CUSTOM SAAS DEVELOPMENT · カスタムSaaS開発

Japanese SaaS founders building for the domestic market need Japanese-language UI as the primary interface, JPY billing with convenience store payment support, and a formal data handling policy aligned to Japan's Act on the Protection of Personal Information: these are table-stakes for Japanese enterprise sales, not optional features.

Ignited Nepal designs and builds custom SaaS products for Japanese DX founders and international teams targeting Japan, with Japanese-language UI as the primary design target, Stripe Japan billing with コンビニ払い, and APPI compliance architecture built into the product from day one.

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This is for you if

Who This Is For

Japan's manufacturing, logistics, and construction sectors are among the most active DX investment areas under the government's Digital Agency initiative, with significant budget allocated to replacing paper-based workflows, kintone-based configurations, and Excel-heavy processes with purpose-built digital tools. If you are a domain expert in one of these industries who has identified a workflow that needs a product rather than a configuration, Ignited Nepal can take that domain knowledge and build a SaaS product around it with a Japanese-language UI, a multi-tenant architecture that supports multiple enterprise clients, and the compliance posture that Japanese enterprise procurement requires.

Japan's professional services sector — accounting firms, law offices, HR consulting firms, and labour management consultants — still manages significant client workflow in Excel, fax, and paper-based processes. A vertical SaaS product built for one of these professions and sold to the large market of Japanese SMEs has a clear customer acquisition path through professional associations and referral networks. The critical requirement is that the product speaks Japanese natively: not as a translation of an English product, but as a system designed from the beginning with Japanese form conventions, keigo (敬語) language in system messages and error states, and a UX that matches Japanese user expectations for information density and workflow structure.

Japan's e-commerce market is dominated by Rakuten, Amazon Japan, and Yahoo Shopping, and a SaaS product targeting Japanese online retailers needs to integrate with these platform APIs for order management, inventory synchronisation, and fulfilment workflow. If you are building a custom commerce management or inventory SaaS for the Japanese market, the integration architecture with these three platforms is a core product requirement, not a later phase. Ignited Nepal builds these integrations alongside the core product, not as a post-MVP addition.

International SaaS products that have proven product-market fit in English-speaking markets and are expanding into Japan frequently underestimate the technical depth of Japan-market localisation. Japanese UI is not a translation project; it is a re-design project. JPY billing with Stripe Japan, consumption tax display, and コンビニ払い integration require engineering work, not configuration. APPI compliance requires a data model review and privacy policy in Japanese. LINE integration for user notifications is near-mandatory for consumer-facing products. Ignited Nepal provides Japan-market localisation engineering for international SaaS products as a defined engagement scope.

What's broken

What Is Broken

Japanese-language UI built as an afterthought

SaaS products targeting the Japanese market that launch with English-first UI and add Japanese as a static string replacement fail to meet the actual UI requirements of Japanese users. Japanese UI is not a translation project. It requires a different approach to information density — Japanese users expect more information per screen than typical Western UI design accommodates. It requires different form field conventions — family name (姓) before given name (名), postal code format triggering automatic address lookup, furigana fields for kanji name reading required on registration forms for many Japanese enterprise contexts. It requires formal keigo (敬語) language register in system messages, error states, and onboarding copy — the difference between casual Japanese and formal Japanese in a business software context is not stylistic; it signals whether the product is appropriate for professional use. Japanese-language UI must be the primary design target from the first wireframe, not a localisation layer added to a completed English product.

JPY billing and convenience store payment not integrated

Japanese SaaS products that bill Japanese enterprise customers in USD and do not offer JPY invoicing are creating a procurement barrier. Japanese enterprise buyers expect JPY-denominated invoices with consumption tax (消費税, currently 10%) displayed as a separate line item, not embedded in the gross price. Japanese B2C SaaS products that do not offer convenience store payment (コンビニ払い) are excluding a payment method that a significant portion of Japanese consumers prefer and that competitors in the same market will offer. Stripe Japan supports JPY card billing and convenience store payment through the Stripe Konbini payment method. Not integrating JPY billing and コンビニ払い at MVP stage is a decision to accept a lower conversion rate from Japanese customers for as long as it takes to retrofit.

APPI compliance not built into the product

Japanese SaaS products handling personal data of Japanese users without APPI (個人情報の保護に関する法律) compliance architecture are not enterprise-ready for the Japanese market. APPI requires a published privacy policy (プライバシーポリシー) in Japanese describing the purposes of personal data processing, a data subject rights workflow allowing Japanese users to request disclosure, correction, or deletion of their personal data, a data handling purpose declaration covering every personal data category collected, and a security management measure (安全管理措置) document describing the technical and organisational measures protecting personal data. Japanese enterprise procurement teams conduct APPI compliance checks as a standard part of the vendor evaluation process. A SaaS product that cannot produce these documents does not advance past the procurement stage.

