MCP Engineer, AI Backend Engineer

Ruby Labs

MCP Engineer / AI Backend Engineer developing MCP infrastructure and AI-powered backend services for Ruby Labs. Collaborating with internal teams to build reliable and scalable systems.

Posted 5/25/2026full-timeRemote • 🇪🇺 Anywhere in EuropeMid-LevelSeniorWebsite

Tech Stack

Tools & technologies

JavaScriptNext.jsNode.jsTypeScript

About the role

Key responsibilities & impact

Design, build, and maintain MCP servers and MCP-based integrations
Implement MCP tools, resources, prompts, and backend interfaces
Build reliable communication between AI agents, tools, and backend systems
Define clean contracts for MCP tools and services
Improve the stability, predictability, and maintainability of MCP infrastructure
Test MCP tool behavior across different usage scenarios
Monitor and improve the quality of AI-tool interactions
Build and maintain backend services using TypeScript and Node.js
Work with backend frameworks such as Hono, Fastify, NestJS, and Next.js backend/API routes
Implement REST APIs, internal endpoints, service-to-service integrations, and automation flows
Work with authentication, request validation, error handling, logging, and observability
Design clean, maintainable backend architecture for internal and production-facing systems
Write production-quality code with clear structure and good error handling
Build and deploy backend services on Cloudflare Workers
Work with edge runtime limitations and best practices
Design lightweight, performant services for edge/serverless environments
Debug issues related to worker execution, routing, request handling, and deployment
Use Cloudflare services when needed, such as KV, Durable Objects, Queues, R2, or D1
Optimize backend services for performance, reliability, and cost efficiency
Build AI-powered workflows and internal automation tools
Design prompts, system instructions, and tool definitions for reliable AI behavior
Improve the quality, consistency, and predictability of AI outputs
Analyze AI workflow failures and improve prompts, context, or tool contracts
Structure data and context for better LLM performance
Build testable AI workflows that can be evaluated and improved over time
Work with LLM APIs such as OpenAI, Anthropic, Claude, or similar providers
Build integrations between internal systems, APIs, and AI tools
Automate repetitive operational or engineering workflows
Design backend flows that connect AI agents with real business systems
Ensure integrations are secure, observable, and maintainable
Build internal utilities and developer tools when needed
Investigate and fix issues across MCP servers, backend services, Cloudflare Workers, AI workflows, and API integrations
Improve logging, monitoring, and observability for AI/backend systems
Identify root causes of unreliable tool behavior or incorrect AI outputs
Make systems easier to debug, test, and maintain
Document technical decisions and implementation details clearly

Requirements

What you’ll need

Strong experience with TypeScript
Strong experience with Node.js
Experience building backend services or APIs
Experience with at least one backend framework, such as Hono, Fastify, NestJS, or Next.js backend/API routes
Experience with Cloudflare Workers or similar serverless/edge environments
Good understanding of REST APIs, JSON, authentication flows, logging, and error handling
Experience building integrations between services and APIs
Interest in AI tools, LLMs, and automation
Experience with prompt engineering or AI workflow design
Ability to write clean, maintainable, production-quality code
Strong debugging skills
High ownership mindset and ability to work independently

Benefits

Comp & perks

100% remote work
High trust and ownership
Direct impact on AI, automation, and internal engineering workflows
Opportunity to work with modern AI tooling and MCP-based infrastructure
Exposure to real-world backend systems and production workflows
Competitive compensation based on experience
Company-provided MacBook if needed
Unlimited PTO focused on outcomes, not hours

ATS Keywords

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Hard Skills & Tools

TypeScriptNode.jsREST APIsHonoFastifyNestJSNext.jsCloudflare WorkersJSONprompt engineering

Soft Skills

strong debugging skillshigh ownership mindsetability to work independently