Top Software Engineer Jobs in Barcelona

Design and develop high-impact web applications for a B2C trading platform, ensuring performance, reliability, and security while mentoring other engineers.

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.

The Software Engineer will develop and maintain web applications visualizing sustainability data, contributing to global conservation efforts. Ideal for entry-level candidates with a recent degree.

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

Lead design and development of low-level Linux instrumentation and eBPF-based runtime security features for detection, monitoring, and workload protection. Drive architecture, implement performance-sensitive systems, establish testing methodologies, deliver end-to-end features, and provide technical leadership and cross-team collaboration across Datadog's security products.

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

The role involves optimizing hardware support within a software stack for AI model deployment, collaborating with teams and hardware vendors to enhance performance and portability across platforms.

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 build scalable, secure .NET-based web applications and REST APIs. Partner with multidisciplinary teams and clients to translate requirements into high-quality solutions, using Azure services and ORM technologies like Entity Framework. Advocate for modern practices, contribute to architecture, and support continuous learning and product development.

Build and operate agentic AI systems and features from prototype to production within a serverless AWS environment. Design orchestration, memory, durable state, failure recovery, and evaluation frameworks. Collaborate with product and domain engineers to identify AI opportunities, manage operational economics (latency, token cost), and contribute org-wide AI patterns, tooling, and standards.

Build and ship full‑stack features for North, an enterprise AI workspace. Develop secure autonomous agents, execution engines, integrations, observability and evaluation systems. Collaborate with researchers to productionize models and deliver performant, low‑resource deployment code while adhering to strict security and privacy constraints.

As a Growth Software Engineer, you will scale user and business growth through experimentation, data-driven development, and cross-functional collaboration, particularly in user engagement and retention.

The AI Software Engineer will develop and improve Joko's AI shopping assistant, focusing on architecture, evaluation, data management, and personalized user experiences, while collaborating with product teams.

As a Software Engineer II, you'll develop backend and frontend applications, support API layers and integrations, and collaborate with cross-functional teams to enhance the product's performance.

Own and evolve the GDPR Orchestrator platform: design and operate its core engine, safety mechanisms, and observability. Build docs, templates, and self-serve tooling so product areas manage data rules. Coordinate cross-area requirements with legal, security, and data teams. Improve platform developer experience, safety, and scale integrations across data stores and third-party systems.

The Lead Software Engineer will develop AI-driven software solutions, focusing on backend systems, microservices, and collaborating with cross-functional teams to influence strategic decisions.

Responsible for the design, development, and maintenance of electrical systems, using control theory for desired system behavior, while ensuring team and customer focus.

As a Software Engineer on the Engineering Efficiency team, you will develop tools to streamline processes and enhance productivity for Qonto's engineers. Your role includes measuring success and ensuring quality while maintaining end-to-end ownership of deliverables.

The Lead Golang Software Engineer develops server solutions, leads technical designs and code reviews, mentors colleagues, and ensures the quality of engineering practices in the Commercial Systems unit.

The Python Software Engineer will develop and maintain test automation tools for hardware certification and improve Linux testing methods.

You will build and maintain container images, automate CI/CD processes, engage with the community, and mentor junior team members in a collaborative environment.

Drive process improvement, coach colleagues, and manage features in a distributed system for cloud automation and software operations.

Lead Python Software Engineer responsible for developing solutions, collaborating on designs, mentoring team members, and enhancing engineering practices.

Develop and enhance dqlite, a distributed SQLite database, including debugging, implementing features, and engaging with the open source community.

Own availability and performance of mission-critical services, improve scalability and observability, build platform tooling, practice sustainable incident response, participate in on-call rotation, collaborate with product teams, and follow FinOps best practices.