Top Software Engineer Jobs in Spain

Develop and maintain moderately complex full-stack features across UI, business logic, databases, and external interfaces. The engineer will use Python, cloud platforms, SQL, testing, deployment, and code review practices while collaborating with Product, Data, and Engineering teams. The role offers exposure to AI agentic systems, advertising technology, media intelligence, and globally distributed development.

Build and maintain core tax product features across frontend or backend systems. Own work from discovery and technical design through implementation, release, monitoring, and iteration. Collaborate with product, design, and engineering teams, contribute to technical strategy, improve developer experience, and use AI-assisted tools responsibly for development, testing, debugging, and documentation. Help deliver scalable, maintainable software and mentor teammates in effective engineering practices.

Lead the development of Runware's serverless platform by building core systems for AI workload management and providing technical guidance to the team.

Lead development of Runware’s AI platform, including scalable backend APIs, SDKs, developer tools, and inference orchestration systems. Design high-performance distributed architectures, optimize image and video model integrations, improve reliability and observability, shape technical direction, and mentor engineers. Collaborate across platform, infrastructure, and product teams to deliver robust developer experiences and maintainable systems.

Develop and maintain Smadex’s real-time bidding platform using Java and NodeJS. Responsibilities include owning features, writing tested and efficient code, participating in code reviews and architectural decisions, monitoring deployments, ensuring production reliability, and collaborating in an agile engineering team.

Develop cross-platform telecommunications applications for network optimization, automation, performance monitoring, data analytics, and visualization. Work with multidisciplinary telecom and software teams using Python, SQL, cloud technologies, Elastic Stack, and modern software development practices across 2G, 3G, 4G, 5G, and Open RAN environments. Troubleshoot development and production issues and support projects for wireless operators and vendors across Spain and Europe.

Design, develop, test, and maintain scalable business-critical applications using .NET, C#, Angular, SQL, and REST APIs. Collaborate with product owners, architects, and engineers on technical design and architecture. Optimize databases, support CI/CD and DevOps practices, troubleshoot production issues, conduct code reviews, and improve software quality through automation, testing, and engineering best practices.

Develop and support scalable MES applications, reporting solutions, CI/CD pipelines, and event-driven integrations for global manufacturing operations. The role involves Java and SQL development, troubleshooting integrated systems, root-cause analysis, documentation, process improvement, and collaboration with engineering, DevOps, and manufacturing teams.

Analyze anti-bot and bot-mitigation systems, identify how websites detect and block scraping activity, and develop repeatable testing and bypass approaches. Build a greenfield agentic environment for evaluating anti-bot behavior, contribute to backend systems at scale, investigate complex incidents, and communicate findings clearly. The role requires deep web protocol knowledge, strong Node.js, TypeScript, and Python skills, scientific problem-solving, AI coding agent proficiency, and independent execution in a remote-first team.

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.

Senior Software Engineer to design and implement C++/Python software, accelerate workloads with CUDA, develop and maintain Linux kernel modules and system services, optimize system and GPU performance, manage Linux systems, mentor junior engineers, and integrate AI technologies across products.

Staff Software Engineer responsible for designing, building, and operating distributed market data systems. The role focuses on real-time blockchain data ingestion, streaming, normalization, storage, APIs, reliability, data correctness, observability, incident recovery, and production support. The engineer will lead technical decisions, mentor teammates, translate ambiguous requirements into designs, and use AI-assisted development throughout the software lifecycle.

Build and maintain distributed backend applications using Go, Elixir, Ruby, or other languages. Design architectures, integrate AI and LLM services, improve reliability and performance, use agentic coding tools, manage production deployments, troubleshoot infrastructure, and contribute to monitoring, on-call practices, peer reviews, and engineering culture. Collaborate with data scientists, mentor junior developers, and make sound technical and product decisions in a fast-paced environment.

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.

Design, develop, test, and maintain scalable .NET and Angular applications. Responsibilities include database optimization, REST API development, architectural contributions, CI/CD and DevOps support, troubleshooting production issues, code reviews, and continuous quality improvement. The role collaborates with cross-functional teams and requires strong expertise in C#, .NET, Angular, SQL, software architecture, REST APIs, Git, and modern engineering practices.

Own end-to-end migration of business domains from a legacy desktop ERP to a modern web ERP. Design data models, APIs, tenant isolation, cutover and rollback plans; execute safe live-data migrations; maintain production reliability; review backend and frontend code; collaborate with Product; mentor engineers; and occasionally modify legacy C++ code.

Develop and maintain enterprise web and server applications using Java, Spring, PostgreSQL, REST or GraphQL, and distributed application technologies. Responsibilities include architecture and solution design, full software lifecycle development, code reviews, testing, documentation, CI/CD pipelines, troubleshooting, and production support. The engineer will contribute to standards, mentor junior staff, collaborate cross-functionally, and provide technical guidance on software quality, security, performance, and best practices.

Lead full-stack engineering for scalable digital experiences, building React, Vue, or Angular front ends and .NET, Node.js, or Python back ends. Develop APIs, microservices, reusable components, CI/CD pipelines, automated tests, observability, and infrastructure automation. Set technical standards, guide architecture, mentor engineers, improve reliability and performance, and partner with product, design, and architecture teams. Explore AI enablement, programmable networks, data-driven UX, and developer tooling.

Owns end-to-end test strategy, designs scalable backend and UI automation frameworks, integrates automated testing into CI/CD pipelines, performs exploratory testing, and advocates for testability and reliability across engineering and product. The role requires strong programming, Kubernetes and distributed-systems knowledge, debugging ability, and cross-functional ownership in a fast-moving startup.

Develop functional models for SoC architectures, write embedded software to validate simulations, improve test automation through scripting, debug models and test cases, and document engineering work. Collaborate with engineers on networking, 5G, AI/ML, and cloud-oriented platforms while gaining experience with processor simulation, ARM architecture, firmware, compilers, and network protocols.

Build backend services, internal developer platforms, tooling, CI/CD systems, testing capabilities, and paved paths using Python. Improve developer experience, productivity, and the software delivery lifecycle through cloud-native, distributed systems and AI-driven workflows. Collaborate with engineering teams as platform users, use data and feedback to measure effectiveness, and influence architecture and technical decisions.

Lead the end-to-end design, development, operation, and optimisation of scalable consumer card platforms. Provide hands-on technical leadership, shape engineering strategy, mentor engineers, and improve cloud-native, full-stack, DevSecOps, testing, observability, and AI-assisted development practices. Build modern applications using Next.js, TypeScript, C#, .NET, AWS, GraphQL, microservices, and event-driven architectures supporting millions of daily transactions.

Lead test framework architecture and continuous execution pipelines for cloud platform features. Define automation standards, shape quality engineering strategy, mentor engineers, and improve release stability. Build automated testing frameworks using Python, Pytest, Go, or Bash, with emphasis on highly available Kubernetes services, containers, cloud-native technologies, Linux systems, networking, security, and CI/CD practices.

Design and develop the core vCluster Platform, focusing on Kubernetes internals, tenant isolation, container orchestration, and scalable resource-sharing systems. Build high-performance Go software, own features from technical design through release, solve complex systems-architecture problems, and contribute to open-source projects. The role requires autonomous technical leadership, active collaboration with the Kubernetes community, and experience in high-growth startup environments.

Lead development of scalable web applications and GraphQL APIs using JavaScript, React, Node.js, AWS, and PostgreSQL. Own product architecture, performance, reliability, CI/CD, testing, and engineering standards while mentoring junior developers. Collaborate with stakeholders, provide technical direction, build reusable solutions, and independently drive projects in an agile environment.