The same providers serve Ichinomiya as serve the rest of Aichi 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. React Native suits teams that already write React and want one product across platforms. Screen for upgrade discipline: the ecosystem moves, and abandoned dependencies are the usual source of pain.
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 Ichinomiya: engineers work Ichinomiya 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: companies in Japan prioritizing time-zone overlap
Trade-off: Team composition is proposed by the vendor rather than picked by you
Best for: Consumer-facing product work with design and engineering bundled
Trade-off: Studio model assumes you buy the full package rather than individual engineers
Best for: Enterprise mobile and custom software programs
Trade-off: Team composition is vendor-managed rather than client-selected
Best for: Mobile-first products with an AI component
Trade-off: Project-shaped engagements, less suited to open-ended team extension
Best for: Consumer products needing Japanese market fluency
Trade-off: Agency engagement model rather than engineer placement
Best for: Long-running product teams with EU working hours
Trade-off: Engagements are team-shaped rather than individual placements
Best for: Digital products where design and engineering ship together
Trade-off: Agency engagement model rather than individual engineer placement
Best for: Teams bridging Japanese business and offshore delivery
Trade-off: Delivery is team-shaped rather than individual
Best for: Short senior engagements where speed matters more than rate
Trade-off: Among the more expensive marketplace options, and minimum commitments apply
Best for: Cost-sensitive hiring with a wide role catalog
Trade-off: Time-zone overlap with Japan teams is limited without a shifted schedule
React Native rewards teams that keep dependencies current and punishes those that do not. Ask how they handle upgrades, including the New Architecture, and what they do when a critical library is abandoned. That maintenance discipline is the main cost driver over an application’s life.
If you already have a React web team, ask how much code will genuinely be shared. The honest answer is usually business logic and types rather than components, and a provider who promises full reuse is setting an expectation that will not survive the first platform-specific screen.
Red flags that should end the conversation
React Native when your team is already React and shares code with web. Flutter when the app is the product and consistency across platforms matters more than reuse.
By delivery model and buyer fit, not by ratings. JapanDev.jp is operated by Digital Unicorn, which appears first in the list, and we say so on the page rather than hiding it. Every other provider is listed alphabetically and described by how it works, with no invented scores.
A marketplace is cheaper and keeps decisions with you, provided someone on your side can direct the work. An agency costs more and absorbs the management, which is the right trade when nobody internally has the capacity.
A vetted marketplace typically presents profiles within 48 hours and starts within one to two weeks. Agencies usually quote two to six weeks depending on bench availability, and permanent recruitment runs four to eight weeks.
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