Backend / AI Developer - Freelancer at Monterail

Monterail

Kraków

On-site

PLN 165,000 - 303,000

Full time

3 days ago

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Job summary

Monterail in Kraków is seeking a Backend / AI Developer (Freelancer) to join on-site. You will work across data integration, AI agents, and backend services to deliver scalable solutions.

You will build MCP servers, handle ETL, and contribute to the agent platform, APIs, observability, and documentation. Strong English communication is required to collaborate with clients.

Qualifications

Solid commercial experience in backend development with Python (about 2 years).
Hands-on experience with FastAPI or a comparable modern web framework.

Responsibilities

Integrate data from multiple business sources into a single data layer.
Build and deploy AI agents that perform business tasks: signal analysis, pricing, content/SEO, data classification and tagging.
Develop MCP servers: dedicated read-only domain-specific data servers exposing data to agents/tools.
Perform data engineering: schema design, ETL, and synchronization while ensuring data quality.
Contribute to the agent platform architecture: routing, cost control, access policies, telemetry for LLM calls.
Design and build backend APIs connecting data with agents and front-end apps.
Create user-facing tools driven by data and insights from agents.
Maintain infrastructure: containerization, databases, monitoring, observability.
Document architectural decisions and maintain clear contracts between system layers.

Skills

Python

FastAPI

LLMs

Agent-based systems

API design

Data integration

Cloud/DevOps basics

Documentation

English communication

Tools

Docker

Docker Compose

PostgreSQL

Next.js

Agno

MCP

Job description

Apply for Backend / AI Developer - Freelancer at Monterail in Kraków, ML, PL. This Full time on site position offers great opportunities for career growth.

Requirements 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