Full Stack Engineer

We are working with an innovative company that's at the forefront of AI development, providing human feedback to improve the AI agents of the world's most cutting-edge organizations. They are passionate about shaping the future of autonomous systems and training Large Language Models (LLMs) to function as proactive, multi-step agents, focusing on designing, coordinating, and optimizing complex, real-world architectural workflows.The Role Develop objective, verifiable criteria to evaluate system performance and ensure outputs meet strict functional requirements. Review system logs and 'trajectories' to refactor code, improve execution paths, and achieve optimal reliability. Test systems for vulnerabilities, including improper data exposure, unauthorized access escalations, and edge-case failures. Help train generative AI models and contribute to the advancement of advanced generative systems.What You'll Need 2+ years of experience in backend engineering, AI automation, or complex systems integration. Proven ability to build and maintain production-grade software with modular separation. Strong command of at least two major languages (e.g., Python, JavaScript, Go, or Java) and experience with SQL databases. Practical experience building for live, non-mocked environments and handling multi-turn system interactions. Outstanding attention to detail and the ability to provide clear, high-density technical feedback on complex system behaviors. Experience identifying subtle failures like privacy leaks, authority escalation, or indirect prompt injections.What's On Offer Opportunity to shape the future of autonomous agents and advanced generative systems. Fully remote freelance role with flexible hours. Competitive hourly rates for core project work. Additional incentives and opportunities to boost earnings.Apply via Haystack today!