Senior Python Backend Engineer — AI Agents & LangGraph

Pixie Services; Málaga; Hybrid; EUR 83,000 - 124,000; Full time

Job summary

Pixie Services in Málaga, Spain is seeking a Senior Back-End Developer (Python) for a freelance project focused on AI agents, LangGraph and MCP connectors. You will define and validate technical specifications and contribute to architectural decisions.

The role requires autonomous work, strong Python backend skills, and experience with tool calling, SDD and execution engines. Hybrid work arrangement offered.

Qualifications

• Strong experience in Python back-end development.
• Knowledge of Specification-Driven Development (SDD).
• Experience with AI agents and tool calling.
• Knowledge of LangGraph.
• Ability to work autonomously and exercise independent technical judgment.
• Experience reviewing code, specifications and acceptance criteria.

Responsibilities

• Python back-end development.
• AI agents and agent-based workflows.
• LangGraph.
• Tool calling.
• MCP connectors.
• Specification-Driven Development (SDD).
• Execution engines.
• Technical specifications and acceptance criteria.
• Code reviews and design validation.
• Technical decision-making and architectural alignment.

Skills

Python back-end development

AI agents

LangGraph

Tool calling

MCP connectors

Specification-Driven Development (SDD)

Execution engines

Technical specs & acceptance criteria

Code reviews

Architectural decisions

Tools

LangGraph

MCP connectors

Tool calling

Job description

Pixie Services in Málaga, Spain is seeking a Senior Back-End Developer (Python) for a freelance project focused on AI agents, LangGraph and MCP connectors. You will define and validate technical specifications and contribute to architectural decisions.

The role requires autonomous work, strong Python backend skills, and experience with tool calling, SDD and execution engines. Hybrid work arrangement offered.