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Nathanael Valentino Davis

@nathanaelvalentinoda

Full-stack developer at PT. Mejik Utama Sugiharta building ticketing systems for Taman Mini Indonesia Indah and entertainment venues.

Indonesia

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At PT. Mejik Utama Sugiharta, I developed a ticketing system for Taman Mini Indonesia Indah that supports onsite ticket purchases through mobile point-of-sale systems and real-time visitor management. I also engineered a ticketing application for entertainment venues using Flutter, Express.js, and TypeScript, with payment gateway and bank API integrations.

At MemoryLane, I built AI workflows for voice-activated bookings and improved streaming reliability and response latency. I also worked on full-stack applications, including participant management, admin dashboards, and a WhatsApp partnership bot. Earlier, I maintained and developed Go-based backend application generators at PT. Mejik Utama Sugiharta and Kontenbase.

Experience

Work history, roles, and key accomplishments

Current

FullStack Engineer

Current

PT. Mejik Utama Sugiharta

Feb 2024 - Present (2 years 7 months)

Created a ticketing system for Taman Mini Indonesia Indah (TMII) with mobile point-of-sale and real-time visitor management.

Ticketing Systems Mobile Point of Sale (mPOS)Real Time Management

Current

Full-stack Developer

Current

PT. Mejik Utama Sugiharta

Feb 2024 - Present (2 years 7 months)

Developed a mobile application using Flutter and a robust backend with Express.js for an Influencer Marketing Agency, connecting brands with influencers.

Flutter ExpressJS Mobile Development Backend Development

Current

BackEnd Developer

Current

PT. Mejik Utama Sugiharta

Jun 2022 - Present (4 years 3 months)

Served as key maintainer and developer for Microgen v3, a backend application generator built with Go, responsible for upkeep and feature development.

Go Backend Development Application Generator

Backend/LLM Engineer

MemoryLane

Dec 2025 - Aug 2026 (8 months)

Built end-to-end AI service workflows with real-time intent extraction and slot filtering. Hardened LiveKit streaming and Azure TTS performance, reducing latency and costs.

AI LLM LiveKit Azure AI Speech Firestore Supabase Token Tracking Workflow Automation

FullStack Engineer

MemoryLane

Dec 2024 - Dec 2025 (1 year)

Architected a full-stack React application with server-side rendering and role-based access. Implemented participant management, admin suite, and public APIs.

React Remix TypeScript Supabase PostgreSQL Drizzle ORM Firebase Firestore Cloud Tasks Redis Sentry Google AI NodeJS ETL

BackEnd Developer

Kontenbase

Jun 2022 - Jun 2023 (1 year)

Served as key maintainer and developer for Kontenbase, a backend application generator built with Go, implementing KafkaJS for real-time processing and managing payment subscriptions.

Go KafkaJS Xendit Paddle Backend Development