Rian Rashaduzamman, Developer in Dhaka, Dhaka Division, Bangladesh
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Rian Rashaduzamman

Full-stack Developer

Dhaka, Dhaka Division, Bangladesh

Toptal member since March 12, 2026

Bio

Rian is a full-stack developer with 8+ years of experience building scalable web and mobile applications. He specializes in Node.js, React, and modern back-end architectures, with strong expertise in APIs, real-time systems, and AI-powered applications. Rian has developed complex SaaS platforms, automation tools, and AI solutions, delivering high-performance products for startups and growing businesses.

Portfolio

Next Combinator
Agentic AI, Agentic Frameworks, Agentic RAG Systems, AI Agents, AI CRM, AI SDK...
Global Healthcare Company
AI Agents, WhatsApp API, Voice Chat, WhatsApp Business, Django, Agentic AI...
Shothik AI
JavaScript, Python 3, MongoDB, PostgreSQL, AI Agents, Agentic AI, RAG Systems...

Experience

  • JavaScript - 8 years
  • Node.js - 8 years
  • MongoDB - 7 years
  • Generative Artificial Intelligence (GenAI) - 4 years
  • AI Voice Agents - 4 years
  • AI Agents - 4 years
  • Agentic RAG Systems - 4 years
  • LangChain - 3 years

Preferred Environment

MacOS

The most amazing...

...thing I've developed is an AI-powered SaaS platform combining intelligent automation, real-time analytics, and scalable systems.

Work Experience

Senior Full-stack Product Engineer

2026 - PRESENT
Next Combinator
  • Architected and developed core back-end services for an AI-powered mobile app builder, enabling users to generate functional mobile applications from natural language prompts using Node.js and AI orchestration pipelines.
  • Designed and implemented an AI video generation platform that automates script generation, scene planning, and video composition using LLM workflows and integrated media processing services.
  • Built scalable API-driven infrastructure integrating AI models, automation pipelines, and database services to support high-throughput content generation and real-time user interactions.
  • Developed agentic AI workflows that translate user prompts into structured application logic, UI layouts, and back-end configurations for rapid mobile application prototyping.
  • Optimized performance and system reliability by implementing modular back-end architecture, async processing pipelines, and efficient database interactions for AI-powered features.
Technologies: Agentic AI, Agentic Frameworks, Agentic RAG Systems, AI Agents, AI CRM, AI SDK, AI Tools, AI Voice Agents, API Architecture, API Integration, APIs, Architecture, Artificial Intelligence (AI), Chatbots, Claude Agent SDK, Claude, Node.js, React, React Native, Next.js, JavaScript, Python, Express.js, Expo, MongoDB, Prisma, SQL, PostgreSQL, Voice Chat, WhatsApp Business, AI Automation, Software Architecture, Solution Architecture, Microservices, Anthropic, Cybersecurity, System Architecture, Automations, Dashboards, Integration, Reports, Workflows, B2C, AI-generated Code, CRM, Cloud Infrastructure, Database Design, Early-stage Startups, Data Science, OpenAI, Azure, Microsoft 365, Microsoft Teams, Front-end, DOM, Databases, Ubuntu, Scraping, Web Scraping, Large Language Models (LLMs), Playwright, Puppeteer, Text Categorization, Scrapy, Text Classification, AI Integration, Amazon S3 (AWS S3), Deployment, End-to-end Implementation (E2E), Minimum Viable Product (MVP), UI Development, OpenAI GPT-4 API, Event-driven Programming, Message Queues, Amazon Web Services (AWS), ChatGPT, Marketplaces, Web Development, GitHub Workflows, Startups, AI Agent Orchestration, AI Architecture, Eclipse Gemini, Gemini, Gemini API, GitHub, Postmark, Redis, SendGrid, Crowdfunding, Mapbox, Payment APIs, Best Practices, Consulting, Large-scale Projects, Load Testing, Performance Optimization, Problem Solving, Scalable Architecture, Tailwind CSS, Text-to-Speech (TTS), Vite, NPM, ECMAScript (ES6), Pinia, IT Security, RAG Pipelines, Tailwind UI, FastAPI, Large Language Model Operations (LLMOps), MacOS, JSON REST APIs, Microsoft, AI Product Management, Technical Project Management, Agile, Data Pipelines, Auth0, Automation, Mobile First, Web App Development, Responsive, Google Antigravity, Quality Assurance (QA), Amazon Cognito, SMS, Electron, Supabase Auth, Third-party APIs, Third-party Integration, Twilio API, Workflow Automation, Open-source LLMs, Facebook API, Instagram API, nanobanana, Metagraph, Back-end, RAG Architecture, AI Chatbots, Webhooks, DevOps, Multi-tenant Architecture, Model Context Protocol (MCP), Amazon Bedrock, AI Avatars, Amazon CloudFront, MVP Design, VoIP Administration

