Hi, I'm Rahatutzaman Rizon
I build multi-tenant ERP, CRM, and SaaS platforms — combining robust full-stack engineering with data analysis, SQL performance tuning, and AI-powered workflow automation.
const fullStackDev = {
name: "Rahatutzaman Rizon",
core: ["React", "Next.js", "Node.js"],
systems: "Multi-Tenant ERP & SaaS",
aiIntegration: true, // RAG Search
};
Full Stack Engineering & Data Analytics Excellence
A look into my background, core metrics, technical capabilities, and spoken languages.
Experience
Building production ERP, SaaS & Analytics apps
Problem Solving
Solved on LeetCode, CodeChef & Beecrowd
SQL Optimization
Database speed & query execution boost
B.Sc. CGPA
Information & Communication Technology
Full Stack & Systems Background
I'm a Full Stack Software Engineer and Data Analyst with 2+ years of hands-on experience designing enterprise-grade multi-tenant ERP, CRM, data dashboards, and database-driven web applications.
My technical expertise spans Full Stack Development (React.js, Next.js, Node.js, Express, TypeScript) and Data Analytics & BI (SQL query optimization, Python Pandas/NumPy, data visualization, ETL, and automated reporting). I specialize in end-to-end solutions — from multi-tenant access control to database tuning that boosts query speed by +45%.
Over my career, I've delivered mission-critical travel ERP modules (Flight, Hotel, Visa, Umrah, Accounts, Refund), interactive analytics dashboards, custom Shopify integrations, and AI document retrieval engines.
Mawlana Bhashani Science and Technology University (2019–2024)
Core Technical Strengths
"I believe engineering is about clean abstractions, predictable state, robust data pipelines, and continuous query optimization."
Spoken Languages & Communication
Multilingual communication capabilities for global collaboration and cross-cultural engineering teams.
English
EnglishFluent engineering communication, technical documentation, and client collaboration.
Bangla
বাংলাNative language proficiency with complete mastery in spoken and written communication.
Hindi
हिन्दीFluent spoken communication and cross-cultural technical team collaboration.
Spanish
EspañolConversational fluency and active skill development for international teams.
Skills & Enterprise Tech Stack
A breakdown of technologies, frameworks, databases, and domain specializations I work with daily.
Business Analysis & Systems
Enterprise requirements gathering, process workflow mapping, BRD/PRD documentation, and solution specification.
Data Analysis & Business Intelligence
Statistical data analysis, relational query optimization, interactive visualization dashboards, and business reporting.
Languages
Core programming and database query languages used for application logic.
Frontend Development
Modern, responsive, and performance-focused UI engineering tools.
Backend & APIs
Scalable server architectures, microservices, and secure API gateways.
Databases & Architecture
Multi-tenant data isolation, relational & document schema design, and query optimization.
Business Domains & ERP
Specialized experience building enterprise modules for core business processes.
Shopify Development
Custom e-commerce solutions, storefront custom features, and API integrations.
AI & Automation
Integrating intelligent contextual agents, vector search, and background automation.
DevOps & Cloud Tools
CI/CD pipelines, containerization, deployment monitoring, and cloud hosting.
Core Computer Science
Theoretical foundation, clean code practices, and system engineering principles.
Enterprise AI Workflows & RAG Suite
Explore live interactive demonstrations of automated knowledge base indexing, access-control RAG, multi-agent handoffs, and structured JSON document extraction.
Access-Control-Aware RAG Engine
Enforces multi-tenant metadata filtering prior to vector similarity retrieval so users only see context authorized for their role.
Professional Work Experience
A chronological timeline of my engineering roles, enterprise contributions, and shipped production platforms.
Software Engineer
Engineered high-scale multi-tenant enterprise ERP systems, travel booking engines, financial accounts, and AI/RAG workflow automations.
Key Responsibilities & Deliverables:
- Developed multi-tenant travel ERP modules covering Flight, Hotel, Visa, Work Visa, Umrah, Tour, CRM, B2B, Accounts, Payment, Invoice, Refund, and Reporting workflows.
