Top Software Engineer Jobs in Spain

As a Backend Software Engineer, you'll design scalable backend systems, optimize database performance, and collaborate with front-end and DevOps teams.

Contribute to Juju's development, collaborate with teams on distributed systems, debug issues, and enhance cloud automation features.

Six-month full-time graduate program for final-year or recent engineering graduates. Work in production from day one, contribute to global-scale systems, learn from experienced engineers, and develop foundations in backend development, testing, CI/CD, cloud, and best practices. Potential transition to a permanent role after the program.

The Software Engineer will design and maintain backend APIs for Speechify's services, ensuring scalability and performance while collaborating with cross-functional teams.

Design, develop, and maintain robust backend APIs, oversee API performance, collaborate on B2B solutions, and align architecture with product strategy.

As a Software Engineer on the Platform team, you'll design, develop, and maintain backend APIs, enhance system performance, and collaborate across teams to align architecture with product strategy.

As a Senior iOS Engineer, you'll lead product decisions, ship production code, maintain architecture, and contribute to product discussions to enhance user experiences.

The role involves finding audio data sources, operating and extending cloud infrastructure, and collaborating to enhance data quality and models.

Design, implement, and optimize scalable application networking features (Ingress, DNS, private connectivity) for Elastic Cloud. Integrate security controls, conduct load and performance testing, troubleshoot network incidents, build tracing tools, and collaborate with cross-functional teams to meet application networking needs and improve observability and operability.

Software Engineers at QuantCo will design and develop scalable solutions, integrate models into client businesses, and improve products based on client feedback.

As an Ubuntu Core Software Engineer, you will design and implement features for the embedded Linux operating system, maintain boot mechanisms, debug system-level issues, and collaborate with a global team.

Design, build, and deploy production-grade agentic AI systems: multi-agent orchestration, RAG pipelines, provider integration, LLMOps, observability, and reusable patterns. Embed with client teams, lead design sessions, tune embeddings/vector search, manage cost/latency tradeoffs, and define metrics for accuracy, safety, latency, and cost.

Develop and optimize Go-based backend systems for an e-commerce platform. Collaborate with QA, refactor code, improve performance and stability, perform code reviews, and document software solutions.

As a Senior Tech Generalist, you'll build and maintain end-to-end systems, improve scalability, and ensure reliable financial operations while mentoring others in a dynamic team environment.

The Software Engineer will collaborate on backend technology products, building and supporting Monzo's banking platform, focusing on customer outcomes and efficient software development.

The Software Developer will develop IoT backend applications, manage production incidents, create documentation, and ensure best practices while being available 24x7 for service care.

The Senior Developer will design, develop, and maintain software solutions in Golang, collaborating with cross-functional teams to ensure code quality and system reliability while adhering to best practices.

Design and implement backend trading services, own features end-to-end (schema, API, tests, UI integration), contribute to real-time infrastructure and client-facing APIs, and write integration tests against real dependencies.

Join a growing team as a Junior Java Software Engineer, designing and coding Java applications, participating in Agile development, and ensuring code quality through TDD.

The Software Engineer role involves developing high-quality web and mobile applications, collaborating with cross-functional teams, and ensuring core engineering practices while maintaining a strong user focus.

Full-stack Developers at QuantCo build user interfaces for machine learning solutions, collaborating with data scientists and engineers to deliver actionable products.

Design, build, and operate enterprise-grade AI agents and agentic workflows. Integrate multiple LLM providers, implement retrieval/orchestration/tool invocation, and deliver cloud-native, containerized services (Kubernetes/Docker) with CI/CD, observability, and production support. Partner with clients to define use cases, prototype, deploy, measure KPIs, and share reusable patterns and documentation.

Responsible for designing, developing, and maintaining enterprise software applications, collaborating on projects, and building scalable systems. Experience with APIs, databases, and Agile methodologies is required.

Develop and integrate embedded autonomy software for UAS: design modular C/C++ and Python components, deploy on Linux/ROS2 and safety RTOS (POSIX/ARINC 653), bridge ROS2/DDS with non-ROS systems, automate MATLAB/Simulink code generation, and build CI/CD, tooling and platform abstraction layers for simulation and airborne hardware.

Develop, update and test flight simulation software and models for the Eurofighter. Implement C++ and Ada models, create unit/system/acceptance tests (C++/Python), perform integration and configuration management, develop test tools, coordinate with international partners, and produce lifecycle documentation.