Integrations Engineer

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.

About StackOne

StackOne is the AI Integration Gateway powering the next generation of SaaS and AI Agents. Backed by GV, Workday Ventures, and angels/advisors from DeepMind, OpenAI, GitHub & Mistral, we’ve raised $24M to enable developers to orchestrate thousands of secure, scalable, and accurate actions in AI Agents.

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.

About the Role

StackOne is growing fast, and at the core of our platform is the Unified API & Integration Engine that powers our developer experience and the actions agents rely on. We’re hiring Integrations Engineers to help us build and scale that foundation.

You’ll work across our integration engine, collaborating with the team to design and implement high-quality, reliable, and developer-friendly APIs & AI Actions that map across hundreds of third-party systems.

This role is ideal if you care about API ergonomics, integrations & developer experience, and the underlying systems that make integrations robust and secure. You’ll work closely with product, infra, and AI teams - this is a pivotal role in shaping how we connect the world’s software to Agents.

Responsibilities

• Develop internal tooling and abstractions to help us ingest, normalize, and unify third-party APIs across domains like HR, CRM, ERP, LMS, and more

• Write clean, testable code and perform thoughtful code reviews with a focus on maintainability and performance

• Help improve and enforce standards for data modeling, authentication, retries, pagination, and observability

• Collaborate cross-functionally with product and AI teams to shape how actions are surfaced and called by agents

• Stay current on integration patterns, API trends, and new tools, then bring those insights into how we build

What We’re Looking For

• 2+ years of experience building Integrations and interacting with APIs

• Experience working with OAuth, webhook systems, or complex auth flows

• Proficient at using terminals and CLIs

• Practical knowledge of TypeScript & Node.js

• Clear communicator with a collaborative mindset

• Exposure to Docker, testing frameworks, and modern deployment practices

Our Stack

You will have a lot of freedom and agency to choose and work with the technologies you love. Our tech stack includes:

• Infra & Monitoring: AWS (ECS, RDS, ElastiCache, Lambda), Cloudflare, Tinybird, Modal, Dagster, Langsmith, Datadog, Sentry, Incident.io

• Languages & Frameworks: TypeScript (Node.js), Python, NestJS, React, Svelte

• Other day-to-day Tools: Postman, Notion, Slack, Jira, GitHub

Benefits

• 18 days holiday

• Private health insurance

• Annual offsite

• Office space

🚀 Ready to help us change the game for Agentic integrations?

Apply now and let’s build the future of interoperability together.

We believe diversity drives innovation. We encourage individuals from all backgrounds to apply. As an equal opportunity employer, we celebrate diversity and are committed to creating an inclusive environment for all employees.