100 backend developer English-speaking jobs in Catalonia

Senior Backend Developer will design, develop, test, deploy, and maintain software using a JVM language and Spring Boot in large-scale production systems. Experience with relational and non-relational databases, preferably Postgres, and AWS is required.

Tasks / Main ActivitiesDevelop backend components using Spring Boot, ensuring scalable and resilient ... Position: Java Backend DeveloperLocation: Barcelona, Spain (40% onsite, 60% remote)Duration: PermanentDescriptionDaily ... accurately.Conduct code reviews, providing constructive technical feedback to team members.Demonstrate and explain backend

You will be the main developer responsible for the backend service, with a strong focus on performance ... While backend expertise is essential, you should also have solid experience in modern frontend development ... , but not a main requirement—our infra team handles deployments and operations.ResponsibilitiesLead backend ... decisions and drive architectural improvements.Proactively propose and implement enhancements on both backend ... and frontend.Ensure backend and frontend code are well tested, using Playwright for end-to-end and integration

We are seeking a skilled and motivated Full Stack React Developer to design, develop, and maintain scalable ... stack developmentStrong proficiency in React.js, JavaScript (ES6+), HTML5, and CSS3Experience with backend ... candidate will have strong experience building modern front-end interfaces with React and developing robust backend

architecture.Write unit and end-to-end tests to maintain quality.Collaborate closely with UX designers and backend ... Contract React Developer Location: Hybrid – Must be available in Barcelona office 2 days per week (Thursdays ... is partnering with a leading global client whose eCommerce team, We’re looking for a Contract React Developer

chops.Familiarity with observability tools (Prometheus, Grafana, OpenTelemetry).BenefitsGenerous pay & developer-first ... Engineer - someone who’ll own the backend systems that power our crypto and self‑custody platform. ... deep expertise in Go, and TypeScript.What you’ll doDesign, implement, and operate scalable, resilient backend ... developers focus on building great products instead of managing complex crypto tooling.We're hiring a Backend ... database schema design to distributed cache strategies and sharding approaches.Your profile3+ years of backend

We are looking for a Full Stack Developer with a heavy backend emphasis to join our Growth Team.

Your ProfileWe are looking for a Senior Full Stack Developer (React / Next.js + Python) to join a strategic ... and international environment.4–5+ years of experience with React and Next.jsExperience developing backend

Backend: Solid experience with Python, Django, and PostgreSQL. ... Backend Development: Build scalable and secure APIs using Python and Django.

Senior React Developer We are:Wizeline, a global AI-native technology solutions provider, develops cutting-edge ... You will collaborate closely with product, design, and backend teams to deliver high-quality, accessible ... streamline workflows.Experience with performance optimization and front-end testing frameworks.Exposure to backend

.NET, PostgreSQL, and ReactComfortable working with AWS, Docker, and GitHubActively uses AI-powered developer ... company.Bachelor's degree in Computer Science or equivalent practical experience6+ years of professional backend

This role has a strong focus on backend development and API architecture, while working very closely ... Both the frontend and backend technology stacks are not yet fully defined, making this a key position ... The engineer will be involved in designing, developing, and evolving scalable backend systems, creating ... Strong experience with TypeScript is expected, along with exposure to additional backend languages and ... While the position is backend-focused, experience collaborating with frontend teams and an appreciation

collaborative work environment, where you will have the opportunity to learn and grow as a software developer ... team.Design, build, and review scalable frontend solutions using React and modern frontend practices.Drive backend

that your unique skills, passion and superdrive will help us achieve our vision.As a Senior Frontend Developer ... Next.js, and modern JavaScript/TypeScriptCollaborating closely with product managers, designers, and backend

JavaScript, React/Angular).Performance optimization techniques (lazy loading, caching, CDN, minification).Backend ... testing tools (e.g., JMeter, Gatling, LoadRunner, k6).Experience with frontend monitoring frameworks and developer ... SLAs.Analyze frontend performance using modern tools (e.g., Lighthouse, WebPageTest, Dynatrace) and browser developer

Glovo seeks Senior Backend Engineers to lead technical projects, mentor team members, and develop software using modern engineering approaches. Requires experience diagnosing performance problems, mentoring, and leading projects. Strong Java or other high-level language skills and knowledge of object-oriented programming and software architecture are essential.

Senior Backend ML Engineer will design, develop, and productionize scalable systems using Python and Flask. Translate customer requirements into practical solutions and collaborate with stakeholders to deliver AI-driven products.

from Barcelona (an indefinite Spanish employment contract)We're seeking an experienced Agentic AI Developer ... conceptsDocument technical architectures, patterns, and best practicesTechnical ImplementationBuild robust backend

data consistencyDebugging across frontend, backend, and environment layers using logs, network analysis ... architecturesValidating REST APIs (request/response contracts, authentication flows, error handling, backend ... early defect detection and regression coverageValidating complex user journeys and ensuring frontend/backend

Would you be interested in continuing to grow as a Senior Angular Developer in a leading multinational ... At Oxigent Technologies, we are selecting a Senior Angular Developer to participate in an Agile transformation