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 25000 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.

Role overview

Join a tight-knit fast-paced team of AI engineers pushing MCP to its limits and advancing the protocol across the ecosystem. You will build into the best way to integrate agents with SaaS apps make MCP enterprise-ready through StackOne and stay tightly aligned with the MCP community to adopt and influence the latest standards.

Key Responsibilities

• Design build and operate MCP servers transports and tools that connect agents to SaaS apps via StackOne and ()

• Productionise MCP for the enterprise: authn/authz multi-tenancy RBAC audit logs observability SLIs and SLAs

• Ship on Cloudflare and AWS: Workers Durable Objects KV R2 plus Lambda or containers API Gateway IAM and networking

• Define conformance load and chaos tests for MCP servers to harden reliability and performance

• Coordinate with the MCP ecosystem: track proposals contribute issues and PRs write design notes and interop guides

• Translate real customer CUJs into protocol and product improvements in and StackOne

Requirements & Qualifications

Must have

• 3 years professional full-stack experience shipping production systems

• Hands-on experience building MCP servers or equivalent agent tool servers including permissions and session management

• Strong Cloudflare experience: Workers Durable Objects KV or R2 build and deploy pipelines

• Strong AWS experience: one of Lambda ECS or EKS plus API Gateway IAM VPC networking and monitoring

• Proficiency with TypeScript or and React or Svelte for developer portals and example UIs

• Experience designing agentic workflows: tool schemas function calls guardrails and evaluation

• Solid understanding of HTTP WebSockets or SSE OAuth 2.0 signed requests and webhooks

• Knowledge of other tools calling standards with understanding of their differences and trade-offs

Nice to have

• Contributions to MCP or adjacent open-source projects

• Experience using Claude Code via CLI or SDK

• Experience with multi-tenant architectures policy engines and fine-grained scopes

• Background with security and compliance controls in production environments

• Familiarity with GenAI evaluation tool-calling patterns and safety rails

Tech Stack

TypeScript React Cloudflare Workers Durable Objects KV R2 AWS Lambda or containers API Gateway IAM PostgreSQL Redis Webhooks OAuth 2.0 OpenAPI JSON Schema Prometheus-class observability.

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.