Systems Engineered for Scale, Safety & High Traffic.
Deep dives into real engineering challenges—explaining the client problem, architectural solution, technical trade-offs, and verified production outcomes.
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AI & Vector SearchDomain: International Maritime Shipping & Port State Control Compliance
Lead Systems Architect & Full-Stack AI Engineer
Maris AI — Maritime Port State Control (PSC) Advisory & Intelligence System
AI-native vector similarity search & bilingual RAG platform reducing vessel detention risks by over 60%.
The Client's Challenge / Problem:
Commercial ocean vessels calling at foreign ports face sudden detentions and severe financial penalties (tens of thousands of dollars per day) due to safety deficiencies during PSC inspections. Shipboard officers lack instant contextual intelligence to identify root causes and formulate corrective action plans before inspectors board.
The Architectural Solution:
Engineered an AI-native search and advisory platform integrating PostgreSQL pgvector (768-dimensional embeddings via Gemini text-embedding-004) with Meilisearch hybrid full-text search. Built a bilingual RAG (Retrieval-Augmented Generation) pipeline using Google Gemini AI to synthesize past deficiency precedents, IMO regulations, and actionable Root Cause Analysis (RCA) in both English and Bengali.
Key Architectural Highlights & Innovations:
768-dimensional vector cosine distance search across tens of thousands of historical IMO inspection records
Sub-second hybrid search combining typo-tolerant exact keyword matching with deep semantic similarity
Bilingual AI advisory engine enabling conversational English and Bengali technical queries
Dynamic detention risk scoring engine factoring vessel flag rating, age, and historical inspection alerts
Verified Production Impact & Result:Projected 60%+ reduction in ship detention risks, saving international fleet operators tens of thousands of dollars in port delay charges.
High-speed single-product checkout platform with AI courier fraud scoring and <1ms zero-token semantic assistant.
The Client's Challenge / Problem:
Multi-step e-commerce checkouts cause over 70% cart abandonment, while Cash-on-Delivery (COD) merchants suffer 25-35% return losses due to fake or impulsive orders. Non-technical business owners also struggled to generate operational insights from complex SQL dashboards.
The Architectural Solution:
Constructed an ultra-fast, multi-tenant single-product checkout engine with an Adaptive Hybrid Dual-UX. Built a proprietary Zero-Token Semantic Cache (AiSemanticCache) running at <1ms latency, an automated AI fraud risk-scoring algorithm (0-100), and automated bi-directional API integrations with courier networks (Steadfast, Pathao, RedX).
Key Architectural Highlights & Innovations:
Frictionless 1-step mobile checkout eliminating abandonment and boosting completion speed
Zero-Token Semantic Cache serving recurring conversational queries at <1ms with zero LLM API cost
Verified Production Impact & Result:+28% checkout conversion rate increase and 35% reduction in COD package return losses across tens of thousands of monthly shipments.
Event-driven WebSocket microservice delivering 50,000+ daily transactional notifications with 99.9% uptime and zero Meta fees.
The Client's Challenge / Problem:
Official WhatsApp Business Cloud APIs impose strict per-conversation billing, rigid template approvals, and lack flexible multi-session support for rapid-fire OTPs, delivery alerts, and order confirmations.
The Architectural Solution:
Architected an event-driven Node.js microservice utilizing the Baileys WebSocket protocol for multi-device authenticated connections. Implemented BullMQ distributed job queues backed by Redis to manage rate-limiting, exponential backoff retries, and socket auto-reconnection with failover resilience.
Key Architectural Highlights & Innovations:
Multi-session WebSocket connection manager with live QR stream authentication and state persistence
Distributed BullMQ queues with intelligent rate limiting to prevent WhatsApp account throttling
Bidirectional webhook dispatching for message delivery receipts, read statuses, and inbound replies
Full media streaming pipeline processing images, PDFs, voice notes, and documents via FFmpeg
Verified Production Impact & Result:99.9% uptime across continuous multi-session dispatches, handling 50,000+ daily notifications with zero per-message Meta fees.
Mission-critical government recruitment platform processing 100,000+ defense candidates with automated admit card generation.
The Client's Challenge / Problem:
National defense recruitment drives involve 100,000+ applicants competing for hundreds of posts under strict statutory quotas (Freedom Fighter, Tribal, District, Ansar). Manual applications caused administrative gridlock, lost documentation, and delayed examination timetables.