ISMAP certification not on the roadmap for government SaaS

Japanese SaaS founders building for government or quasi-government clients who are not aware of ISMAP, or who are aware of it but have not put it on their product roadmap, are building toward a procurement barrier they will encounter at the first government sales opportunity. ISMAP (政府情報システムのためのセキュリティ評価制度) is Japan's cloud security certification scheme for government procurement. Any SaaS product used by a Japanese government entity is expected to be ISMAP-listed or to have a credible ISMAP certification plan. The certification process involves a third-party assessment against a comprehensive security control framework and typically takes 6 to 12 months. A SaaS product targeting Japanese government clients needs ISMAP on the 12-to-18-month product roadmap from the first customer conversation in the government vertical, not from the first government contract.

What we engineer

What We Do

Japanese-first product scoping and UI design

Ignited Nepal's Japan-market SaaS engagements begin with a scoping session structured around the specific requirements of Japanese enterprise product adoption. This covers Japanese UI conventions, the form field structure required for Japanese personal data entry, the information architecture expected by Japanese B2B users, and the keigo language register required for system copy. The product wireframes are designed in Japanese from the first iteration. English is a secondary language track, not the primary design target. This distinction matters because retrofitting Japanese UI conventions onto an English-first product architecture is a redesign project, not a translation project.

Stripe Japan billing with JPY, consumption tax, and コンビニ払い

Billing for Japan-market SaaS products built by Ignited Nepal uses Stripe Japan with JPY as the primary billing currency. Consumption tax at 10% is configured as a separate line item on invoices, consistent with Japanese accounting practice and enterprise procurement requirements. For B2C products, Stripe Konbini payment is integrated to support convenience store payment, which is a standard payment option in the Japanese consumer market. Subscription plan structures, trial periods, and invoice templates are configured to meet Japanese enterprise invoicing conventions. The billing system is live and tested before the first customer is asked to pay.

APPI compliance architecture and Japanese privacy documentation

The data model for every Japan-market SaaS product built by Ignited Nepal is designed with APPI compliance as a structural requirement. This means a data subject rights workflow that handles 開示 (disclosure), 訂正 (correction), and 削除 (deletion) requests, a privacy policy in Japanese reviewed against current APPI requirements, a data handling purpose declaration for each personal data category, and a security management measure document. These documents are produced as part of the architecture phase, not as post-launch additions. They are the documents that Japanese enterprise procurement teams will request at the evaluation stage.

Multi-tenant architecture for Japanese enterprise deployment

Japanese enterprise SaaS deployment commonly requires strict data isolation between client organisations. The multi-tenant architecture for Japan-market products built by Ignited Nepal uses row-level security or schema-per-tenant isolation depending on the data sensitivity and compliance requirements of the product. Admin panel features include tenant management, usage monitoring, and support-facing data views. Enterprise clients in Japan frequently require the ability to export their own data in a defined format as a contract condition; this capability is scoped at the architecture stage.

LINE integration for user notifications

For consumer-facing Japanese SaaS products, LINE integration for user notifications is implemented as part of the core product build. LINE is Japan's dominant messaging platform and the expected channel for transactional notifications in consumer-facing Japanese digital products. LINE Notify or the LINE Messaging API is integrated depending on the notification use case. For B2B products targeting Japanese enterprise users, email notifications with Japanese-language templates are the primary channel, with LINE as an optional additional channel for high-priority alerts.

Cloud deployment with Japan or APAC data residency

Japan-market SaaS products are deployed on AWS ap-northeast-1 (Tokyo) or Google Cloud asia-northeast1 (Tokyo) by default, providing Japan data residency for products where Japanese data subject personal data is stored. Data residency in Japan is a preference rather than a legal requirement for most private-sector SaaS products, but it is a factor in Japanese enterprise supplier evaluation. CI/CD pipeline, automated testing, database backups, and monitoring are configured before the product is made available to Japanese users.

