Senior Backend Engineer jobs in Spain

🚀 Sobre nosotros: Somos una compañía de marketing tecnológico en fase scale-up (145 personas y creciendo), con una firme apuesta por la IA Generativa para transformar cómo las empresas entienden y ejecutan sus estrategias de marketing digital. Nuestro objetivo es crecer de manera sólida, eficiente y global, impulsando la innovación y el impacto real en nuestros clientes. 🧭 Tu misión Diseñar,...

Responsabilidades - Diseñar e implementar microservicios y APIs REST/GraphQL en TypeScript (Node.js) y Python. - Construir soluciones event-driven integrando colas/streams (SQS/SNS, Kinesis/EventBridge o Kafka) y BPM/Step Functions. - Diseñar y operar componentes en AWS (Lambda, API Gateway, S3, RDS/DynamoDB, IAM), asegurando seguridad, coste y resiliencia. - Definir Infraestructura como...

ABOUT US Signaturit Group is the Europeen champion of complete and secure digital transactions. Thanks to a modular platform, we automate transactional processes, from identity verification and KYC to electronic signature and legal archiving. More than 100 thousand customers rely on our solutions to accelerate their business activities, while optimizing their operations. As a certified Trusted...

DESCRIPTION Our client is a company specializing in managing large-scale sporting events, offering services like ticketing, accommodation, hospitality, transportation, and IT solutions. The company values precision and adaptability, as it handles complex operations across global sports events. This is a full-time hybrid role for a Backend Developer based in Barcelona. You will work on...

We are Merlin Digital Partner! A leading IT and digital headhunting company who stands out from the crowd, boasting over a decade of experience. We've successfully collaborated and played a pivotal role in the growth of industry heavyweights such as Wallapop, Glovo, Banc Sabadell, and Factorial, among others. Our emphasis lies in people-centric approaches and optimizing the selection processes....

Workload: 80–100% Join Axpo’s digital journey and help build data-driven products that shape the future of energy. We value quality, collaboration, and continuous learning—and we’re excited to welcome your perspective. What you will do: - Design and develop API-based web applications and services, integrating data and maintain back-end systems for optimal functionality and user experience. -...

Own the Engineering. Make the Scheduling Magic happen. At Doodle, we're building the future of scheduling and productivity, tackling complex challenges at the intersection of human collaboration and digital efficiency. We believe in crafting elegant solutions to intricate problems, and we're looking for passionate Software Engineers who share this drive . You're more than a coder; you're a...

We are looking to fill this role immediately and are reviewing applications daily. Expect a fast, transparent process with quick feedback. Why join us? We are a European deep-tech leader in quantum and AI, backed by major global strategic investors and strong EU support. Our groundbreaking technology is already transforming how AI is deployed worldwide — compressing large language models by up...

💜 About Loyal Guru La plataforma de Loyal Guru resuelve los desafíos únicos del negocio retail a través de iniciativas de loyalty de próxima generación, ofertas personalizadas a escala, analítica avanzada de retail y nuevas oportunidades de monetización. Nuestra solución simplifica las complejidades que surgen del alto volumen de shoppers, transacciones y datos del Enterprise Retail....

We are Merlin Digital Partner! A leading IT and Digital headhunting company who stands out from the crowd, boasting over a decade of experience. We've successfully collaborated and played a pivotal role in the growth of industry heavyweights such as Wallapop, Glovo, Banc Sabadell, among others. Our partner, a rapidly growing startup, has created a debt recovery platform powered by IA, designed...

We are looking for a Senior Software Engineer to join our early team and help build the core platform of a startup transforming Audit 4.0 and control management for companies. Who are we? At Byld, we don’t just build businesses—we create game-changing ventures in collaboration with leading corporations. Since 2017, we’ve been designing, validating, and launching new companies, blending the best...

Workload: 80–100% Join our dynamic team in Madrid and help shape the future of digital energy solutions. As part of Axpo's innovative IT center, you'll build cutting-edge web applications that drive the energy transformation forward. What you will do: - Architect, develop, and maintain high-quality, scalable frontends using React 18+ and TypeScript 5+ - Lead the development of new features...

Blackwall is an AI-enabled security and web infrastructure company dedicated to safeguarding web ecosystems from automated threats. Deployed across 2.3M+ websites and applications, GateKeeper, the company’s flagship product, is trusted by 100+ service & hosting partners globally to enhance performance, reduce operational costs, and maximize revenue by protecting SMB customers worldwide against...

Workload: 80–100% Help us shape intuitive mobile experiences for a leading Swiss energy brand. Join a cross-functional team in Madrid, build with a modern stack, and make an impact for millions of users. What you will do: - Architect, develop, and maintain scalable mobile apps with React Native (0.79+), TypeScript (5+), and Expo - Lead features end-to-end from concept to deployment with strong...

About the role As a Senior Software Engineer at TF Avarda Bank, you will play a key role in designing, developing, and evolving our public-facing websites. These platforms are business-critical and highly visible, sitting at the intersection of engineering, performance, marketing technology, and user experience. You will work closely with other engineers, designers, and marketing stakeholders,...

Manusa somos una empresa referente en el mercado de los accesos inteligentes gracias al desarrollo de una tecnología propia y a un equipo de más de 500 profesionales, repartidos en 10 centros de trabajo en España y las filiales de Portugal, Italia, Brasil y China, con un objetivo común: la innovación. Nosotros mismos creamos, diseñamos, desarrollamos, fabricamos, instalamos, mantenemos y...

Are you ready to take ownership of Axpo’s Virtual Desktop Infrastructure (VDI) platform? Join us as a Senior System Engineer VDI and play a pivotal role in ensuring high-performance, reliable, and secure operations. Shape the future of ICT at Axpo EMEA SL with your expertise and innovative mindset. What you will do: - Guarantee reliable and high-performance operations of the VDI Server...

ARQUIMEA, we are a technology company operating globally and providing innovate solutions and products in highly demanding sectors. Our areas of activity are Aerospace, Defense & Security, Big Science, Biotechnology and Fintech. ARQUIMEA Research Center (ARC), part of ARQUIMEA , was born in 2019 with the aim of inventing the technologies of tomorrow. An environment of innovation and excellence...

WHO ARE WE? Sateliot is a Barcelona-based Startup in the New Space sector, becoming the first satellite telecommunications operator that will provide global and continuous connectivity to all the elements that will make up the massive Internet of Things (IoT) universe under the 5G protocol. In order to do so, Sateliot is launching a constellation of last generation nanosatellites, located at...

Workload: 100% Join Axpo and help shape the future of energy through innovative Salesforce solutions. As a Senior Salesforce Engineer, you'll lead technical delivery, define product strategies, and drive digital transformation in the energy sector. What you will do: - Lead and execute Salesforce implementation projects end-to-end, ensuring timely delivery, operational stability, and...