Fullstack Engineer (Fixed-term contract)

Madrid - Spain

Monthly Salary: Not Disclosed

Posted on: 30+ days ago

Vacancies: 1 Vacancy

Job Summary

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 5080%.
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 45000 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

25 years of experience across frontend and backend development.
Proficient with React/ 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 frontendbackend 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 ).
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.

Youll 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!

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 i...