
Rian Rashaduzamman
Verified Expert in Engineering
Full-stack Developer
Dhaka, Dhaka Division, Bangladesh
Toptal member since March 12, 2026
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
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
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.
AI Integration Developer | WhatsApp API
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.
Senior Back-end Leader
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.
Senior Back-end Developer
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.
Mid-level Back-end Developer
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.
Experience
AI Call Center Automation | Hellokit
https://hellokit.nextcombinator.comI 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.comI 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.aiI 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 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 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.bdThe 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
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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