Senior Python Engineer — MCP Protocol & Tool Integration

Quick Facts

• Role: Senior Python Engineer (MCP Protocol & Tool Integration)

• Focus: Implement MCP protocol servers/clients and build LLM agent tool integrations

Description

Senior Python Engineer role focused on implementing MCP protocol servers/clients and building agent tool integrations for LLM agents. You will design async HTTP/streaming communication, implement tool schema/function calling with validation, and register MCP tool targets (e.g., Lambda-as-tool, OpenAPI-to-MCP). You will also help standardize integration patterns and support AWS AgentCore Gateway target registration.

Responsibilities

• Implement MCP protocol servers and clients, including tools/list and tools/call handling
• Design and maintain agent tool integrations using function calling, tool schema definition, and parameter validation
• Build and register MCP target types such as Lambda functions as tools, remote MCP servers, and OpenAPI-to-MCP translation
• Develop async HTTP services and streaming responses for MCP server/client communication
• Manage tool metadata, including schema registration, capability tagging, and versioning
• Handle capability negotiation and Streamable HTTP transport within the MCP protocol
• Collaborate with engineering teams to standardize agent tool integration patterns across the platform
• Support AWS AgentCore Gateway target registration for agent tool connectivity

Requirements

• 5+ years of Python engineering experience with agent/AI systems
• Hands-on experience implementing MCP servers or clients in production (tools/list and tools/call handling), including AWS AgentCore Gateway target registration or Lambda-as-tool / OpenAPI-to-MCP translation
• Experience building tool integrations for LLM agents (e.g., OpenAI functions, LangChain tools, or equivalent)
• Proficiency in Python async programming, async HTTP services, and streaming protocols
• Expertise in AWS Lambda development
• Understanding of agent tool integration patterns, including function calling, tool schema definition, and parameter validation

Benefits

• Stable pay
• Employee Stock Purchase Plan with a 15% discount
• Benefits package: health insurance, multisport, shopping vouchers
• Referral bonuses up to $2,000
• Hybrid-by-design with opportunity to work remotely within Poland
• Chance to work abroad for up to 60 days annually
• Career development programs, mentoring, and soft skills/well-being programs
• Certification support (Anthropic, Gemini, GCP, Azure, AWS)
• English classes
• Corporate, social, and well-being events; office amenities
• Contractor option (B2B) with individually agreed terms
• Benefits are available to employees only