21,403+ Fullstack Javascript Developer Jobs in Spain — Top Companies Hiring September 2026

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Senior Spark Backend Engineer Remote Spain

UST España & Latam is seeking a Senior Backend Spark Developer to design, develop, and optimize data processing solutions within the Client Contribution platform. You will build scalable Big Data pipelines and collaborate across multiple teams to drive performance and reliability. The role requires str ...

Senior Backend Engineer Remote, High Impact & Scalable

Playson is seeking a Senior Backend Developer who thrives in a deeply hands-on environment and enjoys being close to the code daily. Focus on building, optimising, and scaling backend services for a high-load system where performance and reliability are critical. You’ll tackle complex real-time challen ...

Senior Ruby on Rails Engineer — Remote Europe, High Impact

Sorcer is seeking a Senior Rails Developer to join their team in Spain. In this role, you will develop and maintain backend systems for a high-scale platform. Candidates should have over 10 years of Ruby on Rails experience and a strong ability to align tech with business goals. The position offers a competitive ...

Senior R Shiny Architect for Clinical Data

Premier Research in Spain is seeking a Senior R Programmer and Shiny Developer to join our Biostatistics team. You will design, develop, test, and maintain interactive R Shiny applications that support clinical trial activities and enable scalable analyses of large datasets. You will build reusable mod ...

Remote Senior Java Backend Engineer – Spring Boot, AWS

The Whiteam Consulting busca un/a Senior Java Backend Developer con experiencia en Spring Boot, AWS y Kubernetes para incorporarse a un proyecto tecnológico de alto impacto. Se valorará desarrollo de backend cloud-native y APIs REST, en un equipo especializado que diseña soluciones escalables basadas en micro ...

Remote Apache Spark Backend Engineer (Spain)

UST España & Latam is seeking a Backend Developer Analyst with at least 2 years of experience in backend development, specializing in Apache Spark and Big Data environments. The role emphasizes Agile methodologies, CI/CD with Git, GitHub, and Jenkins, and strong SQL skills. Proficiency in English (B2/C ...

Healthcare BD in Spain — SaaS/Data Growth Leader

Promptly Health is seeking a Business Developer for Spain's public health sector. You will learn the procurement landscape and deepen hospital networks, reporting to the Spanish Regional Manager. If you have 3–4 years in B2B sales and a genuine healthcare connection, this role is for you. You will driv ...

Senior React Native & Mobile Tech Lead Remote

A leading tech recruitment agency in Spain is seeking an experienced Mobile Software Developer with over 8 years in software development and 2 years as a Tech Lead. Responsibilities include architecting large applications using React Native, supporting development teams, and maintaining mobile libraries. The pos ...

Software Engineer II: Build Scalable, High Impact Systems

Ookla, an Accenture company, is seeking a Software Developer II to join a collaborative engineering team. You will design, develop, and maintain high-quality software powering our products and platforms across backend services, web apps, APIs and data platforms. You will work on complex technical chall ...

Remote Scala Engineer — Fintech Platform & Kafka

Bitrock is seeking a State-of-the-art Scala Developer Freelance to join a fintech company specializing in structured investment products. This remote role in the CET zone offers a chance to contribute to a leading digital marketplace for structured products and services across the value chain from development ...

Programador Full Stack

¿Te motiva trabajar en plataformas empresariales de alto impacto a nivel internacional? Si desea conocer los requisitos para este puesto, siga leyendo para obtener toda la información relevante.En Hays, estamos buscando un/a Senior Full Stack Developer (Angular / Java) para un proyecto tecn ...

Senior Full Stack Developer (1 Día De Oficina Por Semana) Barcelona · Completamente Remoto

¡Estamos contratando! | Senior Full Stack Developer (Angular + Java) Desplácese hacia abajo para ver todos los requisitos del puesto y las responsabilidades que pueden esperar los candidatos seleccionados.Barcelona (Modelo híbrido – 1 día de oficina por semana) ...

Senior Product Security Engineer

Joining Collibra’s Product Security team Collibra is seeking a Senior Product Security Engineer to join our high-impact team. You will be a key individual responsible for identifying vulnerabilities and providing expert remediation consulting for our global product development teams. This role pr ...

