{"id":4561,"date":"2026-07-01T13:59:45","date_gmt":"2026-07-01T04:59:45","guid":{"rendered":"https:\/\/smilesoftware.org\/?p=4561"},"modified":"2026-07-01T13:59:47","modified_gmt":"2026-07-01T04:59:47","slug":"%e3%83%aa%e3%83%93%e3%83%ab%e3%83%89%e9%96%8b%e7%99%ba%e4%ba%8b%e4%be%8b","status":"publish","type":"post","link":"https:\/\/smilesoftware.org\/en\/%E3%83%AA%E3%83%93%E3%83%AB%E3%83%89%E9%96%8B%E7%99%BA%E4%BA%8B%E4%BE%8B\/","title":{"rendered":"Rebuild development case study"},"content":{"rendered":"<div class=\"wp-block-group smile-post-content\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<header class=\"smile-article-header\"><div><span class=\"smile-category-pill\">Blog<\/span><span class=\"smile-date\">2026.06.25<\/span><\/div><h1 class=\"smile-article-title\">Rebuild development case study<\/h1><p class=\"smile-excerpt\"><\/p><\/header>\n<nav class=\"smile-toc\" aria-label=\"Table of Contents\"><h2 class=\"smile-toc__title\">Table of Contents<\/h2><div class=\"smile-toc__grid\"><a class=\"smile-toc__item\" href=\"#section-1\"><b class=\"smile-toc__number\">01<\/b><span class=\"smile-toc__label\">Introduction<\/span><\/a><a class=\"smile-toc__item\" href=\"#section-2\"><b class=\"smile-toc__number\">02<\/b><span class=\"smile-toc__label\">Fundamental issues in legacy systems<\/span><\/a><a class=\"smile-toc__item\" href=\"#section-3\"><b class=\"smile-toc__number\">03<\/b><span class=\"smile-toc__label\">Why Choose Rebuild Development Instead of Scratch Development?<\/span><\/a><a class=\"smile-toc__item\" href=\"#section-4\"><b class=\"smile-toc__number\">04<\/b><span class=\"smile-toc__label\">Case study overview<\/span><\/a><a class=\"smile-toc__item\" href=\"#section-5\"><b class=\"smile-toc__number\">05<\/b><span class=\"smile-toc__label\">How to proceed with rebuild development<\/span><\/a><a class=\"smile-toc__item\" href=\"#section-6\"><b class=\"smile-toc__number\">06<\/b><span class=\"smile-toc__label\">Results after implementation<\/span><\/a><a class=\"smile-toc__item\" href=\"#section-7\"><b class=\"smile-toc__number\">07<\/b><span class=\"smile-toc__label\">Key points for successful rebuild development<\/span><\/a><a class=\"smile-toc__item\" href=\"#section-8\"><b class=\"smile-toc__number\">08<\/b><span class=\"smile-toc__label\">About SMILE<\/span><\/a><a class=\"smile-toc__item\" href=\"#section-9\"><b class=\"smile-toc__number\">09<\/b><span class=\"smile-toc__label\">Summary<\/span><\/a><\/div><\/nav>\n\n<div id=\"section-1\" class=\"wp-block-group smile-section\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"smile-section__head\"><div class=\"smile-section__number\">01<\/div><h2 class=\"smile-section__title\">Introduction<\/h2><\/div>\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1288\" height=\"860\" src=\"https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image2-2.png\" alt=\"\u30ea\u30d3\u30eb\u30c9\u958b\u767a\u4e8b\u4f8b\" class=\"wp-image-4553\" srcset=\"https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image2-2.png 1288w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image2-2-300x200.png 300w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image2-2-1024x684.png 1024w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image2-2-768x513.png 768w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image2-2-18x12.png 18w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image2-2-930x620.png 930w\" sizes=\"auto, (max-width: 1288px) 100vw, 1288px\" \/><\/figure>\n\n\n<p>In many companies, legacy systems that have been repeatedly modified over many years still play a central role in business operations. However, as the business environment changes and technology advances, these systems are increasingly becoming obstacles to business growth.<\/p>\n\n\n<p>This article introduces the effectiveness and key success factors of rebuild development through a case study of reconstructing a system while leveraging existing assets.