PSTU IT Carnival 2026 – Hackathon

On 1 September 2026, I participated in the PSTU IT Carnival 2026 Hackathon at Patuakhali Science and Technology University (PSTU).

For the hackathon, our team developed and presented BanglaPay (বাংলা-পে), a simulated mobile financial service created specifically for the PSTU National Hackathon 2026.

BanglaPay was designed as an educational closed ecosystem for demonstrating secure, trustworthy, and auditable digital financial transactions.

BanglaPay demonstrates a complete simulated mobile financial workflow, including:

• Mobile registration
• Virtual OTP verification
• Secure PIN authentication
• OCR-assisted NID KYC
• One-active-device control
• Simulated BDT wallets
• Money transfers
• Payment requests
• Transaction receipts
• Append-only double-entry ledger

The project does not process real money and does not connect to actual NID, banking, card, mobile operator, or payment services.

My responsibilities included:

• Application development
• System architecture
• Database design
• User interface development
• Deployment
• Technical documentation

• Ahsan Habib — Application, architecture, database, UI, deployment, and documentation
• Md. Saiful Islam — Automated testing, manual regression, production smoke testing, and defect reporting

The core architecture followed this flow:

Next.js Route
    → Service
        → Repository
            → PostgreSQL RPC
                → Accounts + Append-Only Double-Entry Ledger

Financial values were stored as bigint poisha, and financial writes were executed atomically in PostgreSQL.

The architecture was designed so that cached account balances must always reconcile with the underlying ledger.

• Next.js 16 App Router
• React 19
• TypeScript
• Tailwind CSS v4
• shadcn/ui
• Supabase PostgreSQL
• Supabase Auth
• Supabase Storage
• Docker-based local Supabase stack
• Vitest
• Playwright
• Vercel

A major focus of BanglaPay was maintaining strong financial consistency and security principles.

The project emphasized:

• Atomic financial transactions
• Double-entry accounting
• Ledger reconciliation
• Idempotency
• Concurrency safety
• Secure authentication
• Controlled device access
• Structured testing

The hackathon provided an opportunity to design, build, test, and present a complete financial simulation system within a competitive environment.

It required making careful architectural decisions while balancing development speed, security, reliability, user experience, and presentation quality.

The complete project source code and documentation are available on GitHub:

View BanglaPay on GitHub