Top Software Engineer Jobs in Spain

Lead design and development of scalable, user-friendly iOS applications for clinical and customer use. Define technical architecture, implement and optimize features, build modular frameworks, ensure high quality via automated tests, apply Apple design and accessibility standards, and collaborate with cross-functional teams in agile processes.

Design, build and operate cloud-native services, APIs and data products to enable customer identity resolution and master data management. Deliver scalable, secure event-driven microservices, participate in design and code reviews, champion observability and reliability, modernise legacy platforms, mentor engineers and drive CI/CD, IaC and workflow orchestration (e.g., Temporal) adoption.

Design, build and operate cloud-native services, APIs and data products for customer identity resolution and master data management. Deliver scalable, secure microservices and event-driven solutions, use CI/CD and IaC, participate in design and code reviews, improve observability and reliability, modernize legacy platforms, mentor engineers, and collaborate with product, data and platform teams. Experience with workflow orchestration (Temporal) and streaming is advantageous.

Lead technical direction and architecture for institutional lending, pricing and ESG platforms. Design scalable, secure APIs and integrations, modernise legacy systems, champion AI-enabled SDLC, DevSecOps, observability and automation, mentor engineers, and collaborate with product, risk and business stakeholders to deliver resilient lending solutions.

Build high-throughput, low-latency integrations to replicate data from databases, lakes, and warehouses into ClickHouse. Debug production issues using runtime diagnostics and observability, improve system reliability and automation, write documentation, participate on-call, work with customers, and drive product and technical roadmap decisions.

Design, implement, and optimize SQA integration and test platforms and CI/CD pipelines for embedded Radio ICs/SoC software. Develop automated test scripts, maintain traceability from requirements to test results, collaborate across hardware and software teams, and deliver high-quality, documented test solutions and quality metrics.

As a Senior Software Engineer, you will build scalable distributed systems, improve developer experience, mentor peers, and lead incident responses.

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.

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.

Lead the design and development of scalable backend APIs and services focusing on IBM Cloud, providing technical leadership and collaborating with cross-functional teams.

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.

Design, build, and harden Chromium-based browser components in C++ to power Menlo's AI/agent initiatives; apply networking and HTTP security expertise; integrate AI agents and MCP servers; build tooling in Python or Rust; deploy and operate cloud infrastructure (AWS/GCP, Kubernetes, Terraform); debug and optimize performance-critical systems; collaborate cross-functionally.

Design, build, and operate Threat Protection and ShadowAI services: scalable distributed systems and APIs that detect and control risky web and generative AI usage. Own features end-to-end, maintain availability and latency SLOs, write tests, perform code reviews, use AI-assisted tools, and collaborate with cross-functional teams to improve detection accuracy and production reliability.

Build and own backend integrations connecting Voxie's SMS platform to CRMs, POS, marketing tools, and messaging providers. Design scalable, testable serverless systems on AWS, handle high-throughput messaging, implement reliable API/webhook/SFTP/batch pipelines, and collaborate with sales, partners, and customers to scope and deliver integrations.

Provide organisation-wide technical leadership as a Staff Software Engineer: shape technical strategy, design scalable distributed systems, set engineering standards, mentor senior engineers, improve reliability/observability/CI-CD, and contribute hands-on to critical cloud-native payment systems.

Lead and own platform architecture across Infrahub ecosystem, implement high-impact architectural improvements, reduce technical debt, champion AI-first engineering, provide hands-on technical leadership, mentor engineers, and collaborate with product and leadership to ensure scalable, extensible systems.

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.

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.