Top Software Engineer Jobs in Barcelona

Lead design and implementation of an automation platform to orchestrate package creation, test generation, and image builds. Build LLM-integrated tooling, write production Go for CLIs and services, develop test generators and validation frameworks, and drive roadmap and engineering quality across a small team.

As a Senior Software Developer/Scrum Master, you will lead the development team through the software lifecycle using Agile methodologies, design high-quality code in C#, and ensure continuous improvement while facilitating team dynamics.

Lead the migration of software from C# to Rust, design high-performance systems, and mentor developers while maintaining coding standards and software quality.

Join Roche as a Senior Software Developer, driving the software development lifecycle, collaborating in Agile teams, and enhancing healthcare technology solutions.

As a Senior Software Engineer at Rewardful, you'll improve infrastructure, optimize performance, implement scalable solutions, and develop new features for our SaaS affiliate management platform.

Senior Software Engineer to design and implement C++/Python software, accelerate workloads with CUDA, develop and maintain Linux kernel modules and system services, optimize system and GPU performance, manage Linux systems, mentor junior engineers, and integrate AI technologies across products.

Lead architecture and implementation of platform modernization from a .NET monolith toward a unified Java/Spring stack. Design zero-downtime migration patterns, build and transition services, collaborate with product and distributed teams, implement observability with Grafana and tracing, and leverage agentic programming tools to accelerate refactoring and development.

Lead design and improvements for Elasticsearch distributed systems, focusing on scalable, performant, and resilient indexing, cluster coordination, replication, and debugging of concurrency and performance issues. Own projects end-to-end and support cross-team engineering and support staff.

Build core components of a diagnostic and personalization platform: backend data pipelines, frontends, services for genomic data ingestion, ML model integration, APIs, and cloud infrastructure. Collaborate with product and ML teams, iterate on prototypes and MVPs, and make architectural decisions supporting scalability and reliability.

Design and build the on-prem software stack for ModelVault appliances: containerized inference engines, model integration (LLMs/vision), deployment tooling, CLIs/GUI/APIs, OS and GPU setup, remote updates, telemetry, and collaborate with customers and founding team to iterate and scale the engineering org.

As a Senior Software Engineer, you will design, develop, and implement features for the core products using NodeJS and Java while ensuring clean and efficient code. You will participate in monitoring deployments, collaborate in an agile environment, and contribute to technical decisions.

Develop and enhance MAAS core components, improve architecture, collaborate across teams, and ensure high standards in documentation and CI practices.

As a Staff Unity Client Engineer, you will own game features and collaborate across teams for high-quality game client development, focusing on full lifecycle responsibilities.

Join Filigran as a Senior Software Engineer to develop a scalable XTM Suite platform using TypeScript and Python. You'll focus on architecture and community engagement while innovating cybersecurity solutions.

The role involves improving Firefox development workflows, mentoring team members, collaborating across teams, and analyzing development data.

Design and implement core Web3 protocol features and secure smart contracts in Solidity. Integrate blockchain solutions with cross-functional teams, ensure scalability and performance, stay current on EVM internals, conduct code reviews, and mentor junior engineers.

Design, build, and maintain production-grade Go services and Kubernetes operators to provision and govern database and streaming resources across AWS and GCP. Improve scalability, reliability, automation, and developer experience for distributed systems and streaming ecosystems while collaborating with product, security, and engineering teams.

Develop data-oriented code in Python, maintain data pipelines, perform NLP tasks, and build machine learning models to support AI solutions.

Design and implement a video processing engine, develop a cross-platform rendering engine, integrate systems, and optimize performance while collaborating with other engineers.

Design and build key features for an AI coding platform, focusing on user experience and product growth in a collaborative environment.

Be the hands-on technical owner of the LiteAPI product: design, implement, and operate backend/API infrastructure, lead technical decisions, work closely with product, stakeholders, and customers, and mentor engineers while shipping high-impact features in a fast-moving startup.

Design and develop scalable backend services, integrate AI capabilities, and improve existing systems. Collaborate across teams to enhance the CMC platform.

Design, develop, and maintain Python and Go microservices for data ingestion and processing; integrate backend services with BigQuery and cloud data platforms; implement REST APIs; build scalable data processing pipelines using Apache Beam and Dataflow; test and troubleshoot distributed systems; review designs, estimate work, mentor junior developers, and drive performance and reliability improvements.

Develop core backend components for a blockchain network, focusing on reliability and scalability, mainly using Rust. Ensure code quality through testing and debugging.

The Senior Software Engineer will design and develop high-quality web and mobile applications, ensuring code quality while collaborating with product teams and mentoring junior engineers.