Senior Full-Stack Engineer (Frontend Focus)

Onsite - San Francisco

$200,000 USD + Equity & Benefits

About TestBox

TestBox was founded with a bold mission : to fundamentally transform how software is bought and sold. We're building an innovative platform that empowers buyers with transparent, interactive software experiences, while equipping sellers with powerful tools to deliver exceptional buying and onboarding journeys. Our core technologies - synthetic data, intelligent orchestration, and our unique product graph - help teams achieve faster implementations, clearer insights, and increase trust with their customers.

At TestBox, we're not just improving demos; we're building the next generation infrastructure for software transactions, creating seamless experiences from initial interest to successful onboarding and beyond.

We're a fast-growing startup built by a team that values experimentation, velocity, and customer impact. We're backed by world-class investors and are building a platform that's disrupting the traditional B2B sales motion.

Role Overview

We are hiring a Senior Full-Stack Engineer with a strong Frontend focus to build the user-facing interfaces for our next-generation platform. This is a unique opportunity to own the creation of sophisticated, interactive tools that will be the primary authoring environment for our most technical users.

You will be responsible for translating complex backend capabilities into intuitive and powerful user experiences. The core challenge is to build rich, data-intensive applications that allow users to manage complex data and automate intricate workflows, making difficult tasks feel simple and elegant. While your primary focus and expertise will be on the frontend, you will be comfortable diving into our Python / Django backend to build the APIs needed to bring your UIs to life.

What You'll Do

• Build the rich, interactive user interfaces for our platform's core authoring tools, including tools for visual workflow creation and data management and visualization.
• Design, build, and modify API endpoints in our Django backend to support new user interfaces and ensure seamless data flow.
• Partner closely with product design to iterate on prototypes and deliver polished, high-quality user experiences.
• Establish the foundation for our frontend architecture, including our component library, state management strategy, and testing best practices.
• Collaborate with backend engineers on the Platform team to define and integrate with core platform services.

Who You Are

Preferred Experience

Why Join TestBox

Benefits