Kohei Hishiyama - Technical Portfolio

Senior Full-Stack Developer & AI Co-Creation Specialist

Chapter 1: Why Choose Kohei Hishiyama

18 Years of Proven Track Record & Reliability - Supporting success for enterprises and SMEs since THINK DESIGN establishment in 2006

Cost-Efficient High Quality - Delivering equal or superior quality at 50-70% of major agency costs

Rapid Response Capability - Flexible handling of urgent projects through individual business agile decision making

Technical Superiority - Cutting-edge technology implementation leveraging AI co-creation development and proprietary SaaS product experience

Long-term Partnership - Focus on building continuous relationships rather than one-off projects

Performance Highlights - Why Kohei Hishiyama is Chosen

▶ Cost Reduction Results

▶ Speed Response Capability

▶ Results-Focused Performance

Chapter 2: Recent Project Portfolio

▶ In-house SaaS Product Development: ANTI SWIPER RUBIK

Proof of product development capability generating continuous revenue while maintaining operational costs at near-zero levels Pt.2(approximately ¥10,000 annually)

ANTI SWIPER RUBIK Demo Screenshot

↑ ANTI SWIPER RUBIK Official Website - Complete SaaS Platform

Value Proposition

Technical Advantages

Development Background

The development of ANTI SWIPER RUBIK began with a fundamental reconsideration of traditional one-dimensional slider concepts. Through actual operational experience in digital signage and exhibition venues, I confirmed strong demand for grid-based carousels that could deploy content omnidirectionally. To achieve both "true multi-directional infinite loops" and "intuitive navigation experiences" that existing libraries found difficult to realize, I developed a unique algorithm inspired by the Rubik's Cube through AI-assisted design and implemented it from scratch.

Key Features & Technologies

Core Language: JavaScript (ES6+)
Architecture: Modular design for flexibility and tree-shaking
Performance: Optimized for smooth transitions and minimal resource consumption
Multi-directional Infinite Loop: Patent-pending technology for truly seamless looping in all directions
Multi-directional Navigation: Omnidirectional grid-based movement system
Rubik Algorithm: Proprietary multi-dimensional loop control technology
Grid Layout: Flexible row-column configuration with customizable positioning
Mixed Media: Supports images, videos, and custom HTML content
Responsive: Perfect adaptation to various screen sizes and orientations
Digital Signage Optimization: Design focused on visibility and operability for large displays
Integration: Simple API for easy integration with any web project
Distribution: Global CDN delivery for fast loading times
Enterprise-Class Security: Robust authentication system with online verification and registered domain restrictions via API keys
Lightweight Design: Optimized for minimal file size while maintaining complete functionality including grid features (approximately 9KB)
Grid Management System: Highly editable JSON file-based grid library management
Sequential Library Support: Optional sequential scrolling library for smooth directional navigation
Dynamic Script Delivery: Personalized script generation and delivery system based on API key authentication
SaaS Infrastructure: Complete subscription-based service with automated billing via Stripe API integration
License Management: Secure domain-based licensing system preventing unauthorized redistribution
Server-Side Authentication: User registration information managed on server with API key-based authentication system
Edition Control System: Appropriate edition delivery based on subscription plan and server-registered user information
Real-time Verification: Online verification system that validates API keys against registered domain restrictions
Anti-Tampering Protection: Complete prevention of unauthorized usage through server-side script generation and delivery

Status: Operational - Product Page

▶ Operational SaaS Product: ANTI SWIPER

Proof of product development capability generating continuous revenue while maintaining operational costs at near-zero levels (approximately ¥10,000 annually)

ANTI SWIPER Official Site

↑ ANTI SWIPER Official Website - Complete SaaS Platform

Value Proposition

Business Results

Development Background

The initial concept for ANTI SWIPER arose from encountering limitations of existing slider libraries in my own web development projects. I needed a slider that could provide seamless infinite loops without visual glitches, operate smoothly on all devices, and efficiently handle diverse content types. Unable to find a solution meeting my stringent requirements, I decided to build my own from scratch using AI co-creation development methods.

Key Features & Technologies

Core Language: JavaScript (ES6+)
Architecture: Modular design for flexibility and tree-shaking
Performance: Optimized for smooth transitions and minimal resource consumption
Infinite Loop: Patent-pending technology for truly seamless looping
Mixed Media: Supports images, videos, and custom HTML content
Responsive: Perfect adaptation to various screen sizes and orientations
Integration: Simple API for easy integration with any web project
Distribution: Global CDN delivery for fast loading times
Enterprise-Class Security: Robust authentication system with online verification and registered domain restrictions via API keys
Lightweight Design: Optimized for minimal file size while maintaining complete functionality (approximately 7KB)
Library Management: Enterprise edition only - highly editable JSON file-based library management
Dynamic Script Delivery: Personalized script generation and delivery system based on API key authentication
SaaS Infrastructure: Complete subscription-based service with automated billing via Stripe API integration
License Management: Secure domain-based licensing system preventing unauthorized redistribution
Server-Side Authentication: User registration information managed on server with API key-based authentication system
Edition Control System: Appropriate edition delivery based on subscription plan and server-registered user information
Real-time Verification: Online verification system that validates API keys against registered domain restrictions
Anti-Tampering Protection: Complete prevention of unauthorized usage through server-side script generation and delivery

Sales & Distribution Mechanism

ANTI SWIPER is offered as a subscription-based SaaS (Software as a Service) product. I handle the entire sales process through my official website (anti-swiper.com), which includes detailed product information, demos, pricing plans, and a secure checkout process powered by Stripe.

