Startups and MVPs
Build the first launchable version, validate the business model, integrate payments or memberships, and stay within budget.
Freelance Development
Josh Chen 陳宏瑋
Freelance development for apps, websites, systems, and automation
Turn your software needs into a launch-ready, maintainable product.
I help turn requirements into clear product flows, then build apps, websites, admin systems, APIs, AI tools, and automation with testing, deployment, app-store release, and maintenance. Best fit for MVPs, legacy rebuilds, multi-brand wrapper apps, internal system digitization, AI support systems, and business projects that need to ship quickly.
If you have an idea but not a clear feature scope, I can turn it into an estimable and shippable version.
If you have a legacy project no one wants to touch, I can take over, refactor, fix, track, launch, and maintain it.
If you need app, admin, API, and automation together, you do not need to coordinate multiple engineers.
If you want AI in a real workflow, I can integrate OpenAI / LLM features for support translation, assisted replies, and internal tools.
If you need multi-brand or wrapper apps, I can handle packaging, settings, signing, review submission, and version management.
PRODUCT SYSTEM
Build Scope
iOS / Android / Web
10+
Years of software and app development
100+
App / Web / system project experience
iOS + Android
Native, Flutter, and wrapper apps
Full-cycle
Scope, build, deploy, launch, maintain
Good Fit
You may be looking for this kind of technical partner
Not just coding. I help clarify scope, ship versions, and launch real products.
Internal Business Workflows
Turn spreadsheets, paper forms, approvals, warehouse checks, logistics queries, and reports into trackable web or app systems.
AI Support and Global Communication
Build support systems, real-time AI translation, multilingual conversation support, and reply workflows for overseas customers.
Rescue Existing Projects
Take over apps or systems with crashes, old SDKs, app-store issues, feature backlog, or incomplete handoff from previous engineers.
Multi-brand and Wrapper Apps
Create iOS / Android wrapper apps, multi-version packaging, brand replacement, store metadata updates, and version control.
Deliverables
What I Can Deliver
Services can be combined around your business goal instead of split across multiple vendors.
iOS / Android App Development
Native iOS / Android and Flutter cross-platform development with Swift, Objective-C, Kotlin, Java, and Flutter. I can build from zero or maintain existing projects.
iOS / Android Wrapper Apps
Wrapper apps for both iOS and Android, including multi-version packaging, branding, feature trimming, signing, store review, and version management.
Websites, Admin Systems, and Internal Tools
Build landing pages, brand sites, admin portals, internal operation apps, ERP-like tools, warehouse, inspection, and approval systems that replace paper forms and manual workflows with trackable digital processes.
Desktop Tools and Automation
Windows / macOS desktop tools, internal utilities, data processing, batch conversion, scripts, crawlers, and lightweight APIs to reduce repetitive work.
AI Integration and Support Systems
OpenAI / LLM integration for customer support, real-time AI translation, multilingual conversations, assisted replies, message records, and admin workflows.
APIs, ChatBots, and Integrations
Flask APIs, LINE Bot, webhooks, Firebase, payments, third-party login, analytics, and SDK integrations across apps, web, and internal systems.
Product Consulting and Takeover
Feature planning, priority decisions, architecture cleanup, project takeover, debugging, and app-store issue handling to reduce delivery risk.
Technical Base
Technology Behind Delivery
Swift
Objective-C
Kotlin
Java
Flutter
Python
Flask
Web Frontend
Backend API
Admin System
Desktop Tools
Windows App
macOS App
AI Integration
OpenAI API
LLM Workflow
AI Translation
Customer Service System
Automation
Android Native
iOS Native
UIKit
AutoLayout
CoreLocation
WKWebView
Firebase
LINE Bot
App Store
Google Play
Arxan
Fortify
Apple Wallet
Payment Flow
Proof
Product Scenarios Delivered
Real projects need more than demos. These scenarios show the complexity I can handle.
FinTech
01
KingCard
Crypto payment and card consumption product
Worked on payment app features, version output, top-up, card purchase, consumption flows, and multi-version packaging with maintainable product architecture.
Industrial
02
Guoding Steel App
Android business app listed on Google Play
An Android app for real industrial business usage, covering build, store release, maintenance, and Android-native delivery.
View Live App
AI / Support
03
AI Real-time Translation Support System
Windows / macOS support tool for multilingual communication
Built a support system and desktop tools with AI real-time translation to help support teams communicate smoothly with international customers.
Airline
04
EVA Mobile
Enterprise airline app maintenance, security, and release process
Provided front-end development and technical support, including Firebase Crashlytics, release-flow simplification, spec analysis, backend coordination, Arxan, and Fortify.
View Live App
E-Commerce
05
OB Design
Hybrid e-commerce app rebuild and UX improvement
Rebuilt a Cordova project toward Native + WKWebView architecture, adding app interactions, marketing SDKs, tracking, and improved user experience.
View Live App
Sports Tech
06
FidoDarts
Dart machine data, ranking, and player information app
Worked on features and legacy Objective-C refresh for a darts player app connected to machine-data scenarios.
View Live App
E-Commerce
07
iSheBox
Fully native shopping app
Implemented registration, product browsing, checkout, and data collection for a native shopping experience.
Logistics
08
iLetsCargo
Freight quotation and enterprise logistics management
Integrated third-party login, push notifications, real-time chat, multilingual support, vehicle management, order ratings, and enterprise entry points.
Automation
09
LINE ChatBot
LINE official account and data sync for logistics
Used Python and LINE Messaging API for login, order management, document lookup, Flex Message display, webhooks, and support chat workflows.
Media
10
Insight Video Platform
Paid video and interaction app
Built a membership video platform with email verification, URL Scheme return, YouTube playback, payment integration, comments, livestream, and recording protection.
Mobility
11
CabRoly
Passenger and driver apps for ride-hailing
Built passenger and driver apps with ride requests, acceptance flow, location reporting, messaging, payment, and trip records.
More Work
More Projects
Additional client work is available but not all cases can be fully disclosed.
If you want examples closer to your industry or product idea, contact me and I can share the most relevant project experience.
Contact for MoreBackground
Relevant Delivery Background
KingCard
Payment app features, version output, wrapper-app collaboration, and remote development workflow.
EVA Mobile
Spec analysis, backend coordination, Firebase Crashlytics, security protection, vulnerability scanning, and release process improvements.
OB Design / iSheBox
Hybrid architecture rebuild, native shopping experience, marketing SDKs, tracking, and cross-team collaboration.
iLetsCargo
Logistics apps, internal systems, LINE Bot, Python backend, automation tools, multilingual flows, and location tracking.
AI Translation Support System
Windows / macOS desktop tools, support system, AI translation, multilingual communication, and enterprise workflow integration.
CabRoly
Passenger and driver apps, location reporting, push notifications, dispatch flow, payment, and trip records.
How We Start
Collaboration Process
1
Discuss goals and product direction
Clarify the problem, user flow, budget, and timeline before quoting, so the project starts with a practical product direction instead of vague feature requests.
2
Scope features and delivery milestones
Break the work into MVP, required features, and later phases, then define APIs, admin systems, apps, AI integration, release scope, estimates, and acceptance criteria.
3
Build, integrate, test, and review by stage
Deliver testable milestones while handling frontend, backend, SDKs, payment flows, push notifications, AI workflows, and edge cases for ongoing review.
4
Deploy, submit, and maintain after launch
Support production deployment, App Store / Google Play submission, signing, issue fixes, and version maintenance so the product can keep running after launch.
Let's Talk