Senior Frontend Software Engineer

October 21, 2026

Senior

Tres Cantos, Spain

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English is required

Description

The company is building Earth's System of Record, a data infrastructure layer that lets AI understand and predict physical changes on the planet's surface. As a Senior Frontend Software Engineer in the Digital Services team you own the frontend architecture of the web-based customer portal and turn complex Earth observation data into intuitive, trusted experiences. The role combines hands-on React and TypeScript delivery with technical leadership: mentoring engineers, leading code reviews and documenting architectural decisions. You report to the Head of Digital Services and work closely with UX/UI, backend, cloud, data and DevOps colleagues.

Responsibilities

Shape the frontend architecture of the web-based customer portal and keep the presentation layer modular, scalable, secure and maintainable
Build intuitive interfaces and visualizations that make Earth observation data understandable and actionable for customers
Establish engineering best practices for React, TypeScript, component architecture, testing, accessibility and API integration
Ensure the frontend architecture aligns with requirements such as GDPR and the EU AI Act
Partner with UX/UI, backend, cloud, data and DevOps teams to move products from definition to reliable, integrated releases
Collaborate on the frontend roadmap and document architectural decisions
Mentor engineers and lead code reviews across the team
Strengthen quality and reliability through automated testing, observability, feature flags, progressive deployment and rollback strategies
Evaluate tools that improve developer productivity

Requirements

6+ years in web software development with substantial ownership of customer-facing portals or products in a SaaS or ISV environment
Deep frontend expertise: advanced JavaScript, TypeScript, HTML/CSS and React
Experience with Tailwind CSS or comparable UI component libraries
Track record designing modular, highly available, cloud-native applications at scale
Strong REST API experience and familiarity with gRPC, WebSockets or OData
Sound knowledge of authentication, authorization, data protection, SOLID principles and clean frontend architecture
Experience defining frontend testing strategy and automated CI quality gates
Practical knowledge of observability, feature flags, progressive delivery and rollback practices
Confidence documenting architectural decisions, shaping a roadmap and mentoring colleagues
Leading code reviews and discussing technical debt pragmatically with Product
Excellent English and Spanish communication skills
Bachelor's degree in computer science or a related field, or equivalent practical experience

Conditions

Full-time employment in a mission-driven Earth data company
Competitive compensation and benefits package designed to support wellbeing and growth
Meaningful ownership, continuous learning and a global, international multidisciplinary team
Work location: Tres Cantos, Community of Madrid, Spain
Reasonable adjustments during hiring available on request