<\/p>\n\n<\/div><\/div>\n\n\n<div id=\"section-2\" class=\"wp-block-group smile-section\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"smile-section__head\"><div class=\"smile-section__number\">02<\/div><h2 class=\"smile-section__title\">Fundamental issues in legacy systems<\/h2><\/div>\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1288\" height=\"860\" src=\"https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image6.png\" alt=\"\u30ea\u30d3\u30eb\u30c9\u958b\u767a\u4e8b\u4f8b\" class=\"wp-image-4557\" srcset=\"https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image6.png 1288w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image6-300x200.png 300w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image6-1024x684.png 1024w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image6-768x513.png 768w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image6-18x12.png 18w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image6-930x620.png 930w\" sizes=\"auto, (max-width: 1288px) 100vw, 1288px\" \/><\/figure>\n\n\n<p>Many legacy systems face the following challenges.<\/p>\n\n\n<ul class=\"wp-block-list smile-bullet-list\"><li>The original design concept no longer aligns with the current business model.<\/li><li>Ad hoc modifications have accumulated each time business processes changed<\/li><li>Source code and specifications are not sufficiently available<\/li><li>A black-box system understood only by specific staff members<\/li><li>Difficult to integrate with new technologies and external services<\/li><\/ul>\n\n\n<p>These issues go beyond technical debt and develop into management risks that hinder business growth.<\/p>\n\n<\/div><\/div>\n\n\n<div id=\"section-3\" class=\"wp-block-group smile-section\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"smile-section__head\"><div class=\"smile-section__number\">03<\/div><h2 class=\"smile-section__title\">Why Choose Rebuild Development Instead of Scratch Development?<\/h2><\/div>\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1290\" height=\"860\" src=\"https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image1-2.png\" alt=\"\u30ea\u30d3\u30eb\u30c9\u958b\u767a\u4e8b\u4f8b\" class=\"wp-image-4552\" srcset=\"https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image1-2.png 1290w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image1-2-300x200.png 300w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image1-2-1024x683.png 1024w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image1-2-768x512.png 768w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image1-2-18x12.png 18w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image1-2-930x620.png 930w\" sizes=\"auto, (max-width: 1290px) 100vw, 1290px\" \/><\/figure>\n\n\n<p>When considering legacy system renewal, many companies assume they need scratch development, rebuilding everything from the ground up.<\/p>\n\n\n<p>However, scratch development involves the following risks.<\/p>\n\n\n<ul class=\"wp-block-list smile-bullet-list\"><li>Missed requirements due to insufficient business understanding<\/li><li>Longer time to completion<\/li><li>Significant business impact during migration<\/li><li>Risk of building a system that frontline users will not accept<\/li><\/ul>\n\n<\/div><\/div>\n\n\n<div id=\"section-4\" class=\"wp-block-group smile-section\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"smile-section__head\"><div class=\"smile-section__number\">04<\/div><h2 class=\"smile-section__title\">Case study overview<\/h2><\/div>\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1290\" height=\"860\" src=\"https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image7.png\" alt=\"\u30ea\u30d3\u30eb\u30c9\u958b\u767a\u4e8b\u4f8b\" class=\"wp-image-4558\" srcset=\"https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image7.png 1290w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image7-300x200.png 