Software Engineer (9-month contract with bonus incentives)

Hyperproof; Barcelona; Híbrido; EUR 70.000 - 90.000; Jornada completa

Descripción de la vacante

A European deep-tech leader is seeking a Software Engineer for a 9-month hybrid contract. The role involves developing cloud-based software systems and requires expert knowledge of Python. Candidates should have experience in machine learning and data science, and a bachelor's degree in Computer Science or a related field. Attractive salary starting from €45,000 and bonus incentives offered.

Servicios

Competitive salary

Signing bonus

Retention bonus

Relocation package

Flexible working hours

International exposure

Formación

• 1-2 years of experience in software engineering focused on machine learning and data science (junior).
• 3+ years of experience in software engineering focused on machine learning and data science (mid).
• Experience in developing and deploying software systems on the cloud.

Responsabilidades

• Develop and deploy software systems on the cloud.
• Maintainable, high-quality code through testing and documentation.
• Design efficient application workflows.

Conocimientos

Python

Strong communication skills

Working with APIs

Knowledge of Rust and C/C++

Educación

Bachelor's degree or higher in Computer Science or related field

Herramientas

AWS

Git

CI/CD

Descripción del empleo

We are looking to fill this role immediately and are reviewing applications daily. Expect a fast, transparent process with quick feedback.

Overview

Software Engineer (9-month contract with bonus incentives) | Technical · Multiple locations

Location: San Sebastian, Spain; Madrid; Barcelona. Employment type: Contract. Workplace: Hybrid. Seniority: Associate.

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).
• Up to 9-month contract, ending on 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.

As a 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.

Responsibilities

• Develop and deploy software systems on the cloud (e.g., AWS).
• Maintainable, high-quality code through testing, documentation, and clean design principles, and help instill this in others.
• Design efficient application workflows and work with APIs.

Required Qualifications

• Bachelor's degree or higher in Computer Science, a related technical field or relevant industry experience.
• Expert knowledge of Python and preferably other languages such as Rust and C/C++.
• Junior: 1-2 years of experience in software engineering with focus on machine learning and data science.
• Mid: 3+ years of experience in software engineering with focus on machine learning and data science.
• Experience in developing and deploying software systems on the cloud, e.g. AWS.
• Proficiency with git and CI/CD pipelines.
• Commitment to maintainable, high-quality code through best practices such as testing, documentation, and clean design principles, and the ability to instil this in others.
• Strong ability to work with APIs and design efficient application workflows.
• Excellent communication and soft skills: a people’s person.
• Ability to work with experts from different professional backgrounds, both in-person and through online resources.

Preferred Qualifications

• Familiarity with developing on and with LLMs, including tools and frameworks such as HuggingFace Transformers, OpenAI APIs, vector databases, and model-serving platforms.
• Experience with distributed computing frameworks and concepts, such as Ray, Apache Spark, or distributed training/inference across GPUs and nodes.
• Experience in working with cross-functional teams.
• Experience with algorithm development and optimization, designing scalable and robust class structures.

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!

About MULTIVERSE COMPUTING

Come and join our multicultural team! 5 locations | 27 languages

Founded in 2019 • Coworkers: +150

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