Software Development Engineer III - Test

Company at a Glance

OpenX is focused on unleashing the full economic potential of digital media companies. We do this by making digital advertising markets and technologies that are designed to deliver optimal value to publishers and advertisers on every ad served across all screens.

At OpenX, we have built a team that is uniquely experienced in designing and operating high-scale ad marketplaces, and we are constantly on the lookout for thoughtful, creative executors who are as fascinated as we are about finding new ways to apply a blend of market design, technical innovation, operational excellence, and empathetic partner service to the frontiers of digital advertising.

We’re seeking a driven and experienced Software Development Engineer in Test (SDET) with strong full-stack testing expertise to help launch a new product within our platform. You’ll join a talented, remote-first US team and play a key role in delivering self-service tools that simplify and automate complex workflows for media activation.

An ideal candidate is:

Open-minded – Welcomes feedback, learns from failure, and adapts quickly to change.

Proactive – Takes initiative to identify problems and drive thoughtful, effective solutions.

Self-motivated & Organized – Manages priorities independently and follows through with clarity and accountability.

What our team does:

Our team is responsible for delivering a new product within OpenX’s next-generation platform to help users plan, manage, and optimize campaign outcomes more effectively. We focus on building scalable APIs and intuitive interfaces that give users access to our rapidly growing suite of AI-driven decisioning and optimization tools.

• Build and maintain scalable test automation frameworks that ensure reliability across APIs and user interfaces in a 0→1 product environment.
• Develop comprehensive automation strategies to validate AI-driven media activation.
• Own end-to-end validation for key features, driving test strategy, implementation, execution, and deployment readiness.
• Work closely with backend, frontend, and data science teams to align on testability, coverage gaps, and quality goals throughout the development cycle.
• Investigate failures, perform root cause analysis, and continuously improve coverage, test data strategies, and test suite performance.
• Promote engineering excellence through constructive code reviews, mentoring, and driving improvements in code quality, architecture, and platform best practices.

• 5+ years of experience in software test automation, with a strong track record of building and maintaining scalable test frameworks for backend APIs and user-facing applications.
• Proficiency in Python and JavaScript/TypeScript, with the ability to write clean, modular, and testable code
• Hands-on experience with CI/CD tools such as Google Cloud Build, Spinnaker, or equivalent, including maintaining and improving test pipelines.
• Deep understanding of modern testing strategies, including integration, end-to-end, and regression testing in distributed systems.
• Strong debugging and root cause analysis skills, with the ability to triage and resolve issues across complex service and interface boundaries.
• Hands-on experience with modern test frameworks such as pytest, Cypress, Playwright, or Go-based tools
• Familiarity with TestOps and DevOps practices, including test observability, parallel execution, and test data strategy
• Excellent collaboration and communication skills, with a focus on engineering excellence and continuous improvement

• Experience working on SaaS platforms with multi-step workflows, complex data models, or user-facing configuration tools.
• Experience in digital media, marketing technology, or advertising technology
• Experience working in cloud-native environments using Kubernetes, Docker, and CI/CD pipelines. (ask us about our migration to Google Cloud Platform!)
• Experience testing UI flows or frontend systems built with component libraries or GraphQL APIs
• Familiarity with AI-assisted development tools like Cursor and GitHub Copilot.

Pursuant to any state, local ordinance, or local hiring regulations, we will consider for employment any qualified applicant, including those with arrest and conviction records, in a manner consistent with the applicable regulation. 

OpenX is committed to fair and equitable compensation practices. For all applicants, the base salary range is noted above, per year + bonus + equity + benefits. A candidate’s salary is determined by various factors including, but not limited to, relevant work experience, skills, and certifications. 

A summary of our benefits, which include medical, dental, vision, 401k, equity and more, can be viewed here: https://www.openx.com/company/careers/ A candidate’s salary is determined by various factors including, but not limited to, relevant work experience, skills, and certifications.  

OpenX VALUES

Our five company values form a solid bedrock serving to define us as a group and guide the company. Our values remind us that how we do things often matters as much as what we do.

WE ARE ONE

We are one team. There are no exceptions. We are a group of strong and diverse individuals unified by a shared mission. We embrace challenges and win together as a team. We respect and care about our colleagues and cultivate an inclusive culture

WE ARE CUSTOMER CENTRIC

We innovate on behalf of our customers. We understand, respect, and listen carefully to our customers. We build great products to solve our customers’ problems. We manage our customers’ expectations clearly and honestly. We are a trusted partner to all of our customers - we act with integrity at all times. We care.

OPENX IS OURS

We are all owners of OpenX

We all have a voice to improve OpenX

We stake our personal and professional reputations on the excellence of our work

We are not interested in just "doing our jobs"; we take ownership to drive results

WE ARE AN OPEN BOOK

We understand and respect what each of us does. We are eager to teach and share what we know with others, both internally and externally. We are eager to learn from others and we ask questions internally and externally. 

WE EVOLVE FAST

We take responsible risks and own and learn from our mistakes. We recognize and repeat success. We actively seek out and provide constructive feedback. We adapt quickly and embrace change. We tackle growth and learning with real urgency. We are endlessly curious.

OpenX TRAITS

Our three traits capture what makes a great team member at OpenX.

HUMBLE

Ideal team players are humble and demonstrate integrity. They put the team's success above their own, share credit generously, and value collective achievements. They are self-assured, open to coaching, and committed to continuous learning.

DRIVEN

Ideal team players are results-driven and motivated. They are curious, always seeking more to do, learn, and take on. As proactive problem-solvers, they take initiative without needing external motivation. They continuously think about the next steps and opportunities for improvement.

SMART

Ideal team players are smart and possess the intellectual acumen to understand the complexities of our organization and industry. They are interpersonally intelligent, good communicators, and exemplify sound judgment in their interactions across the company to foster a collaborative environment.

OpenX is committed to equal employment opportunities.

It is a fundamental principle at OpenX not to discriminate against employees or applicants for employment on any legally-recognized basis including, but not limited to: age, race, creed, color, religion, national origin, sexual orientation, sex, disability, predisposing genetic characteristics, genetic information, military or veteran status, marital status, gender identity/transgender status, pregnancy, childbirth or related medical condition, and other protected characteristic as established by law.

OpenX Applicant Privacy Policy

Applicants can review our Applicant Privacy Policy at any time by visiting the following link: https://www.openx.com/privacy-center/applicant-privacy-policy/.

Effective Date: November 21, 2024