Backend 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 developing and maintaining backend systems in Python or Go.
Strong understanding of RESTful API or gRPC design versioning and performance optimization.
Experience with Docker and basic familiarity with Kubernetes for deploying scalable services.
Solid understanding of relational databases (PostgreSQL/MySQL) and schema design.
Experience integrating or automating workflows across multiple systems (data CI/CD ML).
Proficiency with Git testing frameworks and CI/CD pipelines (GitLab GitHub Actions).
Experience with AWS or cloud-based deployment environments.
A product-oriented mindset able to turn R&D scripts or prototypes into stable usable APIs or microservices.

Preferred Qualifications

Experience with ML workflow orchestration (Flyte Airflow MLflow or Kubeflow).
Exposure to LLM inference/deployment tools (vLLM Hugging Face Hub NVIDIA NIM or Triton).
Experience building or integrating benchmarking evaluation or data automation pipelines.
Familiarity with message queues or event-driven architectures (Kafka NATS RabbitMQ).
Understanding of observability tooling (Prometheus Grafana OpenTelemetry).
Demonstrated ability to collaborate with product and design teams to define backend contracts that enable intuitive user experiences.

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...