Empleos de backend full stack engineer en Madrid

Are you ready to revolutionize the world of clinical trials? At Evinova, we're on a mission to transform drug development by leveraging cutting‑edge AI and Machine Learning. With the goal of increasing clinical trial success rates by 20%, accelerating timelines by 36 months, and slashing study costs by 50%, we need innovative minds like yours! If you're a...

Ersilia, based in Barcelona, is seeking a Senior Full Stack Engineer to design, build, and own product features across frontend and backend systems. You will collaborate with tech leadership and cross-functional teams to deliver high-quality software used by customers daily. The role emphasizes delivery, quality, and collaboration, with an opportunity to...

Full Stack Engineer - React / Typescript / Python We are currently partnered with a world-leading quantum AI company developing cutting‑edge solutions that make artificial intelligence faster, greener, and more accessible. Their products bridge the gap between quantum computing and AI, helping global clients solve complex real‑world problems at scale....

About Lasting Dynamics Lasting Dynamics is an independent software company founded in 2015, built without external investments. We grow through long-term partnerships rather than high-volume delivery. Many of our partners come to us after unsuccessful outsourcing experiences and stay with us for years. We deliver complex web and mobile solutions with a...

Can you be a haddock Product Engineer? Engineers at haddock are best-in-class:intelligent, action-oriented ,curious ,communicative ,autonomous , andcommitted.We strongly adhere to theLean Startupand Agile principles. That's why we work oninitiativesinsmall mission-oriented squads of 1 to 3 people .We rely heavily on AI for everything . We all embrace using...

Affirm, Inc. is hiring a Software Engineer II, Fullstack (Repayment UX) to join our remote-first team based in Spain. You will help design and ship backend systems and web apps using React or Vue, with optional React Native experience. The role supports a European-wide time zone and requires on-call rotation. The Repayment UX team works across product,...

About us At Visium, we help leading enterprises define their AI strategy, deliver large-scale data transformations, and embed AI across operations to make organizations truly future-proof. Now we are building something entirely new. A state-of-the‑art Agentic AI Platform designed for the Life Sciences industry, where knowledge, regulation, and innovation...

A fast-scaling AI startup is seeking a Fullstack Engineer to build their generative AI applications. In this remote role, you will design, build, and deploy production-ready features, work with modern frameworks like Ruby on Rails and React, and collaborate directly with a high-impact team. Ideal candidates have solid experience in full-stack development and...

Treatwell is seeking a Senior Full Stack Engineer (React & Java) to build and operate Connect, a SaaS platform for beauty and wellness across Europe. You will own features from database to UI, pair with cross-functional teams, and focus on testing, observability, and scalable architectures. The role emphasizes a DevOps mindset, data-driven decisions, and...

APPTIVA CORE TECHNOLOGIES is seeking a Fullstack Developer to join our team in Madrid, Spain. This role involves working in a cross-functional team responsible for the entire software development life cycle, from conception to deployment. You will design and build scalable software solutions while ensuring high standards of security and data protection. The...

Mainloop seeks Full-Stack Engineers to join an AI-native team in Barcelona. You will own products from development through long-term success, building frontend and backend software used across international teams. Candidates across North America relocation to Barcelona are welcome, with visa sponsorship and relocation support available. You will work with AI...

En Minsait, creemos en el talento que impulsa el cambio. Únete a nuestro equipo de desarrollo de software en sector Retail como Full Stack Developer (Java / React) con mayor foco Backend y sé parte de esta transformación, y trabajar en una modalidad de trabajo FULL REMOTE desde cualquier punto de España, o en un formato híbrido en A Coruña. Lo que...

Alpaca is hiring Senior Full-stack Engineers to design, build, and operate scalable distributed systems powering global investing. You’ll own projects end-to-end—from concept and coding to production deployment and maintenance—in a fast-moving, highly autonomous environment. Join teams like Trading Platform, Internal Tools, and Operations Automations;...

remoteo busca profesionales con experiencia en desarrollo web full stack usando React y .NET, capaces de migrar aplicaciones WinForms a una arquitectura web moderna. Se valoran APIs REST y SQL Server, Git y CI/CD en entornos ágiles.La empresa ofrece plan de carrera, formación continua, proyectos nacionales e internacionales con movilidad, tarjeta...

Jornada:Completa (horario flexible a definir)Dependencia jerárquica:Reporta al CTOSobre la Fundación Maldita.EsLaFundación Maldita.Eses unafundación sin ánimo de lucrocon sede en España que protege la i ntegridad de la informacióny promueve la construcción deconfianza ciudadanaa través de periodismo, educación,tecnología, i nvestigación e...

Andrews Recruitment Group is recruiting Senior Software Engineers to support large-scale AI training projects. The role is fully remote and flexible, with roughly 15 hours per week billed on an hourly basis. Candidates should have solid software engineering experience, strong knowledge of algorithms and data structures, and comfort tackling complex problems...

We are looking for a Senior Full Stack Engineer to join one of our Product Tribes, the cross-functional units that own the end-to-end experience for a specific Toggl user role. You'll join the Tribe building for managers, the people who plan work, protect margins, and keep projects on time and on budget. You'll do this as we build and launch Toggl 2.0, our...

What sets us apart drives us ahead: between local roots and global relevance, we are a unique blend of tradition and future, of foundation and growth. Come and shape the future of finance with us. Madrid | Working from home up to 40% | Reference 8191 Are you passionate about modern technology? Do you want to work in an agile, self-organized...

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior+ Full-Stack Engineer based in Spain. As a Senior+ Full-Stack Engineer, you will build and evolve a developer infrastructure platform that enables AI applications and agents to connect seamlessly with external APIs and...

About the RoleWorking with a Series B Tech startup within energy industry. We are looking for a Staff Full Stack Engineer to lead technical vision, architectural design, and execution across systems driving their expansion. You will build high-impact backend infrastructure, automate tendering workflows, design deal-gating risk tooling, and deploy agentic...