Full Stack Software Engineer with 2+ years building and scaling multi-tenant ERP, CRM, SaaS, B2B, booking, payment, and Shopify platforms for production travel and business-automation systems.
const fullStackDev = {
name: "Rahatutzaman Rizon",
core: ["React", "Next.js", "Node.js"],
systems: "Multi-Tenant ERP & SaaS",
aiIntegration: true, // RAG Search
};
A look into my background, core metrics, technical capabilities, and spoken languages.
Building production ERP, SaaS, CRM & B2B platforms
Solved across LeetCode, CodeChef & Beecrowd
MongoDB, MySQL, PostgreSQL & Schema Design
Information & Communication Technology
I'm a Full Stack Software Engineer with 2+ years of hands-on experience building and scaling multi-tenant ERP, CRM, SaaS, B2B, booking, payment, and Shopify platforms for production travel and business-automation systems.
My technical skills span JavaScript, TypeScript, React.js, Next.js, Node.js, MongoDB, SQL, REST APIs, testing, Docker, Azure DevOps, and CI/CD. I specialize in designing business logic, domain workflows, RBAC-driven multi-tenant architectures, and AI/RAG-powered document retrieval and workflow automation for real-world clients.
At Implevista, I develop and maintain a multi-tenant travel ERP spanning Flight, Hotel, Visa, Work Visa, Umrah, Tour, CRM, B2B, and Accounts modules, shipping key features for production platforms FTO Travels and FlightTrip.
Mawlana Bhashani Science and Technology University (2019–2024)
"I believe engineering is about clean abstractions, predictable state, robust data pipelines, and continuous query optimization."
Multilingual communication capabilities for global collaboration and cross-cultural engineering teams.
Fluent engineering communication, technical documentation, and client collaboration.
Native language proficiency with complete mastery in spoken and written communication.
Fluent spoken communication and cross-cultural technical team collaboration.
Conversational fluency and active skill development for international teams.
A breakdown of technologies, frameworks, databases, and domain specializations I work with daily.
Core programming languages for web, data analysis, and system architecture.
Modern UI engineering tools, component frameworks, and responsive design systems.
Server-side web frameworks, REST API design, authentication, and authorization.
Relational & NoSQL database management, document modeling, and query optimization.
Domain modeling and business logic implementation for enterprise platforms.
Artificial intelligence integration, RAG document search, and workflow automation.
Testing methodologies, containerization, CI/CD pipelines, and cloud platform deployment.
Core computer science principles, algorithmic problem solving, and software design.
Explore live interactive demonstrations of automated knowledge base indexing, access-control RAG, multi-agent handoffs, and structured JSON document extraction.
Enforces multi-tenant metadata filtering prior to vector similarity retrieval so users only see context authorized for their role.
A chronological timeline of my engineering roles, enterprise contributions, and shipped production platforms.
Develop and maintain multi-tenant travel ERP systems (Flight, Hotel, Visa, Work Visa, Umrah, Tour, CRM, B2B, Accounts), shipping features for FTO Travels and FlightTrip.
Developed ERP/CRM features, Shopify solutions, React interfaces, and REST APIs using React.js, Node.js, Express.js, and MongoDB.
Built foundational experience across software development, APIs, databases, testing, debugging, Git, and end-to-end development workflows.
Explore multi-tenant platforms, AI search engines, and enterprise web solutions built for real businesses.
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.
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.
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.
Knowledge Search & AI-Powered Workflow Engine
Retrieval-Augmented Generation system enabling contextual document search, automated policy lookup, email response generation, and workflow automation.
High-Performance Canadian Education Web Platform
Responsive education website delivering clean course structures, fast page loads, interactive contact modules, and optimized content delivery.
Custom E-Commerce Storefront & Order Integration
Custom Shopify storefront extension, REST API sync engine, inventory tracking, and specialized order fulfillment workflows.
Lease Management, Rent Ledger & Account Engine
Property management platform handling tenant leasing, rent ledger automation, maintenance requests, and landlord balance dashboards.
Formal university foundation alongside competitive programming and engineering impact.
Information and Communication Technology (ICT)
Mawlana Bhashani Science and Technology University • Tangail, Bangladesh
Comprehensive 4-year engineering curriculum focused on computer science fundamentals, software engineering, algorithms, database systems, networks, and advanced web technologies.
Solved 500+ algorithmic problems across LeetCode, CodeChef, and Beecrowd, mastering trees, graphs, dynamic programming, and greedy algorithms.
Architected and deployed multi-tenant travel ERPs (Flight, Hotel, Visa, Umrah, Accounts, Refunds, B2B Agent Portals) actively powering live travel agencies.
Engineered database indexing, schema transformations, and NoSQL document migrations at Business Automation Ltd, optimizing multi-tenant data boundaries.
Built document retrieval and vector embedding workflows that automate context lookup and customer service email generation inside enterprise software.
Automated rolling insights covering AI/RAG architectures, React Native mobile, NoSQL data migrations, and cloud systems.
Production AI teams are standardizing on metadata-filtered vector retrieval prior to similarity search, preventing cross-tenant data leaks in enterprise LLM workflows.
Role-based access control (RBAC) metadata filters ensure 100% tenant data isolation in LLM RAG pipelines.
React Native's new architecture defaults eliminate async serialization overhead, granting 60FPS UI thread performance across cross-platform iOS & Android apps.
Direct JSI memory sharing speeds up mobile app rendering and complex list animations.
Strategies for migrating high-velocity MongoDB collections and multi-tenant document schemas without locking database reads or interrupting production traffic.
Dual-write schema adapters enable seamless NoSQL version upgrades for multi-tenant SaaS.
Combining static shell rendering with dynamic server-streamed slots delivers sub-100ms first contentful paint (FCP) for web enterprise applications.
PPR delivers static CDN speed with live server dynamic data streaming.
In-memory column formats and WebSocket analytics streams empower business intelligence dashboards to process millions of rows directly in the browser.
Arrow memory formats cut web visualization data parsing overhead by over 70%.
Replacing brittle regex matchers with validated JSON schema enforcement allows enterprise web apps to automatically extract invoice data from PDFs.
Zod / Pydantic schema validation ensures zero-hallucination JSON extraction.
Have a project in mind, need a full stack engineer, or want to discuss multi-tenant ERPs & AI integrations? Drop a message!