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tenajimi

Services

Services

We care less about project size than about whether it keeps working afterwards. From one-off implementation to long-term engagements that include building your team.

Product Development

Design and implementation of web applications and internal systems

We start from framing the problem and defining requirements, then take on technology selection, design, implementation, launch, and standing up operations. We also work on existing systems — including code that runs fine but has become hard to change.

  • Requirements definition and technology selection
  • New web applications and internal systems
  • Modernizing and replacing existing systems
  • API design and third-party integrations
  • CI/CD and infrastructure (Cloudflare / AWS / GCP)

AI Enablement

Turning generative AI into features people actually use

The point is not to stop at a proof of concept. We identify where AI actually pays off, design the RAG or agent architecture, build the evaluation loop, and tune cost and accuracy until it is ready to run in production.

  • Identifying and validating where generative AI fits
  • RAG for internal document search and knowledge work
  • AI agents and workflow automation
  • Output evaluation and prompt improvement loops
  • Inference cost and latency optimization

Technical Advisory

Alongside your team until they can carry it

A weekly session plus asynchronous review, focused on design decisions and technology choices. The aim is not to do the work for you — it is to get your team to the point where they can move on their own.

  • Architecture and technology selection review
  • Code and design review
  • Development process and CI/CD
  • Rolling out generative AI internally
  • Hiring criteria and technical interview design

Products

What we build

Alongside client work, we build and run our own services.

  • Japanese postal code search

    Address Engine JP

    Search Japanese addresses from either direction: type a postal code to get the address, or type a town or municipality name to find the postal code. Suggestions appear as you type.

    zip.tenajimi.com（Visit the site）

    • Postal code to address lookup
    • Reverse lookup from town and municipality names
    • Public REST API (GET /api/v1/postal-codes/{code})

    Data source: Japan Post "Postal Code Data (KEN_ALL)"

Technologies we use

We pick the tool that fits the job. These are the areas we know deepest.

Frontend
  • TypeScript
  • React
  • Next.js
  • Astro
  • Tailwind CSS
Backend
  • Node.js
  • Python
  • Go
  • PostgreSQL
  • Hono
AI / LLM
  • Claude API
  • RAG
  • Vector search
  • Agent design
  • MCP
Infrastructure
  • Cloudflare Workers
  • AWS
  • GCP
  • Docker
  • GitHub Actions

From first contact to kickoff

  1. Get in touch

    Send the form or an email. We reply within three business days.

  2. Discovery call (free, ~60 min)

    An online conversation about where you are and where you want to get to. Nothing needs to be specified yet.

  3. Proposal and estimate

    We lay out an approach, scope, timeline, and cost — usually with a smaller first phase as an option.

  4. Contract and kickoff

    Once the terms work for you, we sign and start.

Go to the contact form