Chasen

Hi, I’m

Backend Engineer · 3+ Years of Experience

Building scalable, high-performance systems with clean code and pragmatic architecture.

Core Competencies

Java 85%

Python 70%

Go 60%

SQL 75%

12

Projects

8.4K

GitHub Stars

99.9%

Uptime

🟢 SYSTEM ONLINE

v3.2.1

Full-Stack Infrastructure

Local Dev → VM → Oracle → XShell → WP

XAMPP

Ubuntu 22.04

Oracle 19c

XShell

Tech Stack

Java Spring Boot MySQL Redis Docker Git RESTful APIs Microservices

GUIDE Infrastructure Setup Walkthrough

1 Local Server Setup

# Start Apache & MySQL
sudo /opt/lampp/lampp start

# Create WordPress database
CREATE DATABASE wp_local;
GRANT ALL PRIVILEGES ON wp_local.* 
TO 'wp_user'@'localhost';

✅ XAMPP running on http://localhost

XAMPP Apache MySQL

2 Virtual Machine Setup

# VM Configuration
VBoxManage createvm --name "ubuntu-server"
VBoxManage modifyvm "ubuntu-server" 
  --memory 4096 --cpus 2
VBoxManage modifyvm "ubuntu-server"
  --nic1 bridged

✅ VM IP: 192.168.1.100

VirtualBox Ubuntu 22.04 Bridged

3 Oracle DB Remote Access

# Oracle listener config
lsnrctl status
lsnrctl start

# Remote connection string
jdbc:oracle:thin:@192.168.1.100:1521/XE
CREATE USER wp_remote IDENTIFIED BY 'secure_pass';

✅ Oracle accessible from host

Oracle 19c JDBC 1521

4 XShell SSH Connection

# XShell Session
Host: 192.168.1.100  Port: 22
Username: devops
# Authentication: SSH Key / Password

ssh devops@192.168.1.100

✅ Connected to Ubuntu VM

XShell 7 SSH Port 22

5 WordPress Deployment

# Download WordPress
wget https://wordpress.org/latest.tar.gz
tar -xzf latest.tar.gz -C /var/www/html/

# wp-config.php with remote DB
define('DB_NAME', 'wp_remote');
define('DB_HOST', '192.168.1.100:1521/XE');

✅ WordPress running!

WordPress 6.5 PHP 8.2 Remote DB

PROJECTS Recent Technical Practices

High-Concurrency Flash Sale

Redis + RocketMQ · Peak 5k QPS

Java Redis RocketMQ

API Gateway Unified Auth

Spring Cloud Gateway · JWT · Rate Limiting

Spring Gateway JWT

Distributed Tracing System

SkyWalking + Zipkin · Log Aggregation

SkyWalking ELK Docker

About Me

I’m Chasen, a backend engineer with 2+ years of hands-on experience designing, building, and optimizing distributed systems. I care deeply about code quality, system reliability, and developer productivity. I enjoy turning complex business requirements into clean, maintainable, and well-tested code.

Currently exploring: cloud-native architectures, performance tuning, and event-driven systems.

TERMINAL Live Session Log

      
      
      
      devops@ubuntu:~/projects
    
devops@ubuntu:~$ sudo systemctl status apache2
● apache2.service – The Apache HTTP Server
Loaded: loaded (/lib/systemd/system/apache2.service; enabled)
Active: active (running) since Mon 2026-06-15 10:32:18 UTC
📡 Port: 80 · PID: 2847
devops@ubuntu:~$ mysql -h 192.168.1.100 -u wp_user -p
Enter password: ********
Welcome to the MySQL monitor.  Commands end with ; or \g.
mysql> SHOW DATABASES;
+——————–+
| Database           |
+——————–+
| wp_local           |
| wp_remote          |
| information_schema |
+——————–+
3 rows in set (0.01 sec)
devops@ubuntu:~$ curl -I http://192.168.1.100/wordpress
HTTP/1.1 200 OK
Server: Apache/2.4.54 (Ubuntu)
X-Powered-By: PHP/8.2.12
✅ WordPress successfully deployed!

🖥️ Ubuntu 22.04 LTS 📦 Apache 2.4 🐘 PHP 8.2 🛢️ MySQL 8.0 🔗 SSH Established

DEV-OPS Full Infrastructure Setup Guide

Local Server

XAMPP/WAMP

VM Setup

VirtualBox/VMware

Oracle DB

Remote Access

XShell

SSH Connection

WordPress

Deployed ✅

🖥️ XAMPP 8.2 🐧 Ubuntu 22.04 🐘 Oracle 19c 🔌 XShell 7 📦 WordPress 6.5

Infrastructure Topology End-to-End

Local → VM → Oracle → XShell → WordPress

💻 Local

XAMPP

→

🖥️ VM

Ubuntu 22.04

↔

🐘 Oracle

19c · 1521

↔

🔌 XShell

SSH · 22

→

📦 WP

6.5 ✅

🔵 192.168.1.100 (VM IP) 🟠 192.168.1.100:1521 (Oracle) 🟣 ssh devops@192.168.1.100 (XShell) 🟢 http://192.168.1.100/wordpress (WP)

⚡ Avg Response Time

200ms

↓ 90% improvement from 2s

📊 Test Coverage

86%

↑ Continuously improving

🚀 Throughput

12k req/s

Peak handling capacity

📈 Service Availability

99.9%

SLA compliant

Certifications

AWS Certified Developer

Oracle Certified Professional, Java SE

Open Source

Spring Cloud Contributor

Apache Dubbo Documentation

Talks

QCon 2025 · Microservices Track

“High-Performance API Design in Practice”