Empleos de senior java backend engineer en Madrid

Merlin Digital Partner is seeking a Senior Software Engineer (Python) to design backend systems, cloud infrastructure and APIs powering its connected health technologies. You will work closely with Product, AI, Embedded and Frontend teams to deliver scalable, reliable software across the stack. You will own architectural decisions, build robust APIs,...

Jobtailor is seeking a Senior Backend Stack Engineer to own the Translation Management System Platform and related services. You will steer architecture, reliability, and evolution across translation workflows, vendor and customer management, and multiple internal integrations. You will set scalable boundaries, document ADRs, design secure REST APIs, and...

Miratech, a global IT services and consulting company, is seeking a Senior Backend Engineer (Golang) to design and build scalable backend systems. You will develop distributed services, robust APIs, and event-driven architectures while ensuring performance and reliability. Occasional frontend work with React may be required. The role emphasizes API design,...

Kraken is seeking a Senior Software Engineer to lead the Consumer team, owning the architecture of Rust backend services powering trading, payments, and crypto experiences. You will drive end-to-end ownership, mentor engineers, and collaborate with product leadership to shape roadmaps. A strong emphasis on AI-assisted development and high-quality user...

Ciklum in Málaga, Spain, is seeking a Senior Python Engineer to join a cross-functional team building backend features. You will implement AI on the client's internal platform, support high-quality code, and collaborate across planning, development, testing, and deployment. The role emphasizes PostgreSQL design, Alembic migrations, and REST API work, with a...

IFS in Madrid, MD, ES is seeking a Senior Software Engineer, AI Agents to build the AI-driven backend powering enterprise workflows on site in Madrid. You will develop the session and memory model, retrieval, and agentic flows for multi-step work. You will implement multi-tenant SaaS capabilities, ensure secure integration with API gateways, and optimize for...

Scrambly S.r.l. is seeking a Senior Backend Engineer to help build the core systems behind Scrambly. You’ll work on user-facing product systems and the internal platform, solving scalability challenges for a global, adtech product. You’ll design and maintain scalable Node.js/NestJS RESTful APIs, mentor engineers, and collaborate with Product, Design and...

Playson is seeking a Senior Backend Developer to build, optimise and scale high-load backend services where latency matters. You will own core features and write production-grade code daily in a distributed environment. Join a cross-functional team using Node.js/TypeScript, Kafka and cloud-native infrastructure on Kubernetes with AWS/GCP. Expect on-call...

commercetools is seeking a Senior Search Engineer to join the Discovery Team to build the retrieval layer behind product discovery for leading ecommerce brands. You will enhance search across catalogs, enabling fast, cost-effective results in a scalable JVM backend. You will work on lexical, semantic, and hybrid retrieval with ElasticSearch/MongoDB,...

Semrush Development, S.L.U. is seeking a Senior Backend Developer to deliver enterprise BI dashboards. You will work across Python, Go, and SQL to ingest and present large-scale data with reliability and performance. You’ll build data pipelines, crawlers, and analytical workflows while deploying scalable services on Kubernetes. The role emphasizes...

UserWise, LLC is seeking a Principal Server Engineer to own our backend for live games with 1M+ DAU. You will design scalable Go/Python services, extend Nakama core game services, and drive performance improvements across PostgreSQL and in-memory stores. You will lead investigations, optimize distributed systems, and ensure reliability in production. The...

Playtomic is seeking a Senior Backend Engineer for the Payments team in Madrid. You will develop and maintain APIs and services to enable smooth frontend-backend communication and integrate third-party payment gateways to ensure secure transactions. You will work with cross-functional teams to design innovative solutions, optimize payment processing, and...

TEAM International Services is seeking an experienced Senior Backend / Platform Engineer to design and develop scalable backend APIs and secure microservices for enterprise AI platforms. You will work on real-time AI model hosting, RBAC, and integration with databases, APIs, and cloud infrastructure. Required: strong backend experience with Python and...

Astek Iberia está buscando un/una Ingeniero/a de Software en C++ para colaborar con nuestro partner líder en el sector B2C IT travel a nivel global. Desarrollarás funcionalidades en soluciones de pago, en un entorno Cloud y con microservicios. Ofrecemos crecimiento profesional rodeado de especialistas IT, horario flexible, modalidad híbrida 50% remoto y...

Clarivate is seeking a Senior Software Engineer for AI Product Development to join the Cortellis CMC team in Barcelona. This permanent full-time role involves the design and implementation of backend services, with a focus on AI capabilities and scalability. Candidates should have a Bachelor’s degree in a related field and over 5 years of experience in...

Urban Sports Club in Valencia is seeking a Senior Backend Engineer to enhance our technology offerings. In this role, you'll architect and develop impactful Golang and PHP services, collaborating with cross-functional teams to foster an outstanding wellbeing experience. Ideal candidates will have over 5 years of backend engineering experience, demonstrating...

Actual Talentis a talent acquisition consultancy that offers Specialized Search, RPO and Talent Solutions.Our purpose is to drive the growth and fulfillment of individuals and organizations. We facilitate individuals in finding inspiring opportunities and help organizations discover professionals who will take them to the next level. We do this through...

MotorK is seeking skilled engineers to join MotorK Ultra, an elite unit building scalable backend systems across Europe. The role emphasizes clean architecture, AI-driven problem solving, and high autonomy in a fast-moving, low-bureaucracy environment. You will work with PHP/Node.js/Java, modern frontend stacks (Vue/React/Angular), and AWS, contributing to a...

CrowdFarming está buscando un Senior AI & Backend Engineer para trabajar en una plataforma tecnológica distribuida en producción, con foco en IA, agentes y automatización. Se requieren sólidos conocimientos en Node.js/TypeScript, NestJS y AWS, y experiencia en sistemas observables y pruebas modernas.El rol implica diseñar e implementar soluciones...

A leading technology firm is looking for a Python Developer in Madrid. This role requires over 5 years of experience in backend systems at scale, utilizing technologies like AWS and Kubernetes. The ideal candidate must have strong communication skills to collaborate effectively with an international team. Benefits include flexible working options,...