Danny Bhai
An end-to-end e-commerce and automation platform that scaled an OTT subscription business by 10x through 24/7 WhatsApp fulfillment and payment verification.
In-Depth Case Study Available
Dive into the architectural decisions, database schemas, scaling bottlenecks, and complete technical breakdown.
What It Is
DannyBhai.com was a high-volume OTT digital subscription provider whose entire operations were manually managed through physical diaries, chat messages, and spreadsheets. Customers inquired via WhatsApp, transfers were manually checked against bank SMS messages, and credentials were manually copied and pasted back.
Orders backed up for 45+ minutes, sales ground to a halt outside office hours, and errors were frequent.
I worked directly with the business founder to iteratively automate the entire end-to-end customer journey, turning a manual daytime operation into an automated, 24/7 digital fulfillment engine.
What It Does
- 24/7 WhatsApp Conversational Sales Bot: Handles product selection, plan pricing, inquiries, and checkout instructions automatically at all hours.
- Automated Bank SMS Payment Matching: In the absence of automated payment gateway APIs, built a secure SMS-to-backend bridge that parses incoming bank transaction messages and matches UTR/Reference IDs and amounts in real time.
- Sub-3-Minute Real-Time Fulfillment: Once payment is confirmed, the engine locks an available credential set from encrypted inventory and dispatches it directly to the customer over WhatsApp without human intervention.
- Automated Renewals & Retention: Tracks subscription expiration and automatically delivers renewal reminders, driving repeat customer retention.
Architecture & My Contribution
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Iterative Bottleneck Elimination:
- Rather than attempting a massive upfront rewrite, I automated one bottleneck at a time: inventory first, payment matching second, fulfillment third, retention fourth.
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Novel Payment Verification Workflow:
- Designed deep-link and QR payment prompts embedding unique transaction references, enabling 100% automated matching against raw banking SMS feeds.
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High-Availability Order Processing:
- Implemented database row locking and atomic transactions to prevent double-selling digital credentials during traffic spikes.
Skills Used & Developed
- System Design & Practical Automation: Identifying business friction points and applying pragmatic software solutions.
- Payment & Verification Workflows: Unconventional transaction reconciliation and fraud prevention.
- Operational Scalability: Helping a company scale from ~3 lakh BDT to ~30 lakh BDT in revenue over 1.5 years.
Key Learnings & Takeaways
- Build what the business actually needs today: Sophisticated tech stacks don't mean anything if they don't solve the core operational pain point. Pragmatic PHP and robust relational data models delivered massive tangible ROI.
Skills & Technologies