Full Stack AI Engineer

A growing RegTech SaaS business is hiring a Senior Full-Stack Engineer to help build the next generation of its customer-facing platform from its Cascais engineering hub.

The company is developing an AI assistant that will sit inside a highly configurable regulatory platform. Over time, the assistant will help customers create complex workflows through conversation, interpret regulatory changes, work across documents and data, and interact with underlying product capabilities.

This hire will have significant influence over how that agent layer is designed, shipped and operated in production.

The role

You will work across the core product and the AI agent layer, taking ownership of features from design through to production.

The work will include:

Building and operating multi-step AI agent workflows

Designing tool and function calling between agents and product services

Managing state, context, retries, fallbacks and human intervention

Building evaluation and regression approaches for non-deterministic AI behaviour

Implementing tracing and observability across agent workflows

Managing latency, token usage and model cost in production

Designing guardrails around agent behaviour and actions

Building full-stack product features across backend and frontend services

Working with APIs, databases and cloud infrastructure

Contributing to architecture and technical design decisions

Owning what you build after release and improving it based on real production behaviour

What we're looking for

You'll need strong commercial software engineering experience and hands-on experience taking AI agents into production.

The strongest profiles will be able to explain a real system they personally helped design and build, including what the agent could do, how it interacted with other systems, what happened when parts of the workflow failed, and how its behaviour was evaluated after release.

Experience with some of the following will be useful:

C# and .NET

Python

React, Angular or another modern frontend framework

Semantic Kernel, Azure AI Foundry, LangGraph, Pydantic AI or similar agent frameworks

RAG and retrieval pipelines

REST APIs and SQL databases

AI evaluation, tracing and observability tooling

CI/CD and automated testing

Experience across several production AI projects would be particularly relevant.

You'll also suit the environment if you're comfortable working in a smaller engineering team where technology is changing quickly, technical decisions are visible and engineers are expected to challenge assumptions, learn quickly and take ownership.

What's on offer

Salary up to

€100,000 , depending on experience

Hybrid working from Cascais, typically around two days per week in the office

Private medical insurance

Access to AI tooling and professional development

Opportunity to have significant influence over a new production AI capability as the engineering team grows

You must already have the right to work in Portugal. Visa sponsorship is not available.

#J-18808-Ljbffr