20+ Years of Engineering Discipline

Real software. Built by engineers. Delivered right.

I'm a senior full-stack developer with 20+ years of experience, looking for freelance projects and part-time work alongside a small group of 2 trusted developers. No sales team, no account managers — just an experienced engineer who cares about your project as much as you do.

20+
Years experience
8+
Industries served
4
Countries deployed
15+
Technologies
The Problem
Why most software projects fail
Most projects don't fail because of bad ideas. They fail because engineering discipline was skipped. We never skip it.
01
No engineering process
Built fast, broken in production. No requirements phase, no architecture review, no test strategy.
02
Requirements misunderstood
What the client said, what the developer heard, and what was built are three different things.
03
AI code without engineering
AI generates code fast. Without experienced engineers directing the output — you accumulate technical debt at machine speed.
Why Engineers
Experience is the multiplier

AI can write code. Only an experienced engineer can take responsibility for it — knowing when it's right, when it's dangerous, and when it needs to be rethought.

Systems thinking, not just features
Engineers design for the whole — scalability, failure modes, maintenance costs, security.
Architecture decisions have 5-year consequences
The database you choose, the API structure, the service boundaries — these compound.
Experience means anticipating failure
Network drop mid-transaction? Two users editing simultaneously? We've seen it. We plan for it.
Security is invisible until violated
SQL injection, insecure tokens, auth flaws — AI-generated code is often security-naive. We think adversarially by default.
Our Process
Every step. Every time.
We don't start coding until requirements are truly understood. We don't ship until testing is complete.
1
Requirements
2
PRD
3
Architecture
4
Build
5
Test
6
Deploy
7
Maintain
Services
Everything we build
01
Web Application Development
Full-stack web platforms, SaaS products, enterprise portals, dashboards.
Next.jsReact.jsNode.jsLaravelMySQLAWS
02
Mobile App Development
iOS and Android apps, cross-platform mobile, real-time data sync.
iOSAndroidCross-platformNode.js
03
Enterprise Systems — ERP, CRM, WMS, OMS, TMS
Complex business logic, multi-system integration, legacy system modernization.
Java SpringC#OracleMS-SQLREST API
04
API Design & System Integration
REST and GraphQL APIs, third-party integrations, OAuth/JWT security.
REST APIGraphQLOAuth/JWTSwagger
05
Cloud & DevOps Deployment
AWS cloud setup, CI/CD pipelines, load balancing, SSL, scalable infrastructure.
AWS EC2S3Route 53ELBDockerCI/CD
06
Database Architecture & Migration
Database design, performance tuning, large-scale data migration, schema optimization.
OracleMySQLMS-SQLData Modeling
07
Custom AI & LLM — Built Into Your Software
We build and integrate AI directly into your software. Custom AI trained on your data, your processes, your business logic.
Custom business chatbot (RAG)
Internal knowledge AI
AI process automation
Fine-tuned domain model
LLM API integration
AI decision support
OpenAIClaude APILlama 3LangChainRAGVector DBn8nHuggingFace
jangq.ai vmlx.net GitHub
Deployment
AWS cloud or your own server
AWS Cloud Deployment Recommended
EC2 — scalable compute instances
Elastic Load Balancing — high availability
Route 53 — DNS and domain routing
S3 — storage, assets, backups
Certificate Manager — SSL/TLS security
GitHub Actions CI/CD pipelines
Own Server / On-Premise Enterprise
Linux server setup and administration
Apache / Nginx web server configuration
Database server management (Oracle, MySQL)
Sun Solaris and IBM AIX enterprise platforms
Windows-to-Linux server migration
On-premise ERP and enterprise system hosting
Experience
20 years. Real systems. Real industries.
20+
Years experience
8+
Industries served
15+
Languages & frameworks
4
Countries deployed

Domain Expertise

Healthcare
CCM/RPM portals, lab management, hardware device integration, iOS/Android
Logistics & Supply Chain
OMS, WMS, TMS, cargo systems, 1,200+ branch REST API
Government & Insurance
National insurance DB, postal network, COBOL-to-Oracle migration
Enterprise Retail
Large-scale e-commerce, seller portals, POS integration
Manufacturing & IoT
ESL hardware integration, POS-to-E-paper sync
Automotive R&D
Breakdown tracking, vehicle diagnostics, failure modeling
Media & Broadcasting
Web platforms, iOS/Android streaming, radio systems
Aviation Cargo
TMS, AWB/ULD tracking, robot control app

Career Timeline

2024–Now
AI-Powered Software Development
Full-Stack · AI Integration · Automation
Cursorn8nLLM APIAWS
2020–2024
PM & Full-Stack Developer
Healthcare Platform — USA
Next.jsLaravelAWSiOS/Android
2018–2019
Full-Stack Developer & Tech Lead
Global Logistics OMS — Korea
Java SpringLaravelAngularJS
2016–2018
Oracle DBA & Backend Developer
Government Postal Network — Malaysia
OracleREST API ×1,200
2013–2016
Backend Developer & Platform Engineer
Enterprise Retail — Korea & Vietnam
PHPOracleREST API
Before 2013
Developer — Aviation, Government, Automotive, Media
Korea & USA · 6+ industries
JavaOracleC#C++
Tech Stack
Current technology
Frontend
Next.jsReact.jsAngularJSNode.js
Backend
LaravelJava SpringPythonC#PHP
Database
OracleMySQLMS-SQL
AI & Automation
OpenAIClaude APILlama 3LangChainn8nCursor
Cloud — AWS
EC2ELBS3Route 53ACM
DevOps
DockerGitHub CI/CDLinuxNginx
API & Security
REST APIGraphQLOAuth/JWTSwagger
Mobile
iOSAndroidCross-platform
AI Tools
AI Agentn8nCursor
Credentials
Certifications & Training
CE
Industrial Engineer — Information Processing
Government Certification · Korea · 2005
DB
Relational Database Modeling
Samsung Education Center
OR
Oracle Tools — Developer, Discoverer, Designer
Oracle Korea Education Center
MS
Supporting Microsoft Windows Core Technologies
Microsoft MCP Group
Engagement
Transparent terms
Fixed-Price Project
Defined scope, fixed budget.
Full PRD before development
Milestone-based payments
Full IP transfer on completion
Monthly Retainer
Ongoing capacity.
Dedicated hours per month
Weekly progress reporting
Rolling 30-day cancellation
Time & Materials
Flexible, pay actual hours.
Hourly or daily rate
Weekly time reporting
Adjust scope anytime
Staff Augmentation
Senior engineer embedded in your team.
Full-time or part-time
NDA signed before discovery
3-month minimum term
Get Started

Ready to build something
that actually works?

20 years of engineering discipline. Zero shortcuts. Tell us what you need — response within 24 hours.

Tell us about your project

Free initial consultation · NDA available · Response within 24 hours

Engagement options

Always included
NDA signed before any discovery
Full IP ownership on payment
Source code handover
Complete documentation
All 7 engineering steps — every project
20+
Years experience
8+
Industries served
4
Countries deployed
24h
Response time