Customer Success & Hospitality Approach

As part of the ANTI SWIPER family products, I prioritize subscriber success above all else. My hospitality-focused service approach ensures that every subscriber can utilize my products to their full 100% potential.

Status: Operational - Product Page

▶ Multilingual Corporate Website: THINK DESIGN

Showcase of Technical Capabilities

THINK DESIGN Corporate Website

↑ THINK DESIGN Corporate Website - Complete Japanese/English Support

Value Proposition

Technical Features

Development Approach

I approached my own website the same way I approach other client projects: starting with thorough target audience research, defining clear objectives, and implementing a design system that could scale across multiple languages and device types. This site functions as both my business platform and a live demonstration of my latest technology capabilities through AI-assisted efficient development processes.

Key Features & Technologies

Multilingual Support: Complete Japanese/English versions with proper localization
Responsive Design: Optimized for all devices from mobile to desktop
Clean Architecture: Semantic HTML5 and modern CSS3 with unified styling
Performance Optimization: Fast loading times and efficient resource management
Hero Slider: Powered by my own SaaS product ANTI SWIPER PRO
Taro Animation System: Custom Canvas-based particle animation using MST algorithm
Contact System: Integrated contact forms with anti-spam protection
Portfolio Showcase: Dynamic project presentation with case studies
SEO Optimization: Proper meta tags, structured data, and search engine optimization
Accessibility: WCAG compliant design ensuring usability for all users
Content Management: Easy-to-update structure for ongoing maintenance
Security: Comprehensive anti-spam and security measures

Design Philosophy

The THINK DESIGN website embodies my core design principles: clarity, functionality, and elegance. Every element serves a purpose, from typography choices that ensure readability across languages to navigation structures that intuitively guide users through my services and portfolio.

Status: Operational - Corporate Site

Corporate Website Development: THINK DESIGN 1st generation

▲ Website Japanese Screenshot (Placeholder)

▲ Website English Screenshot (Placeholder)

▲ Website Hindee Screenshot (Placeholder)

▲ Website Thai Screenshot (Placeholder)

▶ Project Overview:

This site was the original corporate website created at the founding of THINK DESIGN—a milestone project that pioneered our technical and creative direction. Built as a Single Page Application (SPA), it featured seamless navigation and dynamic content switching, with full support for four languages (Japanese, English, Hindeese, Thai) via JSON-based management. This approach enabled a global-ready, highly interactive user experience far beyond traditional static sites.

The most distinctive feature was its custom menu-linked slider UI, which directly inspired the later development of our flagship SaaS product, ANTI SWIPER. Unlike ordinary carousels, this slider offered a unique, interactive navigation experience tightly integrated with the site's structure. Despite being a SPA, all routing, animation, multilingual switching, and content management were handled entirely on the frontend, resulting in a lightweight yet powerful solution.

▶ Development Approach:

The site also set a high bar for design, animation, accessibility, and performance optimization—demonstrating technical excellence that stood out among corporate sites of its era. Although it was retired to align with the new branding introduced alongside ANTI SWIPER, this project remains a symbol of THINK DESIGN's spirit of innovation and technical ambition, and marks the origin of our next-generation product line.

▶ Key Features & Technologies Used:

▶ Legacy & Impact:

This project represents the foundation of THINK DESIGN's technical excellence and innovation spirit. The custom slider technology developed for this site became the cornerstone of our flagship SaaS product ANTI SWIPER, demonstrating how internal projects can evolve into successful commercial products. Although retired, this site remains a testament to our commitment to pushing the boundaries of web technology and user experience design.

The site was ultimately retired to align branding with the launch of ANTI SWIPER and transition to our current corporate identity. However, the production concept and technical implementation were exceptional, featuring an overwhelming level of sophistication despite its SPA architecture. The underlying mechanisms and technical approach represented a level of innovation that was truly ahead of its time.

Status: Archive - Go Archive Site

Chapter 3: Industry Portfolio - Versatile Cross-Industry Capabilities

※ Due to non-disclosure agreements, many achievements cannot be made public. Here are select examples from various industries.

▶ Food & Beverage

Selection Advantage: Specialized in mobile-era campaign systems and interactive promotional events

Featured Project: Pepperidge Farm Off-Style Campaign

During the feature phone era, I developed a lightweight device-based serial lottery event system. Campaign stickers with embedded serial numbers were attached to Pepperidge Farm products, enabling instant on-site lottery draws. Winners received original tote bags (shipped later), while non-winners got original wallpapers compatible with various device models.