300w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image7-1024x683.png 1024w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image7-768x512.png 768w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image7-18x12.png 18w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image7-930x620.png 930w\" sizes=\"auto, (max-width: 1290px) 100vw, 1290px\" \/><\/figure>\n\n\n<p>Industry: BtoB services<\/p>\n\n\n<p>Target system<\/p>\n\n\n<ul class=\"wp-block-list smile-bullet-list\"><li>Customer relationship management (CRM)<\/li><li>Order and procurement management<\/li><li>Billing and sales management<\/li><\/ul>\n\n\n<p>Existing challenges<\/p>\n\n\n<ul class=\"wp-block-list smile-bullet-list\"><li>More than 10 years have passed since the system was built<\/li><li>Gaps between business workflows and system specifications<\/li><li>A situation where adding features takes several months<\/li><\/ul>\n\n<\/div><\/div>\n\n\n<div id=\"section-5\" class=\"wp-block-group smile-section\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"smile-section__head\"><div class=\"smile-section__number\">05<\/div><h2 class=\"smile-section__title\">How to proceed with rebuild development<\/h2><\/div>\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1136\" height=\"764\" src=\"https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image3-2.png\" alt=\"\u30ea\u30d3\u30eb\u30c9\u958b\u767a\u4e8b\u4f8b\" class=\"wp-image-4554\" srcset=\"https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image3-2.png 1136w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image3-2-300x202.png 300w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image3-2-1024x689.png 1024w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image3-2-768x517.png 768w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image3-2-18x12.png 18w\" sizes=\"auto, (max-width: 1136px) 100vw, 1136px\" \/><\/figure>\n\n<div class=\"smile-insight-cards\"><div class=\"smile-insight-card\"><div class=\"smile-insight-card__head\"><span class=\"smile-insight-card__icon\" aria-hidden=\"true\"><svg class=\"smile-ui-icon smile-ui-icon--document\" viewbox=\"0 0 64 64\" aria-hidden=\"true\" focusable=\"false\" stroke=\"currentColor\"><path d=\"M18 8h20l10 10v38H18z\"\/><path d=\"M38 8v12h10\"\/><path d=\"M24 32h18\"\/><path d=\"M24 42h18\"\/><path d=\"M24 22h8\"\/><\/svg><\/span><h3 class=\"smile-insight-card__title\">\u2460 Thorough Visualization of Current Operations and Systems<\/h3><\/div><p>The first step was to understand the business operations, not the system.<\/p><ul class=\"smile-bullet-list\"><li>Interviews with frontline staff<\/li><li>Creating actual business process flow diagrams<\/li><li>Inventory of existing functions<\/li><li>Clarifying usage frequency and business criticality<\/li><\/ul><p>This process clarified the following two points.<\/p><ul class=\"smile-bullet-list\"><li>Features that exist in the system but are not actually used<\/li><li>Processes handled through person-dependent operations<\/li><\/ul><\/div><div class=\"smile-insight-card\"><div class=\"smile-insight-card__head\"><span class=\"smile-insight-card__icon\" aria-hidden=\"true\"><svg class=\"smile-ui-icon smile-ui-icon--operations\" viewbox=\"0 0 64 64\" aria-hidden=\"true\" focusable=\"false\" stroke=\"currentColor\"><circle cx=\"32\" cy=\"32\" r=\"9\"\/><path d=\"M32 8v8\"\/><path d=\"M32 48v8\"\/><path d=\"m15 15 6 6\"\/><path d=\"m43 43 6 6\"\/><path d=\"M8 32h8\"\/><path d=\"M48 32h8\"\/><path d=\"m15 49 6-6\"\/><path d=\"m43 21 6-6\"\/><\/svg><\/span><h3 class=\"smile-insight-card__title\">\u2461 Future-Oriented Redesign<\/h3><\/div><p>In rebuild development, we do more than simply recreate existing features. We design with business expansion over the next three to five years in mind.