TESTIMONIALS

Customer Voices

Real feedback from companies and people who actually use us

Happy feedback from Rikiman, Nihon Joint Solutions, Nabell, and more
AI Advisor

Nabel Corp. — 199 employees, zero IT dept, acquiring a software procurement judgment axis

Industry: Manufacturing (bellows maker, 199 employees)

Client: Nabel Corp.

Situation

Founded in 1972, 199 employees. Expanding from hardware to software-involved new development (Robot Insight). With no IT department, couldn't judge the validity of software estimates.

Request

Continuous AI Advisor as external IT advisor

Proposal

  • Software estimate validity reviews
  • Vendor comparison and selection support
  • Technical organization for new projects
  • Advisory on AI utilization direction

Result

Client proposed raising the monthly fee before contract renewal — that level of satisfaction. Acquired a judgment axis for new software projects.

Customer's Voice

We were OK-ing software estimates without seeing their validity. Without the advisor, the project itself might not have happened.

--- Yoshitomo Nagai, CEO, Nabel Corp.

AI Advisor

Mizunara Co., Ltd. — pgVector design support for a ¥60M-class municipal project

Industry: IT / Public-sector document platform

Client: Mizunara Co., Ltd.

Situation

Approx. ¥60M municipal contract. The customer wanted 'similar document search' but Mizunara couldn't reach 'vector search' as an option on their own. Tech selection required accountability, achievement-rate and operational-load considerations.

Request

Design review for technical selection including vector search

Proposal

  • Proposed vector search
  • Compared options on cost and operational difficulty
  • Organized pgVector adoption pitfalls
  • Supported design decisions matching constraints

Result

Tech selection advanced; pgVector adoption and surrounding operations could move forward smoothly

Customer's Voice

If the design and pitfalls are clear in advance, implementation can proceed in today's environment. Having that organized for us was huge.

--- Masayuki Oda, CTO, Mizunara Co., Ltd.

AI Advisor

Rikiman (リキマン) — 90% Reduction in Shipping Label Creation, Manufacturing DX Frontline

Industry: Manufacturing (Construction Hardware)

Client: Rikiman (リキマン)

Situation

Handwritten inspection reports, inability to evaluate vendor quotes, and issues with core system development vendor. The company's 'throw people at every problem' approach had reached its limits.

Request

Adoption of Generative AI Advisor service for operational efficiency and DX promotion

Proposal

  • Automated shipping label pipeline (Core system CSV → GAS → Label software)
  • Digitization of inspection reports (Google Form → Spreadsheet → Google Docs)
  • IT vendor quote scrutiny and correction
  • Core system development process improvement guidance

Result

90% reduction in shipping label workload (rolled out to all offices), 50-60% reduction target for inspection reports, discovered and corrected ¥100K markup on outdated PC from vendor, expanded internal AI users to 17+

Customer's Voice

Having someone who understands IT as a supporter for the company — isn't that actually cheap? Without Tominaga, we would have paid vendor quotes without question. AI is like everyone having their own personal secretary — and that's gradually becoming reality.

--- Rikiman (リキマン) Tokyo Branch Manager Takeshi Isoda

Generative AI / AI DevelopmentPR TIMES

AI Technology Optimization Support for ExaEdge Co. Ltd. - Improving Accuracy of Legal Document Analysis

Industry: Software Development

Client: ExaEdge Co. Ltd.

Situation

Supported optimization of AI technology developed by ExaEdge Co. Ltd. (Ho Chi Minh, Vietnam), improving accuracy of Natural Language Processing (NLP) utilizing OpenAI's ChatGPT technology and optimizing processing speed.

Implementation

  • Improve legal document analysis accuracy
  • Enhance summarization algorithm
  • Significantly improve processing speed
  • Contribute to reducing burden of corporate legal work and improving operational efficiency

Result

Achieved 40% reduction in operating costs for the service at ExaEdge

Customer's Voice

With Leach's technical support, our legal AI has evolved dramatically. Especially, achieving both cost reduction and performance improvement through NLP optimization and Firebase serverless operation is a very big achievement. Thanks to this technical support, we are now able to provide rapid and accurate legal AI solutions to more companies.

--- ExaEdge Co. Ltd. CEO Nishikawa

AWS Diagram TranscriptionPR TIMES

AWS Diagram Transcription Support for Japan Joint Solutions Co., Ltd.

Industry: Software Development

Client: Japan Joint Solutions Co., Ltd.

Situation

The current AWS configuration was complex, and dependencies such as frontend, backend, infrastructure, and external APIs were unclear.

