BACKEND SYSTEMS · ERP · ENTERPRISE SOFTWARE

Engineering the systems behind real operations.

I'm Roodraditya Das, a Software Developer focused on backend engineering, enterprise ERP workflows, API architecture, PostgreSQL/MySQL data systems and business-critical integrations. I translate operational rules into software that stays traceable, maintainable and consistent.

Explore Engineering Work → View System Architecture
PYTHON · DJANGO · FASTAPI · PHP · POSTGRESQL · SUPABASE · SAP B1 API · WHATSAPP API · VERCEL
enterprise_system.map ARCHITECTURE ONLINE
Operations UIAdmin · Dealer · Store
Production · QC
API BoundaryREST · Validation
Authentication
IntegrationsSAP B1 API · WhatsApp API
External Services
↓    REQUEST / RULE / STATE    ↓
BUSINESS LOGIC & WORKFLOW ENGINE
permissions · lifecycle · allocation · traceability
CORE
↓    TRANSACTIONAL DATA    ↓
Relational DataPostgreSQL · Supabase · MySQL
state · history · ledgers
Enterprise LayerSAP Business One
service integration
ERPbusiness workflows
APIintegration layer
DBstate & traceability
Since 2023Professional software development
ERPProcurement to dispatch workflows
SAP B1Enterprise integration exposure
API-firstSecure service integrations
01 · Engineering Profile

I build business systems, not just screens.

My strongest work sits where software meets operations: inventory, production, serial traceability, dealer orders, dispatch, warranty, payments, permissions and enterprise integrations.

I work on software where a change in one module can affect stock, production, dispatch or downstream reporting. That makes data integrity, lifecycle state, validation, permissions and traceability as important as the UI.

My approach is to understand the business event first, model its state and constraints, then design the application and integration boundaries around it. The result is software that can evolve without losing control of the process.
Model the workflowRepresent the actual business lifecycle instead of isolated forms.
Protect stateValidate transitions, duplicates, ownership and availability.
Design for traceabilityKeep operational history understandable across modules.
Integrate deliberatelyKeep external APIs and enterprise systems behind clear boundaries.
02 · Architecture Thinking

From operational event to durable system state.

A typical enterprise feature is more than a database insert. It crosses identity, rules, availability, workflow state, integrations and reporting.

Example request lifecycle
01 / INPUT
User ActionDealer, store, production, QC or admin event.
02 / CONTROL
ValidationRole, status, duplicate and availability checks.
03 / DOMAIN
Business RulesAllocation, priority, serial and lifecycle logic.
04 / DATA
State UpdateRelational records, history and transactional state.
05 / OUTPUT
IntegrationSAP, messaging, labels, reports or downstream modules.
INPUT ───────── VALIDATE ───────── DECIDE ───────── PERSIST ───────── INTEGRATE

Application & Domain Layer

  • Role-aware access and operational permissions
  • Workflow state machines and reversible transitions
  • Priority, allocation and availability rules
  • Serial-number validation and traceability

Data & Integration Layer

  • Relational modelling and transactional updates
  • REST / JSON service boundaries
  • SAP Business One integration workflows
  • Messaging, QR, labels and external API connections
03 · Selected Systems

Engineering work shaped by real operational constraints.

Selected areas from enterprise ERP and backend development, presented as systems rather than isolated features.

SYSTEM / 01MANUFACTURING

Production Planning & Serial Traceability

Production workflow connecting store-issued VIN, motor and controller serials with assembly, QC and finished-product state.

STORE→PLAN→ASSEMBLY→QC→FINISHED GOODS
Availability validation against issued inventory
Duplicate prevention and serial lifecycle control
Model / colour constraints and production-plan state
Traceable movement from issue to finished product
PHPMYSQLAJAXERPTRACEABILITY
SYSTEM / 02SUPPLY CHAIN

Dealer Order, Allocation & Dispatch Engine

Workflow for matching available finished stock against dealer demand while preserving order priority and partial allocation rules.

PI→DO→ALLOCATE→QC→PACK→DISPATCH
Model and colour based stock matching
Priority-aware allocation with manual control
Partial dispatch and remaining-demand handling
Operational status transitions across teams
BUSINESS LOGICMYSQLWORKFLOWALLOCATION
SYSTEM / 03INTEGRATION

SAP Business One Integration Layer

Integration-oriented backend work connecting custom operational ERP workflows with SAP Business One facing services.

CUSTOM ERP→API→VALIDATE→SAP B1
REST / JSON based communication boundaries
Authentication and structured request handling
Mapping operational data into enterprise workflows
Error-aware integration and controlled updates
SAP B1REST APIJSONCURLINTEGRATION
SYSTEM / 04INVENTORY

Battery, Charger & Material Stock Control

Operational stock model for physical inventory, safety levels, demand visibility and battery/charger mappings across business flows.

STOCK→DEMAND→MAPPING→CONTROL
Daily physical-stock capture and derived values
Demand visibility from approved operational records
Battery-pack component mapping and normalization
Role-specific add, edit and view permissions
INVENTORYMYSQLRBACDATA MODEL
SYSTEM / 05IDENTITY / LABEL

QR Identity & Production Label Pipeline

Structured product identity flow combining UID, chassis, motor, controller and component information into printable traceability labels.

SERIALS→UID→QR PAYLOAD→LABEL
Unique product identity generation
QR payload composition across serial components
Status-aware label and production workflow
Printer-oriented compact label output
QRSERIAL DATAPRINTVALIDATION
SYSTEM / 06CUSTOMER OPS

Warranty & Communication Automation

Backend automation connecting registration data with warranty documents, email delivery and WhatsApp communication flows.

