Things I have built, shipped, researched, and learned from.

Digitized end-to-end customer onboarding for a national bank, in production since 27 September 2026 across all 189 branches and 1,224 sub-branches, from NID upload to account creation in the CBS.

• Retry-aware customer and joint-account creation with explicit handling of uncertain CBS outcomes.
• PostgreSQL-to-Oracle migration with reconciliation, rollback generation, and legacy-file access.

Published as a first-author journal article in IET Blockchain (2025) with 98% average integrity correctness across three radiology datasets.

• DNN-based feature hashing for compressed and original image consistency.
• AES-256 encryption before decentralized storage.

On 400 real test cards shared with consent, it reads 95.2% of Bangla names exactly (88.7% before adaptation) and 66.9% of full addresses (15.8% before), the most accurate of nine methods compared. 11,000 synthetic cards are released publicly.

• No real ID card and no personal record used in training.
• Compared against nine methods, including Tesseract, EasyOCR, and PaddleOCR-VL.

Live since 27 September 2026: customers can start account opening online from their own phone while maker-checker and BAMLCO compliance stays intact.

• In-browser liveness capture with verified-photo persistence and match-attempt logging.
• Nominee, guardian, introducer, and FATCA data capture.

A full learning product connecting job-exam preparation, handwritten answers, courses, and IELTS/SAT practice. Content generation is moderated; language-test AI evaluations can publish automatically, with exceptions routed to review.

• Private handwritten-answer uploads, transcription correction, and regrading instead of silently failing to zero.
• Server-owned IELTS/SAT section clocks, adaptive SAT routing, and versioned score reports.

One product spanning academy operations and venue rental: attendance devices, membership access, offline fee records, public availability search, booking squads, and SaaS administration. Payment records document money collected outside the app; they do not process payments.

• ZKTeco ADMS/PUSH attendance tied to tenant devices and member access.
• Hourly availability and database-enforced protection against double booking.

Contributed the speech and language R&D behind an automatic meeting-minutes product.

• ASR model research for transcription.
• LLM research for structured summarization.

Demonstrated semantic, conversational search over personal media.

• Natural-language photo queries.
• Embedding-based retrieval.

A deployable, Dockerized commerce stack covering the full customer and admin journey.

• Redis-backed cart with coupon application and delivery-fee rules.
• Guest checkout and order tracking by order number.

Standardized the bank's risk-based supervision reporting with a complete, auditable approval chain.

• Field, row, and report-level approval granularity.
• RSA-signed JWT auth with Active Directory (LDAP) login.

Delivered a full-stack product pattern covering questions, answers, user data, and protected content.

• Question and answer posting flows.
• MongoDB-backed persistence and API routes.

Demonstrated a practical mobile workflow for geofenced reminders and travel-aware notifications.

• Map-based alarm setup.
• Radius-based trigger concept.

Explored healthcare UX and service coordination through a mobile-first product.

• Appointment booking.
• Doctor availability flow.

Modeled a complete education workflow from teacher setup to student results.

• Teacher exam creation.
• Student submission flow.

Created a practical academic utility for repeated student use.

• Native Java Android implementation.
• UIU grading rules.