Senior Fullstack Engineer (React & Backstage) - 100% remote (From Spain)

Capitole; España; On-site; EUR 70,000 - 90,000; Full time

Benefits offered by this job

€1,200 annual training budget

Flexible working hours

Private health insurance fully covered

Employee discounts

Monthly follow-up and feedback

Sponsored football team

Team Buildings every two months

Internal technology communities

Job summary

Capitole is seeking a Senior Fullstack Engineer with a strong frontend mindset to join an international project. You will contribute to the evolution of the central platform used by developers across the organization, focusing on modern frontend experiences, Backstage integrations, and cloud-native solutions.

You will develop React-based UI components, build Backstage plugins, design REST API integrations, and collaborate with UX teams in an Agile environment across international teams.

Qualifications

• Strong proficiency with React.
• Experience working with REST APIs and asynchronous data processing.
• Solid understanding of UI/UX principles and reusable component design.
• Good knowledge of software, system and process architectures.
• Experience working in enterprise IT environments.
• Experience with AWS.
• Spanish and English C1 level.

Responsibilities

• Develop and enhance React-based UI components.
• Build and maintain Backstage plugins integrating multiple enterprise platforms.
• Design and implement integrations through REST APIs and platform services.
• Collaborate closely with UX teams to create intuitive developer experiences.
• Contribute to architecture, scalability, and platform evolution initiatives.
• Work with stakeholders across several international teams and organizational units.
• Participate actively in Agile ceremonies and continuous improvement activities.

Skills

React

REST APIs

UI/UX

AWS

Kubernetes

Backstage

Tools

Backstage plugins

GitHub integrations

Job description

At Capitole, we keep growing and we want to do it with you!

We are looking for a Senior Fullstack Engineer with a strong frontend mindset to join an international project.

You will contribute to the evolution of the central platform used by developers across the organization, working on modern frontend experiences, Backstage integrations, and cloud-native solutions.

What will you do?

• Develop and enhance React-based UI components.
• Build and maintain Backstage plugins integrating multiple enterprise platforms.
• Design and implement integrations through REST APIs and platform services.
• Collaborate closely with UX teams to create intuitive developer experiences.
• Contribute to architecture, scalability, and platform evolution initiatives.
• Work with stakeholders across several international teams and organizational units.
• Participate actively in Agile ceremonies and continuous improvement activities.

What are we looking for?

Must Have

• Strong proficiency with React.
• Experience working with REST APIs and asynchronous data processing.
• Solid understanding of UI/UX principles and reusable component design.
• Good knowledge of software, system and process architectures.
• Experience working in enterprise IT environments.
• Experience with AWS.
• Spanish and English C1 level.

Nice to Have

• Experience developing Backstage plugins or working with developer portal platforms.
• Experience with Kubernetes.
• Experience with AWS Lambda.
• Knowledge of developer ecosystems, GitHub integrations, compliance, monitoring or AI tooling.
• Experience integrating fact providers or platform data sources.

Soft Skills

• Ability to work in cross-functional and international environments.
• Proactive mindset and high level of autonomy.
• Experience working under Agile methodologies (Scrum/Kanban).

Why Capitole?

• €1,200 annual training budget for certifications, courses, books or events.
• Flexible working hours.
• Private health insurance fully covered by Capitole.
• Employee discounts through Club Capitole.
• Monthly follow-up and continuous feedback.
• Sponsored football team.
• Team Buildings every two months.
• Internal technology communities to share knowledge and learn from experts.

And most importantly...

A TEAM that truly cares about people.