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FCC Medio Ambiente

Contract Java Developer

New EuropeContract

Senior backend developer at FCC Medio Ambiente in Barcelona, evolving the corporate Vision platform's backend services on the JVM (Scala preferred, Java accepted) and AWS. Day-to-day work covers REST/OpenAPI APIs, PostgreSQL persistence, async processes, migrating from a monolith to modular services, and code quality/observability with tools like SonarQube.

API AWS Cloud DevOps Java +6 skills

Frontend Developer (M/F/D) Energy Management System (Edge/Cloud)

Builds and enhances the web frontends of PRAMAC's Energy Management System for battery storage, PV, and charging infrastructure — real-time energy dashboards, data visualizations, and control UIs — mainly using React, TypeScript, Vite, GraphQL, Storybook, and Capacitor for iOS/Android apps.

Android API Cloud CSS GraphQL +5 skills

Mensoft Consultores

Senior Backend Developer

New EuropeSenior

IT consultancy Mensoft Consultores seeks a Senior Backend Developer to join a stable project for one of its major clients, working 100% remotely from Madrid. Day-to-day work is Java/Spring Boot microservices and REST APIs, integrating enterprise systems via IBM MQ and Kafka, with PostgreSQL and Kubernetes/Helm deployment.

API CI/CD CSS DevOps Git +11 skills

34K – 38K €

Full Stack Developer - Java

Onsite full-stack developer (Barcelona city centre) designing, building and maintaining scalable web applications for a leading Spanish hotel group with 220+ hotels, hired via recruiter Ethikos. Core stack: Java back end, JavaScript/Angular front end, Node.js, MongoDB and microservices with DDD.

Angular BDD Java JavaScript MongoDB +1 skills

Oxigent Technologies

Python Developer (Data Environment) - Hasta €45.000 Al Año

Oxigent Technologies hires a Python developer (3+ years) to design and build Streamlit data applications and interactive visualizations for an international digital hub — defining dev standards, maintaining/optimize apps, and mentoring teammates. Fully remote from Spain, or hybrid in Barcelona; up to €45,000 gross/year.

Python Streamlit

Junior Java Developer

New EuropeJunior

Junior developer at Slashmobility, a boutique digital transformation consultancy, working on a stable project building Java microservices, web frontends with React.js, and hybrid apps with React Native, in an Agile team, on a hybrid basis from Barcelona.

Agile Java React

Senior Backend Developer

New EuropeSenior

Senior Backend Developer at Accude for a long-term hybrid project in Madrid (3 days office, 2 remote): designing and maintaining high-performance Java/Spring backend services and RESTful APIs, working with SQL/NoSQL databases, cloud platforms (AWS/GCP/Azure), and Docker/Kubernetes CI/CD tooling.

API AWS Azure CI/CD Cloud +16 skills

Oxigent Technologies

Python Developer (Streamlit) - Hasta €50.000 Al Año

Build and evolve interactive data applications in Streamlit for an international digital hub: define development standards, ship new features and visualizations, support deployed apps, and mentor teammates. Core stack is Python/Streamlit plus advanced JavaScript; remote from Spain (Barcelona hybrid option), up to €50,000 gross/year.

JavaScript Python Streamlit

3MT GALICIA GLOBAL SERVICES, S. L.

Java Developer With Data

TIBCO Integration Engineer supporting and evolving integrations (TIBCO 5.16, SAP S/4HANA) for a multinational healthcare company: monitoring, incident analysis, Jira documentation, and maintenance changes with teams across Europe. Hybrid from Valencia (3 days on-site); requires TIBCO experience, XML/JSON/SQL, and fluent Spanish and English.

Jira JSON SAP SAP S/4HANA SFTP +4 skills

Publicis Groupe

.Net Backend Developer

Design, develop, and maintain backend services and RESTful APIs using C#, .NET, ASP.NET Core, and EF Core within microservices architectures for Publicis Groupe Spain's strategic platforms, based in Madrid and working with relational databases in multidisciplinary international teams.

