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Custom Software and Web Application Development

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Custom software, designed and built end to end

D&S, Inc. designs, builds, and operates web applications, mobile apps, business systems, and API platforms. From the first plan through release and operations, we build software that solves the real problem, to Japanese quality standards.

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At a glance
Scope
Planning through release, then operation
We build
Web apps, mobile apps, business systems, API platforms
Team
Tokyo head office and Kathmandu hub

What changes when one team owns it

Today
  • Requirements live in one person's head
  • The estimate arrives as a single number
  • The vendor leaves at release
  • Nobody owns the system after launch
With D&S, Inc.
  • Scope agreed and estimated in phases
  • One team from first plan through release
  • We operate what we build
  • Changes handled by the people who wrote it

Our delivery process for custom software

A single team carries the work from initial planning through release, and continues to operate the system after launch.

  1. Plan

    Scope and requirements

  2. Design

    Architecture and interface

  3. Build

    Development and testing

  4. Release

    Launch to production

  5. Operate

    We keep it running

What we offer

Web and mobile applications

Customer-facing web and mobile applications, designed around your users and built for performance.

Business systems and API platforms

Internal systems, integrations, and API platforms that streamline your business operations.

End-to-end delivery

We cover the full product lifecycle: planning, design, development, testing, and release, with one accountable team throughout.

Long-term operation

D&S, Inc. operates and maintains the systems it builds, so your software continues to perform well after launch.

Start your next project with D&S, Inc.

Share your requirements, and we will help you scope, design, and deliver the system, from initial planning through to production.

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Common questions about custom software development

What does D&S, Inc. build?

Web applications, mobile applications, business systems, and API platforms. We work across the full lifecycle, from requirements and design through development, testing, release, and ongoing operation.

Do you take over an existing system, or only build new ones?

Both. We take on new development and we also take over systems built in-house or by another vendor. For an existing system we start with a review of the current code, infrastructure, and operational load before proposing next steps.

How is a project estimated?

We scope the work with you first, then estimate against a defined phase plan rather than a single lump figure. Where requirements are still moving, a dedicated team is often a better fit than a fixed-scope contract.

What happens after release?

We operate and maintain what we build. Monitoring, updates, fixes, and improvement work continue under the same team rather than being handed to a separate vendor at go-live.

What technologies do you work with?

Our engineering spans web front ends, mobile applications, server-side systems, and cloud infrastructure. We choose the stack against your operating constraints and the people who will maintain the system, not against fashion.

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