Top Software Engineer Jobs in Spain

Lead design and delivery of scalable web and backend systems for CommSec. Drive architecture, mentor engineers, collaborate with product/design/ops, champion best practices, and ensure reliability, security, and performance across TypeScript/React frontends and C#/.NET Core APIs backed by MSSQL or similar databases.

Responsible for building scalable distributed systems, mentoring teammates, innovating on technical solutions, and improving team processes. Requires expertise in backend languages, especially Golang and Typescript.

The Lead Software Engineer will design and build full-stack applications, mentor engineers, ensure performance and security, and lead initiatives to optimize development workflows. They will collaborate with cross-functional teams to align technical direction with business goals and oversee adherence to engineering best practices.

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

The Principal Software Engineer will design scalable backend services, implement AI integration, mentor peers, and enhance team workflows within an Agile environment.

Support community-driven development by reviewing community PRs, improving contribution processes, debugging issues, and enhancing documentation. Collaborate with contributors and maintainers for reliable product improvements.

Design, build, and maintain high-performance services for Database & Streaming provisioning systems, collaborating with teams to enhance automation and developer experience.

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

As a Lead Software Engineer, you'll design and maintain backend services, scale systems, and collaborate on innovative architectural solutions in an agile environment, focusing on observability tools.

Lead design and implementation of an automation platform to orchestrate package creation, test generation, and image builds. Build LLM-integrated tooling, write production Go for CLIs and services, develop test generators and validation frameworks, and drive roadmap and engineering quality across a small team.

As a Senior Software Engineer at Rewardful, you'll improve infrastructure, optimize performance, implement scalable solutions, and develop new features for our SaaS affiliate management platform.

The Senior Software Engineer will build API interfaces, backend infrastructure, and Ruby on Rails applications, collaborate with teams, and improve existing systems.

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.

Senior Software Engineer to design and implement C++/Python software, accelerate workloads with CUDA, develop and maintain Linux kernel modules and system services, optimize system and GPU performance, manage Linux systems, mentor junior engineers, and integrate AI technologies across products.

Lead design and improvements for Elasticsearch distributed systems, focusing on scalable, performant, and resilient indexing, cluster coordination, replication, and debugging of concurrency and performance issues. Own projects end-to-end and support cross-team engineering and support staff.

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.

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

As a Staff Unity Client Engineer, you will own game features and collaborate across teams for high-quality game client development, focusing on full lifecycle responsibilities.

Join Filigran as a Senior Software Engineer to develop a scalable XTM Suite platform using TypeScript and Python. You'll focus on architecture and community engagement while innovating cybersecurity solutions.

The role involves improving Firefox development workflows, mentoring team members, collaborating across teams, and analyzing development data.

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.

The Senior Software Engineer will collaborate on projects, optimize functionality, build cloud functions, and enhance APIs to improve user experience at Speechify.

As a Senior Software Engineer, you will collaborate with product teams to optimize systems, design APIs, and ship cloud functions using Kotlin.

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