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Engineering Case Studies

Production Architecture & Scaled Systems

Detailed breakdowns of enterprise software, automated infrastructure, Shopify apps, and full-stack solutions built by Rahim Badsa — featuring real production metrics, technical challenges, and verified business outcomes.

Dashboard Overview & Metrics
SaaS
PODesk — Shopify Purchase Order & Reorder SaaS - Dashboard Overview & Metrics
01

Own Product — Live on Shopify App Store

PODesk — Shopify Purchase Order & Reorder SaaS

Shopify merchants needed a modern, cost-effective alternative to Stocky for automated purchase order workflows, inventory tracking, and low-stock forecasting.

Real-time GraphQL Shopify Admin API integration with zero write permissions for 100% merchant data safety
30-day velocity-based smart reorder forecasting with automated threshold alerts
One-click professional PDF purchase order generation with direct supplier emailing
Shopify Approved

Live on the official Shopify App Store with 3-tier recurring SaaS pricing and active global merchants.

Shopify APINext.jsTypeScriptPostgreSQLPrismaTailwind CSS
View on Shopify App Store
ISP Operations Command Center
Enterprise
SkyLink ISP — Management & Mikrotik Network Automation - ISP Operations Command Center
02

Commercial ISP & Broadband Infrastructure

SkyLink ISP — Management & Mikrotik Network Automation

Manual subscriber billing reconciliation, delayed payment tracking, and disconnected PPPoE user management were burning hours every month for a 2,400+ subscriber network.

Mikrotik RouterOS API automation for real-time PPPoE user provisioning, speed throttling, and auto-disconnection
Automated bKash & Nagad MFS payment reconciliation with zero-touch line reactivation
Real-time OLT optical power telemetry monitoring with automated fiber cut outage alerts
2,400+ Users

Automated operations for 2,400+ active subscribers, cutting billing collection time by 70% and eliminating manual router logins.

Node.jsExpress.jsNext.jsMikrotik APIPostgreSQLDocker
View Architecture
Logistics Hub & Dispatch Command Center
SaaS
Shohnaat Logistics — Enterprise Multi-Tenant Courier SaaS - Logistics Hub & Dispatch Command Center
03

Supply Chain & Multi-Carrier Courier Enterprise

Shohnaat Logistics — Enterprise Multi-Tenant Courier SaaS

High-volume eCommerce brands and courier hubs wasted hours manually copying orders into carrier portals with untracked returns and messy Cash-on-Delivery (COD) reconciliation.

Unified API gateway integrating 4 major nationwide couriers (Pathao, Steadfast, RedX, Paperfly)
High-throughput asynchronous job queues powered by BullMQ & Redis handling peak dispatch loads
Automated COD cash reconciliation ledger with dispute resolution and delivery OTP verification
48K+ Parcels

Processed 48,000+ parcels across 12 regional hubs with 96.8% delivery success and 80% faster packing.

PostgreSQLRedisBullMQNext.jsExpress.jsTypeScript
View Courier Platform
Multi-Vendor Storefront & Catalog
E-Commerce
Sauna — High-Performance E-Commerce Monorepo Platform - Multi-Vendor Storefront & Catalog
04

Enterprise Retail & Luxury Wellness Equipment

Sauna — High-Performance E-Commerce Monorepo Platform

Monolithic storefront architecture caused slow load times (>3.8s), inventory mismatches during peak flash sales, and painful multi-vendor coordination.

Modular Turborepo monorepo separating storefront, vendor admin dashboard, and microservice backend
Sub-150ms product catalog API powered by Redis caching and MongoDB aggregation pipelines
Multi-tier role-based access control (Admin, Vendor, Customer, Support)
<1.2s Load

Slashed page load times to under 1.2s, supporting 100+ concurrent checkouts with zero inventory drops.

ReactNode.jsExpressMongoDBDockerTurborepo
View Monorepo Architecture
Association Web Portal & Member Hub
Enterprise
Bangladesh Petroleum & LPG Distribution Operations - Association Web Portal & Member Hub
05

BD Petroleum Dealer's & Distributor's Association

Bangladesh Petroleum & LPG Distribution Operations

Nationwide petrol pump stations relied on manual paper ledgers for underground tank calibrations, tanker dispatches, and daily sales auditing.

Automated underground fuel tank dip-chart to volumetric litre conversion algorithm
Centralized government fuel price adjustment notifications broadcast across regional dealers
Immutable digital sales audit trails preventing stock reconciliation discrepancies
150+ Stations

Digitized 150+ regional fuel stations with real-time audit logs and zero paper ledger discrepancies.

Next.jsTypeScriptPostgreSQLPrismaTailwind CSS
View Association Portal
Telemedicine & Doctor Appointment Portal
SaaS
DoctorTanvir — Healthcare Telemedicine & Clinic Management - Telemedicine & Doctor Appointment Portal
06

Specialized Healthcare & Teleconsultation Clinic

DoctorTanvir — Healthcare Telemedicine & Clinic Management

Patients faced long waiting queues, double-booked appointments, and fragmented patient medical histories stored in physical paper prescriptions.

