Top Software Engineer Jobs in Spain

Build and operate production custody systems: signing service, key management, chain integrations, and transaction pipelines. Own end-to-end subsystems, integrate new chains, collaborate with cryptography on threshold signing and key recovery, write post-mortems, and produce clear async design docs and PRs.

The Senior Software Engineer will design and implement systems for AI integration, build scalable backend services, and mentor team members, ensuring high-quality systems that meet user needs.

Build AI-powered automation agents and modernize legacy enterprise systems for SME clients. Responsibilities include developing Python backends, integrating Salesforce, SAP, and Microsoft Dynamics, cleaning and transforming messy data, and delivering outputs through Power BI, PDFs, and APIs. The role involves working with LLMs, agent frameworks, and AI coding tools while collaborating with Spanish- and English-speaking clients in a fully remote consultancy environment.

Build and scale backend systems for AI-native construction procurement software. Own data models, GraphQL APIs, distributed processing semantics, integrations with construction ERPs, authorization, approvals, and transactional business workflows. Develop in Go with Postgres and AWS, while contributing to AI-driven document extraction, optimization, observability, and complex integrations. Collaborate in a fast-moving startup environment with evolving product requirements and strong ownership expectations.

Build core components of a diagnostic and personalization platform: backend data pipelines, frontends, services for genomic data ingestion, ML model integration, APIs, and cloud infrastructure. Collaborate with product and ML teams, iterate on prototypes and MVPs, and make architectural decisions supporting scalability and reliability.

Design and build the on-prem software stack for ModelVault appliances: containerized inference engines, model integration (LLMs/vision), deployment tooling, CLIs/GUI/APIs, OS and GPU setup, remote updates, telemetry, and collaborate with customers and founding team to iterate and scale the engineering org.

Design and build scalable microservices, APIs, and enterprise platforms using cloud-native technologies. Shape architecture, improve engineering and security standards, integrate internal and external systems, and own production reliability through observability and automation. Contribute to CI/CD and safe deployments, mentor engineers, and guide pragmatic technical decisions. The role also involves AI-powered engineering, evaluation-driven development, and building agentic AI products and services.

Develop and enhance iOS applications using Swift and SwiftUI while translating business requirements into technical designs. The role involves making technology and infrastructure decisions, documenting architecture, improving team efficiency, mentoring and identifying engineering talent, and collaborating with technical and business stakeholders in English and Spanish. Experience with APIs, third-party libraries, mobile architectures, Git, DevOps, and published iOS apps is required.

Lead Android application architecture and technical decisions; establish development, testing, monitoring, and change-management processes; collaborate with product teams; reduce technical debt; and improve engineering productivity. The role requires native Android development with Kotlin and Jetpack Compose, plus knowledge of system design, APIs, design patterns, declarative UI, Git, and DevOps. Full-stack, cloud, GraphQL, Firebase, and AI tooling experience are advantageous.

Develop and modernize native iOS applications using Swift and SwiftUI. Improve application performance, scalability, reliability, and delivery efficiency while integrating cloud services and advanced technologies. Collaborate with cross-functional teams, document technical decisions, and apply API design, MVVM, declarative UI, data structures, system design, Git, and DevOps practices. Familiarity with GraphQL, Firebase, full-stack development, and AI tooling is advantageous.

Owns complex full-stack software and enterprise engineering-platform solutions at Roche. Administers and improves Jira and Confluence across Atlassian Cloud, automates workflows, supports software delivery, and contributes to Data Center-to-Cloud migration. Drives small-to-medium initiatives, addresses technical debt and architecture challenges, mentors colleagues, manages stakeholders, and aligns technical strategies with global objectives in a regulated GxP environment.

Join Airbus Defence and Space to develop and validate real-time simulator subsystem models for A330 MRTT and C295. Responsibilities include software development in C/C++/Ada/Python on Linux, working with simulation tools and collaborating with systems engineering to deliver validated simulator products to internal and external customers.

Build and maintain developer tools across SDKs, React Email, CLI, MCP, integrations, and supporting backend services. Collaborate on APIs, compatibility, testing, releases, documentation, and shared tooling. Support developers through GitHub issues and pull requests while designing reliable interfaces, error handling, and backward-compatible experiences. The role also involves operating systems with authentication, retries, rate limits, queues, monitoring, and error recovery.

