Senior Software Engineer

Multiverse Computing

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.

This opportunity is to work in our offices in San Sebastián, Spain.

As a Senior 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 degree or higher in Computer Science, a related technical field or relevant industry experience.
• Expert knowledge of Python and preferably other languages such as C/C++
• 8+ years of experience in software engineering with focus on machine learning and data science.
• Experience in designing and developing distributed data intensive systems on the cloud, e.g AWS.
• Experience with algorithm development and optimization, designing scalable and robust class structures.
• Demonstrated commitment to maintainable, high-quality code through best practices such as testing, documentation, and clean design principles, and the ability to instill this in others.
• Experience in coaching and knowledge sharing to familiarize teams with software engineering best practices.
• Excellent communication skills.
• Ability to work with experts from different professional backgrounds, both in-person and through online resource.
  
  
  

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 in leading teams
• Familiarity with accelerators (GPU, FPGA, TPU, Analog Co-processors, etc.)
  
  
  

Perks & Benefits

• Indefinite contract.
• Equal pay guaranteed.
• Variable performance bonus.
• Signing bonus.
• We offer work visa sponsorship (If applicable).
• Relocation package (if applicable).
• Private health insurance.
• Eligibility for educational budget according to internal policy.
• Hybrid opportunity.
• Flexible working hours.
• Language classes and discounted lunch options.
• Working in a high paced environment, working on cutting-edge technologies.
• Career plan. Opportunity to learn and teach.
• Progressive Company.
• Happy people culture.
  
  
  

As an equal opportunity employer, Multiverse Computing is committed to building an inclusive workplace. The company welcomes people from all different backgrounds, including age, citizenship, ethnic and racial origins, gender identities, individuals with disabilities, marital status, religions and ideologies, and sexual orientations to apply.

Come and join our multicultural team!

5 locations

+27 languages