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What changes

What Changes

Before
After
Before SaaS products targeting the Japanese market that launch with English-first UI and add Japanese as a static string replacement fail to meet the actual UI requirements of Japanese users. Japanese UI is not a translation project. It requires a different approach to information density — Japanese users expect more information per screen than typical Western UI design accommodates. It requires different form field conventions — family name (姓) before given name (名), postal code format triggering automatic address lookup, furigana fields for kanji name reading required on registration forms for many Japanese enterprise contexts. It requires formal keigo (敬語) language register in system messages, error states, and onboarding copy — the difference between casual Japanese and formal Japanese in a business software context is not stylistic; it signals whether the product is appropriate for professional use. Japanese-language UI must be the primary design target from the first wireframe, not a localisation layer added to a completed English product.
After A SaaS product designed with Japanese-language UI as the primary interface from day one does not require a UI redesign project before it can be evaluated by Japanese enterprise procurement. The first Japanese enterprise prospect sees a product designed for them, not a product localised for them after the fact.
Before Japanese SaaS products that bill Japanese enterprise customers in USD and do not offer JPY invoicing are creating a procurement barrier. Japanese enterprise buyers expect JPY-denominated invoices with consumption tax (消費税, currently 10%) displayed as a separate line item, not embedded in the gross price. Japanese B2C SaaS products that do not offer convenience store payment (コンビニ払い) are excluding a payment method that a significant portion of Japanese consumers prefer and that competitors in the same market will offer. Stripe Japan supports JPY card billing and convenience store payment through the Stripe Konbini payment method. Not integrating JPY billing and コンビニ払い at MVP stage is a decision to accept a lower conversion rate from Japanese customers for as long as it takes to retrofit.
After Japanese B2C customers who encounter a SaaS product that bills only in USD and offers only card payment will convert at a lower rate than those encountering a product with JPY pricing and convenience store payment. Integrating these at MVP stage means the product competes on equal terms with Japanese market incumbents from the first customer.
Before Japanese SaaS products handling personal data of Japanese users without APPI (個人情報の保護に関する法律) compliance architecture are not enterprise-ready for the Japanese market. APPI requires a published privacy policy (プライバシーポリシー) in Japanese describing the purposes of personal data processing, a data subject rights workflow allowing Japanese users to request disclosure, correction, or deletion of their personal data, a data handling purpose declaration covering every personal data category collected, and a security management measure (安全管理措置) document describing the technical and organisational measures protecting personal data. Japanese enterprise procurement teams conduct APPI compliance checks as a standard part of the vendor evaluation process. A SaaS product that cannot produce these documents does not advance past the procurement stage.
After A SaaS product with a published Japanese-language privacy policy, a data subject rights workflow, and a security management measure document can respond to Japanese enterprise supplier questionnaires at the evaluation stage. Products without these documents do not advance past the initial procurement review regardless of the quality of the core product.
Before Japanese SaaS founders building for government or quasi-government clients who are not aware of ISMAP, or who are aware of it but have not put it on their product roadmap, are building toward a procurement barrier they will encounter at the first government sales opportunity. ISMAP (政府情報システムのためのセキュリティ評価制度) is Japan's cloud security certification scheme for government procurement. Any SaaS product used by a Japanese government entity is expected to be ISMAP-listed or to have a credible ISMAP certification plan. The certification process involves a third-party assessment against a comprehensive security control framework and typically takes 6 to 12 months. A SaaS product targeting Japanese government clients needs ISMAP on the 12-to-18-month product roadmap from the first customer conversation in the government vertical, not from the first government contract.
After A SaaS product that has ISMAP certification on a documented 12-to-18-month roadmap, with the architecture designed to support the security control framework, can have a credible government sales conversation. A product with no ISMAP plan cannot be placed on a government procurement shortlist regardless of its functional capabilities.
How it works

Process

  1. 01

    Japan-Market SaaS Scoping Session

    A structured session covering the product's target Japanese user, Japanese UI requirements, APPI data handling scope, ISMAP applicability, and JPY billing configuration. The output is a written scope document with acceptance criteria and a Japan-market compliance baseline.

  2. 02

    Japanese UI Design and Architecture

    Product wireframes designed in Japanese with correct form field conventions, information density, and keigo language register. The architecture document covers multi-tenancy, APPI data model requirements, and the LINE integration scope for consumer-facing products.

  3. 03

    Billing and Compliance Infrastructure

    Stripe Japan with JPY billing, consumption tax display, and コンビニ払い integrated and tested. APPI privacy policy and data subject rights workflow implemented. Security management measure document produced.

  4. 04

    Core Product Build

    The MVP feature set built sprint by sprint against the scoping acceptance criteria. Japanese-language UI primary throughout. Enterprise-facing features including data export, tenant management, and APPI subject rights workflow included in MVP scope.

  5. 05

    Production Deployment on AWS Tokyo

    Production deployment on AWS ap-northeast-1 (Tokyo) or GCP asia-northeast1 (Tokyo) with Japan data residency. CI/CD pipeline, database backups, monitoring, and alerting configured before go-live.

  6. 06

    Post-Launch Iteration and ISMAP Roadmap Support

    Sprint-based iteration support post-launch, covering feature additions from the post-MVP backlog, LINE notification expansion, and ISMAP pre-assessment planning for products targeting government clients.

