Backend Java Developer

Job Title: Backend Java Developer Job Type: Contractor Location: Remote About the hiring company: Our client is a rapidly growing, venture-backed AI company helping shape the next generation of intelligent systems. By combining world-class human expertise with advanced machine learning workflows, they enable leading AI organizations to build, evaluate, and improve cutting-edge models used across a wide range of industries. The company works with highly accomplished professionals in fields such as software engineering, finance, healthcare, legal, operations, research, and other specialized domains. These experts contribute directly to the development of advanced AI systems by providing real-world knowledge, evaluations, feedback, and domain-specific judgment that help models reason more accurately and perform more effectively. Leveraging a proprietary AI-driven talent assessment and matching platform, the organization identifies exceptional professionals globally and connects them with high-impact projects at the forefront of artificial intelligence. Backed by more than $40 million in funding and supported by a rapidly expanding international network of experts, the company is building critical human intelligence infrastructure for the AI economy and creating meaningful opportunities for professionals to apply their expertise in entirely new ways. Job Summary: As a Backend Java Developer, you'll apply your expertise to help train next-generation AI systems. Your work will shape how models learn, reason, and perform through high-quality, real-world input. No prior experience in AI is required — your domain knowledge is what matters. Key Responsibilities Design, develop, and maintain scalable backend systems using Java and Spring Boot. Architect robust microservices solutions to support complex application requirements. Collaborate with the customer's team to review technical specifications and deliver high-quality code. Contribute expert insights to improve application performance, reliability, and security. Participate in code reviews and provide constructive feedback to peers. Document technical processes and solutions with clear, concise written communication. Troubleshoot, debug, and optimize backend systems as needed. Required Skills and Qualifications Expert proficiency in Java programming language. Hands-on experience with Spring Boot framework for backend development. Strong knowledge of microservices architecture and design principles. Demonstrated ability to write clean, maintainable, and efficient code. Exceptional written and verbal communication skills, with a keen attention to detail. Experience collaborating with remote teams in a fast-paced environment. Solid understanding of REST APIs, data structures, and backend best practices. Preferred Qualifications Exposure to cloud platforms such as AWS, Azure, or Google Cloud. Prior experience working on AI-driven or data-intensive projects. Background in high-availability or distributed systems. A very attractive and competitive package is offered.