Python Developer (Backend) Lisboa

Python Developer (Backend)
Lisboa
Lisboa, Lisboa, Portugal

About e
Xalt-Fi

Founded in 2018, e
Xalt-Fi is a consulting firm built on intrapreneurship, agility, and innovation. With over 1, 300 collaborators, we specialize in Digital Transformation, Financial Services, Product & Project Management, and Technology (development, cloud, data, infrastructure, cybersecurity).

Since 2025, our Lisbon and Porto offices support major international clients, delivering impactful IT and business solutions within a global environment.

About the Client

We are partnering with a global AI-driven technology department that builds scalable applications powered by proprietary machine learning models. With a strong engineering culture, the team focuses on backend development, APIs, and efficient system design, ensuring
- world impact across thousands of users worldwide.

The engineering teams are distributed across Portugal (Lisbon & Porto), Paris, and the UK, with Portugal serving as a key hub of growth.

The Role

We are looking for 2 experienced Python Developers to join the AI engineering team in Lisbon.

This is an opportunity to work on scalable,
- ready AI applications, contributing directly to
- visibility use cases and expanding a
- growing global user base.

The focus is backend development (not data science), building robust APIs and services that run on top of proprietary AI models.

Your Responsibilities

• Design and develop scalable backend applications using Python.
• Build and optimize APIs and services for
  - volume, synchronous workloads.
• Work on code efficiency, data structures, and memory optimization.
• Collaborate with engineers in Portugal, the UK, and Paris on AI product delivery.
• Contribute to
  - ready AI applications used by hundreds of thousands of users globally.

What We Value

• Strong Python programming skills with a focus on software engineering (not just scripting).
• Experience with APIs, concurrency, and scalable architectures.
• Knowledge of data pipelines and backend performance optimization.
• Interest in AI applications, infrastructure, and
  - world use cases.
• Collaborative mindset with the ability to work in a hybrid/remote setup.

Hiring Process

• Online technical test – initial filter.
• Technical interview – deep dive on programming and system design.
• Project interview – practical
  - solving.

Location & Work Setup

• Lisbon-based (2 open roles).
• Hybrid model (50% office / 50% remote) starting next year.

This is a unique opportunity for skilled Python developers to apply their backend expertise to
- edge AI applications, working in an international environment with real business impact.