API C# .NET Microservices RDBMS +1 skills

Ai R&D Python Developer | Llms & Fastapi Expert

New HybridEurope

Python developer on an AI R&D project at ALTEN Spain, working hybrid from Madrid building LLM-powered services and APIs with FastAPI on Azure. Requires 4+ years of Python, API and unit-testing experience, and strong English.

API Azure Python Unit Testing

Appcast, Aderen

Senior Python Developer - Up To €240 A Day - Remote

New EuropeSenior

Senior Python developer for a long-term payments project, working 100% remotely from Spain on a freelance contract paying up to €240/day + VAT. Day to day: designing services in Python on AWS, deploying to Kubernetes, using Terraform IaC, Kafka/SQS messaging, and monitoring with Datadog/Prometheus.

AWS Kafka Kubernetes Observability Python +1 skills

up to 240 € / day

Frontend Developer - React 19+

Frontend developer at Dative, an Itnig-backed startup building centralized employee-benefits infrastructure for SMEs, based in Barakaldo (Bilbao), Spain, in a hybrid role. Day to day: building a next-generation React app with modern TypeScript, React 19+ (Server Components, Suspense, streaming SSR), meta-frameworks like Next.js/Remix, Tailwind, and Testing Library/Vitest/Playwright.

Agile Astro CSS Cypress JavaScript +9 skills

Full Stack Developer

Full Stack Developer owning the website and digital infrastructure of a luxury brand in Palma de Mallorca: building front-end and back-end features, APIs, and data flows, with heavy focus on Shopify (Hydrogen), Sanity, and integrations with Salesforce and NetSuite.

Administración pública

Desarrollador Java Backend Aso – Remoto - Remoto

Remote Java backend developer role (6+ years' experience) on a technology project for a Spanish public administration client. Day-to-day is backend Java development, with some frontend knowledge (Angular or Vue) expected; a relevant university degree is required.

Angular Java Vue

Frontend Developer | Javascript | Microfrontends | Remote Spain

New RemoteEuropeContract

Frontend Developer at THEWHITEAM Consulting in Spain, building reliable web apps with JavaScript (ES5/ES6), HTML/CSS and microfrontend architectures, with heavy emphasis on automated testing (unit, E2E, visual, accessibility). 100% remote, 12-month project, €33k–35k gross per year.

Accessibility Agile Angular API Azure +25 skills

33K – 35K €

CORUS Consulting

Full Stack Developer - Remote

Full stack developer (100% remote in Spain) at digital-transformation consultancy knowmad mood: build enterprise apps with a Python-heavy backend (~60%) and a React/Next.js + Material UI frontend (~40%), design REST APIs and microservices, work with Snowflake data, and integrate AI/LLM solutions. English C1 required.

Angular CSS Docker HTML Java +4 skills

Sollers Consulting

Java Developer - Barcelona

New EuropeContract

Java developer in Barcelona implementing and customizing core insurance systems (Guidewire, TIA, INSIS) for Sollers Consulting's insurance, banking and leasing clients. Day to day: designing IT solutions, writing Java/Gosu code with unit tests and documentation in agile teams using Git, Jenkins, SOAP/REST and Oracle/MSSQL. Hybrid office model, permanent contract.

Agile Design Patterns Git IntelliJ IDEA Java +5 skills

Senior Frontend Developer - €300 - €400 A Day

New EuropeContractSenior

Contract Senior Frontend Developer (€300–€400/day, Spain) building high-conversion, responsive web experiences for public websites and internal tools. Day to day: HTML/CSS/JS work in PHP/Twig environments, A/B testing, cross-browser testing, and collaboration with Product, Marketing, and Design.

AI CSS HTML JavaScript jQuery +5 skills

300 – 400 € / day

Senior Frontend Developer - €300 - €400 A Day

New EuropeContractSenior

Contract Senior Frontend Developer at WhatJobs building high-performance, conversion-focused interfaces for public websites and internal tools. Works with Product, Marketing, and Design, integrates into PHP via Twig, and runs A/B tests. Core stack: HTML5, CSS3, ES6 JavaScript, jQuery, SASS/BEM.

300 – 400 € / day