Portfolio

Project Highlights

Enterprise-grade applications built for financial services, cloud infrastructure, and real business clients — designed for scale, security, and performance.

Public AppPROMISE Mobile App

Enterprise Financial Mobile Application

Role: Mobile Application Developer & Integration Engineer

Enterprise-grade financial mobile application for digital loan processing, balance tracking, QR payments, and secure digital identity verification (NDID), built with strong security and seamless third-party integrations. Publicly available on iOS & Android.

Technical Contributions

  • check_circleDesigned and developed the mobile application architecture with GetX state management and secure local storage.
  • check_circleImplemented advanced mobile security including Biometric Authentication, SSL Pinning, RASP, and Jailbreak/Developer Mode detection.
  • check_circleIntegrated enterprise APIs and NDID verification workflows for secure digital identity validation.
  • check_circleDeveloped document processing workflows with image capture, cropping, resizing, and optimization.
  • check_circleIntegrated QR payment systems, Firebase notifications, and LINE OA webhooks for real-time communication.

Tech Stack

FlutterGetXHiveDioFirebase Cloud MessagingNDID IntegrationLINE OA WebhookGoogle Maps API
Enterprise Financial Mobile Application
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EnterpriseDevOps & Infrastructure

Automated CI/CD & Cloud Infrastructure Monitoring

Role: DevOps & Infrastructure Implementer

Enterprise-grade automated CI/CD pipeline and cloud infrastructure monitoring system designed to streamline software delivery, secure deployment workflows, and provide centralized observability for containers and application services.

Technical Contributions

  • check_circleBuilt an automated GitLab CI/CD pipeline covering build and deployment workflows with Docker and AWS ECR.
  • check_circleImplemented secure GitLab Enterprise connectivity through OpenVPN for protected CI/CD execution.
  • check_circleOrchestrated containerized application deployment using Docker Compose and HTTPS routing via Caddy reverse proxy.
  • check_circleImplemented centralized observability stack using Prometheus, Grafana, Loki, and Fluent Bit for real-time metrics.
  • check_circleConfigured Amazon S3 for secure long-term log archival and improved incident troubleshooting workflows.

Tech Stack

AWS EC2AWS ECRAWS S3GitLab CI/CDDockerCaddyOpenVPNPrometheusGrafanaLokiFluent Bit
Automated CI/CD & Cloud Infrastructure Monitoring
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Full StackPrapade & FishConnect Apps

Freelance End-to-End Application System

Role: Full-Stack Mobile Application Developer

Delivered end-to-end business applications for real clients, covering requirement analysis, system design, mobile development, backend API implementation, database integration, and production deployment.

Technical Contributions

  • check_circleGathered and analyzed client requirements to design scalable business workflows.
  • check_circleDesigned end-to-end system architecture across mobile, backend, and database layers.
  • check_circleBuilt mobile applications with scalable UI architecture and state management.
  • check_circleDeveloped backend APIs, authentication systems, and CRUD business workflows.
  • check_circleIntegrated payment, notifications, file upload, reporting, and thermal printing services.
  • check_circleDelivered production-ready applications and provided post-deployment support.

Tech Stack

FlutterGetXFastAPINestJSPostgreSQLFirebase FirestoreRESTful APIsPayment IntegrationThermal Printing
Freelance End-to-End Application System
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More Work

Additional Projects

credit_score

Leasing & Financing System

SKL Smart Application

A specialized leasing application designed for dealers to process financing requests efficiently, featuring Smart Card Reader integration for ID verification and real-time application tracking.

FlutterSpring BootSmart Card SDKRESTful APIs
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Internal Document System

Promise Mobile Store

Internal document management app for loan approval with secure ID uploads, real-time branch sync, advanced image processing (auto-crop, resize), and digital signature integration.

FlutterRiverpodHiveImage ProcessingDigital Signatures
analytics

Internal Web Tool — Honda

ASH Redmine Export

Web-based reporting tool built with Vue.js for the back-office team, enabling efficient filtering and exporting of issue tracking reports to streamline workflow and data extraction.

Vue.jsPythonPostgreSQLReporting
integration_instructions

DevOps Setup

Flutter CI/CD Pipeline

Designed and set up CI/CD automation for Flutter applications using Jenkins Pipeline, enabling automated builds, testing, and deployment workflows.

JenkinsFlutterCI/CDFirebase

Contact

Have a project in mind?

I enjoy tackling complex engineering challenges — from mobile architecture to backend systems and cloud infrastructure. Let's talk.

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