Shipped production open-source applications across modern frontend architecture, agent harnesses, agentic RAG, and backend patterns — deliberate depth-building across the stack.

• Watch-Vault (TanStack Start, React 19, Feature-Sliced Design) and athallarizky.com (Astro 6 SSR, PayloadCMS 3, Neon, R2) shipped as production OSS
• mini-harness — TypeScript agent loop with streaming and parallel tool calling (Anthropic SDK); project-story — LangGraph supervisor multi-agent
• End-to-end agentic RAG in Rent-House-AI (FastAPI, ChromaDB, bge-m3); Docsy — Laravel 11, Postgres 16 recursive CTEs + GIN search, Redis cache-aside
• KRL-MCP — Model Context Protocol server in Go (stdio JSON-RPC, go:embed) with a Go REST service behind Redis singleflight

Frontend technical ownership across core crowdfunding platforms, campaign portals, insurance webviews, and admin dashboards for Indonesia's largest crowdfunding ecosystem ($100M+ donations).

• Refactored the highest-traffic donation page — modular typed components and isolated state machines; zero-regression rollout of a new tipping vertical
• Architected wakaf & insurance campaign verticals — campaign-type-aware routing and modular layouts, one codebase serving three business domains
• Migrated legacy PHP pages to Astro 5 SSR + React islands; authored form design-system primitives eliminating duplication across five admin pages
• Multi-step onboarding flows on Zod + React Hook Form — conditional medical/non-medical validation and async NIK verification
• Internal AI tooling: Slack-thread RAG analyzer surfacing past #dev-bugs solutions; Grafana/Loki log translator for plain-language root-cause

Technical ownership across the maritime sailor talent portal, company CMS, and cross-platform mobile application.

• Sailor contract-management state machine (extend / terminate / transfer / rate) — conditional payload schemas, custom hooks, Yup validation
• Standardized the internal CMS on an Atomic Design component library — reusable form and data-table primitives
• React Native + Expo sailor onboarding — multi-step wizard with institution search, rank mapping, persistent stepper-state

Freelance build of a web-based monitoring platform for IoT hardware systems with real-time operational visibility.

• Built the monitoring UI with Next.js, TypeScript, and Chakra UI.
• Wired real-time data interaction through Axios and TanStack Query, with authentication and sessions via NextAuth.js.

Short engagement building an event-ticketing, course-delivery, and gated-content web platform.

• Delivered the platform with Next.js, TypeScript, and Chakra UI; state in Zustand, auth via NextAuth.js.

Web3 product engineering — comic-reader platform, NFT minting microsites, multi-gateway checkout.

• Re-architected the Kometh comic-reader around a modular config layer (wagmi / React Query / Web3Auth) with centralized contract ABIs
• High-concurrency NFT minting site (Supernormal) — countdown state machine, wallet eligibility, synchronized cache for launch drops
• Multi-gateway checkout and order state machines (Xendit, Stripe, DurianPay) with optimistic UI and error boundaries

Internship building gamified web experiences for Garena game events — landing pages, gacha mechanics, voting flows, and card-collection systems.

• Gamified event web apps for Free Fire, Call of Duty Mobile, and Arena of Valor — interactive voting, gacha, and reward flows serving millions of SEA players