Senior Software Engineer, .NET

Cognitiv•Bellevue, WA

7d•Hybrid

About The Position

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! The role We’re looking for a Senior Software Engineer, Backend to join our growing Integrations team. This role is critical to building and scaling the systems that power Cognitiv’s partnerships with other platforms and clients. You’ll work across our suite of products, enhancing backend services, developing APIs, and supporting new integrations that directly drive revenue and customer impact. You’ll be joining a highly collaborative environment — working closely with Business Development, Customer Success, and Product teams to deliver seamless integrations that help our clients achieve their advertising goals. Location: Hybrid MTW in Bellevue Office.

Requirements

You’re an experienced backend engineer who thrives in ambiguous, fast-paced environments.
You love exploring and improving complex systems — not afraid to jump into unfamiliar codebases.
You communicate clearly and collaborate effectively across technical and non-technical teams.
You care about code quality, testing, and operational excellence just as much as you care about shipping features.
You take ownership of your work and follow projects through from idea to production.

Nice To Haves

Experience working on integrations or partner-facing systems.
Background in AdTech, MarTech, or Data Engineering.
Familiarity with CI/CD pipelines and monitoring tools (Grafana, Datadog, etc.).
Exposure to distributed systems, large-scale APIs, or event-driven architectures.

Responsibilities

Build and maintain scalable, reliable backend systems that power integrations across multiple products.
Collaborate with cross-functional teams (Business Development, Product, Customer Success) to define requirements and deliver solutions that enable new business opportunities.
Dive deep into a large, multi-product codebase — debugging, optimizing, and improving backend performance.
Write clean, maintainable, and well-tested code with a strong focus on operational excellence.
Ensure backend systems are well-documented, observable, and resilient in production.
Identify opportunities to automate processes, improve performance, and enhance system reliability.