Top Software Engineer Jobs in Barcelona

Design, build, and operate a large-scale Kubernetes platform: ensure high availability and performance, automate platform delivery, develop custom Kubernetes Operators in Go, manage production incidents, and run Day 1/Day 2 cluster operations with Helm and GitOps tooling.

Leads the design, development, maintenance, testing, troubleshooting, and optimization of complex full-stack software applications. Collaborates with cross-functional teams, documents technical requirements, resolves IT issues, prepares data, supports end users, and applies software architecture, microservices, database, CI/CD, containerization, monitoring, and Agile engineering practices.

Develop and maintain Smadex’s real-time bidding platform by designing and implementing features with NodeJS and Java. Write tested, efficient code; participate in code reviews and architectural decisions; monitor deployments; and support production reliability and performance. Collaborate within an agile engineering team while contributing to planning, progress reporting, and continuous platform improvement.

Develop and maintain secure, scalable Salesforce enterprise software across the full delivery lifecycle. Design architectures, write clean code, implement asynchronous processing, conduct testing, document solutions, and participate in Agile planning, reviews, releases, and continuous improvement. Collaborate cross-functionally, contribute to engineering standards and communities of practice, and support the development of other engineers.

Design and develop scalable backend systems for a B2B application using Java and Spring. Participate in architectural decisions involving performance, security, and scalability; apply agile practices; mentor developers; optimize relational database performance; and support cloud and DevOps initiatives, particularly on AWS.

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.

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.

Owns the CI/CD and release infrastructure roadmap, technical vision, security gates, artifact provenance, and organizational adoption. Directs engineers through complex, multi-quarter projects, leads incident response for supply-chain and release issues, and raises engineering standards through mentorship and reviews. Remains hands-on with code, prototyping, debugging, and production issues while improving developer productivity, release safety, and infrastructure scalability.

Lead the modernization of business-critical legacy PHP systems into scalable Node.js and Next.js architectures. Provide hands-on coding, architectural guidance, API and microservices design, debugging, refactoring, and incremental migration leadership. Translate undocumented business logic into maintainable solutions, leverage AI-assisted development tools, communicate trade-offs to stakeholders, establish engineering standards, and mentor additional engineers.

Develop and maintain a software test automation framework for medical software. Responsibilities include building automated UI, API, integration, endpoint, and end-to-end tests; improving test architecture; troubleshooting failures; managing complex environments and test data; and exploring AI-assisted testing workflows. The role requires close collaboration with developers and engineers, strong ownership, debugging ability, and continuous improvement of testing practices.

Build and ship backend features for enterprise Coder deployments, including database migrations, observability, reporting, auditing, security, scalability, and reliability improvements. Investigate production issues, resolve operator problems, document designs, participate in code reviews and RFC discussions, and join on-call rotations. The role requires professional Go development, concurrency knowledge, SQL expertise, debugging ability, and strong communication.

Lead the design, implementation, operation, and technical direction of complex, scalable game platform systems. Improve reliability, performance, security, and delivery standards; collaborate across product and engineering disciplines; and mentor engineers. The role requires strong software engineering fundamentals, deep object-oriented programming experience, and experience shipping and operating production systems. Cloud, distributed systems, large-scale data, and modern web framework experience are beneficial.

Senior Software Engineer on Elastic’s Elasticsearch Performance team, developing and implementing code- and architecture-level optimizations for distributed search systems. Responsibilities include profiling, benchmarking, regression detection, performance modeling, vector search optimization, and building AI-assisted optimization tools. The role requires deep Java and JVM expertise, concurrency knowledge, distributed systems experience, and collaboration across engineering teams.

Build and maintain backend collections systems to manage delinquent loans, implement recovery strategies, ensure high availability and reliability, collaborate with product and risk teams, participate in on-call rotation, write well-tested extensible code, and contribute to team growth.

Build front-end experiences and backend services for integrating prediction markets into MetaMask. Develop scalable APIs, real-time data feeds, transaction signing, and secure on-chain protocol integrations. Optimize performance, security, and high-volume transaction throughput across mobile, web, and browser clients while collaborating within an agile, distributed engineering team.

Build and operate backend pricing systems for real energy contracts. Responsibilities include designing the Pricing API, consolidating pricing logic, improving quote speed, implementing error handling and observability, creating alerting, explaining pricing failures, and supporting live incidents. The role requires production Python backend experience, FastAPI, SQL, data-heavy systems, end-to-end project ownership, and AI-assisted development workflows.

Develop and enhance MetaMask social and multi-chain experiences across Portfolio, browser extension, and mobile platforms. Collaborate across teams on complex projects, mentor engineers, and build scalable full-stack applications using React, React Native, modern JavaScript, blockchain technologies, APIs, testing, and continuous integration. Ensure cross-platform compatibility and apply web security best practices.

Lead technical strategy and architecture for global cloud-native eCommerce platforms. Make critical technical decisions, champion microservices, APIs, CI/CD, DevOps, cybersecurity, observability, and testing practices. Mentor senior engineers, align engineering with product and business goals, and represent engineering with external partners and vendors. The role supports scalable digital experiences connecting patients and healthcare professionals to medicines and vaccines worldwide.

Designs and develops backend services for Elastic’s Streams data pipeline, Logstash, and OpenTelemetry Collector using Java, JRuby, and Golang. Responsibilities include solving distributed systems problems, improving code and dependencies, maintaining test coverage, reviewing pull requests, collaborating across teams, supporting enterprise customers, and participating in on-call rotations.

Build and evolve Rerun’s open-source viewer, cross-language SDKs, and integrations with Rerun Hub. Develop high-performance interfaces for large-scale multimodal data, optimize workflows across desktop and web, make full-stack architecture decisions, and collaborate with backend, Hub, design, customers, and the open-source community. The role involves UI development, rendering, data handling, infrastructure, real-time applications, visualization, and performance optimization.

Develop and optimize software solutions for industrial additive manufacturing in an agile team. Responsibilities include designing algorithms, data structures, and software subsystems; debugging complex issues; benchmarking and improving performance, stability, efficiency, and scalability; and contributing to software quality and documentation. The role uses Vue.js, TypeScript, Python, C++, MongoDB, Docker, and automated development tools.

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

Build and deploy software for Stripe’s financial infrastructure, specializing in frontend or related technical areas. Collaborate on multi-person coding projects, learn unfamiliar systems, contribute to large codebases, participate in code reviews, and safely update production systems. New graduates are expected to apply strong programming fundamentals, communicate clearly, use AI tools responsibly, and solve complex technical problems with increasing independence.

Lead the design, development, and maintenance of Java backend services and REST APIs within a microservices architecture. Drive architectural decisions, engineering best practices, cloud deployment on AWS, CI/CD, system optimization, reliability, and technical risk mitigation. Collaborate with product, architecture, QA, DevOps, and frontend teams while mentoring engineers and contributing to an Agile greenfield product.

Develop and maintain scalable frontend web applications and data visualization platforms using React, Redux Toolkit, and Vite. Collaborate with cross-functional teams, implement features, write tests, conduct code reviews, troubleshoot issues, and support RESTful APIs. Contribute to agile processes, accessibility, user experience improvements, and continuous development while using AI tooling responsibly and staying current with modern web technologies.