ll design, build, and scale systems that power cutting‑edge AI‑driven advertising products, while improving and evolving existing platforms to meet growing business needs.

This role is accountable for scaling our ContextGPT revenue by building and supporting system integrations that make it available to more customers, more partners, and more supply. This engineer will work closely with our internal platform teams and external partners to make ContextGPT available across the ad‑tech ecosystem.

This position will be located in Bellevue with a hybrid work schedule of 3 days in office (Mon/Tue/Wed) and 2 days remote optional (Thursday/Friday).

• Design, build, and own backend services and APIs in .NET Core on AWS that power ContextGPT integrations across the ad‑tech ecosystem
• Drive integrations with new data centers and third‑party partners to expand inventory access and unlock new revenue streams
• Address scaling challenges as ContextGPT continues its rapid growth trajectory
• Collaborate with internal platform teams and external partners to make ContextGPT available at scale
• Take full ownership of systems end‑to‑end — from design through production operations
• Drive improvements in performance, reliability, and developer productivity across the team

• Experienced senior backend engineer:
  Strong in .NET Core (or a similar strongly typed language (Java, Kotlin, etc) and AWS, with a track record of designing and delivering complex production systems end‑to‑end
• Systems thinker:
  Comfortable navigating a large, multi‑product codebase and reasoning across service boundaries
• Ownership, Drive & Agency:
  You take full responsibility for outcomes, not just tasks. You work independently, prioritize effectively, and proactively deliver high‑impact results without waiting to be directed. This is the most important thing to us.
• Excellent communicator:
  You collaborate effectively with both internal teams and external partners, and resolve conflicts constructively
• Quality‑focused:
  Demonstrated emphasis on testing, maintainability, and operational excellence
• Resilient & gritty:
  You thrive in ambiguity, manage competing priorities, and push through obstacles
• In‑person collaborator:
  You want to work onsite MTW in Bellevue, WA

• Prior experience with integrations or partner‑facing development
• AdTech or programmatic advertising background
• Startup experience (fast‑moving, lean environments)
• Exposure to CI/CD pipelines and automated testing frameworks
• Hands‑on experience with our stack: .NET Core, AWS, RDS, Click House, Datadog

• Ramp quickly on ContextGPT — the product, its architecture, key stakeholders, and the ad‑tech ecosystem it operates in
• Build strong context on current integration patterns and the scaling challenges ahead
• Establish relationships with key internal and external partners
• Identify early opportunities to improve reliability, performance, or developer experience

• Begin independently owning integration development and…