Senior Backend Arquitecto de software

WAME es la red social de deportistas del sector amateur con una misión clara: que todo joven deportista alcance su máximo potencial. A través de nuestra plataforma, los jugadores disfrutan de vídeos de partidos, comparten highlights, siguen estadísticas y construyen su CV digital. Con oficinas en Es ...

Investigador/a en Tecnologías de Datos para Movilidad Autónoma (CCAM)

Vicomtech ( es un Centro privado de Investigación Aplicada especializado en Inteligencia Artificial, Visual Computing e Interacción situado en Donostia-San Sebastián y Bilbao y con fuerte presencia nacional en la aplicación de tecnologías de Inteligencia Artificial punteras en múltiples sectores. S ...

Desarrollador/a Java

Comparte tu experiencia como desarrollador/a back Java (backend) en un proyecto dentro de una multinacional del sector seguridad . En ALTEN tenemos claro que el éxito de nuestros proyectos se debe a las personas que forman nuestro equipo. Por eso, si tienes experiencia como desarro ...

Desarrollador/a React Senior Entorno Microservicios

¡En Ayesa Digital crecemos Contigo! Cada profesional de nuestra empresa es importante para nosotros, nos ayudan a crecer de manera diversa y gracias a ellos somos 11.000 personas trabajando con el mismo objetivo en 10 países. Si eres una persona entusiasta y buscas un nuevo re ...

Senior Devops Engineer (Azure/.Net) — Remote & Secure Ci/Cd

UST is seeking a DevOps Toolchain Engineer to design, operate, and evolve enterprise DevOps capabilities across CI/CD, source control, deployment tooling and security scanning. You will collaborate with developers, security, audit, and compliance teams to build secure, scalable DevOps services that improve devel ...

Senior Genai & Agentic Ai Engineer

Qaracter - Beyond Your Challenge busca un/a Senior Agent Developer para liderar el diseño, desarrollo e implantación de soluciones de Inteligencia Artificial Generativa y Agentic AI en proyectos del sector financiero.Formarás parte de un equipo innovador donde trabajarás en la construcción de agentes intel ...

Senior Full Stack Engineer: Real Time Data & Angular/Java

Qaracter - Beyond Your Challenge busca un/a Senior Full Stack Developer (Angular & Java) para un proyecto internacional de gran impacto, trabajando en el desarrollo de aplicaciones de alto rendimiento y soluciones orientadas a datos en tiempo real.Formarás parte de un equipo multidisciplinar donde particip ...

Senior Rails Engineer: Scalable Web Apps & Apis

A leading tech company in Comunidad de Madrid is seeking an experienced Senior Ruby on Rails Developer. Responsibilities include designing and maintaining web services and applications, collaborating with mobile and QA teams, and managing databases. The ideal candidate has over 5 years of experience with Ruby on ...

Ingeniero Backend Node.js – Impacto Real en Producto

The Adecco Group busca un/a Backend Developer Node.js para su equipo de I+D en Málaga, con enfoque en servicios backend robustos y escalables. Se valoran 2 años de experiencia en Node.js, APIs REST y conocimientos de AWS, MongoDB y frontend (Vue/React). La posición ofrece jornada completa con entrada f ...

Programador full stack

¿Te motiva trabajar en plataformas empresariales de alto impacto a nivel internacional? En Hays, estamos buscando un/a Senior Full Stack Developer (Angular / Java) para un proyecto tecnológico puntero, dentro de una plataforma digital crítica utilizada por miles ...

Analista Programador Java / SpringBoot

¡Estamos buscando un/a Programador Seniorespecializado en microservicios con Spring Boot ! ¿Tienes más de 5 años de experiencia en desarrollo con SpringBoot? ¡Este puesto es para ti! Desarrollo de microservicios con Spring Boot, asegurando rendimiento, escalabilidad y calid ...

Administrador/a Sistemas AWS/Linux — Micro Focus

IT Talent Acquisition & Team Lead | Driving Agile Recruitment & People Growth at PSS Tecnologías de la Información ¿Te gustaría impulsar tu carrera en el sector IT con un proyecto sólido y un equipo de profesionales excepcionales? Si valoras la estabilidad y el crecimiento profesional, es ...