The Architectural Solution:
Built a high-availability examination processing portal. Engineered complex eligibility validation algorithms across age, educational degrees, and physical fitness parameters. Built automated national SMS broadcasting and batch PDF engines for barcode-equipped Admit Cards, exam seat plans, and merit tabulations.
Key Architectural Highlights & Innovations:
Dynamic post and statutory quota validation engine verifying candidate age down to the day
High-volume asynchronous document upload pipeline with client-side image resizing and compression
Batch PDF generation engine creating hundreds of thousands of tamper-resistant barcode admit cards
Multi-stage marks capture for Written, Physical, and Viva exams with automated weighted grading
Verified Production Impact & Result:Processed 100,000+ defense candidates with zero downtime; reduced recruitment administrative cycles from 6 months to several weeks.
Govt & EnterpriseDomain: International Mega-Projects (ADB), Public Health & Sanitation Infrastructure
Database Designer & Full-Stack System Developer
Asian Development Bank (ADB) & DPHE GIS Water & Infrastructure Monitoring System
GIS spatial mapping & biochemical water quality certification platform for multi-million dollar development projects.
The Client's Challenge / Problem:
Multi-million dollar emergency assistance programs in refugee camps and host communities faced severe tracking difficulties in monitoring decentralized water supply points, contractor milestone delivery, and lab water safety certifications.
The Architectural Solution:
Engineered an integrated GIS and progress management system tracking spatial water point coordinates, contractor engineering milestones, and water quality testing certifications. Integrated Firebase image acquisition for field inspection verification and financial expenditure tracking.
Key Architectural Highlights & Innovations:
Spatial GIS infrastructure mapping of water treatment plants, deep tube wells, and sanitation clinics
Firebase mobile image acquisition logging geo-tagged photos to verify field construction before invoicing
Gender Equality & Social Inclusion (GESI) compliance metrics for international development agencies
Verified Production Impact & Result:Delivered 100% audit transparency and real-time operational status for international funding agencies (ADB) and national ministries.
Govt & EnterpriseDomain: National Maritime Fleet Governance & International ISM Code Compliance
Enterprise Systems Developer & Architect
Bangladesh Shipping Corporation (BSC) Maritime Fleet Safety Management System
IMO & ISM Code enterprise maritime compliance portal ensuring 100% audit readiness across ocean-going fleets.
The Client's Challenge / Problem:
International maritime regulations under the International Safety Management (ISM) Code mandate strict safety and environmental procedures. Paper-based shipboard logbooks caused severe compliance delays and audit failures at foreign ports.
The Architectural Solution:
Designed a centralized maritime compliance portal mirroring onboard safety workflows. Implemented structured digital form builders for operational risk assessments, hazardous work permits (LOTO, hot work), near-miss reporting, and statutory manual revision tracking.
Key Architectural Highlights & Innovations:
Interactive digital Permit-to-Work forms for initial risk assessments and hazard mitigation
Official manual revision control (SEEMP, SOPEP) ensuring shore superintendents and captains share identical baselines
Hierarchical role security separating Designated Persons Ashore (DPA), Ship Masters, and Chief Engineers
Verified Production Impact & Result:Guaranteed 100% audit readiness across national merchant fleets during Port State Control inspections, eliminating maritime compliance detentions.
High-performance Next.js App Router platform built for international shipowner audits and low-bandwidth ocean connectivity.
The Client's Challenge / Problem:
Maritime crewing agencies require a lightning-fast, globally accessible web platform to satisfy international shipowner vetting audits and attract seafarers connecting over poor satellite internet connections.
The Architectural Solution:
Built a modern web application utilizing Next.js (App Router) with Server-Side Rendering (SSR) and Static Site Generation (SSG), styled with Tailwind CSS for top speed, accessibility, and high Core Web Vitals.
Key Architectural Highlights & Innovations:
Sub-second page delivery optimized for low-bandwidth satellite connections on vessels
Comprehensive seafarer online application pipeline with automated document uploads
Structured SEO metadata and JSON-LD schemas for top international search visibility
Verified Production Impact & Result:Reduced page loading times by over 70% and successfully passed rigorous international maritime partner compliance audits.
