Descripción de la vacante
Anyone AI
US$45 - US$80 an hour
Spain
Backend Developer - AI Trainer (Spain) en Spain, España is listed on Jobeax. Browse 80,000+ vacancies available.
Anyone AI is recruiting skilled Backend Developers to work on a project with a leading AI lab.
Contributors will:
Design and implement multi-file coding tasks across bug fixing, feature development, refactoring, and testing
Write clear natural-language specifications and reference implementations
Develop and extend unit and integration test suites
Review peer-generated tasks for correctness, clarity, and realism
Identify edge cases, ambiguities, and potential failure modes
Ensure alignment between specifications, code, and expected outputs
Advanced professional written proficiency in English
3-7 years of professional software engineering experience
Strong proficiency in Python and JavaScript/TypeScript; working knowledge of Java, C#, or Go
Backend or full‑stack development experience in production systems
Experience with testing frameworks (e.g., pytest, Jest, JUnit, xUnit, Go testing)
Proven ability to debug and navigate large, multi‑file codebases
Experience with code reviews, refactoring, and production migrations
Engagement: Part-time, project-based expert evaluation work
Work Type: Remote
Contributors will design and evaluate realistic software engineering tasks, including bug resolution, feature implementation, refactoring/migration, and test generation. Work includes both creating complex coding scenarios and reviewing peer submissions for quality and accuracy.
This is a project-based consultant role. Consultants will be paid on a per-project basis; hourly rates are estimates based on anticipated completion time. Consultants control their own schedule, provide their own tools, and may simultaneously provide services to other vendors/employers (subject to those vendors' allowances).
High-quality, production-realistic coding tasks
Complete and correct reference implementations
Robust test coverage and validation artifacts
Structured, actionable peer review feedback
Vacantes similares
US$45 - US$80 an hour
About the job Anyone AI is recruiting skilled Backend Developers to work on a project with a leading AI lab. Qualifications - Advanced professional written proficiency in English - 3-7 years of professional software engineering experience - Strong proficiency in Python and JavaScript/TypeScript; working knowledge of Java, ...
Spain
US$113,750 a year
... high‑speed internet; company‑sponsored benefits such as health insurance and PTO do not apply. How you'll work Job title: Mathematics Specialist (Fluent in Spanish - Spain) - AI Trainer Employment type: Contract Workplace type: Remote Seniority level: Mid‑Senior Level Hiring process Ready to turn your mathematics expertise into ...
Spain
US$113,750 a year
... high‑speed internet; company‑sponsored benefits such as health insurance and PTO do not apply. How you'll work Job title: Coding Specialist (Fluent in Spanish - Spain) - AI Trainer Employment type: Contract Workplace type: Remote Seniority level: Mid‑Senior Level - US$113,750 a year Gross, as stated in the ad. - Freelance ...
Spain
Up to US$13 an hour
... English proficiency. Mindrift connects specialists with project-based AI opportunities for leading tech companies, focused on testing, evaluating, and improving AI systems. Participation is project-based, not permanent employment. What this opportunity involves Annotation is what helps AI make sense of the world. As an annotator, ...
Spain
Up to US$13 an hour
What you'll get Paid per accepted task. Your rate depends on the qualification tier you reach and how efficiently you complete tasks - up to the equivalent of $13/hr . Because payment is per task, a faster pace raises your effective hourly rate. Keep in mind, quality standards must be maintained, regardless of speed. Job ...
Spain
Up to US$13 an hour
... English proficiency. Mindrift connects specialists with project-based AI opportunities for leading tech companies, focused on testing, evaluating, and improving AI systems. Participation is project-based, not permanent employment. What this opportunity involves Annotation is what helps AI make sense of the world. As an annotator, ...
Spain
Up to US$13 an hour
What you'll get Paid per accepted task. Your rate depends on the qualification tier you reach and how efficiently you complete tasks - up to the equivalent of $13/hr . Because payment is per task, a faster pace raises your effective hourly rate. Keep in mind, quality standards must be maintained, regardless of speed. Job ...
