ronan barrell.
About

Applied AI Engineer

Hi, I'm Ronan Barrell. I design, build and deploy production AI systems — LLM apps, agentic workflows, RAG and integrations.

I'm an Applied AI Engineer with 15+ months of commercial experience shipping production AI systems for SME clients. I own projects end to end — from requirements and architecture through backend, testing, frontend integration and Azure deployment.

My focus is LLM applications, agentic workflows, tool calling, RAG, hybrid retrieval, structured outputs and evaluation. I build in Python and FastAPI, wire in third-party APIs like Microsoft Graph and OAuth 2.0 providers, and back everything with tests and evaluation scenarios.

Alongside client work I run NexusForge 3D, a small 3D-printing business, and I build ambitious personal projects — a grounded financial analytics assistant and a guardrailed multi-agent cognition sandbox — to keep pushing the edge of what applied AI can do.

Capabilities

Skills & technologies

The tools and disciplines I use to build and ship AI products.

AI Engineering

  • LLM applications
  • Agentic workflows
  • Tool calling
  • RAG
  • Embeddings
  • Reranking
  • Structured outputs
  • Vector search
  • Evaluation frameworks

Backend

  • Python
  • FastAPI
  • Pydantic
  • HTTPX
  • Async Python
  • REST APIs
  • SSE
  • Webhooks

Data & Integrations

  • Azure SQL
  • SQL
  • Microsoft Graph
  • OAuth 2.0
  • Clerk
  • Multi-tenant systems

Cloud & Delivery

  • Azure App Service
  • GitHub Actions
  • CI/CD
  • Testing
  • Secret management
  • TypeScript
  • React
Experience

Where I've worked

A track record of shipping AI systems in research and industry.

Applied AI Engineer

Projekt Rising

Designed, built and deployed production AI systems for SME clients — LLM applications, agentic workflows, RAG, automation pipelines and third-party integrations. Owned projects end to end from requirements and architecture through backend development, testing, frontend integration and Azure deployment.

April 2025 — July 2026

Founder

NexusForge 3D

Founded and operated a small 3D-printing business focused on custom hobby and prototyping products. Managed product design, production, customer requirements and online sales.

April 2024 — May 2026
Education

Training & qualifications

Formal study alongside continuous hands-on learning.

T Level in Digital Production, Design and Development

Stamford College · 2024 — 2026

Software development, databases, testing, cybersecurity and delivery. Predicted Distinction.