AI Integration Developer | WhatsApp API

2026 - 2026
Global Healthcare Company
  • Developed a scalable WhatsApp integration system using Meta Cloud API, enabling real-time AI-driven conversations and automated user interactions for a SaaS platform.
  • Designed and implemented a webhook-based messaging pipeline with asynchronous processing, improving system reliability and handling concurrent user requests efficiently.
  • Built an agent bridge layer to connect AI agents with WhatsApp, enabling seamless message transformation, context handling, and multi-channel communication support.
  • Implemented automated check-in workflows and template-based messaging, increasing user engagement and ensuring compliance with WhatsApp’s 24-hour messaging policies.
  • Created a monitoring and logging system to track message delivery, failures, and user activity, improving debugging efficiency and overall system observability.
  • Collaborated with cross-functional teams to define AI interaction flows and optimize user experience for a well-being and career-focused platform.
  • Integrated external AI agents with back-end services, ensuring secure API communication, low-latency responses, and scalable architecture design.
Technologies: AI Agents, WhatsApp API, Voice Chat, WhatsApp Business, Django, Agentic AI, AI Agent Orchestration, Agentic Frameworks, Webhooks, Meta APIs, Facebook API, Back-end, RAG Architecture, AI Chatbots, DevOps, Multi-tenant Architecture, Model Context Protocol (MCP), Amazon Bedrock, AI Avatars, Amazon CloudFront, MVP Design

