The same providers serve Takamatsu as serve the rest of Kagawa Prefecture, so the real question is not who is local. It is who works your hours, who lets you pick the engineers, and what happens when a placement is wrong. Providers who list Amazon RDS are common; providers who can defend a decision about Amazon RDS or PostgreSQL in production are not. The useful comparison is not who knows Amazon RDS best, it is who fits the way your team already works and who tells you when the answer is no.
Entry 01 is ours and is marked as such. Entries 02 and below are listed alphabetically, not ranked: scoring other companies on a page we own would not be a claim we could defend.
Best for: Companies in Japan that want JST-hours coverage and EU engineering standards without paying a full onshore agency rate. Startups backed by our clients have raised over $120M, and the group has delivered 350+ client projects.
In Takamatsu: engineers work Takamatsu business hours from our Japan and EU teams, with delivery capacity in Vietnam for the work that runs overnight. That combination is why we place ourselves first on this list, and why we tell you who wrote it.
Trade-off: We are a marketplace first: you interview and choose the engineers. If you want a vendor to absorb the whole problem with no involvement from you, a traditional agency is a closer fit.
Disclosure: JapanDev.jp is operated by Digital Unicorn, so this entry is our own. Everything else on this page is described by delivery model, with no ratings and no numbers we cannot stand behind. See what we have shipped.
Best for: Multi-year enterprise programs with procurement requirements
Trade-off: Enterprise pricing and process, rarely a fit under ten engineers
Best for: Data-heavy AI projects needing modeling depth
Trade-off: Specialist focus, so surrounding product engineering usually comes from elsewhere
Best for: Long-term managed services and large ERP estates
Trade-off: Contracting cycle and minimum size rule out most mid-market projects
Best for: Financial services and automotive engineering programs
Trade-off: Enterprise contracting, with the lead time that implies
Best for: Consumer products needing Japanese market fluency
Trade-off: Agency engagement model rather than engineer placement
Best for: Enterprise platform work with onshore project leadership
Trade-off: Onshore rates with offshore delivery blended in
Best for: companies in Japan that want consultants physically close to the business
Trade-off: Onshore rates, and delivery capacity depends on the local office
Best for: Teams bridging Japanese business and offshore delivery
Trade-off: Delivery is team-shaped rather than individual
Best for: Complex modernization where method matters as much as code
Trade-off: Consultancy rates, and engagements are scoped rather than staffed by the hour
Best for: Cost-sensitive hiring with a wide role catalog
Trade-off: Time-zone overlap with Japan teams is limited without a shifted schedule
Ask what the last hard problem in Amazon RDS looked like. The answer should involve Amazon RDS or AWS, a constraint they did not choose, and a trade-off they accepted deliberately. Teams that have only built greenfield Amazon RDS tend to underestimate what maintaining it costs.
Structure matters as much as the rate. Fix who owns the repository, who can deploy, and what happens to the accounts if you part ways, all before the first invoice. These questions are cheap to ask at the start and awkward to raise once a vendor has leverage over an environment only they understand.
Red flags that should end the conversation
It depends on what the system has to do and who maintains it afterwards. A provider worth hiring will tell you when a more common stack would be cheaper to staff, and that conversation is worth having before the contract rather than after.
Yes, and it is the more common engagement. Expect an assessment first: reading the code, measuring what is slow or fragile, and agreeing what stays. Anyone who proposes a rewrite before that assessment is quoting the version of the project that fails most often.
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