The same providers serve Kashiwa as serve the rest of Chiba 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. Ecommerce management is outsourced operations rather than a project: merchandising, listings, promotions, and the daily decisions in between. Commerce partners should be judged on peak behaviour and on checkout, not on portfolio screenshots. Ask what broke during their clients’ last peak season and what they changed afterwards.
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 Kashiwa: engineers work Kashiwa 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: Mixed engagements combining build and staffing
Trade-off: Breadth over specialization in any single stack
Best for: Consumer products needing Japanese market fluency
Trade-off: Agency engagement model rather than engineer placement
Best for: Digital products where design and engineering ship together
Trade-off: Agency engagement model rather than individual engineer placement
Best for: Long-running maintenance and feature work
Trade-off: Fully remote model, less suited to on-site requirements
Best for: Teams bridging Japanese business and offshore delivery
Trade-off: Delivery is team-shaped rather than individual
Best for: Cost-sensitive custom builds with defined scope
Trade-off: Time-zone overlap with Japan teams requires a shifted schedule
Best for: Cost-sensitive hiring with a wide role catalog
Trade-off: Time-zone overlap with Japan teams is limited without a shifted schedule
Best for: Mobile and web products with design included
Trade-off: Agency model, so you buy the team rather than the individuals
Peak season is the honest test. Ask what happened during their clients’ last peak: what broke, what they had prepared, and how long recovery took. Agencies that have lived through one answer with specifics, and that experience is most of what you are paying for.
Insist that measurement comes before redesign. Small improvements to checkout and page speed usually beat a rebuild, and a partner who wants to measure first is protecting revenue rather than maximising the invoice.
Red flags that should end the conversation
Outsourcing works when volume is steady and the brand voice is documented. It struggles when merchandising decisions need product knowledge that only your team holds.
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.
Vetted engineers matched to your stack and your hours in 48 hours. $0 until you hire.
🇯🇵 東京、大阪をはじめ日本全国の企業から信頼されています