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Handy Wijaya

Available to hire

I’m Handy Wijaya, an AI / Full Stack Engineer / Blockchain Developer based in Indonesia.

About

I’m Handy Wijaya, an AI / Full Stack Engineer / Blockchain Developer based in Indonesia. I build end-to-end systems across AI-powered customer service platforms, blockchain-integrated games, production-grade web applications, and interactive AR experiences. I’ve worked with LLM workflows including RAG, AutoRAG, and Human-in-the-Loop feedback, with a focus on optimizing inference on limited hardware.

I design scalable architectures that integrate multi-technology ecosystems to boost efficiency, reduce workload, and enhance user experience. I’m open to on-site or hybrid roles and am willing to relocate for the right opportunity.

  • 4 years' experience
  • Joined December 2025

Industry experience

  • Software & Internet
  • Gaming
  • Media & Entertainment
  • Professional Services

More experts in Sidoarjo, Indonesia

Work experience· 6 roles

Lead Engineer / Full Stack & AI Integration · CSHubJan 2025 – Present · 1 yr 11 mos

Led development of an AI-assisted customer service hub enabling multi-admin collaboration with observer & collaborator roles. Integrated local LLM (Ollama), RAG, AutoRAG, and Human-in-the-Loop feedback with a reranker model using Qdrant + PostgreSQL. Key features include auto-send AI responses, real-time collaboration, multi-document ingestion, embeddings, vector search, real-time typing indicators & notifications via WebSocket, and inference optimization for limited GPU resources (RTX 3070).

Blockchain Engineer – Smart Contract & Backend Integration · Creo EngineJan 2024 – Dec 2025 · 2 yrs

Developed the blockchain layer for the Creo Engine ecosystem: built the token smart contract (BSC-20) and NFT contract (BEP-721) for in-game characters/assets, implemented in-game character transfer bridging to Unity based on verified NFT ownership, and secure wallet-signature verification with backend services for bridging. Implemented in-game token system and supporting backend infrastructure.

Full Stack Developer · NiagaraLakeToba.comJan 2023 – Dec 2023 · 1 yr

Built a real-time hotel booking system with calendar availability and Doku payment gateway integration, plus automated payment confirmation and booking validation.

Software Engineer – Bot Detection & Anti-Scraping · FreelanceJan 2022 – Dec 2022 · 1 yr
AR Developer – Name Card Experience · FreelanceJan 2022 – Dec 2022 · 1 yr
Frontend/Full Stack Developer – Interactive Web Games · Freelance / Mini GamesJan 2022 – Dec 2023 · 2 yrs

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