Job Description

At Zendesk, we’re on a mission to build the most advanced AI agents in CX, and the Testing team , part of AI Agents Advanced , is focused on ensuring the quality and reliability of our AI agents through synthetic testing, evaluation frameworks, and other validation approaches that help us ship with confidence.

As a Fullstack Engineer on this team, you’ll be instrumental in building the systems and tools that power synthetic testing, evaluation, and quality validation for our AI agents. While this is a fullstack role, it leans more on backend development, we’re looking for someone who is passionate about APIs, event-driven systems, testing infrastructure, and data workflows, while also being comfortable crafting user-facing tools and owning delivery end-to-end.

You’ll work closely with product managers, designers, data engineers, data analysts, and fellow developers to create seamless, intuitive experiences — combining rich data, intelligent systems, and responsive UIs.

Your work will directly shape how our customers make informed and impactful decisions based on real-time, AI-powered insights.

What You Bring to the Role

3+ years of experience building modern web applications using TypeScript , React , and Node.js .
Familiarity with REST APIs, data fetching strategies, and integrating with external services.
You write clean, modular, and tested code — and you value maintainability as much as speed .
Experience working with design systems and component libraries , with a strong focus on performance, accessibility, and usability.
You are a product-minded engineer — you care deeply about the end-user experience and proactively contribute ideas to improve product outcomes.
Excellent communication skills and a proactive mindset — you collaborate well in cross-functional teams, aren’t afraid to ask for help, and enjoy enabling others.
A drive for continuous learning, reflection, and improvement — in both your own growth and your team’s success.

A big plus if you

Are familiar with AWS, and comfortable with CI/CD pipelines.
Have a good understanding of microservice architecture and event-driven systems and basic database design (relational and NoSQL).
Have experience using AI agentic tools such as Cursor, Claude Code, and similar developer assistants
Have working knowledge of Python and experience using it in backend, automation, or data-related tasks.

How We Measure Success in This Role

You consistently deliver well-scoped, high-quality features across the stack, with guidance from senior team members when needed.
You contribute to the reliability, maintainability, and performance of our systems through clean code, thoughtful testing, and attention to detail.
You collaborate effectively across disciplines (product, design, AI/ML, data) and actively participate in team discussions and planning.
You demonstrate ownership by following through on tasks, communicating blockers, and proactively seeking feedback to improve your work.
You show growth over time — deepening your technical skills, increasing your product understanding, and contributing more independently.

Our Tech Stack

Frontend : TypeScript, React
Backend : Node.js (ES7+), TypeScript, Python, MongoDB, Snowflake
Infrastructure : AWS, Kubernetes, Terraform, ArgoCD, Sentry, Redis, Datadog, GitHub Actions

Interview Process

We aim to make our hiring process clear and transparent:

Intro chat with Talent Partner – up to 30 minutes
Interview with Hiring Manager – 30-45 minutes
Technical stage is a live coding challenge and interview with two engineers – 90 minutes
Final interview with Hiring Manager and Senior Leadership –45 minutes

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Software Engineer II

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