About StackOne:
StackOne is the AI Integration Gateway for SaaS products and AI Agents. Backed by GV and Workday Ventures ($24M raised), we help builders of SaaS platforms and AI Agents orchestrate hundreds of scalable, accurate, and enterprise-grade integrations. Our platform combines 25,000 pre-mapped actions on 200 connectors, an AI-powered integration development toolkit, plus security by design: a real-time architecture, managed authentication and permissions, and end-to-end observability.
Join us on our fast trajectory to build the future of agentic integrations.
With an
AI-native integration toolkit that delivers real-time execution, managed authentication, granular permissions, and full observability, all built with safety at its core, we’re now doubling down on
AI R&D & creating our own lab to push the boundaries of
tool calling for agents: training
specialized LLMs designed to outperform general-purpose models in what matters most:
precision, reliability, and safety in agentic execution.
About The Role
We’re looking for full-stack engineers who can ship fast, think in systems, and obsess over scalability, performance & usability. You’ll build core APIs, scale infra, and ship dev tools & UIs that makes tool execution easy, safe and predictable.
It’s a broad role: backend-heavy, product-aware, and deeply technical. Expect to work across APIs, auth, infra, and frontend, building the foundation that lets agents take real action.
Responsibilities
- Act as a full-stack web application engineering: ideate, build, and ship features across frontend, backend, data, and infrastructure.
- Model data & schemas across SQL, document/columnar stores, and OLAP; design for correctness, performance, and cost.
- Design and evolve public APIs and standards: REST contracts, OpenAPI, pagination, auth, error models, plus MCP/tool-calling conventions.