- Built and maintained core SaaS products FTO Travels and FlightTrip using React.js, Next.js, Node.js, Express, REST APIs, and MongoDB.
- Implemented complex booking state machines, multi-tier Role-Based Access Controls (RBAC), credit balance handling, payment gateways, and auto-generated PDF invoices.
- Managed multi-tenant database isolation, data migrations, Azure Portal cloud resources, Azure DevOps CI/CD pipelines, and Docker container deployments.
- Engineered B2B agent portals, account ledgers, transaction management, real-time dashboards, and AI/RAG document automation features.
- Successfully launched multi-tenant architecture supporting independent data segregation and customizable brand workflows for travel agency tenants.
- Automated complete invoice-to-receipt processing pipeline, reducing manual financial audit time by over 60%.
- Pioneered internal RAG (Retrieval-Augmented Generation) document retrieval feature for rapid knowledge lookup across complex travel rules.
Junior Software Developer
Built enterprise ERP/CRM modules, custom Shopify e-commerce extensions, property tech applications, and client solutions for international clients.
Key Responsibilities & Deliverables:
- Developed modular ERP, CRM, property management, tenant leasing, account settlement, payment tracking, and executive dashboard modules.
- Engineered custom Shopify storefront features, product catalog customizations, order workflows, and REST API integrations.
- Delivered major frontend UI and application speed improvements for Canadian client Nucleus Institute.
- Built secure CRUD operations, JWT authentication flows, customizable reporting views, and a library of reusable UI components.
- Delivered client project Nucleus Institute ahead of schedule with 95+ mobile performance score.
- Created reusable React UI component library used across 3 distinct client projects, speeding up dev velocity by 30%.
Software Engineering Intern
Supported enterprise backend software development, database query optimization, system API testing, and Git collaborative workflows.
Key Responsibilities & Deliverables:
- Supported enterprise product development, automated API regression testing, bug debugging, and system documentation.
- Optimized complex SQL queries, indexes, and database execution plans to reduce query latency.
- Collaborated using Git branch strategies, code reviews, and Agile daily standup sprints.
- Optimized heavy enterprise SQL queries, improving execution speed by approximately 45%.
- Authored comprehensive API documentation and test suites adopted by incoming developers.
Production ERPs, SaaS & AI Innovations
Explore multi-tenant platforms, AI search engines, and enterprise web solutions built for real businesses.
Enterprise AI Agent & RAG Suite
Auto-Indexing RAG, Access-Control RAG, Multi-Agent Handoffs & Observability
Production-grade enterprise AI agent suite featuring automated knowledge base re-indexing, RBAC access-control RAG, confidence scoring, fallback model chains, LangSmith-style tracing, and structured JSON extractions.
FTO Travels
Enterprise Multi-Tenant Travel ERP & Booking Engine
Comprehensive multi-tenant travel ERP platform covering Flight, Hotel, Visa, Umrah, CRM, B2B Agent Portals, Accounts, and automated payment/invoicing.
FlightTrip Platform
Multi-Tenant Flight & Hotel Booking SaaS
Scalable B2B/B2C travel platform providing real-time flight search, hotel room selection, visa workflow management, and payment gateway integration.
AI / RAG Enterprise Automation System
Knowledge Search & AI-Powered Workflow Engine
Retrieval-Augmented Generation system enabling contextual document search, automated policy lookup, email response generation, and workflow automation.
Nucleus Institute Platform
High-Performance Canadian Education Web Platform
Responsive education website delivering clean course structures, fast page loads, interactive contact modules, and optimized content delivery.
Shopify Custom Merchant Suite
Custom E-Commerce Storefront & Order Integration
Custom Shopify storefront extension, REST API sync engine, inventory tracking, and specialized order fulfillment workflows.
Property & Tenant ERP SaaS
Lease Management, Rent Ledger & Account Engine
Property management platform handling tenant leasing, rent ledger automation, maintenance requests, and landlord balance dashboards.
Let's Build Something Scalable Together
Have a project in mind, need a full stack engineer, or want to discuss multi-tenant ERPs & AI integrations? Drop a message!