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

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Python Django App Owner — Risk & Control Solutions

UST España & Latam is seeking an Application Owner / Python Developer for a banking sector client in Madrid. The role involves designing, developing, and supporting business-critical Python applications with Django, taking end-to-end ownership, and coordinating across business, development, and infrastructure ...

Staff UI Platform Engineer BFF Architect

Stripe’s UI Platform Sail team is seeking a Staff Software Engineer to shape the technical direction for services powering Stripe’s dashboards and developer tools. You will blend hands-on coding with technical leadership across squads to deliver scalable, reliable experiences for Stripe’s user interfaces. </p ...

Remote Freelance SAP AI Architect & Generative AI Expert

Timestamp is seeking an experienced SAP AI Developer / SAP Business AI Consultant to design, develop, and implement AI-powered solutions within the SAP ecosystem. The role focuses on SAP BTP, SAP AI Foundation, SAP AI Core, Joule, and Generative AI, aligning with enterprise processes and governance. Re ...

Senior Front End Designer — React/TypeScript, Remote

Omega CRM Consulting, a Merkle Company and part of dentsu, is seeking a Senior Front-End Designer/React Developer in Spain to design, develop, and evolve frontend applications. You will influence architecture decisions, code quality, and the delivery of new features within a collaborative team. The rol ...

R&D Internship: Real Time 3D GIS & Maps SDK

Esri in Barcelona is seeking an intern to work on the ArcGIS Maps SDKs for Native Apps and Game Engines. This role involves collaborating with development teams, building prototypes, and contributing to high-quality developer technology. The ideal candidate is a final-year student in computer science o ...

Senior Full Stack Java/Angular – Remote Spain | AI SDLC

Talan Group in Spain is seeking a Senior Full Stack Developer to join a collaborative Agile team. You will design and deliver enterprise applications, using Java, Spring Boot, Angular, and REST APIs, with a focus on scalability, security, and AI-enhanced development across the SDLC. This role offers a ...

Senior Java Cloud Engineer Remote (AWS, Spring)

UST is seeking a Senior Java Developer to join a highly innovative team operating in a microservice-based cloud environment within the utility technology sector. You will design and implement Java services, REST APIs, and extensions using Java/Spring, translating business needs into clean, scalable code. ...

Senior Full Stack Tech Lead (Java/Angular) – Hybrid Madrid

La empresa Zemsania Global Group busca un Senior Full Stack Developer / Technical Leader para unirse a su equipo en Madrid. Se requiere experiencia en Java/Angular, arquitectura de microservicios y liderazgo técnico para guiar equipos de desarrollo en proyectos innovadores. La posición es híbrida (3 dí ...

Remote First AI Native Full Stack Engineer

Leadtech Group is seeking a talented Full-Stack Developer to help build and scale AI-driven platforms. You will work across our technology stack to deliver seamless user experiences, joining projects with a shipping-fast approach and modern tools. The role involves developing frontend and backend featu ...

Senior SAP Fiori Architect & Full Stack Tech Lead

Infosys Limited is seeking a Senior Technology Architect/SAP Fiori Developer in Spain to lead the design, development, and deployment of SAP Fiori solutions. You will drive architecture decisions, coordinate with stakeholders, and mentor offshore teams to deliver end-to-end SAP UI5/Fiori implementations lever ...

Thermal Growth Strategist – M&A & Partnerships Lead

Alpiq AG in Madrid seeks a Strategic Growth Thermal - Business Developer to identify and advance acquisition and partnership opportunities for thermal assets within the group’s growth agenda. You will engage with internal stakeholders and external partners to move opportunities through the deal process. < ...

Engineering Manager – Cloud Foundations & Runtime Platform

N26 in Barcelona seeks an experienced Engineering Manager to lead the Cloud Foundations team within Platform Engineering. You will shape the core architectural bedrock of the cloud platform, owning strategy, execution, and organizational design to scale baselines, container orchestration, networking, and secr ...

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 ...

