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Arun KumarAK
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Arun Kumar

@arunkumar47

AI/ML engineer at Mercor who built LLM evaluation and human-feedback tools, RAG pipelines, and production AI services.

United States
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At Mercor, I developed AI-powered applications and internal tools for LLM evaluation and human-feedback workflows. I built orchestration and annotation services, integrated OpenAI and Anthropic Claude, and designed RAG pipelines with LangChain and semantic search.

At DataAnnotation, I developed platforms for SFT and RLHF data pipelines, along with tools for response ranking, hallucination detection, and model evaluation. Earlier, I built a cryptocurrency web application at Zerion and delivered web applications and e-commerce solutions at DGN Technologies.

Experience

Work history, roles, and key accomplishments

ZE

Software Engineer

Zerion

Jan 2019 - Dec 2022 (3 years 11 months)

Built and maintained a cryptocurrency web application using React and Web3.js with Ethereum smart-contract integrations. Designed REST APIs with Express, real-time WebSocket updates, and AWS-hosted application infrastructure.

DT

Web Developer

DGN Technologies

Oct 2014 - Dec 2018 (4 years 2 months)

Delivered 30+ responsive web applications and websites using PHP, Laravel, WordPress, and Magento. Created custom e-commerce solutions that increased online sales by 60%.

Education

Degrees, certifications, and relevant coursework

University of California, San Diego logoUD

University of California, San Diego

Bachelor's degree, Computer Engineering

2010 - 2014

Bachelor's degree in Computer Engineering from the University of California, San Diego, completed in 2014.

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