Empleos de senior backend java engineer remote en Madrid

Tappx, a fast-growing AdTech firm, seeks a PHP Backend Developer to design, implement, and maintain SSP projects with high scalability. You will lead full product life cycle from conception to production and monitoring, driving technical excellence and reducing debt. You will implement internal tools in PHP, ensure code quality with automated tests and...

Chainlink Labs is seeking a Software Engineer for the CCIP Protocol to design and maintain services that coordinate fast, fault-tolerant cross-chain transactions under adversarial conditions. You will join a team focused on reliability, security, and scalability across a remote-friendly environment. In this role, you will work with Go, Rust, or TypeScript to...

Mimica is hiring Senior+ engineers to lead backend development for ML-driven tasks. You will own core Python services interfacing with ML models and contribute to our platform architecture and DevEx. This fully remote role offers collaboration with Data Scientists and scalable systems. You will join a Python-focused chapter, shaping technical direction,...

We are bsport. The place to be! bsport is an all-in-one platform combining boutique fitness and advanced technology. Our platform helps our partners manage their bookings, payroll, marketing and more, to streamline operations and boost their commercial success. We are bsport. The place to be! bsport is an all-in-one platform combining boutique fitness and...

Affirm is seeking a Staff Software Engineer, Backend for Identity International to set the technical strategy for the team on a yearly horizon, aligning with product management, design and analytics to deliver scalable identity services across markets outside North America. You will own operations, reliability, and code standards, mentor engineers,...

Marfeel is looking for a Backend Engineer to join their team in Barcelona. You will design and maintain backend services, utilizing Node.js and various databases while ensuring high performance and scalability of applications. The ideal candidate will have over 5 years of experience with a solid understanding of API design and cloud deployments. Benefits...

Prima is seeking an experienced Elixir Engineer to join our dynamic teams in Madrid, shaping scalable services for a modern motor insurance platform. You’ll architect, design, and maintain backend systems, collaborating with product managers and engineers to translate business needs into reliable software.We value curiosity, proactive problem-solving, and...

Paradigma Digital S.L. busca un desarrollador backend con Python y Django para construir APIs rápidas, observables y escalables, optimizando rendimiento desde la base de datos hasta la entrega continua. El equipo técnico es de alto nivel y se valora la autonomía y la proactividad. Ofrecemos libertad con responsabilidad en un modelo remoto o híbrido,...

Lever, Inc. seeks a Backend Engineer focusing on MTA infrastructure, based in Spain but fully remote. You will build and operate high-volume email delivery systems, including SMTP delivery, routing, retries, and reputation controls, with ownership across reliability and observability. You'll work with Trust & Safety and Core Sending teams, using TypeScript...

Santander Auto Software está buscando un ingeniero de software back-end para construir y desplegar soluciones cloud-based en AWS. Se valorará experiencia en Java o Kotlin, Spring Boot y una mentalidad DevOps, con capacidad para trabajar de forma autónoma. La posición es remota y admite colaboración internacional; se requieren habilidades de...

Affirm is seeking a Staff Software Engineer, Backend (Identity International) to lead backend architecture for global markets from Spain. You will design scalable systems, shape technical strategy, and collaborate with product, design and analytics to ensure robust identity services. You will own operations, drive high availability, and help grow talent...

Anyone AI Inc. is seeking a remote, part-time, project-based expert evaluator to design and assess realistic software engineering tasks, spanning bug fixing, feature development, refactoring, and test generation. Contributors will work remotely, control their own schedule, provide their own tools, and may serve multiple vendors, with per-project compensation...

BLP is hiring ambitious engineers to design and build Delta, the core software that powers our platform. You will work on cloud infrastructure, backend systems, and applying the latest AI techniques to automate complex business processes. Our team values precision, formal reasoning, and rigorous testing to ensure correctness as we scale. We welcome...

A leading technology recruitment firm is looking for a Python Developer in Barcelona to build scalable backend systems utilizing Python and Flask. The ideal candidate has over 3 years of experience in Python programming and hands-on experience with Flask. They offer a flexible, remote-friendly work culture, career growth opportunities, and work on projects...

Prima is seeking a Rust Engineer to join our dynamic teams in Spain. You’ll architect and deliver scalable services, collaborating with product managers to translate business requirements into robust software solutions. Join over 350 engineers delivering impactful insurance software. We offer flexible work options—work from home, the office, or a...

About The CompanyScrambly is one of the fastest-growing adtech startups in the world, featured in the AppsFlyer Performance Index and Singular ROI Index in just 3.5 years. We're growing 250%+ YoY across revenue, team, product, and technology - fully bootstrapped and profitable. We're building the future of app discovery: a reward-powered alternative to the...

Descripción del puesto En The Whiteam Consulting estamos buscando un/a Senior Backend Developer con sólida experiencia en Java, Spring Boot y Spring Batch, para participar en una iniciativa estratégica de transformación tecnológica orientada a la modernización de sistemas Mainframe. La persona seleccionada trabajará en la migración y evolución de...

Hyqoo is seeking a Software Engineer / Python Developer for a contract, remote role. You will design, develop, test, and deploy scalable Python applications and backend solutions, with emphasis on clean code and maintainability. You will work across product and engineering teams to transform business requirements into robust technical solutions, contribute...

Partner Company in Spain is seeking a Backend QA Engineer to own software quality across a high-traffic backend platform. You will combine manual testing with automated test development using TypeScript and Playwright to validate complex transactions, API integrations, and event-driven workflows. Work remotely within Europe with cross-functional...

Grafana Labs is seeking a Staff-level Backend Engineer to design and ship core backend services powering a context layer for AI-driven data intelligence. You’ll build the foundation for a scalable, multi-tenant SaaS, with ingestion, storage, APIs, and agent-facing integrations in a production-grade environment. This remote-first role offers Spain as a base...