Top Software Engineer Jobs in Spain

Design, develop and operate scalable Python backend services, REST APIs and cloud-native infrastructure for connected health devices. Improve performance, observability, deployment pipelines and system reliability; collaborate across Product, AI, Embedded and Frontend teams; mentor engineers and drive architectural decisions through production deployment.

Lead and evolve QA strategy and automation frameworks across backend, frontend and embedded systems. Design and maintain automated tests, integrate into CI/CD, define release acceptance criteria and quality gates, perform functional/regression/integration testing, analyze production issues, monitor quality metrics, and promote a quality-first culture.

Design, develop, and maintain cloud-based APIs, microservices, and integrations. Contribute to system architecture, write maintainable code, perform testing/debugging/optimization, mentor junior engineers, participate in code reviews, and collaborate with cross-functional teams to deliver scalable solutions using DevOps and cloud automation practices.

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.

Senior full‑stack product engineer owning large product areas end-to-end: research, specs, wireframes, implementation, and shipping reliable features. Collaborate with product, design, and infra; balance speed and quality; solve ambiguous customer problems and build scalable abstractions.

Design and build responsive, high-performance frontend applications with React/Angular while contributing to backend services in Java/Spring Boot. Lead frontend architecture, optimize performance and accessibility, mentor engineers, collaborate across teams, and support CI/CD and cloud deployments for scalable, user-centric products.

Build and scale the internal developer platform: create tools, services and automation (CI/CD, canaries, feature flags, access workflows) using IaC (Pulumi/Python) and Kubernetes to enable safe, fast shipping. Drive platform initiatives, mentor teams, lead AI tool adoption for engineering, participate in on-call and design/code reviews, and ship major improvements across the organization.

Lead optimization of concurrent systems, scale backend microservices, and collaborate with developers and engineers on deployment for retail solutions.

Build and evolve the Elastic MCP server, agent skills platform, and developer-facing integrations (language clients, CLI, third-party integrations). Implement tooling, linting, and eval-backed correctness, collaborate with product and external partners, and contribute across Go/Rust codebases to improve developer experience and observability.

Senior-level software engineer responsible for designing, developing, and maintaining scalable Java-based microservices and APIs. Collaborates with product and analytics, mentors junior engineers, participates in SDLC and code reviews, and ensures API security and quality. Works across cloud (AWS), containers, frontend/mobile (React/React Native, iOS/Android), and DevOps practices.

Design, implement, and optimize Elasticsearch core storage and query engine components for observability workloads. Lead architecture, resolve performance bottlenecks, mentor engineers, drive cross-organizational initiatives, triage community issues, and write idiomatic modern Java to improve indexing, storage efficiency, and query performance.

Design, implement, and own end-to-end backend features in a Python-based, event-driven platform. Improve architecture for performance, reliability, and scalability, participate in design reviews, mentor peers, ensure CI/CD and testing best practices, and collaborate with Product and Data teams to deliver production-ready services.

Build and maintain Finance & Compliance services to calculate revenue, invoice partners and customers, automate tax reporting, and ensure scalable, reliable transaction processing. Design end-to-end features, participate in architecture, improve observability and performance, and mentor teammates while owning core components.

The Senior Software Engineer will collaborate in small teams to develop and maintain backend and frontend components, focusing on high-availability systems, writing tests, and continuous delivery on Google Cloud Platform.

Design, implement, test, and maintain cloud-first web applications. Build secure, maintainable code using event-driven architecture and cloud services (AWS/Azure). Collaborate with cross-functional teams, mentor junior engineers, and support CI/CD and PWA development.

Design, develop, and maintain backend and mobile software systems. Lead and mentor engineers, follow SDLC and agile/DevOps practices, build secure REST/JSON APIs, perform advanced debugging, refactor code, and collaborate with product and analytics.

Develop cloud-native production systems that process large data volumes. Engage in backend development with Rust and frontend with Angular. Collaborate on product development.

As a Senior Software Engineer, you'll design and build scalable market data systems, improve API architecture, and enhance overall system performance, contributing to Alpaca's infrastructure for trading financial assets.

Build and maintain core post-trade clearing systems and securities-finance infrastructure. Own projects end-to-end, design reliable distributed services and RESTful APIs, integrate new clearing partners, participate in on-call rotation, and improve systems to enable new product offerings.

Lead the development of software solutions for a logistics platform, overseeing technical strategy, mentoring teams, and ensuring high-quality software delivery.

Build and maintain scalable backend systems that integrate real-time data, machine learning, and optimization models to optimize renewable and battery storage operations. Own architecture through deployment and maintenance, collaborate with engineers and data scientists, troubleshoot performance issues, and improve monitoring, reliability, and system performance.

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.

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.

Build and own end-to-end features across Sona’s platform using AI-assisted development. Direct and correct agent-produced code, work cross-functionally, engage customers in discovery and workshops, and contribute across scheduling, payroll, HR, and mobile domains.

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.