Senior Rust Engineer (Relocation to Spain)

Do you want to work for an International Service Delivery Center in Spain as a Senior Rust Engineer?

You will be part of a cross-functional agile team building a next-generation data management platform within a highly regulated environment. The system is designed using a distributed, event-driven microservices architecture, handling complex workflows, real-time data processing, and integrations with external systems.

The platform emphasizes scalability, resilience, traceability, and high reliability, leveraging modern technologies such as Rust, container orchestration, and event sourcing patterns. The team operates within an agile framework, focusing on continuous delivery, built-in quality, and strong engineering practices.

At ERNI, you are never just a number. Even if you work on an external project, you will feel part of the team and always supported.

How do we make this happen?

With people. Besides your team and manager, you will have several support figures like a godparent, who will help you with the practical and administrative aspects of daily life during your first 6 months.

And the second most important person after you, your mentor, who will guide you through your entire onboarding and career at ERNI. You will have regular 1:1 meetings with them, and recurrently, you will work on your development plan to define your short-, medium-, and long-term goals.

At ERNI, we highly value experience and technical knowledge. As a senior profile, you will have the space to continue growing, whether by deepening your technical skills or having greater influence on project decisions, with autonomy and the opportunity to share knowledge with other experts.

And if you are interested in mentoring, there is also space for that: supporting other ERNIans while still focusing on the technical excellence that sets us apart.

What you will bring

• Bachelor’s degree in Software/Electrical Engineering or a related field.
• Strong hands‑on Rust development experience (ideally 2+ years) with deep knowledge of ownership, borrowing, lifetimes and async/await.
• Practical experience with Rust web/async libraries and ecosystem (e.g., Tokio, Actix‑web, Rocket, Serde, SQL libraries).
• Experience designing and implementing event‑driven, distributed systems.
• Familiarity with design patterns for distributed systems and resilient architectures.
• Experience with Linux containers and orchestration (Docker, Kubernetes) and basic scripting.
• Experience with automated testing and integration testing between backend and frontend.
• Working knowledge of DDD, TDD and BDD practices.
• Experience working in Agile environments (Scrum, Kanban, or similar).
• English fluency.

Nice to have

• Prior involvement in regulated environments (e.g., medical devices) and familiarity with quality/regulatory standards.
• Proficiency with React and automated UI testing.
• Exposure to AI‑enabled development practices and modern cloud‑native architectures.
• German language skills.
• ISAQB Foundation or relevant advanced modules (or equivalent).

You will be responsible for

• Design, develop and maintain robust Rust backend components, applying pragmatic problem‑solving and deep technical knowledge.
• Implement asynchronous Rust solutions and integrate them into event‑driven architectures.
• Contribute to architecture and design reviews; define and document unit specifications, interfaces and quality attributes.
• Build and maintain integrations with LIS/LIMS, lab instruments and other lab IT systems; handle data persistence, auditing and accessibility requirements.
• Ensure timely delivery of high‑quality software that meets regulatory and QMS requirements.
• Implement and maintain automated testing and ensure traceability to requirements.
• Maintain documentation and regulatory artifacts required for audits and compliance.
• Drive continuous improvement of code quality, reliability and performance; mentor peers and promote ownership across the team.