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. Code was written — software was never engineered.
02
Requirements misunderstood
What the client said, what the developer heard, and what was built are three different things. Expensive rework, missed deadlines, lost trust.
03
AI code without engineering
AI generates code fast. Without experienced engineers directing and owning 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. We use every modern tool including AI. But engineering judgment directs every decision.

Systems thinking, not just features
Engineers design for the whole — scalability, failure modes, maintenance costs, security. Not just the ticket in front of them.
Architecture decisions have 5-year consequences
The database you choose, the API structure, the service boundaries — these compound. Bad calls made early cost months later.
Experience means anticipating failure
Network drop mid-transaction? Two users editing simultaneously? 3rd-party API down at 2am? We've seen it. We plan for it.
Security is invisible until violated
SQL injection, insecure tokens, auth flaws — AI-generated code is often functionally correct but 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. No shortcuts. No missing phases.
1
Requirements
2
PRD
3
Architecture
4
Build
5
Test
6
Deploy
7
Maintain
Services
Everything we build
One engineering team. Full-stack capabilities. Custom AI is one part of our offering — not a separate product.
01
Web Application Development
Full-stack web platforms, SaaS products, enterprise portals, dashboards, business management systems built to scale.
Next.jsReact.jsNode.jsLaravelMySQLAWS
02
Mobile App Development
iOS and Android apps, cross-platform mobile, real-time data sync, hardware device integration for healthcare and IoT.
iOSAndroidCross-platformNode.js
03
Enterprise Systems — ERP, CRM, WMS, OMS, TMS
Complex business logic, multi-system integration, large-scale data migration, legacy system modernization.
Java SpringC#OracleMS-SQLREST API
04
API Design & System Integration
REST and GraphQL APIs, third-party integrations, OAuth/JWT security, Swagger documentation, multi-branch network systems.
REST APIGraphQLOAuth/JWTSwagger
05
Cloud & DevOps Deployment
AWS cloud setup, own-server hosting, CI/CD pipelines, load balancing, SSL, scalable infrastructure for production.
AWS EC2S3Route 53ELBDockerCI/CD
06
Database Architecture & Migration
Database design, performance tuning, large-scale data migration (AS-IS to TO-BE), schema optimization, legacy data modernization.
OracleMySQLMS-SQLData ModelingMigration
07
Custom AI & LLM — Built Into Your Software
We build and integrate AI directly into your software. Not a generic chatbot — a custom AI trained on your data, your processes, your business logic. Owned by you. Deployed in your environment.
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 HuggingFace
Deployment
AWS cloud or your own server
We deploy where you need — scalable cloud on AWS or fully managed on your own servers. Both paths are production-grade.
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 & Automation Tools
AI Agentn8nCursorJira
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
We believe transparency builds better partnerships. Here's how we engage, what you own, and how we protect your idea from day one.
Fixed-Price Project
Defined scope, fixed budget. Best for well-scoped products.
Full PRD before development
Milestone-based payments
Scope change process defined
Full IP transfer on completion
Monthly Retainer
Ongoing capacity. Best for active development or maintenance.
Dedicated hours per month
Weekly progress reporting
Priority response SLA
Rolling 30-day cancellation
Time & Materials
Flexible for evolving requirements. Pay for actual hours.
Hourly or daily rate
Weekly time reporting
Adjust scope anytime
Minimum engagement period
Staff Augmentation
Senior engineer embedded in your team. Your tools, our expertise.
Full-time or part-time
Works in your systems
NDA signed before discovery
3-month minimum term

All engagements: NDA before discovery · Full IP on payment · Source code handover · Documentation

Developer Budget
Transparent monthly rates
Labor cost only — no overhead, no hidden fees. Build your team and know your monthly investment before we talk.
Role Level Monthly (USD) Notes
Frontend Developer Junior $2,500 – $4,000 UI implementation, guided work
Frontend Developer Mid $4,500 – $7,000 Independent feature delivery
Backend Developer Mid $5,000 – $8,000 APIs, databases, business logic
Backend Developer Senior $8,000 – $13,000 Architecture + implementation
Full-Stack Developer Senior $9,000 – $14,000 End-to-end ownership
QA / Test Engineer Mid $3,500 – $6,000 Manual + automated testing
DevOps / Cloud Engineer Senior $8,000 – $12,000 CI/CD, infrastructure, deployment
AI / LLM Engineer Senior $10,000 – $16,000 LLM integration, RAG, fine-tuning
Tech Lead / Architect Lead $12,000 – $18,000 Team direction + system design
Team Budget Calculator — add roles to estimate monthly cost
Estimated monthly total (labor only)
$0/ month
Get Started

Ready to build something
that actually works?

20 years of engineering discipline. Zero shortcuts. Tell us what you need — we'll respond within 24 hours.

Tell us about your project

Free initial consultation · NDA available before discovery · Response within 24 hours

Engagement options

Contract Types
Fixed-Price Project
Defined scope, fixed budget, milestone payments.
Monthly Retainer
Ongoing capacity with dedicated hours per month.
Time & Materials
Flexible engagement — pay for actual hours worked.
Staff Augmentation
Senior engineer embedded in your team.
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