We are looking to fill this role immediately and are reviewing applications daily. Expect a fast, transparent process with quick feedback.

Why join us?

We are a European deep-tech leader in quantum and AI, backed by major global 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.”

We offer

• Competitive annual salary starting from €45,000, based on experience and qualifications.

• Two unique bonuses: signing bonus at incorporation and retention bonus at contract completion.

• Relocation package (if applicable).

• Up to 9-month contract, ending on June 2026.

• Hybrid role and flexible working hours.

• Be part of a fast-scaling Series B company at the forefront of deep tech.

• Equal pay guaranteed.

• International exposure in a multicultural, cutting-edge environment.

As a Software Engineer, you will

• Join a world-class team of Quantum and AI experts with an extensive track record in both academia and industry.

• Work with Fortune-500 customers from government and private sectors.

• Collaborate with the founding team in a fast-paced startup environment.

• Tackle high value open problems from industry.

• Take on technical leadership and work together with software and DevOps engineers as well as our machine learning and quantum experts to industrialize Multiverse’s core technologies

Required Qualifications

• Bachelor's degree or higher in Computer Science, a related technical field or relevant industry experience

• Expert knowledge of Python and preferably other languages such as Rust and C/C++

• Junior: 1-2 years of experience in software engineering with focus on machine learning and data science.
• Mid: 3+ years of experience in software engineering with focus on machine learning and data science.

• Experience in developing and deploying software systems on the cloud, e.g. AWS

• Proficiency with git and CI/CD pipelines.

• Demonstrated commitment to maintainable, high-quality code through best practices such as testing, documentation, and clean design principles, and the ability to instil this in others.

• Strong ability to work with APIs and design efficient application workflows.

• Excellent communication and soft skills: a people’s person.

• Ability to work with experts from different professional backgrounds, both in-person and through online resources.

Preferred Qualifications

• Demonstrated familiarity with developing on and with LLMs, including tools and frameworks such as HuggingFace Transformers, OpenAI APIs, vector databases, and model-serving platforms.

• Experience with distributed computing frameworks and concepts, such as Ray, Apache Spark, or distributed training/inference across GPUs and nodes.

• Experience in working with cross-functional teams.

• Experience with algorithm development and optimization, designing scalable and robust class structures.

About Multiverse Computing

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.
Our flagship products address critical industry needs:

• 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. We are committed to an inclusive, ethics-driven culture that values sustainability, diversity, and collaboration — a place where passionate people can grow and thrive. Come and join us!

Department

Technical

Role

Software Engineer

Locations

San Sebastian, Spain, Madrid, Barcelona

Employment type

Contract

Workplace type

Hybrid

Seniority level

Associate

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