Spain
Full-time hours
... , code reviews, pull requests, and development with IntelliJ IDEA . - Experience writing unit and integration tests using JUnit and Mockito . - Ability to explain and justify technical decisions, balancing architecture, usability, maintainability, and delivery speed . - Comfortable working independently with shared code ...
Spain
Hybrid
About the role Backend Java Developer - Senior - EY GDS Spain - Hybrid This position provides the opportunity to work in an international environment and collaborate with leading fi nancial institutions across Europe and globally. You will be part of high-performing teams delivering innovative digital transformation solutions ...
Spain
Up to US$90 an hour
... paid Additional information Please submit your CV in English and indicate your level of English proficiency. Mindrift connects specialists with project-based AI opportunities for leading tech companies, focused on testing, evaluating, and improving AI systems. Participation is project-based, not permanent employment. - ...
Spain
... para abordar los mayores retos del planeta, desde la sostenibilidad hasta la eficiencia en infraestructura. Nuestro Grupo de Soluciones Inteligentes (ISG) en Kaiserslautern está a la vanguardia de la tecnología, enfocándose en la investigación y el desarrollo de tendencias para máquinas móviles de alto rendimiento. Misión ...
Spain, Cai
... para abordar los mayores retos del planeta, desde la sostenibilidad hasta la eficiencia en infraestructura. Nuestro Grupo de Soluciones Inteligentes (ISG) en Kaiserslautern está a la vanguardia de la tecnología, enfocándose en la investigación y el desarrollo de tendencias para máquinas móviles de alto rendimiento. Misión ...
Spain, Zaragosa
jobtraffic
42000 €/año
¿Te interesaría seguir desarrollándote como Software Developer en una empresa internacional líder en la gestión de almacenes, automatización y optimización del flujo de materiales? Desde Oxigent Technologies seleccionamos un/a Backend Developer para unirte a un equipo internacional de IT y participar en el desarrollo, implementación ...
Spain, Barcelona
... para abordar los mayores retos del planeta, desde la sostenibilidad hasta la eficiencia en infraestructura. Nuestro Grupo de Soluciones Inteligentes (ISG) en Kaiserslautern está a la vanguardia de la tecnología, enfocándose en la investigación y el desarrollo de tendencias para máquinas móviles de alto rendimiento. Misión ...
Spain, Alava
Tinybird
€68,000 - €96,000 a year
... maintain. - We work closely with platform, support, customer success, and other engineering teams because our work sits at the intersection of user experience, backend systems, and data. - We have few mandatory meetings, under 2h/week. We know that deep work requires focus. - Check out our blog or follow us on LinkedIn to ...
Spain
Qaracter - Beyond your Challenge
... quality assurance. As the Technical Lead, you will remain accountable for ensuring that AI-assisted outputs are technically sound, secure, tested, traceable, maintainable, and production-ready. What You'll Do - Lead and supervise the end-to-end technical delivery of secure, scalable, and maintainable Backend/API capabilities. ...
Spain, Castro
Idealista
... San Valentín, Navidad,…¡Te lo vas a pasar muy bien! - Teambuilding y mucho más! ¿Qué esperamos de ti? - Tienes al menos 3 años de experiencia desarrollando el backend de alguna aplicación utilizando Java, y nos puedes hablar de ello. - Ver el correo electrónico en https://jobeax.com/link/8om4ubga9gvjbUNE trabajamos principalmente ...
Spain
Found By Few
90000 €/año
Role: Senior Backend Developer Salary: Up to €90,000 Industry: B2C HealthTech Location: Remote Europe (Spain, Portugal, Germany or the UK) Why join? This is a chance to build at real scale on an app that millions of people use every day. You'll be working on the backend systems that keep everything running smoothly. The ...
Spain, Vitoria
Capitole
€1200 EUR
Capitole sigue creciendo y queremos hacerlo contigo ! Buscamos un/a Backend Developer con experiencia en entornos IoT y arquitecturas cloud para incorporarse a un entorno tecnológico internacional dentro del ecosistema M2M de un cliente líder en el sector de la seguridad. Trabajarás con una visión end-to-end del servicio, ...
Spain