Top Software Engineer Jobs in Spain

You will set technical strategy, collaborate across teams, ensure operations, maintain high code quality, and develop talent on your team.

The Senior Software Engineer II will build and maintain a payment platform, ensuring high quality code and collaborating across teams to enhance product functionality and performance.

As a Software Engineer at Prosper AI, you'll design and scale AI voice agent systems for healthcare, focusing on low-latency speech and reliability systems.

The Software Engineer will develop features across front-end and back-end, write scalable code, and troubleshoot software while collaborating closely with Product and Engineering teams.

Lead system/software engineering teams in designing, developing, and integrating software solutions for hybrid cloud automation and manage customer engagements.

Join Mews as a Software Engineer in the Connectivity team to design, implement, and maintain backend services and public APIs, ensuring high reliability and performance while collaborating with partners and other teams.

As a Software Engineer, you will help train large-language models in code evaluation and training, focusing on Ruby, with an emphasis on code review and improvement.

Train large-language models to improve code quality by comparing snippets, providing feedback, and refining AI-generated code. Requires strong communication skills and attention to detail.

Responsible for training large-language models by reviewing, ranking, and improving AI-generated code. Requires strong software engineering skills.

As a Junior Software Engineer, you will join the backend team, focusing on code quality, participating in team planning, and developing production-grade Python code. You'll learn Fever's tech stack and contribute to system development and improvements, while mentoring peers after your initial months.

As a Senior Mobile Software Engineer, you'll design, develop, and maintain mobile applications, primarily focusing on the Android platform, and mentor team members while ensuring high code quality and collaboration within interdisciplinary teams.

The Staff/Lead Engineer role involves maintaining and enhancing video generation infrastructure, building monitoring tools, and ensuring scalable solutions while evaluating commercial impacts and guiding team direction.

Design and implement core distributed systems at scale, solve performance and scalability issues, build horizontally scalable and event-driven components, collaborate cross-team, and participate in on-call rotation to address urgent incidents.

Build and ship production-grade full-stack features: translate product needs into scalable systems, own end-to-end delivery (requirements, implementation, QA, deployment, monitoring), challenge assumptions, and prioritize high-impact engineering solutions.

Design, build, and maintain backend services for mobile tracking SDKs. Define efficient REST APIs with mobile-focused optimizations, ensure high-throughput low-latency processing, collaborate with mobile and tracking teams, own monitoring/alerting and performance profiling, and maintain high code and test quality.

Design and implement ML platform capabilities: observability, cost and training efficiency, experimentation tooling, and SaaS-grade ML services in Python. Collaborate with Staff Engineer and SRE/DevXP to deliver production-ready, scalable, and developer-friendly infrastructure for data scientists.

Build and maintain the Mews POS Android app using Kotlin and modern Android practices. Own end-to-end feature development, ensure performance, reliability, security, and observability, collaborate with product and design, ship frequently in an agile environment, and contribute to long-term technical health.

Build and maintain backend-first features and integrations for Triptease's marketing channels. Work across the full stack (primarily backend), design scalable distributed systems, implement CI/CD on cloud platforms, collaborate closely with product teams, pair program, write tests (TDD), and contribute to squad strategy and product quality.

Implement and administer CPQ solutions, configure pricing and discounting models, integrate CPQ with CRM (Salesforce/Microsoft Dynamics) and ERP systems, automate sales processes, and support CPQ platform implementations and optimizations.

Own availability and performance of mission-critical services, improve scalability and observability, build platform tooling, practice sustainable incident response, participate in on-call rotation, collaborate with product teams, and follow FinOps best practices.

Train LLMs to produce production-grade code by comparing and ranking snippets, repairing and refactoring AI-generated code, and injecting reviewer feedback into the RLHF pipeline. Provide clear written justifications and spot logic, performance, and security issues while working remotely as a 1099 contractor.

Review, rank, and improve AI-generated code across languages, focusing on Ruby. Repair/refactor code, provide detailed written justifications, and inject ratings/edits/test results into the RLHF pipeline to help train models.

Evaluate and improve AI-generated code: compare and rank snippets, repair and refactor for correctness, efficiency, and style, and inject detailed feedback and test results into the RLHF training pipeline as an asynchronous remote contributor.

Review, rank, and improve AI-generated code to train LLMs: compare implementations, repair/refactor for correctness, efficiency, and style, and provide detailed feedback for RLHF pipelines. Work asynchronously as a remote contractor, injecting ratings, edits, and test results to improve model outputs.

Review, rank, repair, and refactor AI-generated code to improve correctness, performance, and style. Provide detailed written feedback and edits for RLHF pipelines, converting expert judgments into signals used to train models. Work asynchronously as a remote 1099 contractor.