<\/p><ul class=\"smile-bullet-list\"><li>Module division by business unit<\/li><li>Separation of frontend and backend<\/li><li>API-First Design<\/li><li>An architecture designed for cloud migration<\/li><\/ul><p>This created a foundation that can flexibly support future<\/p><ul class=\"smile-bullet-list\"><li>Adding new services<\/li><li>Integration with external SaaS platforms<\/li><li>Support for overseas locations<\/li><\/ul><p>as well.<\/p><\/div><div class=\"smile-insight-card\"><div class=\"smile-insight-card__head\"><span class=\"smile-insight-card__icon\" aria-hidden=\"true\"><svg class=\"smile-ui-icon smile-ui-icon--flexibility\" viewbox=\"0 0 64 64\" aria-hidden=\"true\" focusable=\"false\" stroke=\"currentColor\"><path d=\"M14 32h26\"\/><path d=\"m32 22 10 10-10 10\"\/><path d=\"M50 18v28\"\/><path d=\"M14 18v28\"\/><\/svg><\/span><h3 class=\"smile-insight-card__title\">\u2462 Phased Rebuild through Agile Development<\/h3><\/div><p>In this case, we adopted agile development and rebuilt the system in stages.<\/p><ul class=\"smile-bullet-list\"><li>Start with features that have minimal business impact<\/li><li>Parallel operation with the existing system<\/li><li>Regular reviews and improvements<\/li><li>Adjusting requirements as needed<\/li><\/ul><p>By migrating in phases instead of switching everything at once, we were able to minimize the risk of business disruption.<\/p><\/div><\/div>\n<\/div><\/div>\n\n\n<div id=\"section-6\" class=\"wp-block-group smile-section\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"smile-section__head\"><div class=\"smile-section__number\">06<\/div><h2 class=\"smile-section__title\">Results after implementation<\/h2><\/div>\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1321\" height=\"860\" src=\"https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image8.png\" alt=\"\u30ea\u30d3\u30eb\u30c9\u958b\u767a\u4e8b\u4f8b\" class=\"wp-image-4559\" srcset=\"https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image8.png 1321w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image8-300x195.png 300w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image8-1024x667.png 1024w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image8-768x500.png 768w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image8-18x12.png 18w\" sizes=\"auto, (max-width: 1321px) 100vw, 1321px\" \/><\/figure>\n\n\n<p>After the rebuild development was completed, the following results were achieved.<\/p>\n\n\n<ul class=\"wp-block-list smile-bullet-list\"><li>Development speed: improved by approximately 40% compared with the previous approach<\/li><li>Major reduction in maintenance and operating costs<\/li><li>The impact scope is clarified when new features are added<\/li><li>Eliminating dependence on specific individuals<\/li><li>Create an environment where business improvement proposals are easier to make<\/li><\/ul>\n\n\n<p>A major achievement was that the perception of \u201csystem changes = major risk\u201d faded, and a continuous cycle of business improvement began.<\/p>\n\n<\/div><\/div>\n\n\n<div id=\"section-7\" class=\"wp-block-group smile-section\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"smile-section__head\"><div class=\"smile-section__number\">07<\/div><h2 class=\"smile-section__title\">Key points for successful rebuild development<\/h2><\/div>\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1288\" height=\"860\" src=\"https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image4-2.png\" alt=\"\u30ea\u30d3\u30eb\u30c9\u958b\u767a\u4e8b\u4f8b\" class=\"wp-image-4555\" srcset=\"https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image4-2.png 1288w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image4-2-300x200.png 300w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image4-2-1024x684.png 1024w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image4-2-768x513.png 768w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image4-2-18x12.png 18w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image4-2-930x620.png 