Senior React Developer
Do you want to work for an International Service Delivery Center in Spain as a Senior React Developer? 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.
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 six months, and a mentor, who will guide you through your onboarding and career at ERNI. You will have regular 1:1 meetings and will work on your development plan to define short‑, medium‑ and long‑term goals.
What You Will Bring
- Bachelor’s degree in Software/ Engineering or a related field.
- Strong experience with React.js and its ecosystem.
- Solid understanding of JavaScript, TypeScript, HTML5, and CSS3.
- Experience with state management solutions (Redux, MobX, etc.).
- Experience consuming RESTful APIs.
- Proficiency with Git.
- Experience with testing frameworks (Jest, React Testing Library, Cypress, etc.).
- Good understanding of responsive design and cross‑browser compatibility.
- Proven experience designing scalable, maintainable, and modular UI architectures.
- Ability to translate functional and business requirements and UX/UI designs into intuitive pixel‑perfect UI components and user flows.
- Familiarity with Agile methodologies (Scrum, Kanban, SAFe).
- Focus on quality and craftsmanship, not just delivery speed.
- A collaborative approach: we succeed as a team, not as individuals.
- Comfort working in international environments.
- English fluency. German is a plus.
What You Will Be Responsible For
- Develop scalable, user‑centric frontend applications using React and modern frontend technologies.
- Design and maintain a robust, modular UI architecture with a focus on performance, accessibility and security.
- Implement automated testing (unit, integration and end‑to‑end) and apply TDD/BDD practices to ensure traceability to requirements.
- Integrate frontends with backend APIs and lab systems (LIS/LIMS); ensure data persistence, auditing and security requirements are met.
- Support CI/CD and containerized environments (Docker/Kubernetes) to enable reliable delivery and production troubleshooting.
- Maintain required documentation and regulatory artifacts to comply with QMS and applicable standards.
- Collaborate with Product, UX, backend and validation teams in Agile/SAFe ceremonies; mentor peers and contribute to architecture decisions.
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 two 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.
About Our Company
ERNI is a Swiss Software Engineering company leader in building complex, customized software solutions. It has more than 25 years of experience using technology to have a positive impact on people’s lives. We build digital solutions that connect the physical world (devices & connectivity) with the digital one (software solutions, connected or consuming their data). Our teams prioritize the software lifecycle and ensure that our code is both clean and secure. Our maturity in building high‑impact software solutions approaches us whatever industry looking for quality and sophistication (e.g., Gaming, FMCG or Validation & Inspection).
Salary & Application
We will discuss salary during the first call. If it is important to you, feel free to ask!
Would you like to become an ERNI? Apply now!
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