Top Software Engineer Jobs in Barcelona

Design, develop, and improve PaaS backend systems for the Vonage Video Platform. Implement features for API Gateway, media control, and signalling; optimize distributed architectures for scalability, reliability, and performance; instrument service quality; collaborate cross-team on signalling fabric; and adopt AI-assisted engineering to accelerate delivery.

As a Software Engineer, you will design and develop applications, write clean code, engage in code reviews, optimize systems, and explore new technologies in a remote team.

Lead full-stack development of cloud-native SaaS transportation solutions: prototype, design, build and deploy responsive React front ends and scalable C#/.NET back ends, implement REST APIs, optimize performance/security, use AI-assisted coding, and operate CI/CD and cloud infrastructure (Azure/Docker) in an agile international team.

Drive end-to-end performance and scalability testing for NVIDIA DGX Cloud across Kubernetes and NVIDIA components. Develop automated workload tests, monitoring and CI/CD frameworks, triage complex distributed-system issues, collaborate with customers and upstream open-source communities, and document and present findings.

As a Senior Software Engineer, you will lead backend development for the Merchant Data Platform, mentor junior engineers, ensure system reliability, and collaborate in product development. Your role involves project management, technical planning, and maintaining high availability of services.

Build production-grade machine learning systems that connect data pipelines to user-facing software. Design robust system architecture, implement model inference, ship resilient full-stack/cloud services, and collaborate on UX-driven solutions using Python, APIs, and AWS.

Design, build, and operate agentic AI systems and evaluation frameworks from prototype to production. Own AI features with focus on observability, cost, reliability, and failure recovery. Collaborate with product and domain teams to identify high-impact AI use cases and create org-wide patterns, tooling, and standards. Manage operational economics of AI systems and ensure scalable, serverless deployments.

Develop and maintain C# applications, design robust solutions with the team, write unit tests and occasional end-to-end test plans, conduct code reviews, and diagnose and resolve technical issues to ensure code quality and reliability.

Remote software engineer role building and enhancing Ukio's platform. Collaborate with cross-functional teams to design, develop, deploy features, drive automation and AI integrations, write maintainable code, troubleshoot and optimize systems, and deliver user-focused solutions while owning engineering initiatives.

Drive performance and scale characterization for NVIDIA DGX Cloud across Kubernetes and NVIDIA components. Build automated tests, monitoring, and CI/CD for large-scale GPU-accelerated workloads. Triage and resolve distributed systems performance issues, collaborate with researchers and upstream open-source communities, and present findings at conferences.

As a Staff Platform Engineer at Joko, you will lead platform efforts, ensure infrastructure reliability, enhance developer experience, and optimize costs, focusing on security and scalability while collaborating across teams.

As a Senior Engineer, you'll develop scalable, event-driven backend architectures, design low-latency APIs, and contribute to product development across the stack while optimizing performance and collaborating on AI features.

As a Software Engineer on the Platform team, you'll design, develop, and maintain backend APIs, enhance system performance, and collaborate across teams to align architecture with product strategy.

Own and build the core card spending experience: design and implement frontend and backend features, drive architecture and technical standards, improve reliability and SRE practices, coordinate cross-team deliveries, mentor engineers, and support banking integrations and complex transactional flows with a pragmatic, scalable approach.

As a Backend Software Engineer, you'll design scalable backend systems, optimize database performance, and collaborate with front-end and DevOps teams.

Contribute to Juju's development, collaborate with teams on distributed systems, debug issues, and enhance cloud automation features.

The Android Engineer will develop a native UI SDK for tracking services, focusing on reusable components and collaborating with designers and backend engineers.

Develop and maintain high-performance microservices, engage in the full software development lifecycle, and collaborate within autonomous teams. Understand service architecture and optimize solutions for scalability and resilience.

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.

Software Engineers at QuantCo will design and develop scalable solutions, integrate models into client businesses, and improve products based on client feedback.

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.

Design, build, and operate scalable, secure, event-driven backend services for mobile apps. Own end-to-end development lifecycle, improve architecture and CI/CD, write robust tests, mentor engineers, lead incident response, and integrate AI-assisted developer tools.

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

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

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.