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Senior Software Engineer
Senior Software Engineer in Seqera Labs' Unified Compute team (Barcelona) owning the application layer behind compute provisioning (AWS, Azure, GCP, Kubernetes, HPC, GPU) and usage metering/billing for the Seqera Platform. Day-to-day is JVM backend work in Java/Groovy with Micronaut: data models, APIs, cloud integrations and billing.
Staff Software Engineer
Staff Software Engineer at Sanofi in Barcelona (hybrid) shaping technical strategy for the company's global eCommerce platform that connects patients and healthcare professionals to medicines and vaccines. Day to day: driving architecture and standards across teams, mentoring senior engineers, and building cloud-native microservices with Node.js/TypeScript, React, Java/Python, AWS/GCP/Azure, CI/CD
Senior Full Stack Developer with.NET & Angular (Hybrid - Madrid)
Senior full stack developer designing, building, and maintaining scalable applications with .NET/C# and Angular for an international financial-services client. Works on REST APIs, SQL databases, CI/CD and architecture decisions in Agile, hybrid from Madrid with 3 days/week on-site at the client's central Madrid offices.
Java developer in mobility
Backend Java developer on Indra's Mobility team in Barcelona, building middleware for transport and ticketing systems: real-time system integrations, REST APIs, WebSocket and MQTT communications, hardware/driver integration, automated tests and CI/CD pipelines.
Software Engineer
Backend-leaning full-stack engineer at a profitable AI travel startup building a luxury travel booking platform (hotels, villas, yachts, private flights). Day to day: Python/FastAPI supplier integrations, PostgreSQL data architecture, Redis/GCP infra, and LLM-powered search, plus some React/TypeScript. Remote UK/EU, £65-85k + equity.
Backend Go Developer
Backend Go Developer at Gainrep (part of Alkemy Group, a Madrid-based digital consultancy) designing, building, and maintaining Go microservices and RESTful APIs. Day to day involves integrating services with frontend teams, debugging production issues, writing tests, doing code reviews, and joining Agile sprint planning.
Fullstack Developer Java / Python Con Inglés
Software engineer (hybrid, Barcelona) designing and building scalable Java Spring Boot microservices with MongoDB for enterprise systems, potentially in the airline domain. Day-to-day work spans API integration, testing, performance tuning, and collaborating with product and DevOps teams in an international environment; the title also cites Python and English.
Full Stack Developer
Senior full stack developer, fully remote (must be based in Spain), for a software solutions provider's globally distributed team: design, build, test, and maintain web applications end to end with a modern front-end framework (React/Angular/Vue) and a back-end like Node.js, Python, or Java, plus REST APIs, cloud/Docker, and CI/CD, while mentoring juniors in an Agile environment.
Backend Developer (Kotlin/Spring Boot)
On-site backend developer in Huelva, Spain, building and maintaining robust, scalable enterprise applications with Java and Spring Boot in an agile team. Day to day: designing secure RESTful APIs, working with PostgreSQL/MySQL via Hibernate, code reviews, testing, deployment, and performance tuning.
PHP backend developer in adtech
PHP backend developer on Tappx's SSP Tech team in adtech: designs, builds, and maintains high-scalability SSP platforms and internal tools, owning the full lifecycle from technical design through production deployment and monitoring. Core stack is PHP with MySQL, plus API integrations, frontend basics, automated tests, and CI/CD.
Cloud Developer (Python) — Google Cloud Platform
Cloud Developer (Python) who designs, builds and operates GCP-native backends: REST APIs on Cloud Run/Cloud Functions, event-driven flows with Pub/Sub/Cloud Tasks, client system integrations, Cloud SQL/Firestore persistence, Docker CI/CD, and generative-AI features. Hybrid role in Madrid; also supports pre-sales estimates and PoCs.
Process Automation Developer (Python/AWS)
Builds and maintains serverless process-automation solutions in Python on AWS (Lambda, EventBridge, S3, CloudWatch), orchestrating event-driven workflows, integrating internal/external APIs, and querying MySQL, Postgres, and Snowflake. Works in a cross-functional team split between Spain and Germany.
Process Automation Developer (Python/AWS)
Designs, builds, and maintains event-driven process automation on AWS serverless services (Lambda, EventBridge, S3, CloudWatch) using Python, integrating external/internal APIs and databases (MySQL, Postgres, Snowflake). Uses CI/CD, Terraform, GitHub, and Podman; Node.js and AWS Bedrock/GCP Vertex are a plus.
Python Developer
Backend developer at Paradigma Digital in Madrid building fast, robust, observable APIs with Python and Django. Day-to-day focuses on API and PostgreSQL performance tuning, caching with Redis/Valkey, async tasks with Celery, observability via OpenTelemetry/Datadog, GitLab CI/CD pipelines, and AI-assisted coding tools like Claude Code.
Backend Developer (C.NET)
Backend developer building custom integrations in C#/.NET that connect third-party systems with SKIDATA's access solutions — owning projects from design through testing and documentation, working with APIs like REST, SOAP, gRPC and RabbitMQ, and supporting integration partners. Based in Madrid (hybrid).
AI Engineer / Backend Developer
Backend/AI engineer at Mindsight Ventures (Barcelona, hybrid) building AI-driven systems and backend infrastructure for internal and client projects: designing APIs and data pipelines, deploying ML models with MLOps, and scaling on cloud (Azure preferred) using Node.js/TypeScript or Python, Docker, and modern RAG/vector-DB patterns.
Senior Backend Developer
Senior Backend Engineer for an AI-native SaaS platform near Barcelona: designing and scaling distributed, high-availability backend services with Django/Python and PostgreSQL, integrating external APIs, and strengthening observability, testing, CI/CD and team engineering standards. Hybrid role with 2 required office days per week.
Java backend developer
K-LAGAN is hiring a Java backend developer in Barcelona to work on international logistics and intralogistics automation projects, building and integrating WMS/WCS solutions. Day-to-day work involves Java 17 and Spring Boot services, REST APIs, Oracle/SQL databases, and testing with JUnit/Mockito, with travel to project sites for commissioning.
Backend Developer In Healthtech
Senior backend developer at Biorce's Barcelona hub building and owning core backend services for Leadro, an AI-powered drug-development platform — data models, APIs, GTM integrations, and LLM/agentic features. Core stack: Node.js/NestJS, TypeScript, PostgreSQL/BigQuery, and GCP, in a hybrid work model.
PHP Backend Developer
PHP Backend Developer at Tappx, an AdTech firm in Spain: design, build, and maintain highly scalable SSP products and internal PHP tools, owning the full system lifecycle from design to production monitoring. Works with PHP, MySQL, NoSQL/Redis, CI/CD, and AI tools; hybrid in Barcelona/Madrid or 100% remote within Spain.