Top Software Engineer Jobs in Barcelona

As an Ubuntu Core Software Engineer, you will design and implement features for the embedded Linux operating system, maintain boot mechanisms, debug system-level issues, and collaborate with a global team.

Build and maintain scalable backend services and web ecosystem components for a high-throughput ad-tech platform. Integrate Agentic AI (LangChain, AWS Bedrock), ensure cloud security (AWS WAF, CloudFront), own features end-to-end from architecture to deployment, and collaborate across teams to preserve data integrity and performance.

Design and implement backend trading services, own features end-to-end (schema, API, tests, UI integration), contribute to real-time infrastructure and client-facing APIs, and write integration tests against real dependencies.

Full-stack Developers at QuantCo build user interfaces for machine learning solutions, collaborating with data scientists and engineers to deliver actionable products.

Design, build, and maintain production-grade software for quantum and AI products; architect APIs and service-level systems; deploy and harden containerized applications; collaborate with ML, DevOps, and platform teams; mentor engineers; and solve high-value industry problems for enterprise customers.

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.

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.

Develop, test, and maintain secure, scalable Salesforce enterprise software across the full delivery lifecycle. Responsibilities include architecture, hands-on coding with Apex, Visualforce, and Lightning Components, asynchronous processing, automated testing, documentation, Agile collaboration, code reviews, clean-code practices, and deployment. The role also involves contributing to engineering standards, continuous process improvement, knowledge-sharing communities, and mentoring other developers.

Build and maintain integrations for North's agentic platform, own the end-to-end integration pipeline, create evals and tests to ensure reliability, tune tool descriptions, and help other engineers add and maintain integrations while using AI responsibly to improve performance and quality.

As a Staff Software Engineer, you will define engineering vision, lead large projects, ensure code quality, and mentor engineers while enhancing the scalability of the platform.

As a Senior Software Engineer, you will build scalable systems, mentor engineers, and ensure high availability of data pipelines, collaborating with cross-functional teams.

Lead and deliver quarterly goals for a backend team building low-latency payment and ledger systems. Design, implement, and operate scalable backend services, collaborate with product/design/analytics, own on-call and availability, set code/design standards, and mentor engineers.

Lead backend engineering for EU cards: set technical strategy, design low-latency transaction and ledgering systems, ensure operational reliability (monitoring, on-call, playbooks), collaborate cross-functionally, mentor engineers, and drive code and design quality across teams.

Design, build, and maintain performant React/Redux/Vite web applications and data-visualization portals. Collaborate across teams to implement features and RESTful APIs, write tests, perform code reviews, debug complex issues, follow agile and CI/CD practices, refine UX details, and adopt tooling to speed development.

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.

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.

Maintain, validate, and troubleshoot production Machine Vision and Machine Learning inspection applications. Execute testing, simulation, and cybersecurity patch validation; develop automation and deployment tools; implement software modifications; collect and analyse operational data; produce test documentation and reports; and collaborate with IT Security, infrastructure, and global ML/inspection teams to sustain performance and drive continuous improvement.

As a Senior Software Engineer, architect modernization efforts, transition codebases, collaborate with product teams, and ensure system reliability using observability tools.

The Software Engineer will develop backend systems using Rust, manage multimodal data, and improve data infrastructure with a focus on performance and design ownership.

Canonical seeks open-source enthusiasts to optimize Ubuntu for new silicon technologies, collaborating with teams and customers to enhance software quality and performance across various platforms.

Design and develop services for automating work with a large server fleet while engaging in DevOps processes.

Design and develop services for monitoring servers, improve metrics pipelines, automate maintenance workflows, and investigate incidents to ensure infrastructure reliability.

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 backend engineering for Card Acquisition: define technical strategy, deliver quarterly goals, mentor engineers, collaborate with product/design/analytics, build scalable highly available systems, ensure operational excellence (monitoring, on-call, playbooks), and promote quality through standards and tooling.