REGISTRATION→DOCUMENT→EMAIL+WHATSAPP
Customer and registration based message generation
Warranty-document link delivery
Mail and WhatsApp API orchestration
Backend batch-processing workflows
PHPEMAILWHATSAPP APIAUTOMATION
04 · Engineering Stack

Tools organized by responsibility, not logos.

The stack changes by project. The engineering concerns—data integrity, maintainability, observability and clear boundaries—stay consistent.

BE

Backend Engineering

PYTHONDJANGOFASTAPIPHPLARAVELCODEIGNITERNODE.JSREST API
DB

Data & Persistence

POSTGRESQLSUPABASEMYSQLRELATIONAL MODELINGTRANSACTIONSQUERY DESIGN
EN

Enterprise Systems

ERPSAP BUSINESS ONEPROCUREMENTINVENTORYPRODUCTIONDISPATCH
IN

Integration

SAP B1 APIWHATSAPP APIJSONWEBHOOKSJWTOAUTHPAYMENT API
FE

Application UI

JAVASCRIPTJQUERYHTMLCSSBOOTSTRAPAJAX
OP

Engineering Operations

GITGITHUBVERCELCLOUDFLARELINUXDOCKERPOSTMAN
05 · Modern Backend & Cloud

A backend stack that can move from enterprise ERP to modern cloud products.

Alongside PHP/MySQL enterprise systems, my current architecture direction includes Python services, PostgreSQL/Supabase, API-first applications and Vercel-based delivery.

Python Services

Django for structured business applications and FastAPI for typed, high-performance API services.

PYTHON / DJANGO / FASTAPI
PostgreSQL + Supabase

Relational PostgreSQL data with Supabase Auth, Storage and API capabilities for modern applications.

POSTGRES / AUTH / STORAGE
Enterprise APIs

Integration boundaries for SAP Business One, WhatsApp messaging and external business services.

SAP B1 API / WHATSAPP API
Cloud Delivery

Git-based deployment workflows with Vercel and DNS / edge architecture designed for production delivery.

GITHUB / VERCEL / CLOUDFLARE
API surface

Service-oriented backend

GET /apiPublic portfolio and application data
POST /apiValidated business operations
AUTHSupabase Auth / role-aware access
INTEGRATESAP B1, WhatsApp and external APIs
Modern application topology

From client to enterprise systems

React / Web ClientUI LAYER
↓ HTTPS / JSON
Python · Django · FastAPISERVICE LAYER
↓ DATA + BUSINESS RULES
PostgreSQL · SupabaseDATA / AUTH / STORAGE
↓ INTEGRATION BOUNDARY
SAP B1 API · WhatsApp APIENTERPRISE SERVICES
↓ DELIVERY
GitHub · Vercel · CloudflareDEPLOYMENT / EDGE
06 · Experience

Progressively deeper into backend and business systems.

Professional experience spanning business applications, APIs, SaaS workflows and enterprise ERP engineering.

OCT 2025
— PRESENT

Software Developer

Go With Green E-Vehicles Pvt. Ltd.

Enterprise ERP development across procurement, inventory, production, supply chain, dealer operations, finished-product control, warranty and internal workflows, with secure API architecture and SAP Business One integration.

ERPPHPMYSQLSAP B1API
JAN 2025
— SEP 2025

Software Developer

Go Webs Web Solution Pvt. Ltd.

Developed backend APIs using PHP and Node.js, payment integrations, domain-based configurations, role-based systems and SaaS-oriented application workflows including wallet and commission logic.

PHPNODE.JSAPIPAYMENTSSAAS
FEB 2023
— DEC 2024

Web Developer

Leelija Web Solutions Pvt. Ltd.

Worked on PHP/MySQL business applications including healthcare management, medicine inventory, pathology booking, payment integration, reporting, attendance and internal office-management workflows.

PHPMYSQLBUSINESS APPSREPORTING
07 · Additional Backend Work

Experience beyond the current ERP ecosystem.

Earlier and supporting work across commerce, healthcare, restaurant systems and SaaS-style business logic.

BACKEND PROJECTHOSPITALITY

Restaurant Management API

Backend-driven restaurant system covering menu, ordering and table-booking workflows with availability-oriented application logic.

CODEIGNITER 4REST APIMYSQLWEBSOCKET
BACKEND PROJECTCOMMERCE

E-Commerce API Platform

API-oriented commerce backend covering authentication, product management, cart and order-processing workflows.

LARAVELREST APIDOCKERPHPUNIT
BUSINESS APPLICATIONHEALTHCARE

Healthcare Management Platform

PHP/MySQL application integrating medicine inventory, pathology booking, payments, reporting and operational communication.

PHPMYSQLRAZORPAYREPORTING
SAAS APPLICATIONBUSINESS ENGINE

MLM Business Engine

Contributed to member onboarding, wallet management, commission processing and binary-tree based distributor workflows.

PHPJQUERYSAASBUSINESS LOGIC
Let's Connect

Interested in backend systems, ERP or enterprise applications?

I'm interested in engineering opportunities where software has to model real operations, protect data integrity and solve meaningful backend or architectural problems.

Email Me → LinkedIn
EMAILjobsfordasroodro@gmail.com
LINKEDINroodraditya-das ↗
FOCUSBackend / ERP / Architecture
STATUSOpen to relevant opportunities