Available for new opportunities

HELMI

Fullstack Engineer · Tech Lead · Go & Node.js

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

HF

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

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

~/base64-converter

Base64 Converter

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

EncodeDecodeBase64

HTTP Status Ref

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

HTTPStatusReference

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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