Backend / AI Developer - Freelancer

Monterail; Polska; Hybrid; PLN 120,000 - 190,000; Full time

Job summary

Monterail is building an AI Transformation platform for an enterprise client, focused on back-office process automation and AI-driven decision support. You will integrate data from multiple sources, build AI agents, and develop MCP servers to expose data to agents and tools.

You will also work on ETL, data synchronization, and the agent platform architecture, while designing backend APIs and user-facing data-driven tools. Strong Python experience and English communication are essential.

Qualifications

• 2 years of backend development experience in Python.
• Hands-on with FastAPI or a modern web framework.
• Solid PostgreSQL knowledge: schema design and optimization.
• Experience building and consuming REST APIs.
• Understanding ETL and data synchronization concepts.
• Proficient with Docker and Docker Compose.
• Practical experience with LLMs and prompt writing.
• Comfort with agentic AI tools in daily development.
• Ability to write clear technical documentation.
• Good English for client communication (B2+).

Responsibilities

• Integrate data from multiple sources into a unified data layer.
• Build and deploy AI agents that automate tasks like signal analysis and data tagging.
• Develop MCP servers to expose data to agents and tools.
• Perform data engineering: schema design, ETL, data quality.
• Contribute to the agent platform architecture and telemetry for LLM calls.
• Design and build backend APIs connecting data with agents and frontend apps.
• Create user-facing tools driven by data and insights.
• Maintain infrastructure: containers, databases, monitoring, observability.
• Document architectural decisions and system contracts.

Skills

Python

FastAPI

PostgreSQL

REST APIs

Docker

Docker Compose

LLMs & prompts

Agent-based systems

Documentation

English communication

Tools

Docker

Docker Compose

Job description

About the Project

We're building an AI Transformation platform for an enterprise client, focused on back-office process automation and AI-driven decision support. The platform brings together data from multiple business systems and puts AI agents on top of it, so that business teams get actionable insights and automated workflows instead of manual routines.

What You'll Do

• Integrate data from multiple business sources (CRM, analytics, BI) into a single, cohesive data layer
• Build and deploy AI agents that execute specific business tasks: signal analysis, pricing, content/SEO, data classification and tagging
• Develop MCP (Model Context Protocol) servers: dedicated, read-only, domain-specific servers that expose data to agents and tools
• Do data engineering work: schema design, ETL and synchronization from external systems, and ensuring data quality and consistency
• Contribute to the agent platform architecture: routing layer, cost control, access policies, and telemetry for LLM calls
• Design and build backend APIs connecting the data layer with agents and front-end applications
• Create user-facing tools for business teams, driven by data and agent-generated insights
• Maintain infrastructure: containerization, database management, monitoring, and observability
• Document architectural decisions and keep strict contracts between system layers

Tech Stack

Python · FastAPI · Agno (agent framework) · MCP · PostgreSQL · Docker / Docker Compose · Next.js

What we are looking for:

• Solid commercial experience (approx. 2 years) in backend development with Python
• Hands‑on experience with FastAPI or a comparable modern web framework
• Good knowledge of PostgreSQL: schema design, query writing, and optimization
• Experience building and consuming REST APIs
• Understanding of ETL and data synchronization concepts, and of how to keep data consistent across systems
• Working knowledge of Docker and Docker Compose
• Practical experience with LLMs and prompt writing; interest in building agent‑based systems
• Comfort working with agentic AI tools (e.g., Claude Code) in daily development, and the discipline to critically verify their output
• Ability to write clear technical documentation
• Good communication skills and confidence working directly with client‑side teams
• English level sufficient for daily communication with the client (B2+ / Upper‑Intermediate)

Nice to Have

• Experience with agent frameworks (Agno, LangChain, LlamaIndex, or similar)
• Familiarity with MCP (Model Context Protocol)
• Basic Next.js / React skills for working on front-end applications
• Experience with observability and monitoring tools
• Experience integrating with CRM, analytics, or BI systems
• Background in enterprise or consulting projects

What do we mean by freelance?

• Read more at Monterail Tech Network