Top Software Engineer Jobs in Spain

Join Reedsy to develop and improve a collaborative word processor, adding features and ensuring performance and security for users.

The Senior Software Engineer will develop core business products, ensuring performance and scalability, and automate development processes while collaborating with stakeholders.

Develop and optimise the FX multi-currency accounting platform; design new services via RFCs; lead initiatives from discovery to delivery; mentor engineers; ensure testable code with unit and integration tests; contribute to CI Jenkins pipelines and Terraform deployments; integrate monitoring/alerting and external systems; participate in occasional on-call rotation.

Develop and improve the FX multi-currency accounting platform, design services via RFCs, mentor engineers, lead product initiatives, own service lifecycle, maintain legacy code, implement APIs, monitoring and alerting, ensure test coverage and CI/CD, and participate in occasional on-call rotation.

Lead architecture and technical direction for enterprise SaaS microservices. Contribute hands-on to critical code, design scalable distributed systems, ensure reliability and security, mentor engineers, and collaborate cross-functionally to align technical solutions with business goals.

Define and document embedded real-time software requirements, create and execute verification test cases, maintain traceability, manage defect reports, and collaborate with system/product teams to deliver certified, high-quality airborne software products.

Design and implement core Web3 protocol features and secure smart contracts in Solidity. Integrate blockchain solutions with cross-functional teams, ensure scalability and performance, stay current on EVM internals, conduct code reviews, and mentor junior engineers.

Design and implement a video processing engine, develop a cross-platform rendering engine, integrate systems, and optimize performance while collaborating with other engineers.

As the AI Agents Solutions Architect at Kraken, you'll design and build an AI-native finance operating system, automating finance operations and ensuring compliance in a regulated environment.

Design and implement real-time telemetry pipelines and fault-tolerant integration layers between IT and OT systems for datacenter power and grid-aware workload control. Own architecture and delivery of safe, reliable control systems from edge to control plane.

As a Mid-Senior Software Engineer at Smadex, you will design and implement features, ensure code quality, and maintain system performance in a collaborative environment.

Build and maintain scalable landing experience apps and services using modern web stacks. Design and implement high-quality solutions, drive technical design, troubleshoot performance and stability issues, mentor junior engineers, collaborate with product and design, improve development processes, and maintain documentation. Participate in on-call rotations and hybrid office collaboration.

Maintain and evolve Node.js/TypeScript serverless backend services on AWS for a mobile news app. Support content ingestion, APIs, WebView rendering, reliability, observability, testing, and Terraform-managed infrastructure while debugging production issues and documenting operational knowledge.

Maintain and evolve Node.js/TypeScript serverless backend on AWS Lambda powering a mobile news app. Support content ingestion, APIs, WebView rendering, reliability, observability, testing, Terraform-managed infra, and production incident investigation.

Maintain and optimise CI/CD systems, shape CI/CD strategy, improve security and compliance, implement pipeline security checks, standardise pipelines, mentor engineers, contribute to roadmap prioritisation, and manage incidents and production deployment stability.

Design and implement frontend and native C/C++ libraries for 3D smart cameras, develop embedded ARM software, contribute to a common platform and 3D visualization library, and participate in team planning, design reviews, and cross-site collaboration.

Lead architecture and backend development for the vCluster platform by designing and implementing Kubernetes-native solutions in Go, owning features end-to-end, contributing to open-source, and solving deep systems challenges around multi-tenancy, isolation, and GPU infrastructure.

Lead rapid prototyping, architectural research, and complex technical projects for a Kubernetes virtualization platform. Partner with the CTO to shape product direction, integrate new technologies, and occasionally engage customers to translate needs into engineering solutions. Provide technical leadership beyond coding and mentor the team.

Architect and build core backend components of the vCluster platform by working deeply with Kubernetes internals. Write high-performance Go code, take end-to-end ownership from design to release, contribute to open-source projects, and solve complex systems and multi-tenancy problems for GPU and Kubernetes-based infrastructure.

Lead and be hands-on in architecture and shipping code to scale AI-powered mobile apps from 0->1 and 1->100. Own complex technical challenges, improve performance and reliability for millions of users, migrate critical infrastructure, raise engineering standards, and collaborate cross-functionally with product and design.

The role involves developing and maintaining COBOL applications, collaborating with teams, troubleshooting issues, and engaging in continuous learning.

As a Principal Forward Deployed Engineer, you'll deploy JetBrains Central in enterprise environments, implement AI governance, mentor teams, and advise customers on AI-native development best practices.

Develop core backend components for a blockchain network, focusing on reliability and scalability, mainly using Rust. Ensure code quality through testing and debugging.

The Senior Full-stack Engineer will design and build features in TypeScript, driving projects with a product mindset and collaborating in a dynamic startup environment.

The Staff Software Engineer will lead technical direction, improving system design and mentoring others while writing code and collaborating across teams for a cloud-based generative coding platform.