Senior Back-end Leader

2024 - 2026
Shothik AI
  • Architected and deployed production-grade agentic AI systems using LangGraph for complex multi-agent workflows, enabling autonomous decision-making.
  • Developed advanced RAG pipelines integrating Pinecone and Chroma vector databases with embedding models, achieving 85% relevance accuracy.
  • Delivered AI solutions for civil engineering, banking, and SaaS platforms, enabling intelligent automation and data-driven decision-making.
Technologies: JavaScript, Python 3, MongoDB, PostgreSQL, AI Agents, Agentic AI, RAG Systems, LangChain, LangGraph, VoiceBot, Chatbots, Agentic Frameworks, Vector Data, Artificial Intelligence (AI), Large Language Models (LLMs), TypeScript, React, Python, API Architecture, API Integration, Full-stack Development, Security, Claude Code, WhatsApp API, Supabase, n8n, Kubernetes, CSS, HTML, AI Tools, Claude, Cursor AI, MySQL, Replit, Prompt Engineering, Workflow, Workflow Automation & System Integration, REST APIs, Test-driven Development (TDD), Retrieval-augmented Generation (RAG), AI Voice Agents, AI CRM, Authentication, Clean Architecture, Dependency Injection, Domain-driven Design (DDD), Express.js, Middleware, Repository Pattern, Role-based Access Control (RBAC), Technical Leadership, Vercel, Claude Agent SDK, Voice Chat, WhatsApp Business, AI Automation, Software Architecture, Solution Architecture, Chrome Extensions, Microservices, Next.js, Anthropic, Cybersecurity, System Architecture, Automations, Dashboards, Integration, Reports, Workflows, B2C, CRM, Cloud Infrastructure, Database Design, Early-stage Startups, Data Science, Salesforce, OpenAI, Microsoft 365, Microsoft Teams, Perplexity, Front-end, DOM, Databases, Ubuntu, Scraping, Web Scraping, Algorithms, Categorization, Classification, Playwright, Puppeteer, Text Categorization, Scrapy, Text Classification, AI Integration, Amazon S3 (AWS S3), Deployment, Audio, End-to-end Implementation (E2E), Minimum Viable Product (MVP), UI Development, OpenAI API, OpenAI GPT-4 API, Event-driven Programming, Message Queues, Google Cloud, Amazon Web Services (AWS), Avatars, ChatGPT, Marketplaces, Google Cloud Platform (GCP), Web Development, GitHub Workflows, Startups, Manus, AI Agent Orchestration, AI Architecture, CRM APIs, Eclipse Gemini, Gemini, Gemini API, Datadog, GitHub, GoHighLevel, LinkedIn API, Postmark, Railway, Redis, SendGrid, Crowdfunding, Mapbox, OAuth, Payment APIs, Best Practices, Consulting, Large-scale Projects, Load Testing, Performance Optimization, Problem Solving, Scalable Architecture, Tailwind CSS, Text-to-Speech (TTS), Vite, NPM, ECMAScript (ES6), Pinia, Vue, IT Security, RAG Pipelines, Tailwind UI, TypeORM, Talkdesk, FastAPI, Large Language Model Operations (LLMOps), MacOS, JSON REST APIs, Microsoft, AI Product Management, Technical Project Management, Agile, Scrum, Data Pipelines, Auth0, Automation, Mobile First, Web App Development, Responsive, Google Antigravity, Quality Assurance (QA), Amazon Cognito, SMS, Electron, Supabase Auth, ERP Systems, Third-party APIs, Third-party Integration, Twilio API, Workflow Automation, Open-source LLMs, Facebook API, Instagram API, nanobanana, Fitness, Metagraph, Amazon Textract, Bots, Zapier, Voiceflow, Back-end, RAG Architecture, Laravel, PHP, Google Ads API, AI Chatbots, Webhooks, DevOps, Multi-tenant Architecture, SOC 2, Amazon Bedrock, AI Avatars, Amazon CloudFront, HeyGen, MVP Design

Senior Back-end Developer

2023 - 2024
Skills Growth Academy
  • Developed an online learning management platform enabling students to access courses, track progress, and complete assessments through a scalable web system.
  • Implemented AI-powered content recommendations to suggest personalized learning paths based on student progress and performance.
  • Implemented secure video streaming infrastructure to deliver course lectures with adaptive playback and optimized bandwidth usage.
Technologies: Node.js, JavaScript, Python 3, AI Agents, MongoDB, React Native, RAG Systems, TypeScript, React, API Architecture, API Integration, Full-stack Development, Security, Supabase, CSS, HTML, AI Tools, Cursor AI, Prompt Engineering, Workflow Automation & System Integration, REST APIs, Test-driven Development (TDD), Apache Kafka, Retrieval-augmented Generation (RAG), LangChain, VoiceBot, Authentication, Clean Architecture, Dependency Injection, Domain-driven Design (DDD), Express.js, Middleware, Repository Pattern, Role-based Access Control (RBAC), Technical Leadership, Vercel, AI Automation, Software Architecture, Solution Architecture, Chrome Extensions, Microservices, Next.js, Cybersecurity, System Architecture, Automations, Dashboards, Integration, Reports, Workflows, CRM, Cloud Infrastructure, Database Design, Early-stage Startups, Salesforce, Azure, Microsoft 365, Microsoft Teams, Front-end, DOM, Databases, Ubuntu, Scraping, Web Scraping, Python, Large Language Models (LLMs), Playwright, Puppeteer, Scrapy, AI Integration, Deployment, End-to-end Implementation (E2E), Minimum Viable Product (MVP), UI Development, OpenAI API, Event-driven Programming, Message Queues, Amazon Web Services (AWS), Marketplaces, Web Development, Financial UX, GitHub Workflows, Training, AI Agent Orchestration, AI Architecture, CRM APIs, Gemini, Gemini API, GitHub, Redis, SendGrid, Payment APIs, Best Practices, Large-scale Projects, Load Testing, Performance Optimization, Problem Solving, Scalable Architecture, Tailwind CSS, Vite, NPM, ECMAScript (ES6), Pinia, IT Security, Tailwind UI, TypeORM, FastAPI, Large Language Model Operations (LLMOps), MacOS, JSON REST APIs, Microsoft, AI Product Management, Technical Project Management, Data Pipelines, Auth0, Automation, Mobile First, Web App Development, Responsive, Quality Assurance (QA), Amazon Cognito, SMS, Electron, Supabase Auth, ERP Systems, Third-party APIs, Third-party Integration, Twilio API, Workflow Automation, Facebook API, Back-end, Laravel, PHP, Google Ads API, DevOps, Multi-tenant Architecture, Amazon CloudFront, MVP Design

