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Krell Consulting & Training

Senior Backend Developer Java | Spring Boot, Kafka y Microservicios

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Senior Java backend developer joining an insurance-sector project in Barcelona on a hybrid model (1-2 office days per week). Day to day: designing and building backend microservices with Java, Spring Boot, Kafka and MongoDB in an event-driven architecture, plus architecture decisions and technical documentation within Agile/Scrum.

Agile Angular API Cloud Git +11 skills

Senior Backend Developer - COBOL (Mainframe) | Flexible Hours

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Senior backend developer building and maintaining core banking applications in mainframe environments for a leading bank, working day to day with COBOL, DB2, z/OS, JCL and CICS. The role is in Spain with remote work options, flexible hours, and a permanent contract.

COBOL Db2 Jcl Mainframe

Senior Backend Developer: APIs, Java & Azure DevOps

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Senior Backend Developer at HCLTech in Spain building robust, API-driven services and scalable backend solutions. Day to day involves architecture, implementation, and testing across the stack, focusing on API composition, data access layers, and cloud-native Java work (Maven, JPA, Oracle, JDBC) with CI/CD via Azure DevOps.

API Azure Azure DevOps CI/CD Cloud +6 skills

NTT DATA Europe & Latam

Senior Java Backend Developer — Spring | REST Expert

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NTT DATA Europe & Latam is hiring a senior Java back-end developer (hybrid) for IT projects. Day to day centers on building Spring-based services with SOAP/REST APIs and JPA/Hibernate persistence on Oracle databases, plus some web front-end integration (HTML/CSS/JS, jQuery, AJAX, Bootstrap). Permanent contract offered.

AJAX Bootstrap CSS Hibernate HTML +5 skills

NTT DATA Europe & Latam

Senior Java Backend Developer | Spring & REST, Hybrid Madrid

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NTT DATA Europe & Latam is hiring a senior Java back-end developer to build Spring/REST services for Spanish public-sector IT projects. Day-to-day work centers on Java with Spring, Oracle databases, and web technologies like HTML/CSS/JavaScript, with some remote work options.

AJAX Bootstrap CSS Hibernate HTML +6 skills

Decskill España

Global Backend Developer | Multinational IT Solutions

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Backend developer role at Decskill España, an IT consulting multinational (part of Grupo Astek) with 800+ professionals, based onsite in Valencia, Spain. The posting does not specify the tech stack or day-to-day duties.

PrimeIT España

PHP/Symfony Backend Developer — Hybrid Madrid

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PrimeIT España is hiring a backend PHP developer in Madrid (hybrid, with some telework options) to build scalable APIs and services alongside international teams. Core stack is PHP/Symfony; React, relational databases, cloud, Docker and CI/CD are valued. Offered salary is €35k–46k.

API CI/CD Cloud Docker PHP +2 skills

35K – 46K €

Axpe Consulting

Remote Java Backend Developer | Microservices & AWS

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Axpe Consulting is hiring a senior Java Backend Developer to build and evolve critical applications using Java 21, Spring Boot, and microservices. Day to day you implement REST APIs, work with AWS and PostgreSQL, and apply testing and DevOps practices in Agile/Scrum teams, 100% remote from Spain.

Agile API AWS DevOps Java +3 skills

Decskill España

Backend Developer L Multinacional Tecnológica

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Senior backend developer joining the founding team of a new Generative AI hub in Valencia, building an enterprise Agentic AI platform on Azure. Day to day: design backend services and APIs with Node.js or .NET 8, build data ingestion and embedding pipelines, vector search, and agent tooling (LangChain, LangGraph, FastAPI) on Azure services like OpenAI, Cognitive Search, Cosmos DB and SQL.

Agentic AI AI Analytics API Azure +14 skills

Senior Backend Developer-Java

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Senior backend Java developer at ALTEN Spain: design, build and maintain Spring Boot 3 microservices with event-driven Kafka integration, PostgreSQL/Hibernate data access, automated testing and AWS CI/CD. Hybrid role based in Madrid (2 days onsite per week) at a large multinational engineering and IT consulting firm.

API AWS CI/CD Cloud Docker +13 skills

Lead Agent Developer | Python & GenAI | Remote

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UST, a US-based digital technology services multinational, is hiring a Lead Agent Developer to build advanced AI agent solutions using Python and GenAI. The role collaborates with business, data, and tech teams to automate processes and can be done 100% remotely from Spain.

Generative AI Python

Krell Consulting & Training, S.L.

Python Developer with MongoDB | On-site in Sevilla

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Develop stable business-process and complex-calculation solutions with Python and MongoDB in a collaborative team, on-site in Sevilla under a permanent contract. The role values process optimization and good development practices.

UST España & Latam

Madrid-based Python Developer & Application Owner

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Designs, develops and maintains a critical banking application handling risk data, controls and report generation, acting as its application owner and coordinating business, dev, infra and external vendors. Hybrid role in Madrid (3 days office / 2 WFH) using Python, Django, SQL, Celery, Redis and CI/CD.

CI/CD Django Python Redis SQL

Experis España

Remote Python Developer: Cloud Automation using Terraform

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Experis España is hiring a Python developer with 1-2 years' experience for an IBM Cloud automation project: building a Flask API, automating deployments with Terraform, and integrating it into Jenkins CI/CD pipelines across cloud and microservices environments. Hybrid role in Madrid or Barcelona with 1-2 office days per week.

API CI/CD Cloud Flask Jenkins +2 skills

Senior Python Developer — 100% Remote & Flexible Hours

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Plexus Tech in Málaga is hiring a Senior Python Developer for a 100% remote role with flexible hours and a permanent contract. Day to day the person works on enterprise tech projects using Python, with valued experience in SQL databases, CI/CD pipelines, and microservices.

CI/CD GitHub GitHub Actions Jenkins Oracle +4 skills

Desarrollador Python Backend - Arquitectura de Eventos

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Build and evolve Python backend services for an event-driven internal platform supporting the AI team of a renewable-energy client in Barcelona, managing RabbitMQ queues and consumers and containerizing services with Docker.

AI Docker Event Driven Architecture Python RabbitMQ

Desarrollador Frontend Senior

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Senior Frontend Developer at Aubay Spain in Barcelona (hybrid: 3 days remote, 2 on-site near Bogatell metro), building and maintaining web applications with Angular and React. Core stack: TypeScript, REST API integration, asynchronous programming, and automated testing with Playwright; advanced English required for an international team.

Agile Angular API CI/CD Cloud +5 skills

Desarrollador Java con CI/CD | Backend en Madrid (Híbrido)

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Grupo Oesía is hiring a Java backend developer in Madrid (hybrid) to build and maintain backend applications, support teams, and evolve the architecture using Jakarta EE and CI/CD. Requires at least 4 years of Java experience in high-availability environments.

UST España & Latam

Senior Java Backend Dev | Hybrid Madrid | Training Benefits

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Mid/senior Java backend developer at UST building software for a global wealth-management client. Day to day: develop and test backend services in Java, with REST, Oracle SQL and Kafka experience valued; hybrid schedule in Madrid (3 days office, 2 remote) and paid training on the Actico platform.

Java Kafka Oracle SQL

Desarrollador Backend Node.js — Híbrido en Barcelona

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Build backend services with Node.js (REST APIs, Jest testing) on an international team in Barcelona, working in hybrid environments that also use Python and Angular on CRM and AI projects. Permanent contract with flexible hours, hybrid setup and some remote options.

Angular API CRM Jest Node.js +1 skills