Top Software Engineer Jobs in Spain

Senior full-stack product engineer owning features end-to-end: research customer problems, write product specs and wireframes, design and implement frontend and backend solutions, collaborate with product, design and infra, and ship high-quality, scalable features for tens of thousands of users.

Senior full‑stack product engineer owning large product areas end-to-end: research, specs, wireframes, implementation, and shipping reliable features. Collaborate with product, design, and infra; balance speed and quality; solve ambiguous customer problems and build scalable abstractions.

Design and build responsive, high-performance frontend applications with React/Angular while contributing to backend services in Java/Spring Boot. Lead frontend architecture, optimize performance and accessibility, mentor engineers, collaborate across teams, and support CI/CD and cloud deployments for scalable, user-centric products.

Build and ship browser-based 3D interactive features using React, Three.js, and WebGL; integrate frontend with a C++ computational backend on AWS; use AI tools (Claude Code) to accelerate development; prototype AI-powered product features; and collaborate with clinical scientists, UX, ML engineers, and QA.

Build foundational agent infrastructure for an AI assistant: orchestration, tool execution, context management, evaluation, and trust/permissions. Ship reliable, observable, and secure backend systems, launch agentic features, own core infrastructure, participate in on-call, and mentor others.

Design, build, ship, and maintain end-to-end product features across frontend, backend, and data layers. Own projects from definition through production, improve reliability and scalability, collaborate with product and design, mentor engineers, and engage with customers to solve real user problems.

Lead optimization of concurrent systems, scale backend microservices, and collaborate with developers and engineers on deployment for retail solutions.

Verify embedded software for datacenter power-management systems by defining test specifications, developing automated tests and frameworks (Python/PyTest), automating CI/CD, analyzing results, documenting root cause, and authoring test reports and release sign-offs.

Verify embedded software for datacenter power-management systems by defining test specs, developing automated tests and frameworks (Python/PyTest), integrating CI/CD, analyzing defects, authoring reports, and signing off releases to ensure security, reliability, and real-time performance.

Develop and maintain the backend of the Lending product at SumUp, improving functionality, performance, and scalability while integrating with external partners.

Build and maintain Discover features end-to-end, focusing on React/Redux frontend expertise and full-stack development with Node.js. Architect databases, collaborate with product/design/QA, write tests and clean code, drive AI-led improvements, optimize performance, and reduce architecture complexity.

Design, build, and maintain scalable back-end systems (PHP/Laravel/MySQL) and front-end features (React/TypeScript). Develop APIs, write unit tests, manage dependencies, contribute to architecture and code reviews, and apply AI-assisted development tooling to accelerate delivery while ensuring code quality and maintainability.

Build and evolve the Elastic MCP server, agent skills platform, and developer-facing integrations (language clients, CLI, third-party integrations). Implement tooling, linting, and eval-backed correctness, collaborate with product and external partners, and contribute across Go/Rust codebases to improve developer experience and observability.

Improve reliability, observability, and scalability of Enode's connectivity layer. Build and maintain API integrations with OEMs and energy partners, reduce incidents, enhance monitoring and alerting, drive complex projects to release, uphold code quality and testing, collaborate with product, and mentor teammates while applying AI tooling strategically.

Senior-level software engineer responsible for designing, developing, and maintaining scalable Java-based microservices and APIs. Collaborates with product and analytics, mentors junior engineers, participates in SDLC and code reviews, and ensures API security and quality. Works across cloud (AWS), containers, frontend/mobile (React/React Native, iOS/Android), and DevOps practices.

Design, implement, and optimize Elasticsearch core storage and query engine components for observability workloads. Lead architecture, resolve performance bottlenecks, mentor engineers, drive cross-organizational initiatives, triage community issues, and write idiomatic modern Java to improve indexing, storage efficiency, and query performance.

Work as a senior full‑stack engineer on Search & Recommendation: design, build, deploy, monitor and maintain scalable frontend and backend systems (SSR/SPAs), deliver high-quality code, collaborate in agile squads, and improve search/recommendation user experiences using the team's tech stack.

Lead design and delivery of resilient, scalable home-lending systems. Build secure TypeScript/Node.js/GraphQL services, own full lifecycle from architecture through production, mentor engineers, modernize legacy platforms to cloud-native, and apply automation and observability to ensure reliability across high-volume financial workflows.

Senior full-stack engineer responsible for end-to-end design and delivery of cloud-native, secure lending platform features using TypeScript, React, Node.js and GraphQL. Drive architecture, scalable microservices, CI/CD, automated testing, observability, and GenAI initiatives. Mentor engineers, ensure production readiness, and collaborate across product, design, and security to deliver high-performance fintech experiences.

Design, implement, test, deploy, and maintain cloud-native full‑stack applications. Collaborate cross-functionally, follow software engineering best practices, use event-driven patterns, leverage AWS, participate in code reviews, troubleshoot issues, and improve CI/CD workflows.

Lead design and development of scalable, user-friendly iOS applications for clinical and customer use. Define technical architecture, implement and optimize features, build modular frameworks, ensure high quality via automated tests, apply Apple design and accessibility standards, and collaborate with cross-functional teams in agile processes.

Design, build and operate cloud-native services, APIs and data products to enable customer identity resolution and master data management. Deliver scalable, secure event-driven microservices, participate in design and code reviews, champion observability and reliability, modernise legacy platforms, mentor engineers and drive CI/CD, IaC and workflow orchestration (e.g., Temporal) adoption.

Design, build and operate cloud-native services, APIs and data products for customer identity resolution and master data management. Deliver scalable, secure microservices and event-driven solutions, use CI/CD and IaC, participate in design and code reviews, improve observability and reliability, modernize legacy platforms, mentor engineers, and collaborate with product, data and platform teams. Experience with workflow orchestration (Temporal) and streaming is advantageous.

Lead technical direction and architecture for institutional lending, pricing and ESG platforms. Design scalable, secure APIs and integrations, modernise legacy systems, champion AI-enabled SDLC, DevSecOps, observability and automation, mentor engineers, and collaborate with product, risk and business stakeholders to deliver resilient lending solutions.

As a Senior Software Engineer, you will build scalable distributed systems, improve developer experience, mentor peers, and lead incident responses.