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).

Fixed-term contract ending in 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.

Required Qualifications

2–5 years of experience across frontend and backend development.
Proficient with React/Next.js and TypeScript on the frontend, plus Python (FastAPI/Django) on the backend.
Experience building data-intensive dashboards, experiment tracking UIs, or internal automation tools.
Strong understanding of API design, data modeling, and frontend–backend integration.
Experience with SQL databases, containerized development (Docker), and CI/CD pipelines.
Experience with AWS or cloud-based deployment environments.
Product-driven approach — able to collaborate with researchers and PMs to translate exploratory workflows into production-quality tools.

Preferred Qualifications

Familiarity with LLM lifecycle and MLOps tools (Hugging Face, Flyte, MLflow, LangChain).
Experience with data visualization libraries (Plotly, Recharts, D3.js).
Understanding of workflow orchestration or background job systems (Celery, Argo, Flyte).
Proven ability to design user experiences that simplify complex R&D processes.
Passion for turning automation and ML research insights into polished, user-centric internal products.

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: 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 · Madrid, Barcelona

Fullstack Engineer (Fixed-term contract)

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