930w\" sizes=\"auto, (max-width: 1288px) 100vw, 1288px\" \/><\/figure>\n\n<div class=\"smile-insight-cards\"><div class=\"smile-insight-card\"><div class=\"smile-insight-card__head\"><span class=\"smile-insight-card__icon\" aria-hidden=\"true\"><svg class=\"smile-ui-icon smile-ui-icon--operations\" viewbox=\"0 0 64 64\" aria-hidden=\"true\" focusable=\"false\" stroke=\"currentColor\"><circle cx=\"32\" cy=\"32\" r=\"9\"\/><path d=\"M32 8v8\"\/><path d=\"M32 48v8\"\/><path d=\"m15 15 6 6\"\/><path d=\"m43 43 6 6\"\/><path d=\"M8 32h8\"\/><path d=\"M48 32h8\"\/><path d=\"m15 49 6-6\"\/><path d=\"m43 21 6-6\"\/><\/svg><\/span><h3 class=\"smile-insight-card__title\">\u2460 Project Managers with Industry Expertise<\/h3><\/div><p>With PMs who thoroughly understand your business and industry leading the requirements definition, we ensure a development process where \"building the system\" doesn't just become an end in itself.<\/p><\/div><div class=\"smile-insight-card\"><div class=\"smile-insight-card__head\"><span class=\"smile-insight-card__icon\" aria-hidden=\"true\"><svg class=\"smile-ui-icon smile-ui-icon--flexibility\" viewbox=\"0 0 64 64\" aria-hidden=\"true\" focusable=\"false\" stroke=\"currentColor\"><path d=\"M14 32h26\"\/><path d=\"m32 22 10 10-10 10\"\/><path d=\"M50 18v28\"\/><path d=\"M14 18v28\"\/><\/svg><\/span><h3 class=\"smile-insight-card__title\">\u2461 Prioritizing Business Operations over Technology<\/h3><\/div><p>It is more important to focus on a design that fits the business than on adopting the latest technologies.<\/p><\/div><div class=\"smile-insight-card\"><div class=\"smile-insight-card__head\"><span class=\"smile-insight-card__icon\" aria-hidden=\"true\"><svg class=\"smile-ui-icon smile-ui-icon--cost\" viewbox=\"0 0 64 64\" aria-hidden=\"true\" focusable=\"false\" stroke=\"currentColor\"><circle cx=\"32\" cy=\"32\" r=\"20\"\/><path d=\"M32 18v28\"\/><path d=\"M40 24c-2-4-14-5-16 1-3 8 17 5 14 14-2 6-14 5-17 0\"\/><\/svg><\/span><h3 class=\"smile-insight-card__title\">\u2462 Build Small and Use Quickly<\/h3><\/div><p>The key to success is not aiming for perfection, but first creating something usable and improving it over time.<\/p><\/div><\/div>\n<\/div><\/div>\n\n\n<div id=\"section-8\" class=\"wp-block-group smile-section\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"smile-section__head\"><div class=\"smile-section__number\">08<\/div><h2 class=\"smile-section__title\">About SMILE<\/h2><\/div>\n<p>SMILE is a software development company with development bases in Japan and Vietnam. In addition to end-to-end system development, we specialize in legacy system modernization and rebuild development, supporting many BtoB companies.<\/p><p>SMILE is more than a development vendor. We work closely with customers as a partner that starts by understanding their business operations and then redesigns both operations and IT.<\/p><h3 class=\"wp-block-heading smile-group-heading\">SMILE\u2019s Strengths<\/h3><div class=\"smile-insight-cards smile-insight-cards--four\"><div class=\"smile-insight-card\"><div class=\"smile-insight-card__head\"><span class=\"smile-insight-card__icon\" aria-hidden=\"true\"><svg class=\"smile-ui-icon smile-ui-icon--operations\" viewbox=\"0 0 64 64\" aria-hidden=\"true\" focusable=\"false\" stroke=\"currentColor\"><circle cx=\"32\" cy=\"32\" r=\"9\"\/><path d=\"M32 8v8\"\/><path d=\"M32 48v8\"\/><path d=\"m15 15 6 6\"\/><path d=\"m43 43 6 6\"\/><path d=\"M8 32h8\"\/><path d=\"M48 32h8\"\/><path d=\"m15 49 6-6\"\/><path d=\"m43 21 6-6\"\/><\/svg><\/span><h3 class=\"smile-insight-card__title\">Drive projects based on industry and business understanding<\/h3><\/div><p>A PM with deep knowledge of industry characteristics and business workflows leads requirements definition and delivers system designs aligned with actual operations.