Top Software Engineer Jobs in Spain

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.

As a Software Engineer II, you'll design, build, and maintain software while collaborating within a distributed system, ensuring quality and driving product features from development to production.

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 Software Developer will design and develop web applications, improve system reliability, and collaborate on architecture and deployment strategies.

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

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.

Define and document system requirements, develop and validate embedded software and control algorithms for air-to-water heat pumps, debug microcontroller code, verify prototypes and software behavior, and support communication protocol development (CAN, Modbus, UART) while collaborating with electronics and controls teams to meet product performance and safety targets.

Senior frontend developer responsible for designing and delivering high-quality Angular applications, mentoring teammates, driving frontend best practices, participating across the SDLC, ensuring code quality through reviews and testing, and working with CI/CD, APIs, and databases.

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 and ship frontend features that integrate LLMs and agentic workflows. Write high-performance TypeScript and React code, design AI-driven UX, define APIs with backend teams, and ensure quality through design, reviews, and testing.

Lead the design and development of ECG signal processing algorithms and embedded software for medical devices. Collaborate closely with clinical and engineering teams to ensure reliability and compliance with regulatory standards.

Develop cloud-based mobility solutions, participate in code reviews, troubleshoot issues, and ensure compliance with development standards and practices.

Design and develop high-impact web applications for a B2C trading platform, ensuring performance, reliability, and security while mentoring other engineers.

The System Software Engineer prepares customer analysis for traffic control software, develops customer-specific solutions, and supports project management and engineering teams throughout the project lifecycle.

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

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.

Design and develop backend services and APIs, enhance performance, collaborate with teams to align with product strategies, and manage B2B solutions.

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.

Lead architecture and develop flight test ground station software and frameworks, migrate desktop solutions to on-premise cloud, build multi-platform/web applications, integrate CI/CD, coordinate international technical teams, and act as liaison between test means, integrators, product owners, and customers to ensure scalable, robust flight test systems.

Build backend services and APIs to manage lifecycle of Qdrant Cloud clusters (provisioning, scaling, upgrades, backups, auth). Collaborate across teams, investigate production issues, and improve reliability, scalability, and usability of the cloud platform.

Build and integrate AI capabilities into the software development lifecycle for the PETS area: design LLM-driven developer tooling, MCP-based extensions, context engineering, LLM-integrated CI/CD, and test automation while collaborating with engineering, platform, and product teams to drive AI adoption.