Case Studies

Projects

6 production systems — each with the problem statement, architectural decisions, trade-offs, metrics, and an interview-mode deep-dive.

N
LMS / Coaching
2024Shipped
Featured Case Study

NexusOne.coach

LMS, Live Classes & Coaching Platform

  • Courses, live Zoom classes, cohort management, automated assessments
  • RBAC permission controls with Socket.IO-driven attendance tracking
  • Stripe Checkout, Subscriptions & Connect for instructor payouts
  • Automated live-class reminders via Zoom SDK, Google Calendar and Firebase
Zoom SDKLive Classes
Checkout / Sub / ConnectBilling
Socket.IOAttendance
RBACAccess Control
ReactNode.jsMySQLSocket.ioStripeZoom SDK+3
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S
SaaS Platform
2024Shipped

Seltrix

Multi-Tenant Website Builder & Template Commerce Platform

  • Multi-tenant SaaS website builder with custom-domain publishing
  • Template marketplace for buying and selling reusable site templates
  • Dynamic public tenant rendering resolves tenant identity per request
Next.jsNode.jsExpressMySQL+4
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Z
Marketplace / Wallet
2024Shipped

ZPONZ

Expert Marketplace, Wallet & CMS Platform

  • Drag-and-drop page builder with master components and ordered schema sections
  • Stripe-backed wallet: deposits, withdrawals, escrow, scheduled expert payouts
  • Expert monetization marketplace: landing site, ad dashboard, admin CMS
ReactNode.jsMySQLSocket.io+5
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G
Government / Compliance
2024Shipped

GovPass

Government Visa Application Management System

  • Replaced paper workflow — 30% error rate → < 2%
  • Immutable event-sourced audit log (7-year retention)
  • 15+ officer role tiers with RBAC middleware
ReactNode.jsExpressMySQL+7
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A
Serverless / EdTech
2025Live

Appolo Smart Test

Enterprise Exam Evaluation & Serverless Processing

  • Serverless PDF processing pipeline — 90% less manual grading effort
  • Cursor-based MongoDB pagination — 60% faster API response times
  • TUS resumable uploads for 500MB+ video files, XSS/injection hardened
AWS LambdaSQSS3MongoDB+8
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A
AI / CRM
2023Shipped

AdUnity

Multi-Tenant CRM & AI Call Analytics Platform

  • Real-estate CRM: lead tracking, site-visit planning, tenant-scoped workflows
  • Click-to-call with AI transcription and sentiment analysis via AssemblyAI
  • Real-time incoming-call alerts and duplicate lead detection
ReactNode.jsMySQLSocket.io+3
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All projects are from real production environments. Company names omitted per NDA.