Multiverse is a well-funded, fast-growing deep-tech company founded in 2019. We are the largest quantum software company in the EU and have been recognized by CB Insights (2023 and 2025) as one of the 100 most promising AI companies in the world.
With 180+ employees and growing, our team is fully multicultural and international. We deliver hyper-efficient software for companies seeking a competitive edge through quantum computing and artificial intelligence.
Our flagship products, CompactifAI and Singularity, address critical needs across various industries:

CompactifAI is a groundbreaking compression tool for foundational AI models based on Tensor Networks. It enables the compression of large AI systems—such as language models—to make them significantly more efficient and portable.

Singularity is a quantum- and quantum-inspired optimization platform used by blue-chip companies to solve complex problems in finance, energy, manufacturing, and beyond. It integrates seamlessly with existing systems and delivers immediate performance gains on classical and quantum hardware.

You’ll be working alongside world-leading experts to develop solutions that tackle real-world challenges. We’re looking for passionate individuals eager to grow in an ethics-driven environment that values sustainability and diversity.
We’re committed to building a truly inclusive culture—come and join us.

About the Role

We are seeking a proactive and technically skilled Product Support Engineer to join our team on a temporary basis (contract) and provide customer-facing technical support for our compressed Large Language Models (LLMs) and API services.

You will be the first point of contact for technical inquiries, troubleshooting, and guidance, helping customers maximize value from our AI solutions. This is a unique opportunity to work with cutting-edge AI technology, ensure high customer satisfaction, and contribute to the success of a major new initiative.

As a Product Support Engineer, you will:

Become an expert in all Multiverse Computing’s products
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
Investigate and resolve customer-reported issues by reproducing problems and identifying root causes.
Collaborate with engineering teams to escalate and resolve complex technical problems.
Assist customers with API integration, usage, and best practices for performance and reliability.
Document common issues, solutions, and best practices in a customer knowledge base.
Communicate clearly and empathetically with customers, ensuring high satisfaction and trust.

Required Qualifications

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.
Excellent communication and problem-solving skills; able to explain technical concepts to non-technical users.
Bachelor’s degree in Computer Science, Engineering, or related field; or equivalent practical experience.

Preferred Qualifications (Nice-to have)

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.g., Zendesk, Jira, or similar).

Perks & Benefits

Temporary contract of up to 9 months, ending by June 2026.

Competitive salary

Equal pay guaranteed.

Relocation package (if applicable).

Hybrid opportunity.

Flexible working hours.

Progressive Company. Happy people culture.

Department: Technical
Locations: San Sebastian, Spain, Madrid, Barcelona
Employment type: Contract
Workplace type: Hybrid
Seniority level: Associate

About MULTIVERSE COMPUTING

Come and join our multicultural team!

5 locations
+27 languages

Founded in 2019

Coworkers +150

Technical · Multiple locations

Product Support Engineer(AI/LLM) (Contract)

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