Mid-level Back-end Developer

2018 - 2022
FIFO Tech
  • Developed scalable back-end services using Node.js and MongoDB, powering high-traffic web applications and improving API response performance.
  • Developed full-stack web applications using React, Node.js, and modern JavaScript frameworks for enterprise and startup clients.
  • Built scalable back-end services and APIs powering a high-traffic SaaS ERP platform serving 500,000+ daily users.
Technologies: JavaScript, Node.js, Python 3, MongoDB, PostgreSQL, RESTFul APIs, React, React Native, Socket.IO, APIs, Docker, Full-stack, Next.js, TypeScript, API Architecture, API Integration, Full-stack Development, eCommerce, Security, Headless Commerce, Supabase, CSS, HTML, MySQL, REST APIs, Authentication, Clean Architecture, Dependency Injection, Domain-driven Design (DDD), Express.js, Healthcare, Middleware, Repository Pattern, Role-based Access Control (RBAC), HubSpot, Directus, Software Architecture, Solution Architecture, Chrome Extensions, Microservices, Cybersecurity, System Architecture, Automations, Dashboards, Integration, Reports, CRM, Cloud Infrastructure, Database Design, Statistics, Salesforce, Google Sheets, Microsoft 365, Microsoft Teams, Xero, Front-end, DOM, Databases, Ubuntu, Scraping, Web Scraping, Python, AI Integration, Deployment, End-to-end Implementation (E2E), Minimum Viable Product (MVP), UI Development, Event-driven Programming, Insurance Technology (Insurtech), Web Development, Financial UX, GitHub Workflows, Training, CRM APIs, GitHub, Redis, Best Practices, Large-scale Projects, Load Testing, Performance Optimization, Problem Solving, Scalable Architecture, NPM, ECMAScript (ES6), Pinia, Vue, IT Security, Tailwind UI, TypeORM, JSON REST APIs, Microsoft, Technical Project Management, Web App Development, Responsive, ERP Systems, Third-party APIs, Third-party Integration, Back-end, Laravel, PHP, DevOps, Multi-tenant Architecture, VoIP, VoIP Administration

Experience

AI Call Center Automation | Hellokit

https://hellokit.nextcombinator.com
Developed an AI-powered call center automation platform integrating intelligent IVR, custom SIP infrastructure, and adaptive CRM systems to automate customer support and sales workflows. The system utilizes multi-agent AI workflows built with LangGraph to handle real-time call routing, sentiment analysis, and automated response generation. I implemented natural language understanding for conversational IVR interactions, enabling context-aware menu navigation and dynamic responses.

I engineered a scalable telephony infrastructure supporting both cloud and on-premise deployments, integrating Twilio APIs and custom SIP servers for seamless call management. I also integrated Whisper for speech-to-text processing, enabling real-time transcription, call summarization, and quality monitoring. The platform also includes predictive lead scoring, automated ticket classification, and AI-driven customer insights.

I built real-time streaming and agent collaboration using WebSocket architecture to enhance conversational AI experiences, supporting multi-language interactions and adaptive learning from historical call data.

Infection Control IQ

https://infectioncontroliq.com
Developed an AI-powered infection prevention intelligence platform designed to help healthcare professionals quickly access verified infection control guidance and regulatory requirements. The system uses advanced AI and retrieval pipelines to analyze large collections of IPAC guidelines and deliver precise, evidence-backed answers in seconds.

