Top Software Engineer Jobs in Spain

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.

Design, build, and maintain UI platform features using TypeScript and React. Implement RESTful APIs, integrate with microservices, ensure performance, security, and compliance. Write tests, enhance CI/CD pipelines, participate in architecture discussions, mentor juniors, and contribute to cloud-native, scalable solutions.

Work on-site with government customers to design and build data-driven solutions. Responsibilities include full-stack engineering, data integration at scale, architecture design, coding, and collaborating with technical and non-technical stakeholders. Requires adapting quickly, independently owning projects, and deploying solutions that directly impact critical operations.

Design, build, and maintain backend collections systems to manage delinquent loans. Collaborate with product, risk, and engineering teams, deliver features in phases, support operations and on-call rotation, instrument monitoring, and participate in hiring and team growth.

Design, build, and deliver client-facing solutions using the ZAIDYN platform. Support full project lifecycle from requirements, development (Node.js/React.js), testing, and deployment. Integrate APIs, troubleshoot defects, produce documentation, collaborate with cross-functional teams, and apply Agile practices to meet client expectations.

Build and maintain backend collections systems to manage delinquent loans, implement recovery strategies, ensure high availability and reliability, collaborate with product and risk teams, participate in on-call rotation, write well-tested extensible code, and contribute to team growth.

Build and maintain high-volume payment services, write testable code, improve reliability and performance, investigate production issues, collaborate across product and engineering teams, and explore AI-enabled engineering tools to boost productivity.

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 scale backend services for a high-volume distributed tracing pipeline. Work on distributed system challenges, create automation and tooling, participate in architecture, collaborate with product teams, use DevOps practices and on-call rotations, and apply AI tools to accelerate development.

Build scalable backend systems and data pipelines to power consumer credit reporting. Partner with Product, Compliance, Servicing, and Credit teams to design, deliver, monitor, and operate accurate reporting systems, including on-call responsibilities. Develop robust, well-tested code in Python or Kotlin using distributed systems patterns and technologies like AWS, MySQL, and Spark.

Lead backend engineering for Card Acquisition: define technical strategy, deliver quarterly goals, mentor engineers, collaborate with product/design/analytics, build scalable highly available systems, ensure operational excellence (monitoring, on-call, playbooks), and promote quality through standards and tooling.

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.

Design, develop, test and deliver software solutions across the SDLC. Lead system design, create technical artifacts, run PoCs, mentor team members, coordinate offshore development, and ensure quality, security and operational support.

Build and maintain front-end features and developer-facing tooling for New Relic One using modern JavaScript/TypeScript. Select frameworks, produce performant CLI tools, automate developer tasks, collaborate on UI best practices, and implement CI pipelines and testing.

As a Software Engineer, you'll design and develop software solutions, solve technical problems, lead projects, and collaborate with product and operations teams.

Lead design and delivery of AI-powered visualization and investigation features using LLMs. Build reliable, explainable systems combining deterministic product capabilities with generative models, drive prompt/context engineering, evaluation frameworks, and cross-team product-focused technical leadership and mentorship.

Senior engineer owning feature lifecycle: design, architecture, implementation, reliability, and cross-team impact. Lead architecture, SRE/observability, security practices, mentor engineers, and drive product-technical alignment using AI-augmented workflows.

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.

Design, build, and maintain high-performance C++ endpoint agents (Collectors) for Windows and macOS. Own features end-to-end, debug OS-level issues, improve performance, reliability, and security, and create tooling to support development and rollout at global scale.

Develop, debug, document, test and support corporate software using Java and cloud technologies. Collaborate with QA, assist in requirements gathering, manage tasks across the project lifecycle, and participate in on-site implementation when needed.

Develop, optimize, and maintain scientific analysis tools for ground and flight test data; translate mathematical models into efficient software; drive migration to the TSASM time-series platform; provide technical support and act as liaison between Ground Station Team and Spanish Analysis Community; collaborate with specialist test analysis groups across avionics, performance, handling qualities, powerplant and more.

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.