Automated time-slot booking engine with double-booking prevention and instant SMS confirmation
Secure digital prescription writer with searchable medicine database and lab report uploads
Role-based doctor, assistant, and patient self-service dashboard
500+ Consults

Served 500+ successful digital consultations, reducing front-desk scheduling phone calls by 85%.

Next.jsTypeScriptPostgreSQLPrismaTailwind CSS
View Telemedicine Platform
Plugin Command Center & Settings
WordPress
RoboLabs Enterprise WooCommerce Invoice Sync - Plugin Command Center & Settings
07

RoboLabs — Custom WooCommerce Plugin

RoboLabs Enterprise WooCommerce Invoice Sync

High-volume stores suffered from desynchronized accounting, VAT discrepancies, and manual invoicing between WooCommerce and external ERP systems.

Real-time sync monitoring with granular error inspection and automated retry queues
Automated tax/VAT resolution with atomic duplicate invoice prevention
Custom webhook triggers on WooCommerce order state transitions
10K+ Orders

Zero dropped syncs across 10,000+ monthly orders with automated VAT reporting.

WordPressPHP 8WooCommerce APIREST API
View Plugin Details
AI Automation Workflow Builder
Automation
Nexiflow AI — Intelligent Workflow Automation Platform - AI Automation Workflow Builder
08

AI Workflow & Enterprise Automation Suite

Nexiflow AI — Intelligent Workflow Automation Platform

Operations teams were overwhelmed with repetitive customer inquiries, data extraction from unstructured documents, and delayed support escalation.

Multi-model LLM routing with fallback guarantees for high-availability uptime
Vector semantic search over proprietary documentation with RAG context injection
Human-in-the-loop review queues for sensitive or low-confidence automated responses
<30s Response

Cut initial support response time from 4 hours to under 30 seconds with 92% automated issue resolution.

Next.jsPythonFastAPIOpenAI APIPineconePostgreSQL
View Platform Architecture
Lead Verification Dashboard
SaaS
LeadScreen — Automated B2B Lead Verification SaaS - Lead Verification Dashboard
09

B2B Sales Intelligence & Lead Enrichment

LeadScreen — Automated B2B Lead Verification SaaS

Sales teams suffered high email bounce rates (>14%) and wasted hours manually researching prospect LinkedIn profiles and company sizes.

SMTP handshake verification and disposable email domain detection algorithms
Asynchronous batch CSV upload processing with queue rate-limiting
Automated MX/DNS record validation with confidence scoring
<1.5% Bounce

Reduced bounce rates below 1.5% across 250,000+ verified corporate emails.

Node.jsExpressPostgreSQLRedisTailwind CSS
View SaaS Platform
Live Courier Selector & Rate Calculator
WordPress
WooCommerce Courier Selector & Auto Shipping Calculator - Live Courier Selector & Rate Calculator
10

eCommerce Merchants across South Asia

WooCommerce Courier Selector & Auto Shipping Calculator

Shoppers abandoned checkout carts due to incorrect static delivery charges for regional vs metro deliveries and lack of multi-carrier choices.

Live dynamic courier API rate calculation directly on the WooCommerce checkout page
District/Thana auto-complete with carrier coverage validation
Automated consignment tracking ID generation upon order placement
+22% Checkouts

Increased completed checkouts by 22% with zero manual shipping fee disputes.

PHPWordPressWooCommerce APIJavaScriptREST API
View Plugin Details

Have a challenging system to build or scale?

From custom Shopify SaaS apps to multi-tenant logistics platforms and high-throughput network automation, I engineer reliable web systems tailored for real business growth.

Let's Build TogetherView GitHub Repositories

About Me

Rahim Badsa is a Full Stack Web Developer from Bangladesh, specializing in MERN, Next.js, Shopify, and WordPress for practical business-focused web products.

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Contact Info

Lalmonirhat, Bangladesh

[email protected]

+880 1877-104723

FAQ

Who is Rahim Badsa?

Rahim Badsa is a Full Stack Web Developer and Shopify App Developer from Bangladesh who builds production-ready web solutions using MERN, Next.js, Shopify, and WordPress. He is also the Co-founder of Rank Fast LLC and works as a Web Developer at Trinet Digital Agency.

What kind of developer is Rahim Badsa?

Rahim Badsa (also spelled Rahim Badsa, Rahim Badsha, or Rohim Badsa) is a Bangladeshi full stack web developer specializing in MERN stack, Next.js, Shopify, and WordPress development. He has delivered 100+ projects including SaaS dashboards, Shopify custom apps, WooCommerce stores, and SEO-optimized business websites.

What technologies does Rahim Badsa use?

Rahim Badsa works mainly with the MERN stack (MongoDB, Express, React, Node.js), Next.js, TypeScript, Shopify Liquid, and WordPress, alongside Tailwind CSS, PostgreSQL, Prisma, Docker, and modern frontend tools. As a full stack developer, he handles both frontend UI and backend API development, database design, deployment, and technical SEO.

Is Rahim Badsa available for freelance or remote work?

Yes. Rahim Badsa is available for freelance, contract, and fully remote collaboration with clients worldwide. Whether you need a Shopify developer, MERN stack developer, Next.js developer, or WordPress developer, he can help. You can reach out through the contact section on this portfolio or via LinkedIn.

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