Renewable Energy Land Acquisition Lead – Italy

Taylor Hopkinson is partnering with a well-established international renewable energy developer to identify a Land Acquisition Specialist for its growing Italian business. You will manage the end-to-end land acquisition process in Italy, engaging with landowners, negotiating contracts and coordinating with te ...

Senior Unity Architect Drive Mobile Game Tech & Tools

King is seeking a Senior Unity Developer to join the Catalog Games team in Barcelona, contributing to Unity-based title maintenance and migration from C++ to Unity. You’ll collaborate with engineers, designers, and producers to shape technical evolution and player experiences. Responsibilities include ...

Senior Backend Engineer Python/Django, Hybrid

bsport is hiring for an OpsEng engineer within the Platform Organization. You will own architecture and delivery of client onboarding and data migrations, and help scale deployments for our branded mobile apps. You’ll design internal tooling and libraries used across engineering, and drive decisions wi ...

Remote .NET Backend Engineer | Microservices & REST APIs

Publicis Groupe Spain is seeking a .NET Backend Developer to join our technology teams in Madrid. You will design, develop and maintain backend services using C# and .NET, contribute to microservices architectures, and build RESTful APIs for our strategic platforms. The role requires 2+ years of experi ...

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 .NET/Angular SaaS Engineer — Remote Spain

atwork.ai is seeking a Senior Developer to own end‑to‑end web applications on a multi‑tenant B2B SaaS platform. You will code across the stack, review peers, and shape architectural decisions while ensuring quality through automated tests and solid documentation. You will contribute to Azure-based infr ...

Senior React Frontend Engineer (TypeScript)

Altia in Madrid is seeking a Senior React Developer to join a European agency project and build modern frontend solutions. You will work with an international, multidisciplinary team and contribute to scalable front-end systems. The role requires 5+ years of frontend experience with React and Typescrip ...

Frontend Engineer Secure Banking React UI

DKB Code Factory in Valencia is seeking a Frontend Developer React to join our team building secure, high-performance banking interfaces used by millions. You will own end-to-end features and help shape frontend foundations. You will work with Product, Design, Backend, and QA, ensuring regulatory compl ...

Senior Scala Backend Engineer Remote (EU) with Ownership

HHHub.eu (Taupai, UAB) is seeking a Senior Scala Backend Developer to design and build backend services that process financial operations, events, and projections. You will join a four-engineer team, shaping the architecture of a new FinTech product while improving the reliability and performance of the exist ...

FenX Fenergo Config Engineer – Hybrid Madrid

Ebury Madrid Office is seeking a FenX (Fenergo) Developer to design and implement CLM configurations, focusing on AML, ID&V, and Ongoing Due Diligence. This hybrid role features 4 days in the office and 1 day remote weekly to support global client onboarding and compliance objectives. You will collabor ...

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 ...

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 ...

Fintech Backend Engineer: Payments, Ledgers & APIs

Rehive is building the platform that lets fintechs launch with reliable ledgers, stablecoin integrations, and developer-friendly APIs. You will design and implement backend services that handle financial transactions and ensure system reliability at scale. You will work with PostgreSQL, focus on data c ...

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 BI Architect (Remote EU) – Power BI & AWS QuickSight

An international client is seeking a Senior BI Developer/Architect to join their remote team. This role involves designing and maintaining business intelligence solutions using AWS QuickSight and Power BI. Candidates should have extensive experience in BI development, strong SQL and data modeling skills, and a s ...

Senior Software Engineer Algorithm Integration & Cloud

Between Technology, empresa multinacional de ingeniería y TI, busca un Senior Software Developer para algoritmo integration y cloud deployment en Bilbao, con modalidad híbrida (1-2 días de teletrabajo). Te unirás a un equipo internacional y colaborarás con análisis de datos e ingeniería para transformar algor ...

Staff TPM: Lead Cross‑Team Platform & Reliability

Fever is seeking a Staff Technical Program Manager in Madrid, Spain, to lead high-impact technical programs across multiple engineering teams, focusing on platform modernization, M&A integrations, and improving developer experience. The ideal candidate will have over 7 years of experience in technical program ma ...

