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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.…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.

Handy Wijaya

Full Stack Developer, Blockchain Developer, AI Engineer, +2

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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.…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.

Available to hire

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.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Work Experience

Lead Engineer / Full Stack & AI Integration at CSHub

January 1, 2025 - Present

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 at Creo Engine

January 1, 2024 - December 31, 2025

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 at NiagaraLakeToba.com

January 1, 2023 - December 31, 2023

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

Frontend/Full Stack Developer – Interactive Web Games at Freelance / Mini Games

January 1, 2022 - December 31, 2023

Developed browser-based memory game, dice roll, spin wheel, and scratch-card games; authored reusable game logic with pure JavaScript/jQuery; optimized for lightweight performance with minimal dependencies.

AR Developer – Name Card Experience at Freelance

January 1, 2022 - December 31, 2022

Created AR-enabled business card experiences using Three.js/WebXR (web) and Unity/Vuforia; delivered interactive 3D animations triggered by physical cards.

Software Engineer – Bot Detection & Anti-Scraping at Freelance

January 1, 2022 - December 31, 2022

Designed and implemented a two-layer bot detection and anti-scraping system across multiple web applications; backend signals (IP behavior, request patterns) and frontend signals (mouse/temporal patterns) with blocking, rate-limiting, and adaptive responses.