Top Software Engineer Jobs in Spain

Design, integrate, and validate software/feature blocks by reviewing requirements, performing robust design and validation, supporting technical architecture and standards, running simulations/coding/tests, performing worst-case/statistical and thermal analyses, supporting design reviews with suppliers, reporting task progress, and escalating risks.

Build and enhance GraphAware Hume, a graph-powered analytics platform. Responsibilities include developing APIs, designing secure and scalable access-control systems, orchestrating workflows for graph analytics and real-time insights, optimizing application performance, contributing to architecture and technical design, and collaborating with distributed engineering teams.

The Backend Engineer will develop and maintain features for Restream web services, design backend APIs, ensure infrastructure resilience, and contribute to a collaborative team environment.

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.

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

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.

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.

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.

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.

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.

Lead the architecture, development, and delivery of scalable backend systems, APIs, data pipelines, and services supporting global 3D and computer vision applications. Drive technical direction, system performance, resiliency, observability, and maintainability. Mentor senior engineers, conduct architecture reviews, lead cross-functional initiatives, influence hiring and team growth, and shape engineering culture and long-term technical vision.

The Senior Software Engineer will design and develop high-quality web and mobile applications, ensuring code quality while collaborating with product teams and mentoring junior engineers.

The Senior Software Engineer will lead development initiatives, manage technology processes, and ensure effective collaboration with business partners while focusing on improving database operations and client engagement.

Build and maintain user-facing features and interfaces for Restream web services. Design and implement UI and business logic, collaborate with product designers and engineers, perform code reviews, improve reliability and scalability, and evaluate emerging technologies.

The Lead Software Engineer will develop AI-powered software, focusing on backend systems, APIs, microservices, and collaborating in agile teams to deliver technical solutions.

The Lead Software Engineer will develop AI-powered software solutions, design backend systems, and collaborate with cross-functional teams to enhance AI capabilities.

Join the Kubernetes product team to design and implement Kubernetes operators and addons, write high-quality Golang and Python code, debug issues, collaborate with a distributed team, mentor colleagues, and contribute to open-source integration and lifecycle management. Travel 2–4 weeks yearly for team events.

Build and maintain services and tooling to automate and secure network lifecycle across data centers. Implement CI/CD, staged rollouts, drift detection, observability pipelines, and APIs that integrate network source-of-truth with the cloud platform. Collaborate with network engineers and SREs to turn operational pain into production-grade automation and tooling.

Build production-ready web features for Backbase Digital Banking and Wealth platforms using AI-assisted development. Implement Angular/TypeScript frontend components, integrate backend microservices and REST APIs, write and run unit/integration tests, ensure accessibility, security, and performance, and collaborate in a cross-functional Scrum squad while leveraging LLM tools and automated toolchains to accelerate delivery.

Lead architecture and delivery of AI-native Android SDKs and mobile components. Integrate LLM workflows and agentic AI tooling, own end-to-end mobile capabilities, enforce high automated test coverage and performance profiling, mentor engineers, and drive mobile CI/CD and security standards.

Design and build scalable, secure .NET-based web applications and REST APIs. Partner with multidisciplinary teams and clients to translate requirements into high-quality solutions, using Azure services and ORM technologies like Entity Framework. Advocate for modern practices, contribute to architecture, and support continuous learning and product development.

Work on Percona's open-source MongoDB operational tools (primarily ClusterSync and also Backup). Build and harden a Go-based replication engine handling initial cloning and continuous change streams, ensure correctness and fault tolerance at scale, support sharded clusters, optimize performance and resource usage, and maintain CLI/HTTP APIs, metrics, logging, tests, and packaging. Collaborate openly via GitHub pull requests and JIRA.

As a Growth Software Engineer, you will scale user and business growth through experimentation, data-driven development, and cross-functional collaboration, particularly in user engagement and retention.

The AI Software Engineer will develop and improve Joko's AI shopping assistant, focusing on architecture, evaluation, data management, and personalized user experiences, while collaborating with product teams.

Develop core backend components for a blockchain network, focusing on networking, reliability, scalability, and high-quality software practices.