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About the Role

As a Senior Fullstack Engineer on the AI Agent Testing team, you will be a key technical contributor shaping the systems, tooling, and workflows that power AI agent evaluation at scale. This role leans more on backend development, focusing on APIs, event-driven systems, testing infrastructure, data workflows, and platform thinking, with the ability to deliver user-facing tools. You will collaborate with cross-functional teams to build internal and customer-facing capabilities that improve AI agent quality, influencing technical direction and engineering standards.

Responsibilities

Shape the systems, tooling, and workflows that power AI agent evaluation at scale.
Design and deliver polished user-facing tools.
Collaborate with product managers, designers, data engineers, applied AI/ML partners, and fellow engineers.
Build internal and customer-facing capabilities that improve the quality of AI agents.
Ship features end-to-end.
Help shape technical direction.
Raise the bar on engineering quality.
Influence how the team solves complex problems.
Contribute to the reliability, scalability, and observability of the systems the team owns.
Mentor and support other engineers through code reviews, design discussions, and day-to-day collaboration.
Drive work forward, surfacing risks early, and helping the team execute with confidence.

Requirements

5+ years of experience building modern web applications using TypeScript, React, and Node.js.
Strong experience designing and building backend services, APIs, and event-driven systems.
Strong understanding of software engineering best practices, including clean architecture, testing strategy, observability, and maintainability.
Experience working across the stack and delivering polished, performant, accessible user experiences.
Ability to independently drive complex projects from ambiguity to execution, while partnering effectively across functions.
Excellent communication skills, proactive mindset and the ability to influence technical decisions, align stakeholders, and mentor other engineers.
Product-minded engineer with a focus on end-user experience and proactive contribution of ideas.
Comfort working in fast-moving, cross-functional environments and iterating based on feedback.
Drive for continuous learning, reflection, and improvement.
Eagerness to expand into ML engineering and learn how it connects to evaluation, testing, and the lifecycle of AI systems.

Skills

TypeScript
React
Node.js
Backend services
APIs
Event-driven systems
Clean architecture
Testing strategy
Observability
Maintainability
User experience
Communication
AWS
CI/CD pipelines
Microservice architecture
Relational data modeling
NoSQL data modeling
Python
AI agentic tools
Cursor
Claude Code
Evaluation systems
Synthetic testing pipelines
AI quality tooling

Location

Remote

Work Type

Hybrid

Experience Level

Senior

About the Company

Zendesk software was built to bring a sense of calm to the chaotic world of customer service.
Zendesk powers billions of conversations with brands.
Zendesk believes in offering its people a fulfilling and inclusive experience.
Zendesk offers a hybrid way of working, enabling purposeful in-person connection and collaboration, alongside flexibility for remote work.

Equal Opportunity

As part of our commitment to fairness and transparency, we inform all applicants that artificial intelligence (AI) or automated decision systems may be used to screen or evaluate applications for this position, in accordance with Company guidelines and applicable law.
Zendesk is an equal opportunity employer, and we’re proud of our ongoing efforts to foster global diversity, equity, & inclusion in the workplace.
Individuals seeking employment and employees at Zendesk are considered without regard to race, color, religion, national origin, age, sex, gender, gender identity, gender expression, sexual orientation, marital status, medical condition, ancestry, disability, military or veteran status, or any other characteristic protected by applicable law.
We are an AA/EEO/Veterans/Disabled employer.
If you are based in the United States and would like more information about your EEO rights under the law, please click here.
Zendesk endeavors to make reasonable accommodations for applicants with disabilities and disabled veterans pursuant to applicable federal and state law.
If you are an individual with a disability and require a reasonable accommodation to submit this application, complete any pre-employment testing, or otherwise participate in the employee selection process, please send an e-mail to peopleandplaces@zendesk.com with your specific accommodation request.