Empleos de full stack engineer annotator en Barcelona

Hired is seeking an experienced engineer to design, develop, and maintain high-quality code for training and optimizing AI models. You will evaluate model performance and rank responses across domains, while producing clear explanations and rationales for evaluations. The role also leads supervised fine-tuning with the creation and maintenance of...

Cakewalk is seeking a Senior Full-Stack Engineer to build and improve customer-facing features across the frontend and backend. You will own features from early discussions through implementation, testing, release, and ongoing maintenance. You will collaborate with Product and Customer Success to translate customer needs into reliable, maintainable...

Alan is seeking a Software Engineer to join our team in Spain. You will build and evolve our employee affiliation engine, simplify payroll and billing tools for HR teams, and create seamless integrations with Payfit and Workday. You’ll automate workflows at scale and collaborate across product, design, and operations to deliver a unified experience. We...

Senior Full Stack Engineer (Remote in Spain Possible) Apply for the Senior Full Stack Engineer role at LanguageWire, a global leader in language and content services dedicated to helping brands reach their full global potential. About the Role You will help modernize our core application and develop valuable features for our translators, customers and...

bunch is building the operating infrastructure for private markets. As a Full Stack Engineer with a frontend focus in our Platform team, you’ll shape frontend architecture, contribute to backend services, and help maintain our Design System. You will ship end-to-end features that empower thousands of users managing billions in assets. You’ll collaborate...

Kodify is hiring a remote Full-Stack Developer to join a high-traffic platform serving millions of users. The role emphasizes React, Next.js, Node.js and GraphQL with a NoSQL stack, and requires collaboration with product owners, designers and domain experts to ship scalable features. You’ll own features from design through deployment, advocate clean code...

N-iX is looking for a Senior Full Stack Engineer in Spain. In this role, you will design and implement APIs in Go and build user-facing features in React. Collaborating with a cross-functional team, you'll ensure high performance experiences for users. Ideal candidates will have 5+ years in software development with strong experience in backend APIs,...

Grupo Digital busca un ingeniero/a senior Full Stack con base sólida en Java/Spring Boot para desarrollar aplicaciones empresariales modernas y acelerar el SDLC con IA. Trabajarás con microservicios, REST APIs y pipelines CI/CD, integrando IA en generación de código, testing y documentación. Serás parte de un equipo que diseña, desarrolla y mantiene...

About Journi is a London-based technology consultancy where we partner with businesses to support their technology needs from strategy through delivery. We provide bespoke software development, digital transformation consulting, team augmentation, and ongoing technical support, helping clients build custom products and scale their capabilities quickly...

AI Deployment Consultant (Onsite – Barcelona)We are working with a fast-scaling AI startup building voice and text AI agents that run inside live production workflows for mid-market and enterprise clients across Europe and LatAm - not demos or pilots, real agents doing real work, live within days rather than months. Backed by €1.9M in pre-seed funding...

Leadtech Group builds and scales digital products used by millions of people worldwide . Within the group, MAU by Leadtech focuses on subscription-based apps and digital products. It builds on the expertise, technology and product mindset developed at Leadtech, combining proven experience with a strong focus on user value and long-term growth. Across both...

From internal tools to company-wide workflows, Noloco turns your data into a custom, AI-powered app your team will love to use. We empower teams running complex operations to create custom portals, such as internal tools, client portals, and CRMs. Changing the way small and medium-sized businesses grow and work together. Backed by Y Combinator, Frontline...

Avenue Code in Spain is seeking senior professionals with a generalist profile, strong backend with Node.js, and solid React frontend experience to own product initiatives end-to-end. You will develop features independently, contribute to architecture, and collaborate in a small, autonomous squad within a SaaS context, balancing speed, quality and...

Leadtech seeks a Senior Full Stack Product Engineer to own end-to-end features for our top web products. You will shape features with the Product team, translate business goals into technical decisions, and uphold high standards for quality and performance. Expect to work across frontend and backend using React, Next.js, Node.js, TypeScript, and JavaScript,...

**¿Te apetece un nuevo reto?** Buscamos personas interesadas en analizar las nuevas funcionalidades **a desarrollar en proyectos con gran impacto sanitario** . En #NTTDATAHealthcare tenemos vocación para liderar la transformación del sector enfrentándonos a los **nuevos retos sanitarios** , apoyándonos en el conocimiento propio e invirtiendo en la...

Schwarz Digits creates the technological foundation for digital sovereignty in Europe. As the IT and digital division of the Schwarz Group, we develop and manage the IT infrastructures for the retail divisions Lidl and Kaufland, as well as Schwarz Production and PreZero. At the same time, we operate as an independent provider in the external market to...

About Telgea Telgea is the largest mobile plan provider measured by launched in the most countries world-wide. We're backed by Telenor, Vodafone, Fastweb, and Swisscom. We give multinational enterprises unified connectivity across multiple countries through one solution. This is enabled by stitching together carriers, regulations, and billing across borders...

Leadtech Group builds and scales digital products used by millions of people worldwide . Within the group, MAU by Leadtech focuses on subscription-based apps and digital products. It builds on the expertise, technology and product mindset developed at Leadtech, combining proven experience with a strong focus on user value and long-term growth. Across both...

Leadtech Group builds and scales digital products used by millions of people worldwide . Within the group, MAU by Leadtech focuses on subscription-based apps and digital products. It builds on the expertise, technology and product mindset developed at Leadtech, combining proven experience with a strong focus on user value and long-term growth. Across both...

bunch is building the backbone of private markets. We are enabling next-gen fund operations with one integrated system that combines secure data infrastructure, AI-powered workflows and expert fund services. If you value ownership, growth through real responsibility, and working with a thoughtful, ambitious team, this role might be for you. Your role...