I implemented semantic document retrieval and knowledge indexing to process thousands of infection control documents, enabling contextual search and intelligent recommendations for hospitals, clinics, and healthcare administrators. The platform provides source-backed responses, regulatory updates, and policy-building tools to help organizations maintain compliance and improve infection control practices.

I also built scalable back-end services and AI-powered search pipelines to transform fragmented healthcare guidance into structured, searchable intelligence. The platform also includes automated checklist generation, policy templates, and real-time update tracking to help infection control teams stay aligned with evolving standards.

AI-powered Construction Intelligence & Automation Platform

https://edapro.ai
I developed an AI-powered platform for civil engineering and construction companies that automates project documentation and compliance workflows. The system converts architectural designs into structured bill of quantities (BOQ), generates AI-assisted inception reports, and provides agentic AI chat capabilities for project analysis and regulatory guidance.

I designed and implemented the back-end architecture using Node.js and modern AI tooling, enabling RAG-based knowledge retrieval from construction standards and project data. The platform includes AI agents that help engineers generate compliance reports, validate BOQ structures, and interactively analyze project documentation through conversational interfaces. This significantly reduces manual documentation time and improves accuracy for engineering teams handling complex infrastructure projects.

AI-powered Meta Marketing Automation Platform

I developed an AI-driven marketing automation platform that integrates with Meta APIs to manage and optimize ad campaigns at scale. The system analyzes campaign performance data, generates AI-based recommendations, and automates actions such as updating creatives, adjusting budgets, and pausing underperforming ads.

I built scalable back-end services using Node.js to handle data ingestion, processing, and real-time decision-making. The platform also includes automation workflows for campaign creation, audience targeting, and performance monitoring. This solution helps businesses improve ROI by reducing manual intervention and enabling data-driven marketing strategies.

Omnichannel AI Chatbot Platform (WhatsApp, Instagram, Messenger, Web)

I built a multi-channel AI chatbot platform that integrates with WhatsApp Business API, Instagram, Messenger, and web chat to automate customer interactions. The system uses LLM-based AI agents to handle conversations, perform intent detection, and trigger backend workflows such as lead generation, CRM updates, and customer support automation.

I designed the back-end architecture using Node.js with webhook-based event handling and real-time messaging pipelines. The platform supports proactive messaging, automation workflows, and compliance with Meta messaging policies. It enables businesses to manage customer communication across multiple channels from a unified system.

My Doctor

https://mydoctor.com.bd
I developed a scalable, AI-powered healthcare platform for My Doctor, a Bangladesh-based digital health service provider offering telemedicine, diagnostics, and emergency services.

The platform enables users to book doctor consultations (online and video), request ambulance services, access diagnostic facilities, and receive prescriptions digitally. It also supports home healthcare services such as physiotherapy and sample collection.

A key innovation in this system is the integration of an AI-driven medical report analysis engine, which processes diagnostic reports and provides structured insights, summaries, and potential risk indicators. This helps both patients and healthcare providers better understand medical data and make faster, more informed decisions.

I architected and implemented the back-end system using Node.js, focusing on scalability, performance, and secure handling of sensitive healthcare data. Additionally, I designed intelligent workflows that automate service coordination and enhance the overall patient journey.

This solution transforms traditional healthcare delivery by combining digital services with AI-powered insights, improving accessibility, efficiency, and decision-making.

Education

2014 - 2017

Bachelor's Degree in Computer Science

University of Asia Pacific - Dhaka, Bangladesh

Skills

Libraries/APIs

Node.js, React, Claude API, REST APIs, Playwright, Puppeteer, OpenAI API, Stripe, Twilio API, Facebook API, Instagram API, Google Ads API, WhatsApp API, LinkedIn API, Vue, Socket.IO

Tools

AI SDK, Claude Code, n8n, Claude, Claude Agent SDK, Microsoft Teams, ChatGPT, GitHub, NPM, Auth0, Amazon Textract, Zapier, Amazon CloudFront, Retell AI, Google Sheets, Xero, Codex, SendGrid, Amazon Cognito, Asterisk, Expo, Prisma

