You will get Custom business ERP — web app with document automation, PWA
Project details
I build custom web ERP systems for small businesses that need real operational tools — not spreadsheets, not expensive SaaS, not an 18-month enterprise implementation.
The system I built covers the complete business cycle for a construction company: managing objects, clients, workers, and a service price list — with automatic generation of estimates, acts, invoices, contracts, and subcontractor agreements directly from database records. One click produces a filled DOCX, another converts it to PDF. Everything saved, everything tracked.
Built on Node.js + Fastify with SQLite — lightweight, reliable, zero licensing cost. Deployed as a PWA so it works on any device including phones. Runs on self-hosted hardware with external access via secure tunnel — infrastructure cost: effectively zero per month.
Financial module tracks income and expenses per project, links transactions to estimates, and gives management a dashboard with key metrics across all active objects.
If your business currently runs on manual documents and scattered spreadsheets — this is the system that replaces all of it.
The system I built covers the complete business cycle for a construction company: managing objects, clients, workers, and a service price list — with automatic generation of estimates, acts, invoices, contracts, and subcontractor agreements directly from database records. One click produces a filled DOCX, another converts it to PDF. Everything saved, everything tracked.
Built on Node.js + Fastify with SQLite — lightweight, reliable, zero licensing cost. Deployed as a PWA so it works on any device including phones. Runs on self-hosted hardware with external access via secure tunnel — infrastructure cost: effectively zero per month.
Financial module tracks income and expenses per project, links transactions to estimates, and gives management a dashboard with key metrics across all active objects.
If your business currently runs on manual documents and scattered spreadsheets — this is the system that replaces all of it.
Programming Languages
HTML & CSS, JavaScript, PythonWhat's included
| Service Tiers |
Starter
$200
|
Standard
$500
|
Advanced
$900
|
|---|---|---|---|
| Delivery Time | 7 days | 12 days | 18 days |
Number of Revisions | 0 | 0 | 0 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
Optional add-ons
You can add these on the next page.
Additional Revision
+$30
Source Code
+$50Frequently asked questions
About Alexey
Google Apps Script Developer | API Integration & Business Automation
Da Nang, Vietnam - 9:59 am local time
No overengineering. If Sheets solves the problem — I use Sheets. If it needs a backend — I build one. The result is always something your team can use without a developer on call.
What I automate:
— Marketplace analytics (Wildberries, OZON, Yandex Market) — multi-endpoint API pipelines, unit economics per SKU
— Ad platform integrations (Facebook Marketing API) — automated monthly reports, zero copy-paste
— KPI dashboards — multi-department systems with live charts and auto-aggregation
— Document generation — invoices, contracts, acts auto-filled and exported to PDF
— Custom web apps and lightweight ERP (Node.js + PWA)
Recent projects:
→ E-commerce analytics: 5 API endpoints, 70 metrics, full unit economics per SKU — seller reduced reporting time from 4 hours to zero
→ Multi-cabinet marketplace integration: 3 seller accounts unified in one auto-updating dashboard
→ Construction business ERP on Raspberry Pi — auto-generates contracts and invoices as DOCX/PDF
→ KPI monitoring system for 5-department manufacturing company — management sees entire business on one screen
→ Real estate installment calculator — reduced calculation time from 15 minutes to 30 seconds
I ask questions before I start. I test before I deliver. I document what I build.
Steps for completing your project
After purchasing the project, send requirements so Alexey can start the project.
Delivery time starts when Alexey receives requirements from you.
Alexey works on your project following the steps below.
Revisions may occur after the delivery date.
Requirements mapping
I review your business entities, document types, and workflows. We agree on the data model and feature scope before any code is written.
Build backend and database
I set up the Node.js + Fastify backend with SQLite database, define all entities, and implement CRUD operations with JWT authentication.