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.

Build and maintain software services and platforms for Stripe Tax. Own projects end to end, including scoping, design, implementation, and production deployment. Collaborate with product, design, infrastructure, marketing, and operations teams; debug production issues; improve operational health; pursue short- and long-term goals; and uphold engineering, security, and technical design best practices.

Provides technical leadership for Elastic UI, a React and TypeScript design system used across Elastic products. Owns component architecture, APIs, theming, accessibility, versioning, migrations, performance, and long-term maintainability. Partners with design and engineering teams, drives adoption, mentors engineers, leads architectural decisions, and improves developer experience. The role also explores AI-assisted design-to-code, accessibility, and migration workflows while maintaining high quality standards.

Design and develop C/C++ software for 3D smart cameras and ARM-based embedded systems, including sensor integration, graphical interfaces, shared 3D visualization libraries, and common platform components. Implement features, automated tests, and technical designs while contributing to reviews, planning, process improvement, and team mentoring. The hybrid role is based in Girona, Spain, with three onsite days weekly.

Own the end-to-end GNSS receiver software architecture, develop acquisition, tracking, navigation, positioning, and interference-mitigation algorithms, and optimize embedded implementations for low-power chipsets. Lead architectural trade-offs across software, hardware, and silicon constraints; oversee C/C++ implementation on RTOS, bare-metal, and FPGA platforms; mentor engineers; and collaborate with product management, leadership, and customers on roadmap and technical direction.

Develop and maintain Airbus in-house simulation software for aircraft loads and aeroelastics. Responsibilities include translating flight physics requirements into numerical algorithms, designing software architecture, coding, automated testing, deployment, user support, troubleshooting, and performance optimization. The role requires collaboration with aerospace engineers and application of modern software engineering practices across the full development lifecycle.

Leads full-stack engineering for AI-enabled assisted banking platforms. Owns architecture, technical strategy, modernization of legacy systems, cloud-native distributed services, API integrations, reliability, security, observability, and production delivery. Builds with TypeScript, React, Next.js, Node.js, .NET, event-driven systems, and cloud infrastructure. Influences architecture across teams, mentors engineers, resolves ambiguity, drives engineering standards, and applies AI-assisted development throughout the software lifecycle.

Lead architecture and hands-on engineering for a large-scale ATM network transformation. Design secure, resilient, cloud-native distributed systems; modernize legacy platforms; build Java-based integrations, APIs, event-driven services, infrastructure, observability, and automated delivery pipelines. Provide technical direction across teams, apply AI-assisted engineering and agentic tooling, improve reliability and maintainability, and mentor engineers while shaping architecture for ATM switching, routing, reconciliation, real-time data, and cash-management capabilities.

Leads architecture and hands-on development of AI-enabled, cloud-native full-stack platforms for assisted banking. Owns technical direction, modernization of legacy systems, distributed services, APIs, integrations, reliability, security, and production operations. Mentors engineers, influences multiple teams, and develops scalable customer and branch experiences using React, Next.js, Node.js, TypeScript, .NET, cloud infrastructure, event-driven systems, and agentic AI tools.

Own and evolve Trust & Safety systems for trade verification, review processing, and content moderation. Design reliable event-driven workflows, improve monitoring and authentication, diagnose distributed production issues, and lead incident response. Partner with vetting and reviews teams while delivering full-stack services using TypeScript, Node.js, Next.js, Datadog, SQL, and GCP. Help identify systemic risks early and improve team effectiveness through strong engineering practices and AI-assisted development.

Build and scale healthcare insurance products across claims management, insurance offers, and customer enablement. Design reliable systems, collaborate across teams, contribute to product decisions, mentor engineers, lead complex projects, and support hiring. Work with Python, JavaScript, React, React Native, PostgreSQL, and related web technologies in a product-focused engineering environment.

Build and evolve secure, scalable digital banking platforms, services, APIs, and GraphQL subgraphs used by millions of customers. Lead technical direction across services and mobile architecture, remain hands-on in delivery, mentor engineers, and improve testing, CI/CD, observability, automation, and engineering practices. Own systems through production while solving complex problems and applying modern AI-assisted engineering approaches.