Senior React Frontend Engineer — HealthTech Growth & Impact

Impress, Europe’s leading health-tech innovator, seeks a Senior Frontend Developer to join our onsite team in Barcelona. You’ll own multiple React frontends and shape internal tools to power a fast-growing ortho clinic network. Bring 5+ years of frontend experience, mastery of React and TypeScript, and ...

Senior Backend Engineer for AI Microservices

Tata Consultancy Services in Madrid is seeking a Senior Backend Developer for AI initiatives. You will build backend solutions, design scalable services, and maintain REST APIs with microservices architecture. The role requires 4–8 years of experience and Spanish nationality, with hybrid work from Geta ...

Hybrid AI Full Stack Engineer for Global Platform

Allianz Technology is seeking an AI Full Stack Developer for the BMP, a global platform transforming how Allianz operates. You will design and build AI-enabled apps across frontend, backend, and data layers, using Angular, TypeScript, Java/Spring Boot, and REST APIs. The role offers a hybrid work model and op ...

.NET Applications & API Integration Engineer

Apex Group Ltd is seeking a highly skilled Applications Developer with expertise in .NET technologies to join our IT team in Madrid. The role focuses on developing and maintaining integrations between diverse business applications to streamline operations and improve data flow across systems. The ideal ...

Hybrid Software Engineer: Build scalable, user focused apps

TecAlliance in Tenerife invites a Software Developer (m/f/d) to join our international team. You will develop, maintain and enhance software solutions, analyze requirements, write clean code, test, debug and participate in reviews to improve performance and reliability. You will work in a hybrid setup, ...

Senior BI Analytics Architect — Hybrid

Hexagon Infrastructure & Geospatial in Barcelona seeks a Senior BI Developer to design, build, and deploy semantic BI models and dashboards that empower data‑driven decisions. You will translate business needs into technical specs, collaborate with IT, and guide users on BI tools. With 5+ years in BI d ...

Senior Scala Backend Architect

A fast-growing global programmatic exchange is seeking a Senior Scala Developer to design, implement, and maintain highly scalable backend services. The ideal candidate has solid hands-on experience with Scala and proficiency in SQL databases, particularly PostgreSQL. The role involves collaborating with cross-f ...

Senior Product Engineer — AI Driven, Multiplatform Systems

Leadtech Group is hiring a Full Stack Developer in the UK to build and manage core multiplatform systems. You'll work with React and Node.js, design AI workflows, and collaborate closely with teams across technology and product development. With over 18 years of experience in digital products, you'll join a remo ...

Desarrollador/a Senior de Negocios – Lujo (Hunter)

Una empresa de interiorismo de lujo busca un/a Business Developer Senior con experiencia en el segmento lujo. El candidato ideal tendrá un perfil Hunter y será responsable de generar negocio de forma proactiva, desarrollando relaciones estratégicas y captando nuevas oportunidades. Se requiere un alto nivel en al ...

Senior Full Stack Engineer: Microservices, Cloud & Leadership

ISANDO TECHNOLOGIES in Barcelona, Spain, is seeking a senior software developer to join our software development team. You will work on full‑stack solutions using Java or Node.js, RESTful services, and cloud platforms, delivering impact to users. The role emphasizes microservices, API design, Agile Scr ...

C# & .NET Lead for Desktop & Embedded Systems

FluxPose is seeking an experienced software developer to join our team in Logroño. You will design, build, and maintain desktop applications and internal tools in C# and the .NET ecosystem, working closely with hardware products and embedded software teams. The role is hands-on with significant autonom ...

Aerospace Data Tools Engineer (Hybrid)

Airbus Defence and Space SAU is seeking a Methods & Tools Software Developer to join the Data Processing and Analysis Development group within the Ground Station Team. You will build, optimize, and maintain software tools used to analyze test data and support the Spain-based analysis community. The rol ...

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