<\/p><\/div><div class=\"smile-insight-card\"><div class=\"smile-insight-card__head\"><span class=\"smile-insight-card__icon\" aria-hidden=\"true\"><svg class=\"smile-ui-icon smile-ui-icon--replace\" viewbox=\"0 0 64 64\" aria-hidden=\"true\" focusable=\"false\" stroke=\"currentColor\"><path d=\"M14 18h22v16H14z\"\/><path d=\"M28 30h22v16H28z\"\/><path d=\"m42 16 8 8-8 8\"\/><path d=\"M34 24h16\"\/><\/svg><\/span><h3 class=\"smile-insight-card__title\">Extensive experience in rebuild development and modernization<\/h3><\/div><ul class=\"smile-bullet-list\"><li>Current-state analysis of legacy systems<\/li><li>Visualization of business operations and functions<\/li><li>Redesign with future expansion in mind<\/li><li>Phased rebuild and migration support<\/li><\/ul><p>We build sustainable systems that make maximum use of existing assets.<\/p><\/div><div class=\"smile-insight-card\"><div class=\"smile-insight-card__head\"><span class=\"smile-insight-card__icon\" aria-hidden=\"true\"><svg class=\"smile-ui-icon smile-ui-icon--flexibility\" viewbox=\"0 0 64 64\" aria-hidden=\"true\" focusable=\"false\" stroke=\"currentColor\"><path d=\"M14 32h26\"\/><path d=\"m32 22 10 10-10 10\"\/><path d=\"M50 18v28\"\/><path d=\"M14 18v28\"\/><\/svg><\/span><h3 class=\"smile-insight-card__title\">A flexible development approach combining Agile and Waterfall<\/h3><\/div><ul class=\"smile-bullet-list\"><li>Reduce migration risk<\/li><li>Stabilizing quality and schedules<\/li><li>Flexible response to requirement changes<\/li><\/ul><\/div><div class=\"smile-insight-card\"><div class=\"smile-insight-card__head\"><span class=\"smile-insight-card__icon\" aria-hidden=\"true\"><svg class=\"smile-ui-icon smile-ui-icon--cost\" viewbox=\"0 0 64 64\" aria-hidden=\"true\" focusable=\"false\" stroke=\"currentColor\"><circle cx=\"32\" cy=\"32\" r=\"20\"\/><path d=\"M32 18v28\"\/><path d=\"M40 24c-2-4-14-5-16 1-3 8 17 5 14 14-2 6-14 5-17 0\"\/><\/svg><\/span><h3 class=\"smile-insight-card__title\">Japan \u00d7 Vietnam development structure<\/h3><\/div><ul class=\"smile-bullet-list\"><li>Smooth communication with Japanese companies<\/li><li>Development that ensures Japanese-level quality<\/li><li>High cost performance<\/li><\/ul><\/div><\/div>\n<\/div><\/div>\n\n\n<div id=\"section-9\" class=\"wp-block-group smile-section\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"smile-section__head\"><div class=\"smile-section__number\">09<\/div><h2 class=\"smile-section__title\">Summary<\/h2><\/div>\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1293\" height=\"860\" src=\"https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image5.png\" alt=\"\u30ea\u30d3\u30eb\u30c9\u958b\u767a\u4e8b\u4f8b\" class=\"wp-image-4556\" srcset=\"https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image5.png 1293w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image5-300x200.png 300w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image5-1024x681.png 1024w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image5-768x511.png 768w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image5-18x12.png 18w, https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-image5-930x620.png 930w\" sizes=\"auto, (max-width: 1293px) 100vw, 1293px\" \/><\/figure>\n\n\n<p>Rebuild development is more than a system renewal. It is an initiative to review business operations, organization, and IT, then redesign the foundation for the future.<\/p>\n\n\n<p>SMILE helps customers build an IT foundation that supports sustainable growth through a phased and practical rebuild approach, while respecting their current operations and existing assets.<\/p>\n\n<\/div><\/div>\n\n<section class=\"smile-article-cta\"><div class=\"smile-article-cta__label\">SMILE Support<\/div><h2>Start a Consultation on Advancing GX and DX<\/h2><p>We work with you to design an approach tailored to your company\u2019s situation, from assessing the current state to implementing systems and improving operations.<\/p><ul class=\"smile-list\"><li>You can clarify current operational and data-related challenges.