MCP Engineer
MCP Engineer
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Job Description
About StackOne
StackOne is the universal integration layer for modern SaaS products. Weve raised $24m in 2 years and were backed by top tier investors like Google Ventures and Workday Ventures.
Our unified API platform lets vendors ship hundreds of native white label integrations in days not months by abstracting away dozens of disparate third party APIs into a single normalized interface. On top of those APIs we provide AI Agent Actions so customers can build agentic workflows without wrangling OpenAPI specs.
StackOne sits behind the scenes as an embedded iPaaS: SOC 2 compliant multi-tenant and invisible to end users powering integrations for future-of-work SaaS categories such as HR Compliance and AI Agents.
Our customers are established B2B SaaS companies that:
Sell to mid market and enterprise buyers
Are building AI Agents in the near future
Need deep native integrations to win competitive deals and power their product
Value time to integration over building connectors in house
We typically close OEM and embedded licensing deals multi-year (1 to 3 year) contracts five to seven figure TCV with a strong land and expand model. Key buyer personas are the CPO and CTO.
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.
Employment Type
Full-Time
