1118 backend developer English-speaking jobs in Catalonia

* Which frontend and backend frameworks have you used in recent projects (React, Next.js, Streamlit, ... modern web applications supporting scientific and AI workflows, including frontend user interfaces, backend ... support scientific interpretation. • Build and maintain secure and scalable RESTful and/or GraphQL backend

and adapt to new technologies and programming paradigms Understanding of security best practices in backend ... standards for C# development, testing, and deployment Implement observability, logging, and monitoring for backend ... designers, product managers, and engineers across disciplines to understand requirements and deliver robust backend

From high-performing APIs to backend algorithms, integration frameworks, to guaranteeing data privacy ... You’ve worked with a variety of web APIs and developed backend services using modern OOP practices. ... a high-velocity engineer who thrives in dynamic environments—someone who can iterate quickly, build backend ... However, this role is more heavily focused on backend development, but will have some frontend development ... Proficient in English Tech stack Our systems are built in Ruby on Rails, PostgreSQL and Redis on the backend

The DevOps & Tools team delivers the CI/DE platforms, developer tools, and internal infrastructure that ... Hands‑on experience maintaining pipelines, developer tools, or Linux‑based systems. ... build environments, we require engineers who can contribute to system reliability, automation, and developer ... & Tools Engineer plays a central role in implementing improvements to CI/CD pipelines, maintaining developer

Implement API-centric architectures that ensure clean separation between frontend and backend services ... What We're Looking For - Core Experience & Skills Experience with Python-based backend frameworks ... who take pride in building secure, scalable systems that bridge frontend user experiences with robust backend ... Champion observability practices by integrating logging, metrics, and monitoring into both frontend and backend

/ AI engineer in an early‑stage startup Strong backend and system design experience Hands‑on experience ... Experience with AI/ML‑powered features and LLM‑based systems Experience working with Python and modern backend ... recommendation systems Develop Graph RAG and intelligent introduction recommendations Build and ship core backend ... engineering, AI, or ML Proven experience as: AI Engineer Lead, Tech Lead, Founding Engineer, or Senior backend

Implement API-centric architectures that ensure clean separation between frontend and backend services ... What We’re Looking For - Core Experience & Skills Experience with Python-based backend frameworks like ... who take pride in building secure, scalable systems that bridge frontend user experiences with robust backend ... Champion observability practices by integrating logging, metrics, and monitoring into both frontend and backend

Growing @eDreams ODIGEO Tech Hubs iOS Developer - (Hybrid) As you contemplate your future, you might ... We are seeking an experienced iOS Developer to join our Prime Area in Barcelona (hybrid) to scale our ... What you will do As an iOS Developer in the Prime Area you will be in charge of: Build a single core

breathes the LLM ecosystem and knows how to turn state-of-the-art models into reliable, production-ready backend ... You write clean, scalable backend code.Location & Setup:Hybrid: 3 days in the office, 2 days from home.Office ... Requirements:Proven Experience: You have hands-on experience building and deploying AI agents and LLM-powered backend

Collaborate with backend engineers to integrate AI capabilities. ... Backend: FastAPI, SQLAlchemy, Pydantic. Cloud: GCP (Vertex AI, Cloud Run), Terraform. ... You will also implement MLOps pipelines, optimize performance, and collaborate closely with backend engineers

working in Agile environments using Git and Jira You will be responsible for designing and developing backend

Our backend is powered by Node.js (Koa, NestJS) and MongoDB. ... You have at least 5 years of experience as a Fullstack Developer.

data generation, seeding, environment control) Exposure to AI-assisted testing / LLM-based tooling Backend ... English (written and spoken) You Can Impress With These Additions Experience building internal developer

millions of events daily Build batch and real-time data pipelines Write production-grade Python and backend ... and availability ✅ Develop monitoring and alerting solutions for reliability Collaborate closely with backend

Backend Proficiency: Hands‑on experience in modern backend languages (Python strongly preferred; Go or ... a Full Stack Engineer with a strong focus on modern web development to help build and maintain the backend ... Development: Build and maintain full stack web applications and internal tools, from front-end UI/UX to backend

We are looking for: Senior AI Platform Backend Engineer (LLM) Key Responsibilities Design, implement ... Develop backend architecture for AI Verification and Az ChatGPT Services using Python and FastAPI.

Qualifications At least 5 years of experience as a frontend developer; Experience in developing applications

Backend Proficiency: Hands‑on experience in modern backend languages (Python strongly preferred; Go or ... a Full Stack Engineer with a strong focus on modern web development to help build and maintain the backend ... Development: Build and maintain full stack web applications and internal tools, from front‑end UI/UX to backend

Have strong backend fundamentals and experience building APIs and backend services. ... across the full stack of our SaaS platform, using React and Next.js on the frontend and Express on the backend

Technology Stack Oversight: Guide the team in designing and building scalable backend services using ... Cloud & Backend Proficiency: Strong practical experience designing and building scalable applications ... of experience managing an engineering team that has successfully delivered user‑facing features and backend