Web Development Company in Tokyo

How much commerce and identity machinery sits behind the pages is the real driver: a scoped Japanese-language marketing or brand site at Tokyo rates, a custom Next.js or Nuxt commerce platform with PayPay, Rakuten Pay, LINE Pay, and konbini payment integration, or full enterprise web platforms with MyNumber Card integration, multi-region deployment on AWS Tokyo plus Osaka DR, e-Tax connectivity, and Japan-headquartered SLAs. Scope drivers include Japanese typography setup, APPI consent flows, basic JIS X 8341 accessibility, and a native-editor copy pass. Tokyo rates sit above Osaka and Fukuoka because of the Rakuten, Mercari, Recruit, and CyberAgent talent premium. Fixed-fee proposals tied to milestones, not open T and M.

Japanese typography is its own engineering surface. We use CSS writing-mode vertical-rl for editorial and long-form pieces where the client expects tategaki (vertical layout), with text-orientation tuned for mixed Latin-kanji runs. Ruby annotations for furigana use the native HTML ruby, rt, and rp elements with CSS ruby-position styling, and we pre-build furigana from a kanji-reading dictionary (we use the JMdict or Sudachi dictionaries) rather than asking editors to type ruby tags manually. Kinsoku shori line-breaking rules are enforced so closing brackets, sokuon, and punctuation do not start a line. Font payloads use JIS Level 1 and 2 kanji subsets (about 6,355 characters) with on-demand loading for Level 3 and 4 rare kanji, keeping initial download manageable on mobile. Latin-kana kerning is tuned per font.

The Qualified Invoice System (tekikaku seikyusho hokanhoushiki) took effect October 1, 2023 under amendments to the Consumption Tax Act. Any business that wants to claim input consumption tax (shiire-zei) credit must obtain qualified invoices from registered issuers. For your website this means three things. First, B2B billing surfaces must display the issuer's invoice registration number (T plus 13 digits), tax-rate-separated subtotals (8 percent reduced rate vs 10 percent standard), and consumption tax amounts in the prescribed format. Second, vendor onboarding flows for marketplaces and multi-tenant platforms must capture and validate registration numbers via the National Tax Agency's public lookup API. Third, archived invoices must be retained per the Electronic Books Preservation Act (denshi chobo hozonhou) which was also strengthened in 2024. We ship the registration-number lookup, the format-compliant PDF and screen rendering, and the retention schedule as a standard module for any B2B Japanese build.

Yes. MyNumber Card (kojin bango kado) is Japan's national digital identity card, with roughly 80 percent issuance penetration as of 2024. The card holds a JPKI (Japan Public Key Infrastructure) signing certificate and an identification certificate, accessible from the device via NFC and a four-digit PIN. We integrate MyNumber via the JPKI middleware (now mostly via the Mynaportal API and the Digital Agency's MyNumber Card SDK for web), supporting login flows for e-Tax, Mynaportal-linked services, and any private-sector application that opts into the public identity rail. Common use cases include tax filing services, social-benefit application portals, healthcare receipt aggregation, and KYC for fintechs that want to avoid the friction of legacy zairyu-card or driver-license OCR. We handle the JPKI signature verification, the device-flow handoff to the official MyNumber app, and the consent disclosure required under APPI.

Japan's Act on Protection of Personal Information was substantially amended in April 2022 and now sits much closer to GDPR than before, but with Japan-specific wrinkles. Breach notification is mandatory to the PPC and affected individuals for incidents involving sensitive personal information, illegal acts, or more than 1,000 individuals, with prompt notification expected. Cross-border transfer rules require either adequacy (the EU has reciprocal adequacy with Japan, and the UK does too), informed consent, or contractual safeguards equivalent to APPI. Anonymously processed information (tokumei kako joho) and pseudonymously processed information are distinct legal categories with their own handling rules. Sensitive personal information (yo-hairyo kojin joho) includes race, creed, social status, medical history, criminal record, and victim status, and requires explicit consent. Our APPI pipeline covers consent UI, the privacy policy template, the data subject rights process, the cross-border disclosure ledger, and the PPC notification runbook.

Yes. JIS X 8341-3:2016 is Japan's national web accessibility standard, harmonised with WCAG 2.0 and largely compatible with WCAG 2.1 AA. It is mandatory for central government sites under Digital Agency direction, increasingly required for prefectural and municipal tenders, and adopted by major Japanese enterprises as a CSR baseline. We test with PC-Talker and NVDA Japanese builds, the miChecker tool maintained by the Ministry of Internal Affairs and Communications (MIC), and manual keyboard navigation in Japanese IME mode (which has accessibility quirks not present in English-locale testing). Deliverables for public-tender work include the MIC-format conformance report, a heuristic evaluation aligned with JIS X 8341-3, and screen-reader walkthrough recordings. We also handle furigana toggles and kanji reading aids where the audience includes children, accessibility-first users, or learners.

A typical mid-market Japanese storefront takes sixteen to twenty-two weeks from kickoff to go-live, assuming product data and supplier contracts exist. Week 1 to 3 covers APPI scoping, Qualified Invoice System review, payment-PG selection across PayPay, Rakuten Pay, LINE Pay, Amazon Pay Japan and konbini, and JIS X 8341 target setting. Week 4 to 11 is build, with Japanese payment integration and Yamato or Japan Post shipping API certification often on the critical path. Week 12 to 16 is QA on Docomo, KDDI au, SoftBank, and Rakuten Mobile networks, native-editor copy review for Japanese tone, yakkihou and keihinhyoji-hou disclosure verification, and Qualified Invoice format testing. Week 17 to 20 covers shadow launch, real-user monitoring, and integration with Japan Post return-shipping flows. Add four to six weeks if MyNumber Card auth, e-Tax integration, or Digital Agency design-system conformance is in scope.

It is not a translation problem and it is not legacy carelessness. Japanese web density is a deliberate UX tradition shaped by three forces. First, kanji compress meaning per square pixel far more efficiently than Latin script, so a sidebar that looks visually busy in English actually scans quickly in Japanese. Second, Japanese commerce buyers expect explicit category trees, shipping cost, return policy, and yakkihou disclosure above the fold; minimalist hero sections read as untrustworthy. Third, the dominant local benchmarks (Rakuten Ichiba, Yahoo Shopping, Kakaku.com, Tabelog, Hot Pepper) shaped a generation of user expectation toward dense portals. We do not impose Western minimalism on Japanese sites. We use Japanese density patterns where they fit the audience (commerce, B2B, recruitment, real estate, news), and we reserve Western whitespace for premium brand, design, and global-facing properties where the audience expects it.