Top Software Engineer Jobs in Barcelona

As a Senior Tech Generalist, you'll build and maintain end-to-end systems, improve scalability, and ensure reliable financial operations while mentoring others in a dynamic team environment.

The Software Engineer will collaborate on backend technology products, building and supporting Monzo's banking platform, focusing on customer outcomes and efficient software development.

The Senior Developer will design, develop, and maintain software solutions in Golang, collaborating with cross-functional teams to ensure code quality and system reliability while adhering to best practices.

Join a growing team as a Junior Java Software Engineer, designing and coding Java applications, participating in Agile development, and ensuring code quality through TDD.

The Software Engineer role involves developing high-quality web and mobile applications, collaborating with cross-functional teams, and ensuring core engineering practices while maintaining a strong user focus.

Develop, test, integrate, and support robotic controls software for automated lift trucks in an embedded environment. Responsibilities include vehicle control communication, simulation, requirements development, software and electrical architecture, code and design reviews, supplier leadership, manufacturing support, and mentoring entry-level engineers. The role requires C/C++ development, robotics sensors and SLAM experience, embedded control systems, network communications, and MATLAB/Simulink/Stateflow expertise. Occasional travel may be required.

Lead design and delivery of real-time fraud decisioning services and APIs, extend decisioning platform to international markets, integrate regional risk vendors and ML/AI signals, own platform tooling and availability, mentor engineers, collaborate cross-functionally, and participate in on-call rotation.

Build features, prototypes, and demos using modern AI coding tools and agents; iterate prototypes into reliable, scalable production; direct and evaluate AI coding agents; collaborate closely with founders and senior engineers; explore and improve AI development workflows to accelerate product delivery.

Build and architect Base360.ai: design and launch booking, pricing, payments, operations, and AI-powered automation. Integrate platforms (Airbnb, Stripe, Twilio, OpenAI), scale systems internationally, and embed AI workflows to automate operations and optimize revenue.

Seeking a Full-Stack Software Engineer to build the core of an Agentic AI Platform. Responsibilities include frontend and backend development, product design collaboration, and infrastructure management with a focus on clean, maintainable code.

Design and implement features for scalable games, ensuring quality, performance, and security, while collaborating in an agile environment.

Design and build scalable backend services using Node.js and MongoDB. Collaborate with teams for technical solutions, and ensure reliable architecture with clean code.

You will lead engineering efforts for backend system development, collaborate with global teams, ensure operational availability, and develop talent on your team.

Design and scale mission-critical market data services for stocks, options, crypto, and foreign exchange. Responsibilities include architecting backend systems and APIs, maintaining software quality and test coverage, participating in code reviews, and troubleshooting incidents and bugs. The role uses Go and Python with REST, gRPC, WebSockets, SSE, Docker, Kubernetes, Google Cloud, BigTable, Prometheus, Grafana, and ELK.

Design, build, and maintain scalable, low-latency backend services using Node.js and AWS (EC2, Lambda). Implement event-driven architectures with SQS/SNS, use DynamoDB for high-performance data, develop RESTful APIs, monitor and optimize performance, and participate in code reviews and cross-functional collaboration.

Build and maintain API integrations and the connectivity platform linking EV chargers, vehicles, and OEMs. Improve reliability, observability, and scalability; develop automations and internal tools for monitoring and triage; define SLAs and alerting; collaborate with product and engineering teams to balance stability and delivery.

Defines, develops, and maintains scalable software architecture for autonomous mobile robots and automated guided vehicles. Responsibilities include technology roadmaps, navigation systems, third-party integrations, embedded software, HMI applications, industrial communications, cybersecurity, and interoperability standards such as VDA5050. The role collaborates with multidisciplinary engineering, manufacturing, quality, fleet management, and project teams while promoting modern software practices and agile methodologies.

Design and implement robust Rust services and libraries for trading, payments, and crypto consumer experiences. Build scalable, low-latency distributed systems, write efficient testable code, ensure security and reliability, debug across the stack, collaborate with product teams, own systems end-to-end, and mentor other engineers.

Lead architecture and backend development for international core systems, ensuring high availability, concurrency, security, and scalability. Design Java/Spring Boot services, optimize performance, integrate MySQL/Redis/Kafka, manage technical risk, drive productization, mentor engineers, and coordinate with suppliers and product teams. Onsite role in London supporting European operations.

Build and maintain the software backbone for an industry-leading visual SLAM system: write high-quality C++/Python code, implement performance optimizations, develop automated integration and benchmark tests, create tooling for logging/KPI tracking and data analysis, and collaborate with SLAM experts to integrate and validate algorithmic components.

Develop, prototype, and deploy sensor calibration algorithms and tooling for autonomous mobile robots. Write and maintain high-quality C++, Python (and Rust) code, debug calibration issues, perform root-cause analysis, and deploy solutions on ARM64 SoCs while collaborating with global teams and SLAM experts.

Full‑stack engineer responsible for building and owning elastic.co features end-to-end: React front‑end, backend services, CI/CD, production instrumentation, security triage, on‑call incident response, and collaborating with product and design to deliver scalable, secure web experiences.

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.

Lead and deliver backend features for Repayment Scheduling: design and implement highly available distributed systems, collaborate with product/design/analytics, own operational reliability and on-call duties, mentor engineers, set quality standards, and drive technical decisions and delivery.

Build and own end-to-end features across backend and frontend: design backend services and data models (Python/Django), implement RESTful APIs, create reusable frontend components (TypeScript/React), write tests, participate in code reviews, maintain production reliability and security, and collaborate with product and design.