Request

AWS Diagram Transcription Support Service

Proposal

  • AWS Diagram Transcription
  • Security proposals
  • Cost optimization proposals
  • Proposals for automation with CI/CD, etc.

Customer's Voice

The initial purpose was to create an AWS diagram, but we gained value beyond that. The proposals for cost reduction and security improvement were particularly beneficial, and we expect improvement in long-term operational efficiency.

--- Japan Joint Solutions Co., Ltd. Executive Officer Munakata

Web Consulting

DynamoDB Design & Backend Development for Job Site

Industry: Freelance Engineer

Client: Private

Situation

Frontend implementation was mostly complete. Backend development was outsourced but incomplete, and implemented in PostgreSQL instead of DynamoDB as specified.

Request

Fix backend code with DynamoDB & enable local env / proper deploy

Proposal

  • Create DynamoDB design draft
  • Explain and decide whether DynamoDB or current PostgreSQL is appropriate
  • Propose whether to rewrite backend code to DynamoDB or make it work with current PostgreSQL
DX ConsultingPR TIMES

Spoke at 'Setouchi-i-Base' talk event operated by Leach Inc. and Kagawa Prefecture

Industry: Government

Client: Kagawa Prefecture Setouchi-i-Base

Situation

Spoke at the entrepreneur talk event 'Map of Independence/Entrepreneurship in Takamatsu' held at 'Setouchi-i-Base', an open innovation base in Takamatsu City operated by Kagawa Prefecture, on Tuesday, February 27, 2025.

MENTA

MENTA Reviews

Reviews on "MENTA", a technical mentoring platform

4.9
|29 reviews|★5: 28

I consulted on a case that other mentors couldn't solve! The guidance led me to solutions from perspectives no one else could provide! I was continuously amazed by the brilliant approaches!! I learned so much, and everything was thoroughly explained. Highly recommended among all mentors!

S

The results exceeded my expectations. Tominaga-san's technical skills are top-class — I felt there was no error he couldn't resolve. His personality is also wonderful, and I'm very satisfied.

Yuzushiba

I had environment-specific security errors, but Tominaga-san leveraged his experience at a major corporation to handle them carefully. Not many people can deal with these issues — truly a high-level professional.

Fujihara

I requested a design review for blockchain development. Beyond design documents, development processes, and technical advice, I received extensive guidance on blockchain-specific issues and implementation methods. Very valuable.

Mikan

I was struggling with authentication and authorization implementation, and couldn't solve it on my own. The guidance was extremely helpful! I believe he is a very skilled engineer!

Masa

Despite my sudden request, he kindly took on my consultation. He supported the entire process of deploying to a Sakura server via GitHub with Laravel. As a beginner, I'm grateful for the thorough and detailed guidance.

otayuria

Thank you for the short but productive time! You answered every question and even helped me create a learning roadmap. Much appreciated.

aiueo5000

I consulted about infrastructure and cloud architecture. The responses were extremely thorough and very helpful.

hikaru.coupe

Thank you for all the incredibly helpful advice!! The product direction changed significantly, so I'll pause for now, but I'll reach out again when I need help!!

schwarzwald

I had a casual consultation about work-related topics. Mainly discussed API design, and toward the end, even got career advice. The API guidance was spot-on, and the life advice was encouraging. I'd like to contract again.

Yoshida

He was very attentive in listening to my concerns. I was lost about direction, but now I know what I should do. Looking forward to continued support.

Blago188

Received very thorough and accurate guidance on Docker environment setup.

Ryo Ishii

He was very supportive and resolved my issues with reliable skills. Thank you so much!

sorasuke

Quick response, very helpful. I'll consult again for AWS-related issues.

Macaroni

Quick communication and careful support — very helpful. I'll reach out again if anything comes up.

DFRD

Fast responses, and he shows me what I want to know and provides clear direction. Very easy to work with.

P-2

Received very thorough and kind support! I may consult again in the future — please take care of me then!

Shijo

The guidance was easy to understand and thorough — very helpful. Thank you. Looking forward to working together again.

marina00

A very knowledgeable person — I learned a lot.

Dachiko

Answered my questions very thoroughly and kindly. Thank you.

Maruyama

The answers to my questions were extremely thorough and educational.

Shuichi TANAKA

Clear explanations — very helpful. I'll be back when things settle down.

Koji1210

I'd be happy to consult again if anything comes up. Thank you!

otayuria

Thorough support — I'm very grateful.

Miki

Very helpful. Thank you.

Taka0130

I'd like to re-contract in a few months. Thank you.

minhouse10

Thank you.

Nieda Yoshiaki

I may need your help again — thank you for everything.

Nifudo

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