Languages

JavaScript, Python, TypeScript, CSS, HTML, ECMAScript (ES6), PHP, GraphQL, Python 3, SQL

Frameworks

React Native, Agentic Frameworks, LangGraph, Next.js, Express.js, Scrapy, Tailwind CSS, Electron, Laravel, Eclipse Gemini, Django

Paradigms

API Architecture, Test-driven Development (TDD), Clean Architecture, Dependency Injection, Role-based Access Control (RBAC), Microservices, B2C, Database Design, Event-driven Programming, Best Practices, Load Testing, Agile, Scrum, Automation, Responsive, DevOps, Model Context Protocol (MCP), HIPAA Compliance

Platforms

MacOS, Docker, Twilio, HubSpot, Ubuntu, Amazon Web Services (AWS), Google Cloud Platform (GCP), Mapbox, Talkdesk, Voiceflow, Kubernetes, Replit, Apache Kafka, Vercel, Directus, Salesforce, Azure, GoHighLevel, Microsoft

Storage

MongoDB, PostgreSQL, Databases, Amazon S3 (AWS S3), Redis, Data Pipelines, MySQL, Google Cloud, Datadog

Industry Expertise

Healthcare, Cybersecurity

Other

SaaS, Generative Artificial Intelligence (GenAI), Agentic RAG Systems, Retrieval-augmented Generation (RAG), AI Agents, AI Voice Agents, LangChain, RAG Systems, Agentic AI, Chatbots, APIs, Full-stack, Artificial Intelligence (AI), Large Language Models (LLMs), API Integration, Full-stack Development, Architecture, eCommerce, Security, Headless Commerce, Supabase, AI Tools, Cursor AI, Workflow Automation & System Integration, Authentication, Domain-driven Design (DDD), Middleware, Repository Pattern, Technical Leadership, WhatsApp Business, AI Automation, Software Architecture, Solution Architecture, Chrome Extensions, AI Chatbots, Anthropic, System Architecture, Automations, Dashboards, Integration, Reports, Workflows, AI-generated Code, CRM, Cloud Infrastructure, Early-stage Startups, Statistics, OpenAI, Front-end, DOM, Scraping, Web Scraping, Antibot Bypasses, PDF Scraping, Text Categorization, Text Classification, AI Integration, Deployment, Audio, End-to-end Implementation (E2E), Minimum Viable Product (MVP), UI Development, OpenAI GPT-4 API, Message Queues, Avatars, Marketplaces, Web Development, Financial UX, GitHub Workflows, Training, Startups, AI Agent Orchestration, AI Architecture, CRM APIs, Gemini, Gemini API, Postmark, Railway, OAuth, Payment APIs, Consulting, Large-scale Projects, Performance Optimization, Problem Solving, Scalable Architecture, Text-to-Speech (TTS), Vite, Pinia, IT Security, RAG Pipelines, Tailwind UI, TypeORM, FastAPI, Large Language Model Operations (LLMOps), JSON REST APIs, AI Product Management, Technical Project Management, Mobile First, Web App Development, Google Antigravity, Quality Assurance (QA), Magic Link, Epic, SMS, Supabase Auth, ERP Systems, Third-party APIs, Third-party Integration, Workflow Automation, Open-source LLMs, nanobanana, Fitness, Metagraph, Bots, Webhooks, Back-end, Electronic Medical Records (EMR), RAG Architecture, Multi-tenant Architecture, SOC 2, Amazon Bedrock, AI Avatars, HeyGen, MVP Design, VoIP, VoIP Administration, ElevenLabs Solutions, Prompt Engineering, Workflow, Voice Chat, Data Science, Microsoft 365, Perplexity, Algorithms, Categorization, Classification, Insurance Technology (Insurtech), Manus, Crowdfunding, HIPAA, VoiceBot, Vector Data, AI CRM, Custom CRM Modules, SIP, RESTFul APIs, Facebook, Business Logic, Messenger, WhatsApp, Meta Ads, Meta APIs

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