Senior Backend Software Engineer

Contract: Full-time, long-term B2B contractor
Compensation: €80,000–€100,000 annually, negotiable depending on experience
Industry: Deep Tech / Engineering Software

The Opportunity

We're partnering with a US deep-tech company developing advanced engineering software.

We're seeking an experienced backend engineer to help design, develop and operate scalable systems supporting complex computational workloads.

This is a hands-on engineering position offering substantial technical ownership within a small, senior team.

What You'll Work On

• Design and develop scalable backend services and APIs.
• Build and improve distributed processing and job scheduling systems.
• Develop cloud and hybrid-cloud infrastructure.
• Improve data management, caching, storage and synchronisation.
• Enhance platform scalability, reliability and performance.
• Take ownership of production systems from design through deployment and operation.

Requirements

• Strong expertise in at least one of Java, Python or C++.
• Proven experience building and operating distributed systems in production.
• Strong cloud engineering experience, preferably AWS.
• Hands-on ownership of complex backend services.
• Experience working with large-scale workloads or data-intensive systems.
• Bachelor's degree in computer science, computer engineering or a closely related field.
• Professional English communication skills.
• Based in Spain, with approximately six hours of overlap with the US team.

Nice to Have

• HPC or scientific computing experience.
• Distributed job schedulers or batch processing.
• Kafka, SQS, SNS or similar messaging systems.
• Kubernetes, Docker or Terraform.
• Experience with cloud-based compute infrastructure.

What We Offer

• Fully remote working from Spain.
• Long-term contractor engagement.
• €80k–€100k annual compensation, with flexibility depending on experience and technical expertise.
• Equity participation.
• Flexible working hours and unlimited PTO.
• Learning and AI tools budgets.
• Periodic company-paid travel to the US.

Interview Process

Two to three technical conversations, followed by a final conversation with a co-founder. No online assessment.

Interested?

Apply through Tech StaQ or email your CV to [email protected].

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