Top Software Engineer Jobs in Barcelona

Lead backend engineering for Card Acquisition: define technical strategy, deliver quarterly goals, mentor engineers, collaborate with product/design/analytics, build scalable highly available systems, ensure operational excellence (monitoring, on-call, playbooks), and promote quality through standards and tooling.

Lead technical strategy and architecture for customer migrations to a cloud-native card issuing platform. Design scalable, reliable distributed systems; establish engineering standards and architectural patterns; evaluate trade-offs; mitigate technical risks; align cross-team dependencies; partner with stakeholders; unblock complex initiatives; mentor senior engineers; improve testing, observability, code quality, incident response, and operational readiness; and contribute hands-on to critical systems.

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.

Design, develop, and maintain high-quality web applications using CodeIgniter and PHP. Collaborate with cross-functional teams to define and ship features, ensure application performance and quality, identify and fix bugs, and maintain code quality and automation.

Build and ship native Android features for an AI Neobank using Kotlin. Design clean user journeys for financial services, integrate backend APIs, improve performance and reliability, use analytics to iterate, and implement on-device AI where it improves UX.

Designs and executes manual and automated tests for cloud-based and desktop software products. Builds test automation, validates backend systems and data using SQL and NoSQL databases, and partners with developers, product teams, DevOps, and QA professionals. Maintains test documentation, identifies risks, supports software reliability, and contributes to continuous improvement of QA processes and tools.

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.

As a Senior Scala Developer, you will design and optimize aggregate systems for data analytics, enhancing query performance and system reliability in cloud environments.

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.

Design, develop, and maintain full‑stack serverless features; own implementation plans; write testable code; improve observability and scalability; troubleshoot issues; conduct code reviews; mentor juniors; participate in CI/CD, containerisation, and DevOps workflows.

Owns technical direction and hands-on execution for major products and systems. Designs scalable, reliable architectures across backend, frontend, APIs, databases, and infrastructure; writes code; leads architecture decisions; solves complex production problems; improves engineering quality; and mentors engineers across teams.

Own technical direction and execution for major products and systems. Design scalable, reliable architectures, write production code, lead engineering initiatives, make technical trade-offs, solve complex production issues, improve engineering quality, and mentor engineers across teams. The role is hands-on, remote, globally distributed, and requires strong English communication.

Lead technical direction and hands-on execution for major products and systems used by millions of users. Responsibilities include designing scalable and reliable backend, frontend, API, database, and infrastructure solutions; writing and reviewing code; making architecture trade-offs; resolving production issues; improving testing, security, observability, and development practices; and mentoring engineers across teams.

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

Build and scale Base360.ai: design APIs, services, and cloud-native infrastructure; implement event-driven automations, AI-powered workflows, and integrations (Airbnb, Stripe, Twilio, OpenAI). Own projects end-to-end to automate operations, improve pricing and guest experiences, and enable global scaling.

Build and ship end-to-end features and agentic automations for North, Cohere's AI workspace for finance. Integrate financial data sources, enforce data isolation and RBAC, collaborate with Product/UX/ML/Sales, work with finance customers, ensure reliability/security/auditability, and iterate on platform capabilities using AI where appropriate.

Build and maintain North's Agents & Automations platform: design and ship frontend and backend features, execution engine, integrations, debugging, observability, evaluation, and feedback systems to enable reliable AI-powered workflows.

The role involves designing and implementing features, debugging, maintaining documentation, and collaborating with the community in the Mir graphics stack.

Build, maintain, and integrate automated UI and API test suites into CI/CD pipelines. Collaborate with developers and QA to ensure risk-based coverage, analyse results, optimise automation for scalability, and contribute to QA strategy and continuous improvement within a remote, Agile team.