LabWare LIMS Applications Engineer — Career Growth

CTI in the Basque Country seeks a LIMS Software Developer to implement and maintain LabWare LIMS within the SDLC. You will build databases, user interfaces, and reports using LIMS Basic, Smalltalk, Postgres, SQL, Crystal Reports, and pgAdmin. The ideal candidate holds a Bachelor's degree in computer sc ...

Remote friendly Senior AI Native Full Stack Engineer

Plexus Tech busca un Senior Full Stack Developer (AI-Native) para unirse al equipo y liderar proyectos reales y complejos con impacto. Se valorará experiencia en Java, Spring Boot, Angular, microservicios y prácticas de DevOps en la nube. Se requiere dominio de IA aplicada y habilidades de ingeniería d ...

Senior FinTech Full Stack Engineer (Hybrid Madrid)

Shakers in Madrid is seeking a Senior Full Stack Software Developer to own core systems of a next-generation FinTech platform. This hands-on role involves customer-facing portals, backend services, and API design, with two days a week onsite in Retiro. You'll collaborate with product, data and business ...

Desarrollador Senior

Desde Kapres Technology estamos buscando un desarrollador senior para trabajar con nosotros para un cliente internacional de logistica. Formación de varias squads para el desarrollo, mantenimiento y evolución de un sistema de gestión interno para una empresa internacional de logística.< ...

Remote Java Backend Engineer for 365 APIs & Platforms

UST es una multinacional norteamericana, Top Employer y Great Place to Work, con presencia global. Buscamos un/a Java developer para evolucionar y mejorar plataformas de Marketplace Servicios TI y Microsoft 365, colaborando en proyectos estratégicos para un líder de telecomunicaciones. El puesto ofrece ...

Backend Engineer Java, Spring Boot, AWS

adesso Spain is seeking a Backend Developer / DBA to join our international team. You will contribute to a mission-critical data platform handling millions of transactions daily, collaborate with architects and senior engineers, and occasionally travel to Germany. Key requirements include Java and Spri ...

Senior Backend Engineer Java & AI Driven Microservices

Softtek busca un Senior Backend Developer para un entorno tecnológico de gran escala en Madrid. Se valorará experiencia con Java 17/21, microservicios, APIs REST, Kafka y bases de datos como MongoDB y PostgreSQL. Se prioriza conocimiento de Spring Boot, DDD, SOLID y sistemas distribuidos, con enfoque e ...

Senior Frontend Dev: Generative AI & React(Hybrid Valencia)

Vortech PCI Group busca un Senior Frontend Developer para un rol en Valencia, liderando el desarrollo de aplicaciones React e IA Generativa. Trabajarás en una plataforma de Agentic AI para integraciones en tiempo real con agentes basados en modelos de lenguaje. Se valoran más de 5 años de experiencia, ...

Desarrollo de Negocios Global — Pasantía Internacional

Venair busca un/a Business Developer para una estancia internacional de aproximadamente 6 meses en Terrassa. La formación abarca distintas áreas y, tras esa fase, se asignará un proyecto internacional en una delegación comercial en el extranjero. Se requiere formación en Marketing, Gestión, Dirección d ...

Fleet Growth Architect for Electric Mobility Expansion

Zunder, líder en movilidad eléctrica, busca un Fleet Business Developer para impulsar la expansión en España y filiales internacionales. Ubicación en Madrid con flexibilidad de ubicación (Palencia) y presencia habitual en oficinas. Se trabajará en un entorno dinámico y orientado a resultados, con auton ...

Senior Backend Architect – AI Driven CRM & LLM

Biorce, a Healthtech innovator, is seeking a Senior Backend Developer (Delta Team) to build and scale our internal software infrastructure from Barcelona. You will own Leadro’s backend, APIs, and data flow, while integrating with GTM tools and external systems. The role demands ownership, architecture, ...

Senior .NET Full Stack Engineer – Healthcare Platform

Materialise Medical is seeking a Senior Full-Stack Developer to help build Mimics Workflow, a standalone service within our case management platform for personalized patient care. You will work across the stack, delivering scalable backend services in .NET Core and front-end interfaces in React with TypeScrip ...

Hybrid Android Engineer – Flutter & Kotlin

T-Systems Iberia is seeking an experienced Android mobile developer to join our team in Madrid. You will contribute to a digital management and documentation platform for telecom infrastructure, working across Flutter, Kotlin, and native Android technologies. The role emphasizes feature development, ar ...

