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 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.”

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!

📌 Software Engineer (9-month contract with bonus incentives) (Donostia-San Sebastián)
🏢 Empresa líder
📍 Donostia-San Sebastián