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Common questions

Frequently asked questions about Custom SaaS Development

What are the Japanese-specific UI requirements for a SaaS product targeting the Japanese market?

Japanese SaaS products require five specific UI adaptations that go beyond translation: family name (姓) before given name (名) on all personal name fields, postal code entry that triggers automatic address population using the Japan Post API, furigana (フリガナ) fields for kanji name reading on registration and contract forms, keigo (敬語) formal language register in all system messages and error states, and higher information density per screen than typical Western SaaS UI design accommodates. Japanese enterprise users are accustomed to working with dense information displays in tools like kintone and SAP; a sparse Western-style UI is perceived as lacking functionality, not as clean design. The UI must be designed in Japanese from the first wireframe, not translated from English after the product is built.

How do I integrate JPY billing and convenience store payment (コンビニ払い) into a Japanese SaaS product using Stripe Japan?

Stripe Japan supports JPY billing for subscription and one-time payments and convenience store payment through the Stripe Konbini payment method. To integrate JPY billing, you create a Stripe account registered in Japan (or use a Japan-domiciled entity), set JPY as the default currency, and configure Stripe Tax with Japan consumption tax at 10% as an exclusive tax displayed as a separate line item on invoices. For コンビニ払い, you enable the konbini payment method type in your Stripe integration, which generates a payment code the customer uses to pay at a convenience store within the payment window (typically 3 to 5 days). Stripe handles the payment confirmation via webhook. The customer receives a payment instruction by email or in-app with the store name, payment code, and expiry. Stripe Japan's convenience store payment supports Seven-Eleven, FamilyMart, Lawson, and other major chains.

What does APPI compliance require for a SaaS product handling personal data of Japanese users?

APPI (個人情報の保護に関する法律, the Act on the Protection of Personal Information) requires four core compliance measures for a SaaS product handling personal data of Japanese users. First, a published privacy policy (プライバシーポリシー) in Japanese that states the business operator's name, the purposes for which personal data is used, the categories of personal data handled, the third parties with whom data is shared, and the procedure for data subject rights requests. Second, a data subject rights workflow that enables Japanese users to request 開示 (disclosure of their data), 訂正 (correction of inaccurate data), and 削除 (deletion of their data). Third, a data handling purpose declaration that limits the use of each personal data category to the declared purpose. Fourth, a security management measure (安全管理措置) document describing the technical and organisational measures used to protect personal data from unauthorised access, leakage, or loss. APPI compliance documentation is reviewed by Japanese enterprise procurement teams before a SaaS vendor contract is signed.

What is ISMAP and when does a Japanese SaaS product need it?

ISMAP (政府情報システムのためのセキュリティ評価制度) is Japan's cloud security certification scheme, administered by the Ministry of Digital Affairs, METI, MIC, and NPA, for SaaS products used in Japanese government information systems. ISMAP certification is required for any SaaS product that will be used by a Japanese national or local government entity. The certification process involves a third-party assessment against ISMAP's security control framework, which is modelled on ISO 27001 and NIST SP 800-53. The assessment and certification process typically takes 6 to 12 months and requires significant security control documentation and evidence. A SaaS product targeting Japanese government clients should begin ISMAP preparation 12 to 18 months before the first government contract is expected. Products that are not ISMAP-certified cannot be placed on government procurement lists; there is no exception for small or early-stage products.

How do I integrate LINE notifications into a Japanese SaaS product for user communication?

LINE integration for a Japanese SaaS product uses either LINE Notify (for simple push notification to a user's LINE account from a service account) or the LINE Messaging API (for full conversational and structured message capabilities). LINE Notify is simpler to integrate and appropriate for transactional notifications such as payment confirmations, appointment reminders, and alert messages. The user connects their LINE account to the SaaS product through a LINE Login OAuth flow, and the product sends notifications via the LINE Notify API. The LINE Messaging API supports richer message formats including carousels, buttons, and flex messages, and is appropriate for products where the notification experience is a significant part of the product's value. Both integrations require a LINE Business ID and approval of the channel type in the LINE Developers Console. For consumer-facing Japanese SaaS products, LINE notification is expected by users as the primary notification channel; email is a secondary channel.

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Closing CTA

Japanese DX founders and international teams targeting Japan who are planning a SaaS product or are early in development can book a Japan-market SaaS scoping session with the Ignited Nepal team. The scoping session covers Japanese UI requirements, APPI compliance architecture, Stripe Japan billing configuration, and ISMAP applicability for your product category. The output is a written architecture brief and a cost and timeline estimate for your MVP. There is no commitment beyond the session itself.

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