Senior Full-stack Developer (Next.js / Node.js) – Fixed-Term Contract

OKAPI: Orbits; A distancia; EUR 40.000 - 60.000; Jornada completa

Descripción de la vacante

A leading space technology company in Barcelona is seeking an experienced software developer to design and maintain high-performance web applications and APIs. The ideal candidate has a degree in Computer Science or Software Engineering and several years of experience with React.js, Node.js, and TypeScript. You'll collaborate with a diverse team to contribute to innovative space solutions. This is an initially fixed-term position with opportunities for extension and remote work arrangements.

Servicios

Flexible hours

Training budget for continuous development

German classes via Lingoda

Formación

• Several years of hands-on experience building production-grade applications with React.js, Node.js, and TypeScript.
• Strong MongoDB expertise: schema design, data modeling, indexing, aggregation, and performance optimization.
• Proven ability to debug complex issues across frontend, backend, and data layers.

Responsabilidades

• Design, develop, and maintain scalable web frontends using Next.js and Node.js-based APIs.
• Implement and optimize user-friendly, high-performance, and secure web applications.
• Collaborate closely with scientists and engineers to translate complex domain requirements.

Conocimientos

React.js

Node.js

TypeScript

JavaScript fundamentals

MongoDB expertise

RESTful API design

Git-based workflows

Debugging complex issues

Team-oriented mindset

Good English

Educación

Degree in Computer Science or Software Engineering

Formal IT specialist training

Herramientas

Next.js

Docker

Kubernetes

Descripción del empleo

Your mission

Your mission is to develop and maintain intuitive, high-performance web applications and APIs that provide seamless access to OKAPI:Orbits’ end-to-end solutions across Mission Design, Space Situational Awareness (SSA), Space Traffic Management (STM), Flight Dynamics (FD), and Space Traffic Coordination (STC), supporting the entire lifecycle of satellite operators within an initially fixed-term contract until the end of 2026, with a high likelihood of a subsequent extension of up to two additional years, and a planned start date of April 1, 2026. This position is employed through OKAPI:Orbits liitty Spanish legal entity.

You design and implement elegant user interfaces and robust service integrations that connect complex space-data pipelines with an accessible, reliable user experience.

You work on the systems that enable satellite operators and space agencies to visualize, plan, and manage their missions efficiently in an increasingly dynamic orbital environment.

Research shows that women are less likely than men to apply for a position unless they meet 100% of the listed requirements. Please know that if it’s your case — but you are passionate about space technology, building reliable software, and contributing to a more sustainable space environment — we strongly encourage you to apply.

OKAPI:Orbits already brings together a highly diverse team, eisen we actively continue to strengthen this diversity, as research consistently shows that heterogeneous teams achieve higher performance and drive innovation.

Your tasks and responsibilities

• Design, develop, and maintain scalable web frontends using Next.js and Node.js-based APIs
• Implement and optimize user-friendly, high-performance, and secure web applications for satellite operators and space agencies
• Design and maintain interfaces between frontend, API, and microservices, including authentication, authorization, and data flow management
• Collaborate closely with scientists and engineers to translate complex domain requirements into userорот-centric software solutions
• Take ownership of frontend architecture, performance, usability, and maintainability
• Plan and document implementation steps, from technical design to production deployment
• Ensure code quality, automated testing, and adherence to security and development standards
• Contribute to the improvement of CI/CD pipelines, monitoring, and automation to support reliable and continuous delivery
• Analyze and resolve complex issues across frontend, API, and data layers with a focus on reliability and user experience
• Work in small, interdisciplinary teams, bringing your full-stack expertise into cross‑functional projects

Your profile

Must-haves

• Degree in Computer Science, Software Engineering, or a related field, or formal IT specialist training
• Several years of hands‑on experience building production‑grade applications with React.js, Node.js, and TypeScript
• Realm understanding of JavaScript fundamentals, asynchronous programming, and modern ECMAScript features
• Strong MongoDB expertise: schema design, data modeling, indexing, aggregation, and performance optimization in high‑load systems
• Experience with RESTful API design and integration, including authentication, authorization, and versioning
• Familiarity with Git‑based workflows, pull requests, and collaborative code reviews
• Proven ability to debug complex issues across frontend, backend, and data layers
• Focus on clean, maintainable code, testing, and long‑term software reliability
• Proactive communication and team‑oriented mindset, comfortable working in distributed setups
• Good English, written and spoken

Nice-to-haves

• Experience with Next.js 15+, including React Server Components, SSR, or ISR for performance‑_has frontends
• Experience with Docker and Kubernetes for local development, deployment, and scaling of services
• Familiarity with microservice architectures
• Experience with Python or Java, particularly for backend or data‑processing pipelines
• Knowledge of CI/CD tools (GitLab CI) and frontend testing frameworks (Cypress, Vitest, Jest)
• Experience with monitoring and observability (DataDog, Sentry, OpenTelemetry)
• Exposure to 3D visualisation frameworks such as CesiumJS or WebGL libraries
• Interest or experience in the space or aerospace domain
• Experience in mentoring or technical leadership within agile teams

Why us?

• Flat hierarchy, small teams, flexible hours
• Onboarding in Braunschweig, afterwards remote from Spain
• Early ownership, influence technical direction
• Training budget for continuous development
• German classes via Lingoda
• Join space events and conferences, advocate for sustainable space