Hello, I’m Stephen Smith. I’m a results-driven full-stack developer and AI-native RLHF evaluator with 4+ years of software engineering experience and a focus on high-accuracy AI training data creation. I specialize in code generation review, CoT tracing verification, SWE-bench style evaluations, function calling annotation, and preference ranking, with a proven ability to analyze complex coding problems, document failure modes, and provide actionable feedback to improve large language models. I thrive in collaborative Agile environments and am comfortable working remotely with global teams to deliver secure, scalable solutions across the full stack from UI to backend, while continuously refining data pipelines and training datasets for robust AI systems.

Stephen Smith

Hello, I’m Stephen Smith. I’m a results-driven full-stack developer and AI-native RLHF evaluator with 4+ years of software engineering experience and a focus on high-accuracy AI training data creation. I specialize in code generation review, CoT tracing verification, SWE-bench style evaluations, function calling annotation, and preference ranking, with a proven ability to analyze complex coding problems, document failure modes, and provide actionable feedback to improve large language models. I thrive in collaborative Agile environments and am comfortable working remotely with global teams to deliver secure, scalable solutions across the full stack from UI to backend, while continuously refining data pipelines and training datasets for robust AI systems.

Available to hire

Hello, I’m Stephen Smith. I’m a results-driven full-stack developer and AI-native RLHF evaluator with 4+ years of software engineering experience and a focus on high-accuracy AI training data creation. I specialize in code generation review, CoT tracing verification, SWE-bench style evaluations, function calling annotation, and preference ranking, with a proven ability to analyze complex coding problems, document failure modes, and provide actionable feedback to improve large language models.

I thrive in collaborative Agile environments and am comfortable working remotely with global teams to deliver secure, scalable solutions across the full stack from UI to backend, while continuously refining data pipelines and training datasets for robust AI systems.

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Experience Level

Expert
Expert
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Language

English
Fluent

Work Experience

Full-Stack Developer at Nexlify Solutions
June 1, 2024 - November 1, 2025
Owned the full development lifecycle for internal tools and client-facing SaaS prototypes, emphasizing integrity, API validation, cross-functional compatibility, and production-grade quality. Designed modern React.js + Tailwind CSS user interfaces with intuitive flows, accessibility (WCAG), responsiveness, and performance. Developed secure Node.js/Express backends with MongoDB, incorporating real-time features, optimized queries, indexing strategies, and robust error handling. Collaborated in a small Agile team to rapidly prototype features while maintaining high code quality, documentation, and reliability. Contributed to early-stage product development by identifying edge cases, performing security reviews, and optimizing performance — skills critical for red-teaming, reasoning step verification, and RLHF data creation.
Freelance Full-Stack Developer at Arc.Dev / Independent Client Projects
June 1, 2023 - March 1, 2024
Built and maintained full-stack SaaS prototypes and custom software for small-to-medium U.S. businesses (booking systems, content management tools, real-time features). Conducted internal code audits, reasoning verification, and quality assurance within Agile teams. Handled UI/UX wireframes in Figma, frontend implementation (React.js, HTML5/CSS3/JavaScript), backend logic (Node.js/Python), database design, and deployment pipelines. Ensured cross-browser compatibility, security hardening, and data integrity across concurrent projects. Focused on iterative development with precise requirements gathering, resulting in robust, maintainable codebases suitable for supervised fine-tuning datasets.
Freelance Full-Stack Developer at Toptal
April 1, 2022 - March 1, 2023
Engineered scalable enterprise-grade solutions; conducted in-depth security reviews, code refactoring, and performance tuning for high-profile U.S. clients. Led frontend development with React.js and TypeScript, delivering pixel-perfect, accessible, and responsive UIs. Designed and implemented robust Node.js/Express backends with MongoDB/PostgreSQL, cloud deployments (AWS EC2, S3), and third-party API integrations. Improved overall code quality and efficiency through systematic debugging, optimization strategies, and comprehensive testing.
Freelance Full-Stack Developer at Upwork
February 1, 2021 - February 1, 2022
Led the development of 15+ custom full-stack applications for U.S. clients using React.js, Node.js/Python, MongoDB/PostgreSQL, and MySQL. Performed rigorous code reviews, bug detection, refactoring, and reasoning verification to ensure high code quality. Built secure RESTful APIs with JWT/OAuth and third-party integrations, with strong input/output validation. Collaborated closely with clients in Agile sprints to gather requirements and deliver production-ready solutions with minimal defects. Implemented systematic debugging, caching, database query optimization, and performance profiling to improve scalability.

Education

Associate Degree in Computer Science at Ocean County College
January 11, 2030 - January 1, 2025

Qualifications

AI-Native Specialist: RLHF Evaluator
May 1, 2026 - July 6, 2026
AI-Native Foundations
May 1, 2026 - July 6, 2026

Industry Experience

Software & Internet, Professional Services

Experience Level

Expert
Expert
Expert
Expert
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Expert
Expert
Expert
Expert
Expert
Expert
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Expert
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