Top Software Engineer Jobs in Spain

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.

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.

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.

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.

As a Staff Platform Engineer at Joko, you will lead platform efforts, ensure infrastructure reliability, enhance developer experience, and optimize costs, focusing on security and scalability while collaborating across teams.

Develop backend services, APIs and modern frontends; implement event‑driven architectures and cloud deployments; integrate AI/LLM-driven agents, maintain CI/CD pipelines, automated testing, and production monitoring to support customer care applications.

The Software Developer will lead a team for developing high-quality, bug-free security technology solutions, focusing on architecture, API integration, and compliance with best practices, while collaborating with internal and external stakeholders.

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

As a Backend Engineer at Fever, you'll develop production-grade Java applications, implement RESTful APIs, and enhance the platform based on user needs.

Senior engineer owning feature lifecycle: design, architecture, implementation, reliability, and cross-team impact. Lead architecture, SRE/observability, security practices, mentor engineers, and drive product-technical alignment using AI-augmented workflows.

Develop high-performance real-time embedded software for ARM Cortex-M systems, including device drivers, APIs, SDKs, hardware abstraction layers, testing tools, and documentation. Collaborate with cross-functional engineering teams, perform code reviews, analyze test results, support customers during beta and post-release phases, follow software quality and licensing practices, and mentor junior engineers.

Develop and maintain multi-platform motion control and communication libraries and GUIs for servo drivers. Implement advanced identification and tuning algorithms, optimize performance, produce internal architecture and design documentation, define test plans with QA, and collaborate closely with firmware teams to deliver robust motion control products.

Design, build, and operate reliable, scalable backend services, APIs, and platform components. Lead complex feature development from planning through release, improve service performance, monitoring, alerting, observability, and operational readiness, and collaborate with engineering, product, and QA teams. Serve as a technical contributor for debugging and architecture decisions while mentoring junior engineers and advancing engineering standards.

Develop and enhance MAAS core components, improve architecture, collaborate across teams, and ensure high standards in documentation and CI practices.

Lead development of vector similarity search capabilities in Elasticsearch, including designing algorithms and data structures, implementing modern Java features, improving search relevance and performance, fixing bugs, and collaborating with a globally distributed engineering and open-source community. Own technical initiatives from design through delivery, guide cross-functional projects, and serve as an expert on Elasticsearch vector search.

Lead development of Elasticsearch vector search capabilities, including designing and implementing new features, algorithms, and data structures; improving search relevance, speed, and scalability; fixing complex bugs; and contributing to Apache Lucene. Collaborate with a globally distributed engineering and open-source community, provide technical leadership, review code, and guide cross-functional initiatives. Develop modern Java software and independently drive projects from technical design through delivery.

Lead Elasticsearch search relevance and vector search initiatives, designing and implementing new search features, algorithms, and data structures in modern Java. Improve performance, scalability, and relevance; resolve complex bugs; collaborate with a globally distributed engineering and open-source community; review code, guide technical decisions, and own projects from design through delivery.

Lead Elasticsearch search relevance initiatives, designing and implementing search features, algorithms, and data structures while resolving complex bugs. Improve vector search capabilities, performance, scalability, and code quality using modern Java. Collaborate autonomously with globally distributed engineers and open-source contributors through design, code review, issue triage, and cross-functional initiatives.

Lead technical direction and hands-on execution for major products and systems. Design scalable backend, frontend, API, database, and cloud solutions; write and review code; make architecture trade-offs; resolve production issues; improve testing, security, observability, and engineering practices; lead critical initiatives and mentor engineers across distributed international teams.

Lead technical direction and hands-on execution for major software products and systems. Design scalable backend, frontend, API, database, and infrastructure solutions; write code; make architecture trade-offs; resolve production issues; improve engineering quality; lead critical initiatives; and mentor engineers across distributed international teams.

Owns technical direction and execution for major products and systems. Designs scalable, reliable architectures across backend, frontend, APIs, databases, and infrastructure; writes code; leads architecture decisions; resolves complex production issues; improves engineering quality; drives critical initiatives; and mentors engineers across teams.

Develop, optimize, and maintain scientific analysis tools for ground and flight test data; translate mathematical models into efficient software; drive migration to the TSASM time-series platform; provide technical support and act as liaison between Ground Station Team and Spanish Analysis Community; collaborate with specialist test analysis groups across avionics, performance, handling qualities, powerplant and more.

As a Senior Engineer, you'll develop scalable, event-driven backend architectures, design low-latency APIs, and contribute to product development across the stack while optimizing performance and collaborating on AI features.

Design, implement, and maintain embedded real-time firmware for robotics platforms; own firmware lifecycle from architecture through validation and maintenance; diagnose system-level issues using hardware debugging tools; collaborate with electrical, controls, and software teams; advise leadership on firmware strategy and technical direction.