Top Software Engineer Jobs in Barcelona

Develop and enhance front-end, server-side, and database applications, focusing on blockchain products while ensuring high performance and security.

Dragonfly is seeking Software Engineers for various portfolio companies, focusing on crypto technologies. Engineers of all experience levels are needed across multiple stacks.

As a Distributed Systems Engineer, you'll design and evolve LiveKit's core systems, implement resilient architectures, and enhance reliability and developer velocity, working on critical features in production environments.

The Senior Infrastructure Engineer will manage and scale LiveKit's core infrastructure, focusing on reliability and performance, while working on Golang code and automation for distributed systems.

Design and evolve core control, data, and observability systems; implement resilient region-spanning architectures; build libraries, protocols, and tooling; diagnose and harden critical paths using metrics, tracing, and testing; and shape platform capabilities across identity, scheduling, observability, and distributed state management.

Design, implement, and manage LiveKit's infrastructure, focusing on performance, reliability, and automation while ensuring effective incident management and coordination with vendors.

The role involves designing and evolving core systems at LiveKit, implementing resilient architectures, and building tools to enhance system reliability and developer speed. Strong distributed systems experience and programming skills are essential.

Design, implement, and operate low-latency, highly available distributed control, data, and observability systems. Build region-spanning architectures, libraries, protocols, and tooling; diagnose and harden critical paths using metrics, tracing, testing, and real traffic; and shape platform capabilities around identity, scheduling, observability, and distributed state management.

Design and implement scalable backend services and APIs with tight AI/LLM integration. Collaborate with product and data science teams to operationalize models, deploy microservices (Docker/Kubernetes), maintain CI/CD and reliability, mentor junior engineers, drive technical best practices, ensure security and compliance, and lead feature development and documentation.

Design, implement, and maintain scalable backend services and APIs with LLM/AI integration. Collaborate cross-functionally to operationalize AI models, lead projects, mentor engineers, ensure reliability, security, and CI/CD-driven deployments, and drive technical best practices.

Work as a Senior Software Engineer on a large-scale Ruby on Rails product: collaborate with product, implement and review code, prepare integration plans and estimates, run tests, and help define the roadmap while supporting rapid experimentation and scaling.

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

The Senior Software Engineer will design and implement systems for AI integration, build scalable backend services, and mentor team members, ensuring high-quality systems that meet user needs.

As a Senior Software Engineer, you will develop and manage a MongoDB solution on various platforms, ensuring reliability and security while contributing to a small team focused on impactful projects.

The Senior Software Engineer will build integrations with external APIs, optimize code performance, and maintain testing protocols. A focus on backend development is essential.

The Staff Software Engineer will design and manage end-to-end data pipelines, ensuring data quality and governance while collaborating across Java and Python systems, including event schema design and AI tooling.

Join a remote EU-based game studio talent pipeline as a senior C++ engineer working in custom engines or UE5. Maintain and develop game features and tools, collaborate across disciplines, and regularly debug, profile, and optimize code. Candidates may be contacted for future openings and will complete a technical test.

Lead the technical direction and implementation of Grafana's authentication systems (OAuth/OIDC/SAML/LDAP/SCIM). Build and operate low-latency, high-throughput Go services, drive cross-team architecture, mentor senior engineers, and ensure reliability, security, and scalability of identity at edge.

As a Senior or Staff Software Engineer focused on SRE, you will optimize performance, manage infrastructure with code, drive observability, and collaborate with teams to enhance system reliability and efficiency.

Build production-grade AI agent infrastructure for Fever’s Product Engineering organization, including agent harnesses, sub-agents, guardrails, evaluations, knowledge bases, cloud development environments, CI/CD delivery systems, observability, and measurement platforms. Optimize AI workflows for quality, speed, and cost while improving planning, coordination, and communication across engineering squads. Own backend systems end to end and establish engineering standards for reliable production software.

Design, develop, and maintain high-quality software for automated document-processing products. Collaborate with stakeholders to translate business needs into product improvements, contribute to architecture and technology decisions, conduct code reviews, optimize scalability and performance, lead major technical initiatives, mentor teammates, and improve engineering practices.

The Senior Software Engineer will contribute to product development, technical decisions, and help scale the company through clean and efficient coding in a collaborative environment.

The Senior Software Engineer role involves collaborating within a squad to enhance customer experiences through backend development, focusing on distributed systems and resilient software using various technologies.

Rover seeks a Lead/Senior Software Engineer with 7+ years of experience, specializing in frontend technologies like ReactJs and Python. Responsibilities include building customer-facing products, mentoring team members, and promoting engineering best practices. The role includes collaboration on projects and a commitment to inclusivity and diversity in the workplace.

The Senior Software Engineer will develop backend services for Workbot, engage in research, contribute through the development lifecycle, and enhance existing systems.