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Herman Donawan

Herman Donawan

AI Developer & Programmer

Available for freelance / full-time

Building low-latency AI agents & RAG systems that run 24/7 in production.

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Herman Donawan

AI Developer & Programmer

  • LocationBoyolali, Central Java, Indonesia
  • Emailkangmaswawan21@gmail.com
  • Local Time (WIB)--:--:--

About

AI Engineer building production LLM systems: RAG pipelines, RLHF evaluation frameworks, autonomous agents. Shipped voice-driven AI avatar serving 10k+ daily interactions. Full-stack (Next.js, FastAPI, Docker, Vercel/AWS).

3+

Years Experience

15+

Projects Built

3

Platforms

Focus areas

LLM Evaluation (RLHF)Autonomous AgentsAI Voice DataPrompt EngineeringWeb3 / DeFi

Featured Projects

Interactive AI Avatar / Radio DJ System

Real-time streaming app where a live AI avatar reads chat, responds to comments, and runs a 24/7 radio show. 10k+ daily interactions, <200ms latency.

GitHub

Autonomous DeFi Liquidity Agent

Self-running agent analyzing DLMM liquidity positions on Solana, executing data-driven rebalancing. Hermes orchestration, on-chain execution.

GitHub

Tech Stack

Engineering

PythonTypeScriptNext.jsFastAPIDocker

AI & LLM

LLM Evaluation (RLHF)Prompt EngineeringRAG Pipelines (LangChain, LlamaIndex)Vector Databases (Weaviate, Pinecone)Autonomous Agents (Hermes, CrewAI)

Voice & Audio

Multilingual Voice Actor (EN / ID / JV)AI Voice Data GenerationTTS Pipeline (Coqui, ElevenLabs, OpenAI)ASR (Whisper, Faster-Whisper)Real-time Voice Streaming

Experience

2023 — Present

  1. Freelance AI Contributor

    2023 — Present

    Outlier

    • Designed RLHF evaluation pipeline for 50k+ coding samples; improved model pass@1 by 14% on HumanEval.
    • Built automated quality gates reducing annotation cost 30% via prompt engineering & model-based eval.
    • Curated multilingual audio datasets (EN/ID/JV) for voice AI training; 200+ hours validated.

  2. Freelance Python & AI Developer

    2023 — Present

    Upwork

    • Delivered 12+ client projects: LLM-powered automation (FastAPI + LangChain), voice AI pipelines (TTS + Whisper), DeFi analytics dashboards (React + Python).
    • Maintained 5.0/5.0 rating across 15+ contracts; 100% on-time delivery.
    • Designed autonomous agent architectures using Hermes for on-chain DeFi operations.

  3. Community Ambassador

    2023 — Present

    Base Ecosystem

    • Drove Web3 education & DeFi awareness across 5k+ community members; organized 8+ technical workshops.
    • Fostered developer engagement: guided 50+ builders through Base onboarding, smart contract deployment.

Live SOL Price

RAG Playground

Ask me anything about documents...

Voice Agent

Tap to demo voice

More Projects

Data Science & EDA Portfolio

Collection of Kaggle notebooks: cleaning, exploration, feature engineering, model evaluation on real-world datasets. 15+ notebooks, 500+ views.

KaggleJupyterpandasscikit-learn
Kaggle

RAG SaaS — Multi-tenant Document Q&A

Docs
Chunks
Weaviate
Answer
Next.jsFastAPILangChainWeaviate
Live DemoGitHub

Voice Data Exploration: Gujarati Digits

Exploratory Data Analysis (EDA) on audio data, extracting key metrics like duration, sample rate, RMS energy, Signal-to-Noise Ratio (SNR), and Voice Activity Detection (VAD). Visualizes audio characteristics and quality.

PythonLibrosaPandasMatplotlib
Kaggle NotebookGitHub Repo

By the Numbers

10k+

Daily Interactions

<200ms

Avg Latency

99.9%

Uptime

15+

Notebooks

Skills

Engineering

  • Python
  • TypeScript
  • Next.js
  • FastAPI
  • Docker
  • Git/GitHub
  • CI/CD (GitHub Actions)
  • PostgreSQL
  • Redis

AI & LLM

  • LLM Evaluation (RLHF)
  • Prompt Engineering
  • RAG Pipelines (LangChain, LlamaIndex)
  • Vector Databases (Weaviate, Pinecone)
  • Autonomous Agents (Hermes, CrewAI)
  • Hermes Agent Framework
  • Model Fine-tuning (LoRA/QLoRA)
  • Model Serving (vLLM, TGI)

Voice & Audio

  • Multilingual Voice Actor (EN / ID / JV)
  • AI Voice Data Generation
  • TTS Pipeline (Coqui, ElevenLabs, OpenAI)
  • ASR (Whisper, Faster-Whisper)
  • Real-time Voice Streaming

Available for new projects

Let's build something intelligent together.

I'm available for AI engineering, LLM evaluation, voice data, and automation projects. Questions, ideas, or just want to say hi — my inbox is open.

Book 15min Call