Following Campbell Japan's brief, I handled the entire project from campaign format and design to lottery system mechanics and campaign execution. I conducted testing across dozens of feature phone models using rental booths. This successful first campaign led to it becoming a regular promotional format for the company due to positive response and sales results.

Key Projects: Pepperidge Farm Off-Style Campaign (Serial Lottery System), Omori Foods Co., Ltd. Corporate Website, Indian Restaurant Rajan Website / SNS Support

Clients: Meijiya, Campbell Japan, Shimokitazawa IRIE DINING BAR "TRIP", Omori Foods Co., Ltd., Indian Restaurant Rajan

▶ Publishing / Books / Media

Selection Advantage: Expertise in editorial and publishing industry-specific workflows

Key Projects: Miraisha Official Corporate Site, 'From Today, Hitman' Movie Special Page, Bunka Publishing Three-Part Project (MT Multi Blog)

Clients: Nihon Bungeisha, Bunka Publishing, Kenpakusha, Miraisha, Manga Grimm, Honwara, Jingi-naki Drama, S*Girl, Asakura Shoten

▶ Real Estate / Automotive

Selection Advantage: UI/UX design specialized for high-value product sales

Key Projects: Audi Yokohama Aoba Web Update Structure, Verena Series Promotion Page, Renos Funabashi Promotion Special Page

Clients: Audi Yokohama Aoba, Audi Japan, Nihon Sogo Jisho (Daiwa Jisho Residence), Act Cube Co., Azel Co.

▶ E-commerce / Fashion / Brands

Selection Advantage: Sales-direct EC optimization expertise

Key Projects: Space Shower Store EC Site, Oshman's Online EC Site, Wagokoro Co., Ltd. Brand Site Renewal

Clients: Space Shower Store, Oshman's Online, Wagokoro Co., Ltd.

▶ Medical / Dental

Pursued web design balancing trust and approachability for medical institutions, including smartphone support and reassuring site navigation.

Key Projects: Odaiba Yamamoto Dental Clinic, Hamizukai Website

Clients: Odaiba Yamamoto Dental Clinic, Hamizukai

▶ Corporate / Business

Designed and developed corporate sites and business support pages, achieving enhanced corporate image and effective information visualization.

Key Projects: Daiyoshi Co., Ltd. Corporate Website, Japan Resource Co., Ltd. Website

Clients: Daiyoshi Co., Ltd., Japan Resource Co., Ltd.

▶ Promotion / Campaign / LP

Produced high-impact landing pages and campaign sites quickly and with high quality, supporting Flash effects and special configurations.

Key Projects: ELK Fukuoka.com Campaign Site, Shibuya Fashion Festival Vol.03 Special Site, Takarazuka Certification Campaign Page

Clients: ELK Fukuoka.com, Tuning Shop RACE WARS, Shibuya Fashion Festival Vol.03, Takarazuka Certification Campaign

▶ Product / Goods Production & Promotion

Handle production of original goods and promotional items like smartphone cases and uniforms, tailored to brand image and target audience.

Key Projects: 株式会社LOOOP様 Co., Ltd. Smartphone Case Design, Ventforet Kofu (J-League) Smartphone Case Design, Penalty社カスタム Brand Uniform Design, Mizuno Brand Uniform Design

Clients: 株式会社LOOOP様 Co., Ltd., KFC, Ventforet Kofu (J-League), Penalty社カスタム, Mizuno

▶ Training / Education

Provided in-house education at web agencies and instruction at design schools, teaching HTML/CSS basics, wireframing, and UI design.

Key Projects: In-house education at web agencies (HTML/CSS basics, wireframing), Public vocational training school Web design training course instructor

Clients: Media Mart Co., Ltd., Nationally Commissioned Training Projects

Chapter 4: Competitive Advantages & Differentiation

▶ Cost Competitiveness

Item Major Agencies Kohei Hishiyama Reduction Rate
Basic Production Cost ¥2-5M ¥1-3M 40-50% Reduction
Monthly Maintenance ¥100-300K ¥50-150K 50% Reduction
Additional Modifications ¥50-100K/time ¥20-50K/time 60% Reduction

▶ Response Speed

▶ Technical Advantages

▶ Partnership Value

Chapter 5: AI Co-Creation Development Approach

▶ Next-Generation Development Methods

Revolutionary development process with AI technology as partners

Differentiation from Traditional Development

Chapter 6: Business Partnership Proposal

▶ Immediate Value Proposition

Contact & Consultation

Why not start with a free consultation?


Email: hello@thinkdsgn.com

Phone: +81 80 2780 7686


Kohei Hishiyama - Delivering Technical Excellence Through AI-Enhanced Development

This portfolio demonstrates capability through actual operating products and measurable results. References and detailed technical discussions available upon request.