Top Software Engineer Jobs in Spain

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.

Leads test strategy, framework architecture, and platform quality initiatives for Akamai’s cloud-native Compute platform. Partners with leaders and architects on testing roadmaps, mentors engineers, establishes automated continuous deployment testing standards, and advances scalable testing methodologies. Requires expertise in test automation, software platform engineering, CI pipelines, infrastructure, networking, Kubernetes, cloud-native services, Python, Go, Linux, and security principles.

Design and build the vCluster Platform using Kubernetes internals and Go. Own features end to end from technical design through release, solve complex systems architecture problems, contribute to open-source projects, and develop scalable tenant isolation and resource-sharing solutions. The role requires autonomous technical problem solving, strong Kubernetes expertise, and participation in a high-growth startup environment.

Architect and develop production-grade business systems across Salesforce, NetSuite, and integrated enterprise platforms. Build quoting, subscription, and entitlement engines; create automation pipelines and API integrations; establish architecture, security, documentation, and code-review standards; and translate commercial policies into scalable technical solutions. The role partners with Finance, Sales Operations, Customer Success, and product stakeholders while maintaining system reliability, auditability, observability, and production readiness.

Software engineering intern contributing to real-time distributed systems and RTI Connext products. Responsibilities include developing prototypes, validating approaches, implementing features, writing tests, participating in engineering teams and training, and learning professional software development processes. The role emphasizes high-performance, scalable commercial software, computer networking, operating systems, and continuous integration practices.

Design, implement, test, and ship Firefox security and hardening features for enterprise users. Improve security architecture across operating systems, including privilege isolation, trust boundaries, cryptographic protocols, WebPKI, and security-sensitive web APIs. Investigate security issues, resolve root causes, and improve browser reliability, performance, memory usage, and correctness in a complex multithreaded codebase.

Develops high-integrity embedded real-time software for airborne connectivity and communications systems. Responsibilities span software requirements, design, coding, verification, configuration, documentation, testing, target implementation, and change management. The role collaborates with product managers, systems engineers, program managers, and validation teams, contributes to project planning, supports software delivery, and leads architectural and development decisions. Occasional national and international travel is required.

Build full-stack data and AI applications, platform services, APIs, GenAI capabilities, and cloud-native infrastructure for Sanofi’s OneMesh ecosystem. Responsibilities include developing with React, TypeScript, Node.js, Python, and FastAPI; implementing RAG and agent orchestration; deploying on AWS and OpenShift; maintaining Terraform infrastructure and CI/CD pipelines; and ensuring security, observability, reliability, and production readiness. The role collaborates with data, machine learning, product, and business teams.

As a Senior Software Developer/Scrum Master, you will lead the development team through the software lifecycle using Agile methodologies, design high-quality code in C#, and ensure continuous improvement while facilitating team dynamics.

Develop and maintain high-performance full-stack software across the complete lifecycle, including architecture, implementation, testing, debugging, and continuous maintenance. Translate requirements into technical specifications, write robust C# code, ensure test coverage, participate in Agile planning, conduct code reviews, and use AI-supported tools to improve development and troubleshooting. The role requires advanced expertise with C#, WPF, .NET, SQL Server, Entity Framework, Git, and Agile methodologies.

Build secure, scalable full-stack authentication experiences across CommBank’s digital channels. Design React and Next.js applications alongside Node.js backend-for-frontend services, REST APIs, and GraphQL integrations. Own system design, token and session security, cloud-native distributed services, testing, observability, CI/CD, and reliability. Influence architecture and technical direction, collaborate across engineering teams, mentor engineers, and help deliver authentication capabilities including login, multifactor authentication, and passkeys.

Own the frontend architecture and production delivery of a multi-brand consumer platform built with React, Next.js, and TypeScript. Responsibilities include creating a configurable multi-brand system, owning a design system and component library, converting AI-built prototypes into production features, using AI coding agents, and ensuring high UI quality, performance, accessibility, and Core Web Vitals. The role requires autonomous end-to-end ownership and daily production coding.

Develop and maintain features for Smadex’s real-time bidding platform using Node.js and Java. Responsibilities include writing tested code, participating in code reviews and architectural decisions, monitoring deployments, supporting production reliability, and collaborating in an agile environment. The role requires Linux, Git, Docker, Docker Compose, testing, and CI/CD experience, with AWS and in-memory database knowledge as advantages.

