Overview We are looking to fill this role immediately and are reviewing applications daily. We are a European deep-tech leader in quantum and AI, backed by major general strategic investors and strong EU support. Our groundbreaking technology is already transforming how AI is deployed worldwide — compressing large language models by up to 95% without losing accuracy and cutting inference costs by 50–80%.

Joining us means working on cutting-edge solutions that make AI faster, greener, and more accessible — and being part of a company often described as a "quantum-AI unicorn in the making." Two unique bonuses: signing bonus at incorporation and retention bonus at contract completion. Relocation package (if applicable). Fixed-term contract ending in June 2026.

Hybrid role and flexible working hours. Tasks and responsibilities include the following for a Product Support Engineer on a temporary basis (contract) to provide customer-facing technical support for our compressed Large Language Models (LLMs) and API services. As a Product Support Engineer, you will: Provide first-line technical support with a variety of complexity, from simple billing or account questions for individuals to complex, incident-level issues and debugging.

Assist customers with API integration, usage, and best practices for performance and reliability. Strong technical background with experience in troubleshooting APIs, SDKs, or software integrations.



Familiarity with AI/ML concepts, particularly Large Language Models and model deployment.

Proficiency in Python and experience with APIs. Bachelor's degree in Computer Science, Engineering, or related field;

Experience supporting AI/ML products or developer-focused platforms. Knowledge of model compression techniques and performance optimization. Contributions to documentation, tutorials, or developer community forums.

Experience using ticketing and support tools (e.Zendesk, Jira, or similar). Founded in 2019, we are a well-funded, fast-growing deep-tech company with a team of 180+ employees worldwide. Recognized by CB Insights (2023 & 2025) as one of the Top 100 most promising AI companies globally, we are also the largest quantum software company in the EU.

CompactifAI → a groundbreaking compression tool for foundational AI models, reducing their size by up to 95% while maintaining accuracy, enabling portability across devices from cloud to mobile and beyond. Singularity → a quantum and quantum-inspired optimization platform used by blue-chip companies in finance, energy, and manufacturing to solve complex challenges with immediate performance gains. You'll be working alongside world-leading experts in quantum computing and AI, developing solutions that deliver real-world impact for global clients.

📌 Product Support Engineer - Junior Engineer (Madrid)
🏢 Multiverse Computing
📍 Madrid