---
title: "Custom Business Systems — Backend, Admin & Cloud — Tran Manh Tuan"
description: "Business management systems for daily operations: cases and KPIs, memberships and approvals, clinical workflows — backend, admin screens and cloud."
canonical: "https://tmtuan.dev/en/services/business-systems"
language: "en"
image: "https://tmtuan.dev/_img/og/default.5d198072-og.jpg"
tokens: 1105
---

# Custom Business Systems

For companies that run their daily work on a system of their own — and need it built, or need the one they have to keep working while it changes.

The systems on this page are not websites. People log in to them every day to do their job: a broker team following cases against KPI targets, doctors applying for a verified membership, nurses recording visits and handing over to the next shift, an advertiser watching a campaign reach the devices near a beacon. What matters is that the data stays correct and that the workflow matches how the business actually works.

That is why the work starts with the business flow rather than the screens: who does what, in which order, and which numbers people manage by. The data model and the API follow from that, and the screens come last. Each project below states which of those layers I was responsible for.

## Typical engagements

- Building a business system from its requirements: data model, API, admin screens
- Adding modules to a system already in production without breaking the data it holds
- Dashboards and reports managers rely on, kept fast with real data volumes
- Moving a business system onto cloud infrastructure that can be reviewed and rebuilt

## Related work

- [Dr.Well-B](https://tmtuan.dev/en/projects/dr-well-b)

  Multi-service platform for doctors and dentists in Japan: verified membership with approvals, profile-targeted ads, dynamic surveys, job search and batch reward points.

- [TaxPal](https://tmtuan.dev/en/projects/taxpal)

  Sales analytics for an accounting-services brokerage in Japan: cases, KPI targets against actuals, rankings and pipeline conversion by staff member, team and company.

- [Waroku Hospital Karte](https://tmtuan.dev/en/projects/waroku-hospital-karte)

  A cloud medical record and clinical workflow platform for psychiatric hospitals in Japan: patient charts, multi-step clinical orders, wards, beds, nursing and schedules.

- [Waroku Home-Visit Nursing](https://tmtuan.dev/en/projects/waroku-home-visit-nursing)

  A cloud platform for home-visit nursing in Japan: patients and their homes, case records and handover, nursing orders and plans, visit schedules, reports and assessments.

- [Beacon-based Content Delivery Platform](https://tmtuan.dev/en/projects/beacon-content-platform)

  A multi-tenant BLE/iBeacon advertising platform that recorded 761,921 device connections in a single hour while matching campaigns and delivering context-aware content.

## Technologies used in this work

- TypeScript
- Amazon RDS
- AWS S3
- BigQuery
- Docker
- Elasticsearch
- PostgreSQL
- Vue
- Vuetify
- Angular
- Apache
- Apollo Client
- AWS AppSync
- AWS Cognito
- AWS EC2
- AWS Lambda

## Is this a fit?

- A good fit: business systems, backends and APIs, GCP and AWS infrastructure, production incidents.
- Not the right fit: work that is mainly pixel-perfect UI or heavy animation.

If this sounds like the problem you have, [Send a project brief](mailto:tmtuan801@gmail.com?subject=Project%20inquiry%20%E2%80%94%20tmtuan.dev&body=Project%20type%3A%20custom%20business%20system%20%2F%20web%20platform%20%2F%20cloud%20%26%20DevOps%20%2F%20production%20issue%20%2F%20other%0D%0A%0D%0AWhat%20needs%20to%20be%20built%20or%20fixed%3A%0D%0A%0D%0ACurrent%20stack%20(if%20any)%3A%0D%0A%0D%0ATimeline%3A%0D%0A%0D%0ABudget%20range%20(optional)%3A%0D%0A).

Your email app opens with a short brief to fill in.

## Structured data (JSON-LD)

```json
{"@context":"https://schema.org","@graph":[{"@type":"WebPage","@id":"https://tmtuan.dev/en/services/business-systems#webpage","url":"https://tmtuan.dev/en/services/business-systems","name":"Custom Business Systems — Backend, Admin & Cloud","description":"Business management systems for daily operations: cases and KPIs, memberships and approvals, clinical workflows — backend, admin screens and cloud.","inLanguage":"en","isPartOf":{"@id":"https://tmtuan.dev/#website"},"about":{"@id":"https://tmtuan.dev/#person"}},{"@type":"Service","@id":"https://tmtuan.dev/en/services/business-systems#service","name":"Custom Business Systems","description":"Business management systems for daily operations: cases and KPIs, memberships and approvals, clinical workflows — backend, admin screens and cloud.","url":"https://tmtuan.dev/en/services/business-systems","serviceType":"Custom Business Systems","provider":{"@id":"https://tmtuan.dev/#person"}}]}
```