"Insourcing" Articles (7)

Running Business Apps in Your Own Cloud Tenant: Access, Data Location, and Personal Data

If you are dropping a SaaS product and building the business app yourself, my view is that it usually runs better inside your own cloud environment, your own tenant. The fifth and final article in this series covers how that differs from multi-tenant SaaS, what you gain in identity, access, data integration, and audit logs, why "who can touch the data" rather than where it sits decides whether Japan's APPI treats a vendor as an entrusted party, why choosing a Tokyo region does not remove the duty to understand foreign rules, and how operational responsibility shifts to you. It draws on NIST, AWS, the Japanese Personal Information Protection Commission's Q&A and the 2026 APPI amendment, and ISO/IEC 27001.

2026-09-29Ryuta Hamamoto

WARP

How to Cancel a SaaS and Migrate Off It: Notice Deadlines, Data Export, and Parallel Runs

Once you decide to cancel a SaaS and build the replacement in-house, plan backward from the renewal date. This article covers the notice deadline for stopping auto-renewal, the clause that re-prices a renewal when you cut seats, the 30-day window to export data after termination, narrowing what you migrate, and deciding in advance when a parallel run ends. It draws on guidance from Japan's IPA, the Japan Fair Trade Commission, the Digital Agency's DS-310, the Japanese Civil Code on standard terms, and the EU Data Act, and ends with a schedule worked back from the renewal date.

2026-09-29Ryuta Hamamoto

WARP

Should You Cancel Your Expensive SaaS and Build It Yourself? Seven Tests for the AI Era

For IT heads, corporate planning teams, and CFOs who opened a SaaS renewal quote and thought "we could build this for less," here are seven tests for deciding whether to cancel a SaaS you already pay for and build a replacement in-house: price increases and currency exposure, per-seat pricing growth, how slowly the data and features change, legal and accounting complexity, the number of integrations, who will maintain it, and the cancellation and migration terms. It does not hide the evidence on the other side, including public guidance that favors SaaS and research showing AI-assisted development can be less stable. The first article in a five-part series.

2026-09-29Ryuta Hamamoto

WARP

Five-Year SaaS TCO | How Price Hikes and a Weak Yen Move the Build-vs-Buy Break-Even

When a SaaS renewal quote makes you think building it yourself would be cheaper, the number to put in the approval request is a five-year total, not the annual fee next to a development estimate. Using the actual track record of vendor price increases and the weak yen, and the lifecycle-cost principle in Japan's Digital Agency guideline DS-310, this article works through a model case of a Japanese company (300 users, $60 a month, ¥160 to the dollar, all our own assumptions) with maintenance, security, and people included, and tables the variables that move the break-even point.

2026-09-29Ryuta Hamamoto

WARP

Which Business Systems Can You Build Yourself? Sort Them by How Often the Data Changes

Internal FAQs, ledgers, and intranet portals rarely change their data, and with generative AI they have become realistic to build and own yourself. But read plainly, Gartner's pace-layered model says the opposite: slow-changing systems of record belong on standard packages. This article adds a second axis, weight (complexity, volume, and regulation), sorts business functions into four groups, and gives a quick-reference table showing what to build and what, like accounting and payroll, should stay on SaaS.

2026-09-29Ryuta Hamamoto

WARP

How Far to Insource AI: Drawing the Line Against Outsourcing

Insourcing is a means, not an objective. You do not need everything in house, and handing it all over causes its own problems. Two axes settle it: how often it changes, and how much your own operational knowledge matters. IPA found 85.5% of Japanese firms short of people to drive DX. Given that, here is how to decide what sits inside.

2026-09-20Ryuta Hamamoto

WARP

Getting Out of PoC Limbo: Decide the Exit First

A proof of concept that goes nowhere is rarely a failure of enthusiasm or technology. It is a failure to define, before starting, what would justify going to production. In IPA's 2026 survey of Japanese firms, 91.6% reported AI made work faster; 3.9% reported higher revenue or profit. That gap is what PoC limbo actually looks like.

2026-09-20Ryuta Hamamoto