Available for new opportunities

HELMI

Fullstack Engineer · Tech Lead · Go & Node.js

Building scalable platforms and developer tools. Currently leading product engineering at Mengantar.

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0+Years of Experience

0+Systems Shipped

0+Engineers Mentored

Portfolio

Selected Work

Pushing the boundaries of what's architecturally possible.

Backend System DesignFrontend

Berlapak B2B Platform

B2B marketplace platform connecting sellers and distributors for product sourcing. Led end-to-end architecture from API design to frontend delivery.

Next.jsNestJSPostgreSQLGo

Backend System Design

Data Migration Pipeline

ETL service migrating data from MongoDB to ClickHouse using Apache Airflow, and a separate Prefect pipeline moving data to ERPNext for business reporting.

GoApache AirflowPrefectClickHouseMongoDB

Backend System Design

Chatbot Export Service

Improved chatbot service infrastructure with a Go-based export pipeline for reviewed conversation data, enabling analytics and model fine-tuning workflows.

GoNode.jsMongoDBREST APIs

Expertise

The Stack

Technologies I've used to build systems at scale.

TypeScript

Node.js, Nest.js, REST & GraphQL APIs

Go

Backend services, CLI tools, microservices

Architecture

Microservices, event-driven, ETL pipelines

Databases

PostgreSQL, MongoDB, ClickHouse

React / Next.js

Next.js 15, App Router, performance

DevOps

Docker, Airflow, CI/CD, Prefect

Career

The Journey

From first lines of code to leading product engineering.

Developer Tools

The Toolkit

Micro-tools for the modern developer workflow.

studio-dev/tools

7 tools

~/json-formatter

JSON Formatter

Prettify, minify, and validate JSON with syntax highlighting and error detection.

FormatValidateMinify

~/cron-explainer

Cron Explainer

Translate cron expressions to human-readable schedules with next-run previews.

CronScheduleParser

~/objectid-inspector

ObjectId Inspector

Decode MongoDB ObjectIds into timestamps, machine hashes, PIDs, and counters.

MongoDBBSONDecode

~/api-estimator

API Estimator

Estimate API response times based on complexity, queries, and external dependencies.

PerformanceEstimateAPI

~/jwt-debugger

JWT Debugger

Decode and inspect JWT tokens — view header, payload claims, expiry, and issuer info instantly.

AuthJWTDecode

~/base64-converter

Base64 Converter

Encode text to Base64 or decode Base64 back to plain text. Supports URL-safe variant.

EncodeDecodeBase64

~/http-status

HTTP Status Ref

Searchable reference for all HTTP status codes with categories, descriptions, and use cases.

HTTPStatusReference

Articles

Notes from the Stack

Drafted by an AI agent team. One ideates, one writes, one reviews.

multi-agent · ideator → writer → reviewer

Computer screen displaying colorful code

May 3, 2026 AI-written

Your Codebase Is Not Ready for AI Agents

Agentic engineering only works when you've already done the boring architecture work. Here's how to audit your system — and why AI agents are the best architectural linter you've never hired.

agentic-engineeringsystem-designgolang

May 3, 2026 AI-written

Vibe Coding Will Wreck Your Production System (Unless You're a Senior Engineer)

AI coding tools are a multiplier, not an equalizer. Here's why vibe coding accelerates senior engineers and silently destroys systems built by everyone else — with data.

aisystem-designengineering-leadership

Database query analytics on a dark monitor

Apr 29, 2026 AI-written

The N+1 query problem isn't dead — it just moved up the stack

ORMs and dataloaders solved the obvious version. Then it came back as service-to-service calls, GraphQL resolvers, and serverless cold starts. Here's where to look now.

performancesystem-designmicroservices

Contact

Drop a message

Currently open to new opportunities, consulting, or just an interesting conversation about systems design.

helmifauzi.1996@gmail.com

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