David Alexander,

Software Engineer.

Jakarta, Indonesia

April 2026 - Present

Capella Multidana Finance

Fullstack Developer Intern

June 2026 - Dec 2026

DOPFMA Universitas Indonesia

Payment Automation Intern

May 2026 - Aug 2026

ClariPet

Freelance Fullstack Developer

Oct 2024 - Present

Exercise FTUI

Software Engineer

Tech Stack

Tools, languages and software I use.

TypeScript

Next.js

React

Nest.js

Node.js

Redis

Git

Docker

PostgreSQL

Projects

A showcase of my work.

List endpoint throughput at 50 concurrent users: 702 requests per second before, 4,054 after

Go Listings API

View on GitHub

A marketplace REST API written in Go on the standard library alone. Load-tested from 702 to 4,054 requests per second by capturing a baseline first, then finding and removing an N+1 hidden behind a goroutine pool.

PostgreSQL

Redis

Docker

ClariPet

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A paid, contracted e-commerce build for an Indonesian pet-care brand, live in production. Server-authoritative Midtrans payments, atomic order creation under row locks to prevent oversell, and live courier rates across 41 API endpoints.

Prime Capital Ledger

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A full-stack portfolio management and financial analytics platform for tracking holdings, ingesting broker statements, and monitoring performance across global equity markets.

AI Workflow Automation Tool

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A full-stack tool built to help users define, manage, and execute reusable AI-driven workflow templates in a dashboard.

Teknik Charity Run

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Full-stack registration and digital-payment platform for a UI-hosted charity race, serving 1,000+ registered users. Built as Software Developer at Exercise FTUI.

EXERTION 2025

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End-to-end competition registration platform with payment gateway and secure media pipeline, serving 500+ users with 100+ successful payments. Built as Software Developer at Exercise FTUI.