Engineering Portfolio

Raka Widhi Antoro

Blockchain Engineer · Backend & Full stack Systems Builder

I build production systems across smart contracts, backend services, data infrastructure, internal operations tooling, and cloud environments - from architecture and implementation through deployment, observability, and ongoing production support.

Profile

Backend and Blockchain Engineer with 6+ years of professional experience building production backends, smart contracts, fintech infrastructure, Full stack internal tools, and AI-enabled developer products. Recent work at FORU.AI covers token distribution, NFT badge contracts, marketing data systems, cloud migration, operational dashboards, and internal market-making tooling.

6+ yrs
Professional engineering experience across fintech, blockchain, backend, and infrastructure.
End-to-end
Ownership across smart contracts, APIs, databases, frontend, deployment, and production operations.
3 packages
Published npm developer tools spanning Solidity analysis and Indonesia-specific utilities.
Cost-aware
Hands-on optimization of API and cloud infrastructure costs without sacrificing delivery.

Work Experience

Blockchain Engineer / Full Stack Engineer

FORU.AI / Untukmu · Jakarta, Indonesia
Jul 2025 - Present
  • Upgraded the NFT Badge smart contract and supported blockchain functionality across the FORU ecosystem.
  • Built the backend and smart contracts for Phase 1 FORU token airdrop distribution from the ground up.
  • Recommended a lower-cost Twitter/X data-access approach that reduced recurring spend from hundreds of US dollars to tens of dollars.
  • Built a weekly marketing-data dashboard using Telegram reporting, Hasura GraphQL, PostgreSQL, and a Contabo server configured from scratch through production.
  • Supported migration of backend repositories, PostgreSQL, and Redis from GCP to OVHcloud; updated CI/CD through GitHub Actions and introduced Grafana and Cronicle.
  • Built Full stack market operations tooling for FORU/USDT on MEXC and Mobee, initially owning frontend, backend, database, deployment, and server operations.
ElysiaJSBunSolidityPrisma ORMPostgreSQLVue.jsGitHub ActionsGrafana

Blockchain & Backend Developer

Ozaru · Hong Kong / China
Aug 2023 - Sep 2024
  • Built smart contracts and production backend services for multiple client engagements.
  • Developed an AI-powered Telegram moderation bot using LangChain.
  • Created reusable frontend helper utilities for blockchain integration.
  • Collaborated with engineering and product teams on architecture and product flow.
TypeScriptNode.jsPostgreSQLSolidityLangChainOpenAI API

Blockchain Expert

GreatEdu · South Jakarta, Indonesia
Sep 2023 - Oct 2023
  • Delivered practical blockchain education to university students participating in Indonesia's Kampus Merdeka Belajar program.
BlockchainEthereumSolidityTechnical Communication

Polygon Developer

IBF Net Group · Tangerang, Indonesia
May 2023 - Sep 2023
  • Built NFT Marketplace smart contracts and helper functions for backend/frontend blockchain integration.
  • Worked with Full stack developers to refine product flow and technical implementation.
PolygonSolidityHardhatTypeScriptExpress.js

Blockchain Developer

Blocktogo · Indonesia
Jan 2023 - Apr 2023
  • Built the smart-contract and backend foundation for a gold-backed stablecoin platform from scratch.
  • Contributed across architecture, contract implementation, backend services, testing, deployment, and infrastructure.
SolidityHardhatNestJSMySQLDockerCI/CD

Blockchain Developer

Tokocrypto · South Jakarta, Indonesia
Jun 2021 - Dec 2022
  • Built NFT Marketplace and IDO smart contracts.
  • Created backend/frontend integration helpers and collaborated on product flow across engineering teams.
  • Completed two consecutive Blockchain Developer assignments during a total tenure of 1 year and 7 months.
SolidityHardhatTruffleNestJSReactRedis

IT Head / Full Stack Developer

PT Rupiah Digital Indonesia · Jakarta, Indonesia
Aug 2019 - Sep 2022
  • Led development of IDR Private, a micropayment platform designed for low-value online transactions.
  • Owned APIs, customer-facing interfaces, admin systems, payment-gateway integrations, infrastructure, and delivery workflows.
  • Held overlapping responsibilities as Full Stack Developer and IT Head, combining implementation with technical leadership.
NestJSExpress.jsVue.jsReactMySQLDockerJenkins

Administrative

Beasiswa Anak-Anak Terang (AAT) · Indonesia
May 2017 - Dec 2020
  • Identified scholarship candidates, communicated information to donors, and maintained accurate candidate records through the organization's website.

Selected Projects

Flagship · Blockchain Security + AI

Kritisi Explorer

Dec 2024 - Present

A multi-chain blockchain explorer and smart-contract analysis platform focused on contract visualization, audit insights, security reporting, and developer-friendly review workflows.

AI-assisted vulnerability and code-quality analysis.
Contract documentation and best-practice guidance.
Full stack, multi-chain, and open-source product direction.
NuxtVue.jsTypeScriptGemini AISolidity Analysis
Web3 Product

Mini URL Fun

Jun 2025

A decentralized slug/NFT platform exploring tokenized naming, blockchain-based ownership, and more approachable identifiers for Web3 products.

BlockchainNFTTypeScriptFull Stack
Applied AI

Apai - AI Health Assistant

Nov 2024 - Present

An AI-assisted health-information prototype that helps users explore symptom, medication, and pharmacy information. Designed as informational support, not a replacement for professional diagnosis.

QuasarVue.jsTypeScriptLangChain
Utility App

Text Generator Pro

Oct 2024 - Present

A multi-purpose mobile-ready utility for password generation, random-number generation, and Ethereum wallet creation.

Vue.jsQuasarTypeScriptAndroid
Market Data

Crypto Converter

Jul 2024 - Present

A cryptocurrency converter and market-information application with live pricing, Bitcoin/Ethereum unit conversion, analytics, and historical data.

Vue.jsQuasarTypeScriptMarket APIs

Open-Source Packages

kritisi v1.5.2

AI-assisted Solidity security audit CLI/tool for vulnerability detection, code-quality review, documentation, and best-practice checks.

sol-type-check v1.0.3

Lightweight JavaScript/TypeScript validation utility for Solidity types, Ethereum addresses, and transaction hashes.

id-mobile-detector v1.0.2

Lightweight library that detects Indonesian mobile operators from phone-number prefixes.

Kaggle & Data Contributions

Dataset / NotebookContributionPortfolio Signal
Indonesian Public CompaniesCurated IDX public-company data supported by a related scraping workflow and notebook.Scraping & data engineering
Mobile Operator PrefixesPhone-prefix dataset and notebook that also form the data foundation for id-mobile-detector.Data-to-library pipeline
Regional Languages & AreasAn evolving dataset mapping Indonesian regional languages and where they are used.Local-data curation
Indonesia Affordable HousingNational housing dataset with exploratory analysis and a prediction notebook.Applied analysis & ML

Communication & Recognition

Technical Writing

Shares practical perspectives on smart-contract security, Ethereum token standards, backend performance, RabbitMQ versus Kafka, serverless infrastructure, TypeScript/Bun/ElysiaJS, and AI API integration.

GitHub Arctic Code Vault Contributor

Recognized in the GitHub Archive Program 2020. Contributions to SangBaik/ExampleBaik and SangBaik/SangBaikSublimeSyntax were preserved across two archived repositories.

Education

STIKOM Yos Sudarso Purwokerto

Bachelor of Computer Science, Information Systems · GPA 3.44