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Hercules S.

@Herculesz

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5.0
24

7.9

7.9

100%

Principal AI Engineer & Full Stack Engineer

$80 USD / Hour

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United States (8:35 PM)

Joined on December 11, 2015

9 Recommendations

$80 USD / Hour

Principal / Head AI Engineer with 25+ years of experience architecting and scaling complex software systems, now specializing in Large Language Models (LLMs), agentic workflows, and AI-first product development. Proven expertise in integrating OpenAI APIs, building RAG pipelines, and deploying scalable, production-grade LLM features using LangChain, pgvector, Pinecone, and related technologies. Hands-on leader with a track record of transforming business workflows through intelligent systems—semantic search, AI copilots, and conversational agents—while maintaining rigorous engineering standards across DevOps, observability, and frontend/backend architecture. Deep experience in embedding optimization, prompt engineering, fine-tuning GPT models, and delivering generative AI(GenAI) products that drive measurable impact. Skilled in mentoring engineers, leading cross-functional AI initiatives, and aligning technical strategy with executive goals in fast-paced, innovation-driven environments. Passionate about building the next generation of human-centered AI systems.

Verifications

On time

100%

On budget

96%

Accept rate

49%

Repeat hire rate

5%

Portfolio

Portfolio

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5.0 · 24 Reviews
24 Reviews
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Steve C.

5.0

$4,800 USD

20 days ago

PHP Pear Migration to cPanel

Addressed all of the concerns and needs as discussed. Pleasure to work with. [14 May, 2026] Great to work with.

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Eunsook U.

5.0

$9,050 USD

3 months ago

Custom Feature Development & Integration

He went above and beyond to complete the project. Very collaborative throughout the process and maintained excellent communication from start to finish. A pleasure to work with.

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Lyle N.

5.0

$640 USD

3 months ago

Project for Hercules

Hercules efficiently identified issues with my existing program and clearly outlined a roadmap to fix it

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Manuel R.

5.0

$4,300 USD

5 months ago

Squarespace Checkout Streamlining for Meal Service -- 2

Very professional, great quality work, fast communication, easy to work with. Highly recommend!

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Experience

Zest AI

Feb, 2021 - Present

5 years, 3 months

Lead AI & Full-Stack Engineer

Feb, 2022 - Present

4 years, 3 months

● Led end-to-end delivery of AI features powered by LLMs across multiple enterprise systems and userfacing platforms, increasing operational efficiency by 35%. ● Designed and built Retrieval-Augmented Generation (RAG) pipelines using LangChain + pgvector for internal knowledge Q&A and semantic support agents, improving answer accuracy by 42%. ● Implemented OpenAI Function Calling agents to automate product recommendations, onboarding, and workflow decisions, reducing manual effort by 50%.

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Burbank, United States

Principal / Head AI Engineer

Feb, 2021 - Jan, 2022

11 months, 3 days

● Spearheaded the company’s first LLM initiative — from infrastructure design to capability prototyping — establishing a foundation for 100% of future AI-driven features.● Built early prompting pipelines for classification, summarization, and natural language autofill using GPT-3.5, reducing manual processing time by 40%. ● Structured metadata, embedding schemas, and ETL pipelines to support vector-based semantic search, enabling a future 35% improvement in knowledge retrieval accuracy.

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Burbank, United States

Feb, 2021 - Present

5 years, 3 months

Education

University of East London

1999 - 2000

1 year

MSc in AI & Data Science

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United Kingdom

1999 - 2000

1 year

University of East London

1996 - 1999

3 years

BSc in Computer Science

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United Kingdom

1996 - 1999

3 years

Publications

ExpressionEngine

2014

TrustRadius

ExpressionEngine is dream of any developer This is the best CMS on a market for developers. Turn your eCommerce project to a winner with Brilliantretail module. Anything can be accomplished without breaking your neck! No project will be brilliant without ExpressionEngine. Devot-ee is the place for all plugins needed to accomplish any project your client desires. http://www.trustradius.com/reviews/expressionengine-2014-04-08-08-34-47

2014

AWS Certified Solutions Architect

2010

Associate

The AWS Certified Solutions Architect – Associate certificate shows knowledge of cloud computing. It helps design secure and scalable solutions on Amazon Web Services (AWS). This certification is useful for IT professionals who want to improve their cloud skills.

2010

Certifications

P

Preferred Freelancer Program SLA

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