Top Software Engineer Jobs in Spain

Own and deliver backend identity systems for international markets, shaping technical direction, designing distributed, highly available services, and collaborating with product, design, and analytics. Improve reliability, performance, and operational health; participate in on-call rotation; set code and design standards; mentor and grow engineers; reduce toil and create runbooks/playbooks. Drive cross-team collaboration to meet regulatory and market-specific identity/KYC requirements.

Build and maintain hardened Ubuntu-based container images and the automated CI/CD pipelines to build, test, scan, sign, publish, and retire them. Integrate upstream open-source projects, ensure security and cloud-native compatibility, collaborate with cross-functional teams, document and share knowledge, mentor colleagues, and contribute to hiring. Work in a distributed agile environment with occasional travel.

Join the team to design and develop backend and frontend features using Django/Python and React. Produce production-quality code, implement new features, work with PostgreSQL, DynamoDB, Redis, Kubernetes and AWS, and follow agile weekly releases. On-site in Paris with initial training in Barcelona.

Design, develop, test, debug, and maintain scalable software solutions in an Agile team; participate in code reviews, support reliability and performance improvements, and collaborate with international teams.

Lead and deliver Repayment UX features for Affirm's mobile products using React Native. Own quarterly goals, guide engineers through ambiguous problems, collaborate with product/design/analytics, ensure operational reliability (metrics and on-call), improve engineering standards, and mentor teammates to drive high-quality, scalable mobile experiences.

Own and build the Android client for an AI-first app: implement AI features (chat, vision, voice), optimize performance and memory, design UX for streaming and partial results, integrate backend APIs, instrument analytics/logging, and collaborate with backend and ML teams to ensure stability, security, and scalability in production.

The Software Engineer will design and develop software architectures, solve complex challenges, lead technical directions, and collaborate with different teams to optimize efficiency and impact.

As a Staff Mobile Engineer at Joko, you will lead mobile application development using React Native, focusing on scalability, performance, and user experience while collaborating with cross-functional teams.

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.

Six-month full-time graduate program for final-year or recent engineering graduates. Work in production from day one, contribute to global-scale systems, learn from experienced engineers, and develop foundations in backend development, testing, CI/CD, cloud, and best practices. Potential transition to a permanent role after the program.

Own the full software development lifecycle for JetBrains identity and access services. Develop and operate reliable Kotlin-based services, with some Go, supporting authentication, authorization, organizations, memberships, groups, and workspaces. Design new platform features, improve existing production systems, review code, manage integrations, and address JVM and PostgreSQL performance in distributed, multi-tenant SaaS environments.

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.

Develop and optimize Go-based backend systems for an e-commerce platform. Collaborate with QA, refactor code, improve performance and stability, perform code reviews, and document software solutions.

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 Software Developer will develop IoT backend applications, manage production incidents, create documentation, and ensure best practices while being available 24x7 for service care.

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.

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.

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.

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

Staff Software Engineer responsible for leading architectural evolution across a distributed rendering platform, contributing to core backend systems, and improving performance, reliability, scalability, testing, and delivery practices. The role includes mentoring engineers through pairing and design reviews, unblocking teams, shaping technical strategy, improving CI/CD and tooling, and aligning engineering investments with product and business goals.

Build and maintain integrations for North's agentic platform, own the end-to-end integration pipeline, create evals and tests to ensure reliability, tune tool descriptions, and help other engineers add and maintain integrations while using AI responsibly to improve performance and quality.

As a Staff Software Engineer, you will define engineering vision, lead large projects, ensure code quality, and mentor engineers while enhancing the scalability of the platform.