Software Engineer, Backend New Bellevue, WA

Cognitiv; Bellevue (WA); Hybrid; USD 130,000 - 170,000; Full time

Benefits offered by this job

Health coverage

Parental leave

Unlimited PTO

Hybrid work

Equity

Team lunch

Wellness stipend

Retirement plan

Job summary

Cognitiv is a pioneering AdTech company redefining media buying with its Deep Learning Advertising Platform. As a Backend Software Engineer on the Core team, you will own end-to-end platform challenges—from design through production—impacting real-time bidding and campaign execution systems.

You will deliver reliable code with observability, help maintain service SLOs, and collaborate across teams while mentoring juniors.

Qualifications

• Strong programming in one or more modern backend languages (preferably .NET Core/C#).
• Experience building and shipping production software in a collaborative environment.
• Relational databases (PostgreSQL/SQL) and high-volume data stores.

Responsibilities

• Own feature delivery from kickoff through post-launch support.
• Deliver production-ready code with observability and test coverage ≥ 80%.
• Maintain service SLOs with proactive alerts and dashboards.

Skills

C#/.NET

SQL/PostgreSQL

DataDog/AWS

Backend architecture

Testing & quality

On-call readiness

Communication

End-to-end delivery

Ambiguity handling

Tools

ClickHouse

Git

Docker

Kubernetes

Job description

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

The Core team builds the foundational platform powering Cognitiv’s real-time bidding and campaign execution engine. Every campaign on our DSP flows through this platform—managing budgets, pacing, strategies, creatives, and configuration while feeding vital controls to high-scale downstream systems. As our scope expands, we’re looking for engineers who want to own meaningful platform architecture rather than take on narrow subsystem tickets.

As a Backend Software Engineer on the Core team, you will take on substantial platform challenges and carry them end-to-end from design through production. You will translate business and performance requirements into reliable, production-ready software across our campaign management systems while driving code quality, system stability, and steady engineering progress.

Your Impact

In this role, success is measured by the quality, reliability, and consistency of your engineering contributions. You will:

• Own Feature Delivery: Take responsibility for a feature from kickoff through post-launch support, owning the release plan, branch strategy, canary, and automated rollback.
• Deliver Reliable Code: Author production-ready code with meaningful observability (metrics/traces/logs) and automated test coverage ≥ 80%. Recognize edge cases and propose straightforward solutions with moderate guidance.
• Strengthen Reliability: Keep service SLOs green by adding missing alerts and dashboards proactively. Participate in on-call and contribute to blameless post-mortems with actionable follow-ups within sprint.
• Contribute to Design: Author design docs for single-feature or single-service work that incorporate cost, scale, and rollback considerations. Connect features to OKRs or user metrics and advocate for small UX improvements.
• Collaborate & Mentor: Facilitate design or planning meetings for the team, build trust with adjacent teams through reliable follow-through, and mentor interns or new hires on the codebase and processes.

Tech Stack: .NET Core (C#), SQL/Postgres, ClickHouse, AWS, DataDog

Required Experience & Capabilities

• Technical Proficiency: Strong programming skills in one or more modern backend languages (preferably .NET Core/C#), with experience building and shipping production software in a collaborative engineering environment.
• Data Systems: Hands-on experience working with relational databases (PostgreSQL/SQL) and high-volume data stores.
• Engineering Craft: Solid understanding of testing, debugging, code review, and software development best practices; consistently delivers well-tested, maintainable code.
• Delivery: Track record of independently delivering small-to-medium features end-to-end—from design through deployment—within a sprint cadence.
• Operational Awareness: Familiarity with on-call responsibilities, runbooks, and contributing to system reliability and operational health. (DataDog, AWS)
• Communication: Clear communicator who can explain decisions and collaborate effectively with technical and non-technical partners.
• Ability to Deliver & Ownership: Proven track record of independently taking small-to-medium features from concept to production within a sprint cadence, taking end-to-end accountability for code quality, rollouts, and post-launch health.
• Dealing with Ambiguity & Autonomy: Comfortable breaking down loosely-scoped tickets into clear technical tasks, asking the right questions early, and executing with moderate guidance rather than step-by-step direction.
• Learning & Adaptation: Quick to adopt new technologies, operational tools, and domain concepts, adjusting smoothly as system needs and business priorities evolve.

Bonus Points

• Platform & Tooling Experience: Experience with cloud platforms, distributed systems, or improving developer workflows, documentation, or internal tooling.
• Adtech/RTB Experience: Background in real-time bidding, ad serving, or similarly latency-sensitive, high-throughput systems is a plus.

Salary: $130,000 - $170,000 USD Base Salary + Equity

What We Offer

Compensation is based on experience, skills, and other factors. Base salary is just one part of your total rewards at Cognitiv—you’ll also receive equity and a comprehensive benefits package.

Highlights include:

• Medical, Dental and Vision plan for US employees & Extended Health Benefits for Canadian employees
• 12 weeks paid parental leave + 4 weeks WFH
• Unlimited PTO + Work-From-Anywhere August
• Career development with clear advancement paths
• Equity for all employees
• Hybrid work model & daily team lunch
• Health & wellness stipend + cell phone reimbursement
• 401(k) & RRSP with employer match
• Employee Assistance Program
• …and more!

What You’ll Find at Cognitiv

• Festiv – We make work fun with cross-team games, events, and creative team bonding.
• Responsiv – You’ll be close to clients and leadership, influencing real outcomes.
• Inclusiv – Diversity and individuality are celebrated across all levels.
• Inventiv – We reward curiosity and embrace bold ideas.
• Transformativ – We support your growth with training, mentorship, and flexibility.
• Collaborativ – We operate across coasts, connected by purpose and teamwork.

Cognitiv is proud to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive workplace for all.

Note on AI Use: Cognitiv may use AI technology to assist with certain administrative aspects of the hiring process, such as note-taking, interview documentation, and reporting. However, every resume and application is reviewed directly by our recruiting team. AI tools are used solely for operational support and do not influence candidate evaluation or hiring decisions.