At Oesia Group, we are growing We would like to count on you for our next job offer:
We are looking fora Senior AI Software Engineer to join an important Project located in Madrid in Hybrid job modality.
What are we looking for? An/a Senior AI Software Engineer , with at least 4years of experience.
Availability to join a stable project in Madrid.
Work Model: Hybrid
Work Schedule: Complete
Requirements: 2-4 years of experience in software development and AI.
Hands-on experience with LLMs and token cost optimization.
Experience with LLM APIs, structured prompting, tool use, and context management.
Proficiency in Python and experience with Java and/or Angular .
Knowledge of Git, pull requests, and CI/CD practices.
Experience designing and executing E2E and smoke tests.
What will your responsibilities be? Develop AI-driven software solutions.
Design and implement Spec-Driven Development ( SDD) architectures.
Build and orchestrate multi-agent systems.
Integrate and optimize Large Language Models (LLMs) .
Develop solutions using LLM APIs, prompting, and tool integrations.




Ensure software quality through E2E and smoke testing .
Collaborate on the continuous improvement of development processes and solutions.
What we offer you? Work in a multinational company recognized as one of the best companies to work for in 2025, according to Actualidad Económica and Forbes.
Stable and innovative technological projects for leading national and international clients.
Career plan: we offer an attractive professional career based on experience and personal potential within a continuously evolving company with solid growth.
Free access to various training platforms, providing you with a wide multidisciplinary catalog.
Versátil compensation.
An equal, diverse company with great Corporate Social Responsibility.
A positive, healthy, and cooperative work environment. Teamwork is the cornerstone of the company's project successes.
Have you heard of us? With over 3.800 professionals in 20 corpo

📌 Senior AI Software Engineer (Madrid)
🏢 Oesía Group
📍 Madrid