Top Software Engineer Jobs in Madrid

Build end-to-end full-stack AI features on a Ruby on Rails backend and React frontend, design and run experiments (A/B tests and AI evaluations), implement AI infrastructure for reliable LLM inference, and iterate quickly to scale production-ready LLM-powered products.

The Software Engineer will join a product squad to develop and maintain functionalities on the 360Learning platform, focusing on JavaScript technologies and clean architecture.

Design, build, and deploy enterprise-grade agentic AI workflows. Integrate LLM APIs and multi-provider abstractions, implement cloud-native deployments (containers, CI/CD), measure agent performance, and partner with clients to drive production-ready AI systems across domains.

Lead design, build, and run production-grade agentic AI systems for enterprise clients. Develop multi-LLM integrations, RAG pipelines, orchestration, LLMOps, and cloud-native deployments. Engage clients through workshops, POCs, and engineering leadership, define metrics and evaluation, and produce reusable patterns and observability for scalable, secure agentic workflows.

Design, build, and deploy production-grade agentic AI systems for enterprise clients: agent orchestration, RAG pipelines, multi-LLM integration, LLMOps, cloud-native deployment (Kubernetes/Docker), observability, and client-facing workshops to operationalize AI workflows.

As a Senior Software Engineer, you will enhance the REDAPL platform, leading initiatives in data ingestion, processing, and supporting infrastructure-related projects while mentoring other engineers.

As a Staff Software Engineer, you'll shape technical strategy, build integrations and services, lead operational processes, and mentor your team, ensuring high-quality code and fostering collaboration across teams.

As a Staff Full Stack Software Engineer, you'll guide technical strategy, mentor engineers, and ensure quality in full stack development while collaborating across teams.

The Software Engineer will develop and maintain web applications visualizing sustainability data, contributing to global conservation efforts. Ideal for entry-level candidates with a recent degree.

The Fullstack Software Engineer will design and build the core billing platform, handling payments and transactions while ensuring system scalability and reliability.

As a Fullstack Software Engineer, you will develop the core billing engine, ensuring accurate transaction processing, integrating with systems and platforms, and collaborating with teams to maintain a unified platform experience.

As a Fullstack Software Engineer, you'll engineer systems for payroll and benefits, automate workflows, and collaborate with HR teams to improve user experience. You will work with modern technologies to simplify complex business processes.

The Senior Cloud Software Engineer will lead the design and implementation of scalable cloud infrastructure, ensure service reliability, and mentor junior engineers while collaborating on cross-functional projects.

The Senior AI & Computer Vision Software Engineer will work on innovative software solutions, bridge research and production, and mentor others while working in an Agile environment.

Contribute to design, development, and maintenance of scalable Node.js/React web applications. Build secure, scalable REST APIs, work with MongoDB, and maintain strong unit/integration/e2e testing practices while collaborating with engineers, product, and QA.

Develop high‑traffic web applications and self‑serve conversion flows (discovery → quote → signup), build and optimize alan.com and marketing acquisition systems, collaborate with Marketing/Sales/Product/Data/Design, and deliver measurable improvements that drive member acquisition and revenue using the company stack.

Build ML prototypes and data pipelines, collaborate with researchers and product engineering to integrate models into Fusion, containerize and deploy applications, implement best practices, and document architectures to accelerate research-to-production workflows.

Develop and optimize Soroban smart contracts and integrate anchor services on the Stellar network for cross-border payment solutions. Collaborate with cross-functional teams, test and debug smart contracts, document development processes, provide technical support, and stay current with blockchain and payments technology trends to ensure secure and efficient implementations.

Build and maintain high-security mobile wallet apps using React Native, Swift, or Kotlin. Implement biometric authentication and secure key storage, collaborate with cross-functional teams, debug performance issues, and propose UX and security improvements.

Implement and optimize EVM-compatible features, reduce gas usage, develop and test smart contracts, collaborate on Ethereum infrastructure, and provide technical support.

Develop and deliver AI-powered digital products as a senior full-stack engineer using TypeScript and React. Adapt across full-stack environments, leverage AI tooling and LLMs, understand agent architectures, collaborate across cross-functional teams, communicate clearly in English, and perform in fast-paced, dynamic settings.

Design, build, and operate scalable test platform capabilities (synthetic identities, test data seeding, mocking, deterministic validation, load testing). Improve reliability, observability, and automation of CI/test workflows, lead medium-to-large projects, own operational readiness, mentor engineers, and produce async technical artifacts to enable faster, safer developer validation loops.

Dragonfly is seeking Software Engineers for various portfolio companies, focusing on crypto technologies. Engineers of all experience levels are needed across multiple stacks.

Seeking software engineers with at least 2 years of production backend experience, interested in crypto and blockchain technologies, for roles with portfolio companies.

Develop and maintain backend services and platforms for Wi‑Fi network design and optimization. Contribute to architecture, implement scalable microservices on AWS, work with device data and APIs, debug production issues, collaborate with cross-functional teams, and mentor junior engineers.