Senior Rust Engineer

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.

Key Responsibilities:

• 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.
• Communicate complex technical concepts clearly to tech leads, product owners and cross‑functional teams to foster collaboration and learning.
• Participate in Agile ceremonies and coordinate with other teams for aligned delivery.
• Follow security‑ and privacy‑aware development practices and adhere to relevant standards and company policies.

Requirements:

• 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).

What if the project ends?

We work on a wide variety of projects, technologies, and sectors, allowing you to keep growing in different environments. If a project ends or you feel ready for a new challenge, we’ll find another one that aligns with your professional development.

Our working model

We ask you to be available for key meetings. Need to leave for a doctor’s appointment or to pick up your child from school? No problem. We trust you to deliver quality work within your 40-hour workweek.

Our model is hybrid: we usually go to the office 2 days a week, but we love seeing each other’s faces; the best stories always happen in the office!

You will also enjoy:

• We cover your certifications and reward technical achievements up to €1,400.
• Private health and travel insurance.
• Full coverage for sick leave + 1 extra day off per month without medical leave.
• Free emotional, legal, and family support.
• Gym discounts + sports compensation.
• Flexible remuneration: meals, transport, childcare, etc.
• Referral bonuses: up to €6,000 per candidate and €5,000 per client.
• 23 working days of vacation.
• Free language courses: English, Spanish, Catalan and German.

And the salary? 

We will discuss it during the first call. If it is important to you, feel free to ask!

WOULD YOU LIKE TO BECOME AN ERNIan? APPLY NOW!