Backend AI Engineer (.NET/C#)

act digital; Porto; Hybrid; EUR 42,000 - 68,000; Full time

Job summary

act digital is seeking a Backend AI Engineer to design, build and integrate AI capabilities into backend products and services in Porto, Portugal. You will work on scalable services and contribute to AI-powered features across the product stack.

You will design and develop backend services with C# and .NET, train and deploy ML models, integrate LLM and RAG capabilities, and apply MLOps practices. This role is full-time and hybrid, with three days on site in Porto.

Qualifications

• Proven backend development experience with C# and .NET.
• Experience deploying machine learning models to production.
• Familiarity with ML frameworks (PyTorch, TensorFlow or scikit-learn) and AI tooling.

Responsibilities

• Design and develop backend services using C# and .NET.
• Build, train and deploy machine learning models into production.
• Integrate LLM and RAG capabilities into scalable applications.
• Collaborate across engineering, data and product teams.
• Apply MLOps practices to testing, deployment and monitoring.

Skills

C#

.NET

Python

Machine Learning

Tools

Docker

Kubernetes

PyTorch

TensorFlow

scikit-learn

Job description

We are seeking a Backend AI Engineer to build and integrate AI capabilities into backend products and services.

Responsibilities

• Design and develop backend services using C# and .NET.
• Build, train and deploy machine learning models into production.
• Integrate LLM and RAG capabilities into scalable applications.
• Collaborate across engineering, data and product teams.
• Apply MLOps practices to testing, deployment and monitoring.

Requirements

• Strong C# and .NET backend development experience.
• Experience building or deploying machine learning models.
• Python and frameworks such as PyTorch, TensorFlow or scikit-learn.
• Knowledge of LLMs, RAG, cloud platforms and MLOps.
• Experience with Docker and Kubernetes.

Full-time, hybrid in Porto, Portugal, with three days per week on site.