Backend Engineer (Fixed-term contract) Technical · Madrid, Barcelona, Zaragoza

Hyperproof; Madrid; Presencial; EUR 50.000 - 70.000; Jornada completa

Descripción de la vacante

A cutting-edge deep-tech company located in Spain is seeking a Backend Engineer to work on revolutionary AI solutions. You will develop and maintain backend systems, ensuring high performance for APIs, and work in a hybrid role within a dynamic environment. Competitive salary offered starting from €45,000 along with unique bonuses. Join a team that values ethics and sustainability while transforming the AI landscape.

Servicios

Competitive salary

Signing and retention bonuses

Relocation package

Flexible working hours

International exposure

Formación

• 2–5 years of experience developing backend systems.
• Strong understanding of API design and performance optimization.
• Experience with Docker and Kubernetes for scalable services.

Conocimientos

Python

Go

RESTful API

gRPC

Docker

Kubernetes

relational databases

Git

AWS

CI/CD

Herramientas

Docker

Kubernetes

AWS

Descripción del empleo

Technical · Madrid, Barcelona

Backend Engineer (Fixed-term contract)

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 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 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.

• 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!