Yusuke Hasegawa

Business Owner, Director, and System Architect in Tokyo, Japan

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Hello, my name is Yusuke Hasegawa.

I'm Japanese and mainly active in Japan.


I am the founder and president of grasys Inc. in Japan and the founder of realve Inc. in the Philippines.

I believe I grew up in the web and gaming industry.

My roots are as a Unix/Linux-based infrastructure engineer/architect with experience in system architecture design, environment construction, operational design, and continuous operational improvement, and have worked on many huge-scale systems.

Personally, he is most experienced in central system design and system operation design, including monitoring systems and asset management for huge-scale systems.

I like computers and IT systems, and I don't have much of a boundary between hobby and work.

I have written technical books, interviewed for various technical magazines, and appeared in a Dell TV commercial in Japan for about 4 months in 2012.


grasys Inc.


The company name is a coined word combining the words "gratitude" and “system”.

The basis of running this company is to build better systems, stabilize the systems, and show appreciation to those around us by contributing to the world.

In the business of grasys Inc., I am mainly specialized in worldwide online games, general web-based systems, and among them, large-scale systems and data infrastructure.

We have built a Service Stack that combines public clouds such as Amazon Web Services, Google Cloud, and Microsoft Azure with OpenSource to provide optimal systems for customers seeking high scalability and cost performance. We are focusing on providing optimal systems to customers who demand high scalability and cost performance.


  • IT System Infrastructure Design
  • Analysis Infrastructure Design
  • IT system operation and maintenance
  • IT System development
  • IT Systems Consulting


  • Google Cloud Partner
    • Google Cloud Expertise
      • Google Cloud Infrastructure
      • Google Cloud Computing
  • Amazon Web Services Partner
  • Microsoft Azure Partner
  • HashiCorp System Integrator Partner, Reseller Partner
  • Elastic Verified Reseller
  • Palo Alto Networks NextWave Partner
  • Looker Consulting Partner
  • Tenable Partner

realve Inc.


The company name is a coined word combining the words "realization" and “improvement”.

I aim to be a company that can achieve difficult goals and solve problems with systems.

I would like to expand overseas, gather a new group of colleagues, and devote myself to solving even more system issues and problems and realizing my ideals.

Fly like an Eagle🦅

  • Work
    • grasys Inc. and realve Inc.