Senior SAP ABAP Techno Functional Consultant

Tata Consultancy Services in Madrid is seeking a dynamic SAP ABAP Developer to join our hybrid team. You will develop and maintain SAP applications, work across LO-AB, SD, MM, and FI modules, and translate business requirements into technical specifications. This role requires 8+ years of SAP experienc ...

Italian Market Partner Growth Manager

Factorial HR is seeking a Partner Business Developer for the Italian Market to propel partnerships and unlock new business opportunities. You will build meaningful alliances, support Partners, and align activities with the Partner Sales team. The role requires a native Italian speaker with English at B ...

Senior Android Engineer (Flutter/Kotlin), Hybrid & Growth

T-Systems Iberia is hiring for an Android mobile developer to enhance our Android apps and enterprise mobile solutions. You will collaborate with product owners and cross-functional teams to design, develop, and improve our Android applications, applying Flutter and native Android technologies as appropriate. ...

Platform Architect — AI‑Driven SDLC Leader

dLocal is seeking a Platform Engineering Technical Referent in Spain to lead the design, build, and evolution of an internal developer platform, AI-native SDLC, and automated delivery stack. You will guide 60+ eng teams, drive best practices, and mentor a multi-disciplinary team. You will champion Kube ...

Senior SRE — Global Remote, Scalable Systems

Fountain is a leading enterprise solution for frontline workforce management, powering millions of workers across 75+ countries. We are seeking a Site Reliability Engineer to own reliability, scalability, and observability of our platform. You’ll design Kubernetes-based infra, manage AWS, improve CI/CD ...

Senior Full Stack Engineer (React/TypeScript) Barcelona

Talent Insights está buscando un/a Senior Full Stack Developer (React, TypeScript) para reforzar el equipo de Engineering en Barcelona, trabajando en aplicaciones web críticas y servicios backend de alto impacto. Se requiere al menos 4 años de experiencia, habilidades en React y REST APIs, y experienci ...

Senior Talent Consultant & 360° Biz Dev – Engineering

ManpowerGroup busca un Senior Talent Consultant/Business Developer 360º, especializado en INGENIERÍA, para la zona de Barcelona. Incorporarse a la estructura de Manpower España para impulsar negocio y procesos de selección para clientes de referencia. Se solicita experiencia 360º, prospección de nuevos ...

Senior Front End Designer — React/TypeScript + Next.js

Omega CRM Consulting, a Merkle company and part of the dentsu group, seeks a Front-End Designer / React Developer to design, build, and evolve frontend applications in collaboration with cross-functional teams. You will contribute to architecture decisions, write clean TypeScript/React code, and ensure ...

Senior Agentic BA | Automation & AI Lead (Hybrid)

Ciklum in Málaga, Spain, is seeking a Senior Agentic Business Analyst to join a cross-functional team on a global payments platform. You will map end-to-end processes, assess automation opportunities, and translate business needs into developer-ready specifications. Role spans RPA, IDP, and Agentic AI, ...

Senior Java Backend Engineer – Digital Transformation Hub

Festo is seeking a Senior Backend Java Developer for its Digital Innovation Hub. You will work on a cutting-edge stack including Spring Boot, React, and AWS, taking ownership of technical design within an informal, agile environment. You will help translate business needs into scalable software and gui ...

Senior Full Stack & Cloud Architect (AI/XR)

Grupo Crit busca un Senior Full Stack Developer para liderar técnicamente entornos cloud en un cliente en Lleida. El rol requiere visión de producto, capacidad para entender plataformas existentes y guiarlas hacia su evolución tecnológica, con foco en IA, XR e IoT. Entre las responsabilidades están dir ...

Full Stack Engineer (Angular + Java) HealthTech Impact

NTT DATA Europe & Latam en Barcelona busca un/a Ingeniero/a Full stack especializado/a en Angular y Java para crecer profesionalmente participando en proyectos estratégicos de gran impacto en el sector sanitario. Tendrás la oportunidad de trabajar en diferentes proyectos, contribuyendo con soluciones digitale ...

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    Fullstack Javascript Developer Jobs in Spain Job Search Guide, Trends and Insights