Top Software Engineer Jobs in Spain

The Software Engineer will develop and enhance data collection and ingestion pipelines to support AI model training, focusing on cloud infrastructure and data processing.

Develop and maintain full-stack financial applications using agile practices. Deliver new features, address technical debt, ensure code quality and security, participate in architecture and code reviews, improve performance, and mentor junior engineers while collaborating with stakeholders.

Lead technical delivery of Asset Management programs and PoCs: design, develop, and deploy scalable solutions using Generative AI, LLMs, RAG, APIs (REST/GraphQL), data ingestion and databases (Postgres, MongoDB, Cosmos DB). Evaluate AI architectures and tools (MCP, AI-assisted coding), manage vendors and distributed teams, support DevOps and release processes, and drive digital twin, IoT, and advanced analytics pilots into production.

Design, develop, and deliver scalable B2B platform features and services using Java/JVM technologies. Build RESTful APIs and microservices, work with cloud and DevOps tooling, troubleshoot production issues, participate in architecture and code reviews, and collaborate with cross-functional teams.

Design and scale mission-critical market data services for stocks, options, crypto, and foreign exchange. Responsibilities include architecting backend systems and APIs, maintaining software quality and test coverage, participating in code reviews, and troubleshooting incidents and bugs. The role uses Go and Python with REST, gRPC, WebSockets, SSE, Docker, Kubernetes, Google Cloud, BigTable, Prometheus, Grafana, and ELK.

The Software Engineer will design, develop, and maintain backend APIs, oversee API performance, and collaborate with cross-functional teams while focusing on user experience and scalability.

The Software Engineer will focus on data collection and infrastructure for AI model training, collaborating with scientists to enhance data acquisition processes.

The Software Engineer will design, develop, and maintain backend APIs, collaborate on B2B solutions, and align architecture with product strategy.

This role involves finding audio data sources, operating cloud infrastructure on GCP, and collaborating with scientists for data models.

As a Senior iOS Engineer at Speechify, you will lead engineering and product decisions, develop the iOS app, participate in product strategy, and enhance the app's architecture.

The Full Stack Software Engineer will design, develop, and maintain frontend and backend components, collaborating across teams to deliver scalable solutions for Taptap's technology platform.

The Full Stack Software Engineer will design, develop, and maintain frontend and backend components for Taptap's global technology platform, collaborating with cross-functional teams to deliver scalable solutions.

Design, build, and optimize backend services for data gathering, processing, and delivery. Define and maintain service contracts, ensure high test coverage, observability, and documentation. Make architectural decisions for distributed systems, collaborate with product teams, and maintain/ improve an existing Kotlin/Java codebase.

Lead backend development of Diabolocom's Voice Squad, building and optimizing core telephony services (call routing, media handling). Design and implement distributed systems, refactor for scalability and faster delivery, work across Java/Kotlin/Go, Spring Boot, PostgreSQL, RabbitMQ, Redis, Docker. Mentor teammates, own architectural decisions, improve existing codebase, and drive high-performance, reliable voice platform.

Build and maintain API integrations and the connectivity platform linking EV chargers, vehicles, and OEMs. Improve reliability, observability, and scalability; develop automations and internal tools for monitoring and triage; define SLAs and alerting; collaborate with product and engineering teams to balance stability and delivery.

Seeking a Software Development Engineer in Test (SDET) to design and implement automated testing frameworks ensuring application reliability and performance, working closely with developers and product teams.

Design and implement robust Rust services and libraries for trading, payments, and crypto consumer experiences. Build scalable, low-latency distributed systems, write efficient testable code, ensure security and reliability, debug across the stack, collaborate with product teams, own systems end-to-end, and mentor other engineers.

Lead architecture and backend development for international core systems, ensuring high availability, concurrency, security, and scalability. Design Java/Spring Boot services, optimize performance, integrate MySQL/Redis/Kafka, manage technical risk, drive productization, mentor engineers, and coordinate with suppliers and product teams. Onsite role in London supporting European operations.

The Senior Software Engineer will develop software solutions, mentor juniors, collaborate on projects, and integrate GenAI features within a team environment focused on cancer research.

The Staff Software Engineer will own technical vision across teams, contribute hands-on, and lead initiatives to enhance the platform's reliability and capability, collaborating across functions.

Develop, maintain, and optimize .NET-based integration solutions connecting business applications. Implement secure RESTful and SOAP APIs and microservices, work with SQL/NoSQL databases and message brokers, ensure compliance and performance, troubleshoot integrations, and collaborate with IT and business teams in an Agile squad.

Design and implement cloud-native microservices for the Miles Enterprise platform. Translate domain models into service architectures, build RESTful APIs, design databases and ORMs, apply CI/CD and containerization, prioritize security in SSDLC, collaborate with API consumers, and mentor junior engineers.

Full‑stack engineer responsible for building and owning elastic.co features end-to-end: React front‑end, backend services, CI/CD, production instrumentation, security triage, on‑call incident response, and collaborating with product and design to deliver scalable, secure web experiences.

Lead design and development of low-level Linux instrumentation and eBPF-based runtime security features for detection, monitoring, and workload protection. Drive architecture, implement performance-sensitive systems, establish testing methodologies, deliver end-to-end features, and provide technical leadership and cross-team collaboration across Datadog's security products.

Lead and deliver backend features for Repayment Scheduling: design and implement highly available distributed systems, collaborate with product/design/analytics, own operational reliability and on-call duties, mentor engineers, set quality standards, and drive technical decisions and delivery.