<\/li><li>You can design implementation steps that fit your company's structure.<\/li><li>You can also build a framework that remains easy to operate after implementation.<\/li><li>You can use data to verify results and make improvements.<\/li><\/ul><a class=\"smile-article-cta__button\" href=\"\/en\/contact\/\">Contact Us<\/a><\/section>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>In many companies, legacy systems that have been repeatedly modified over many years\u2026&nbsp;<a href=\"https:\/\/smilesoftware.org\/en\/%E3%83%AA%E3%83%93%E3%83%AB%E3%83%89%E9%96%8B%E7%99%BA%E4%BA%8B%E4%BE%8B\/\" class=\"\" rel=\"bookmark\">Read More &raquo;<span class=\"screen-reader-text\">Rebuild development case study<\/span><\/a><\/p>","protected":false},"author":2,"featured_media":4560,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"_themeisle_gutenberg_block_has_review":false,"_ti_tpc_template_sync":false,"_ti_tpc_template_id":"","footnotes":""},"categories":[32],"tags":[],"class_list":["post-4561","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"rttpg_featured_image_url":{"full":["https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-featured-imagegen.png",1672,941,false],"landscape":["https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-featured-imagegen.png",1672,941,false],"portraits":["https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-featured-imagegen.png",1672,941,false],"thumbnail":["https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-featured-imagegen-150x150.png",150,150,true],"medium":["https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-featured-imagegen-300x169.png",300,169,true],"large":["https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-featured-imagegen-1024x576.png",1024,576,true],"1536x1536":["https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-featured-imagegen-1536x864.png",1536,864,true],"2048x2048":["https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-featured-imagegen.png",1672,941,false],"trp-custom-language-flag":["https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-featured-imagegen-18x10.png",18,10,true],"neve-blog":["https:\/\/smilesoftware.org\/wp-content\/uploads\/2026\/06\/redmine-1302-featured-imagegen-930x620.png",930,620,true]},"rttpg_author":{"display_name":"\u7b20\u539f \u840c","author_link":"https:\/\/smilesoftware.org\/en\/author\/chinh-man\/"},"rttpg_comment":0,"rttpg_category":"<a href=\"https:\/\/smilesoftware.org\/en\/category\/blog\/\" rel=\"category tag\">\u30d6\u30ed\u30b0<\/a>","rttpg_excerpt":"\u591a\u304f\u306e\u4f01\u696d\u3067\u306f\u3001\u9577\u5e74\u306b\u308f\u305f\u308a\u6539\u4fee\u3092\u7e70\u308a\u8fd4\u3057\u3066\u304d\u305f\u30ec\u30ac\u30b7\u30fc\u30b7\u30b9&hellip;&nbsp;Read More &&hellip;","_links":{"self":[{"href":"https:\/\/smilesoftware.org\/en\/wp-json\/wp\/v2\/posts\/4561","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/smilesoftware.org\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/smilesoftware.org\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/smilesoftware.org\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/smilesoftware.org\/en\/wp-json\/wp\/v2\/comments?post=4561"}],"version-history":[{"count":1,"href":"https:\/\/smilesoftware.org\/en\/wp-json\/wp\/v2\/posts\/4561\/revisions"}],"predecessor-version":[{"id":4580,"href":"https:\/\/smilesoftware.org\/en\/wp-json\/wp\/v2\/posts\/4561\/revisions\/4580"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/smilesoftware.org\/en\/wp-json\/wp\/v2\/media\/4560"}],"wp:attachment":[{"href":"https:\/\/smilesoftware.org\/en\/wp-json\/wp\/v2\/media?parent=4561"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/smilesoftware.org\/en\/wp-json\/wp\/v2\/categories?post=4561"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/smilesoftware.org\/en\/wp-json\/wp\/v2\/tags?post=4561"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}