Build and operate full-stack software for clinical trial products, including backend services, APIs, data pipelines, React applications, and production AI/LLM features. Establish AI-assisted development standards, prompt engineering patterns, evaluation frameworks, and code quality gates. Support observability, reliability, CI/CD, infrastructure collaboration, secure regulated development, testing, code reviews, and mentoring.

Develop and operate full-stack software for clinical-trial products, building backend services, APIs, streaming pipelines, and React applications. Integrate production AI and LLM capabilities, establish prompt engineering and evaluation practices, and improve reliability, observability, CI/CD, security, and compliance. The role includes troubleshooting, code reviews, mentoring, and shaping AI-assisted engineering standards in a regulated environment.

Develop and verify high-integrity embedded software for airborne connectivity and communications systems. Responsibilities span software requirements, design, coding, testing, configuration, documentation, change management, and target implementation. The role collaborates with product managers, systems engineers, and validation teams, supports project planning and delivery, and contributes to architectural decisions and innovation. Occasional national and international travel is required.

Build and maintain Ergodic AI’s AI platform across back-end and front-end systems. The role involves developing with Python web frameworks and JavaScript/TypeScript, integrating with client technology stacks and workflows, applying AI, ML, and LLM concepts, and contributing to DevOps, cloud deployment, testing, and infrastructure practices. As an early-stage hire, the engineer will help shape the product and solve complex data and AI challenges.

Own complex full-stack features across MediaRadar’s Insights Studio platform, lead migration of Creative Intelligence, consolidate applications onto ClickHouse, and optimize performance for large advertising datasets. Use Claude Code in daily agentic development, deploy systems on Azure or AWS, mentor engineers, and drive testing, observability, documentation, and engineering standards while collaborating across international teams.

Design and implement large-scale browser-based rendering infrastructure to execute and extract structured content from JS-heavy web apps. Improve rendering quality, performance, cost, and throughput at internet scale and productionize rendering research.

Leads the design and delivery of scalable full-stack software, with a strong frontend focus using React, TypeScript, and Next.js. The role influences architecture, engineering standards, cloud and platform direction, and modern practices such as CI/CD, testing, observability, and DevSecOps. It involves mentoring engineers, partnering with product and architecture stakeholders, supporting production platforms, and contributing to customer channels, data services, and AI-enabled business banking experiences.

Build AI agents, reusable agent platforms, and automated workflows across the software development lifecycle. Develop integrations with codebases, APIs, MCPs, internal tools, and engineering systems. Prototype and scale AI capabilities, while designing context management, orchestration, verification, and human-in-the-loop mechanisms for safe, reliable automation. Measure agent effectiveness and collaborate with engineering, product, design, and data teams to identify automation opportunities and drive adoption.

Develop and maintain highly available, scalable API services for a global payments platform. Design and ship new products, improve platform performance, automate development processes, and deliver secure, testable, documented software. Collaborate with international technology teams and stakeholders while applying Agile practices, evaluating technologies, and supporting reliable 24/7 transaction processing.

Design and develop clean, maintainable software for automated document-processing products. Collaborate with business stakeholders to translate requirements into product improvements, conduct code reviews, guide technical direction, mentor colleagues, and improve engineering practices. The role uses Golang, MySQL, Docker, Kubernetes, cloud infrastructure, and GitHub CI/CD while emphasizing product ownership, clean architecture, software craftsmanship, and technical communication.

Design, build, and ship production-grade full-stack software integrated with agentic AI systems and LLM APIs. Use AI-assisted development throughout the software lifecycle, evaluate AI-generated outputs, and manage reliability, latency, token, and cost considerations. Own delivery from design through production support, track AI productivity KPIs, collaborate in Agile client environments, and contribute reusable components, knowledge bases, and AI tooling standards.

Build and own React Native features for Kraken’s consumer mobile app, from product discovery through launch, measurement, and iteration. Partner with Product and Design to create responsive, trustworthy financial experiences using dynamic or real-time data. Guide development for a new Asian-market app, including regional UX, connectivity restrictions, vendors, and telemetry. Contribute to architecture, performance, reliability, code reviews, and product engineering standards.