Good afternoon, I'm Raja 👋

I am a 20-year-old fullstack developer with 2 years of professional experience.

I've built software solutions and technical platforms for organizations across diverse sectors, ranging from industrial water utilities and mining companies to travel and hospitality businesses.

Full-stack by profession, Frontend by passion

Resume

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Experience

My professional experience and educational background, side by side. Switch tabs to explore either one.

PT Krakatau Tirta Industri

Full-stack Developer (Intern)

Feb 2026 - Jun 2026Cilegon, Banten

Architected a device monitoring platform (Tauri, Express.js/Prisma backend, Next.js) deployed to 120+ devices with auto-update, GPS location history, and automated hardware/sleep-shutdown monitoring replacing manual IT checks after a laptop theft risked hardware and data loss.
Engineered offline-resilient telemetry collection in a Tauri background service, achieving 100% data retention across 120+ devices with up to 1,440 data points/hour via local persistence and batch-retry on reconnect.
Built a customizable geofencing system with Leaflet across 2 plant sites/5 sub-zones, generating device status alerts (offline, low battery, zone-exit) to detect unauthorized laptop removal from company premises.
Developed an automated app inventory with installed/removed program tracking across 120+ devices, cutting per-device audit time by 95% (10 min manual per device to instant lookup) after a pirated-software incident that carried significant financial and legal exposure.

PT Amman Mineral Industri

Full-stack Developer (Intern Project via PT KTI)

Apr 2026 - Jun 2026Remote, Sumbawa

Reduced per-entry chemical logging time by an estimated 85% (5-10 min manual to under 1 min) by building and deploying a chemical management system (Next.js, Prisma ORM, SQL Server) with QR-based usage recording and FIFO batch tracking (transaction-level locking, oldest-stock-first allocation) across 8+ locations and 8+ chemical types.
Cut management's stock-visibility lag by 99% (up to 24 hours to instant) by replacing once-daily paper-and-Excel closing reports with a real-time analytics dashboard surfacing consumption variance, critical stock, and reorder recommendations.
Built a monthly stock planning module with auto-suggested consumption estimates from historical usage across 8+ chemicals, replacing reactive, spreadsheet-based procurement.
Designed a mobile-first QR workflow with auto shift-detection and location-chemical validation, plus GHS hazard pictogram indicators for immediate risk visibility across 8+ sites.

PT Vinix Seven Aurum

Full-stack Developer (Intern)

Feb 2026 - May 2026Remote, Yogyakarta

Led development of a gamified waste-management platform (Next.js, Supabase, PostgreSQL) where users earn points from verified waste reports and redeem them for rewards via a public leaderboard.
Conducted user research with a 4-person team (interviews, empathy mapping, personas) to identify pain points, then validated the design via usability testing.
Designed the full rewards system from schema to UI: point/reward database schema, server-validated redemption flow with stock and balance checks, admin CRUD for reward management, and full transaction history.

Konco Hiling

Full-stack Developer (Intern)

Feb 2025 - Apr 2025Remote, Yogyakarta

Developed a travel platform (React 19, Vite, Tailwind CSS, Express.js, Prisma ORM, PostgreSQL) featuring tours with tiered pricing and day-by-day itineraries, car rentals, and destination listings.
Built a markdown blog editor with keyboard shortcuts and live preview, with tag-based routing that powers both editorial blog content and a community marketplace (Lapak) from a single content system.
Implemented a tiered pricing system with interactive group-size selection and auto-calculated savings badges, plus a booking form with customer details and trip preferences tied to each tour package.

Hotel Merlyn

Frontend Developer (Intern, then Freelance)

Jan 2024 - Feb 2024Serang, Banten

Built a responsive hotel website frontend (React.js, Tailwind CSS) with interactive UI components and cross-browser compatibility, improving accessibility across desktop and mobile.
Redesigned the website end-to-end (SEO, performance, mobile UX), nearly doubling monthly unique visitors (+102%) and total visits (+103%) compared to the 6-month pre-redesign average, while reducing average bandwidth per visitor.