Top Software Engineer Jobs in Barcelona

Senior full-stack product engineer owning features end-to-end: research customer problems, write product specs and wireframes, design and implement frontend and backend solutions, collaborate with product, design and infra, and ship high-quality, scalable features for tens of thousands of users.

Implement and optimize EVM-compatible features, reduce gas usage, develop and test smart contracts, collaborate on Ethereum infrastructure, and provide technical support.

Develop and optimize Soroban smart contracts and integrate anchor services on the Stellar network for cross-border payment solutions. Collaborate with cross-functional teams, test and debug smart contracts, document development processes, provide technical support, and stay current with blockchain and payments technology trends to ensure secure and efficient implementations.

Build and maintain high-security mobile wallet apps using React Native, Swift, or Kotlin. Implement biometric authentication and secure key storage, collaborate with cross-functional teams, debug performance issues, and propose UX and security improvements.

Lead design and implementation of autonomy software for mobile robots, developing motion planning, state estimation, obstacle avoidance, and mission execution. Ship and maintain production C++/Python systems, triage field issues, evaluate AI techniques, mentor engineers, and drive autonomy architecture and technical strategy for real-world deployments.

Dragonfly is seeking Software Engineers for various portfolio companies, focusing on crypto technologies. Engineers of all experience levels are needed across multiple stacks.

Seeking software engineers with at least 2 years of production backend experience, interested in crypto and blockchain technologies, for roles with portfolio companies.

Develop and maintain backend services and platforms for Wi‑Fi network design and optimization. Contribute to architecture, implement scalable microservices on AWS, work with device data and APIs, debug production issues, collaborate with cross-functional teams, and mentor junior engineers.

Senior iOS Engineer needed to build a native Tracking UI SDK, manage architecture, conduct mentorship, and ensure high-quality deliverables through collaboration and testing.

Build backend services and APIs to manage lifecycle of Qdrant Cloud clusters (provisioning, scaling, upgrades, backups, auth). Collaborate across teams, investigate production issues, and improve reliability, scalability, and usability of the cloud platform.

Develop core backend components for a blockchain network, focusing on networking, reliability, scalability, and high-quality software practices.

The role involves building self-service platform services using Go, automating operational workflows, scaling Kubernetes, and ensuring reliability in cloud environments.

In this role, you'll translate product requirements into technical specifications, architect changes, write high-quality Python code, mentor junior engineers, and oversee AI coding agents while monitoring application performance and logs.

The Sr. Software Developer will design, develop, and deliver features for a Mobile Application Security Platform, focusing on both frontend and backend systems. Responsibilities include building scalable services, writing maintainable code, and collaborating with cross-functional teams to enhance product performance and usability.

The Senior Software Engineer will develop backend services for Workbot, engage in research, contribute through the development lifecycle, and enhance existing systems.

The Senior Software Engineer will contribute to product development, technical decisions, and help scale the company through clean and efficient coding in a collaborative environment.

Design, deliver, and maintain reliable Java microservices for finance core and reconciliation. Define engineering standards, improve repositories, drive automation to reduce manual reviews, mentor teammates, and ensure correctness, scalability, and auditability of financial logic.

Rover seeks a Lead/Senior Software Engineer with 7+ years of experience, specializing in frontend technologies like ReactJs and Python. Responsibilities include building customer-facing products, mentoring team members, and promoting engineering best practices. The role includes collaboration on projects and a commitment to inclusivity and diversity in the workplace.

The Senior Software Engineer role involves collaborating within a squad to enhance customer experiences through backend development, focusing on distributed systems and resilient software using various technologies.

Develop and maintain Java backend applications using TDD and clean code principles, participate in full SDLC within Agile/Scrum teams, design technical solutions, deliver sprint increments, support component consumers, and improve team practices.

As a Software Engineer, you'll develop software for Ceph and distributed storage, collaborating with a global team to enhance cloud solutions.

The role involves designing and building AI-focused research tools, optimizing performance, engaging with customers, and scaling product features quickly.

The Backend Engineer will design scalable infrastructure for AI research tools, collaborate on optimizing system performance, and own evaluation pipeline automation.

Build and maintain backend-first features and integrations for Triptease's marketing channels. Work across the full stack (primarily backend), design scalable distributed systems, implement CI/CD on cloud platforms, collaborate closely with product teams, pair program, write tests (TDD), and contribute to squad strategy and product quality.

Canonical is hiring a Software Engineer to develop features for Kubernetes, focusing on operators and integrations while collaborating in a distributed team.