
H M Naimuzzaman Shuvo
Verified Expert in Engineering
Full-stack Developer
Savar, Dhaka Division, Bangladesh
Toptal member since June 3, 2026
Senior Full Stack AI agent engineer with 7+ years shipping production software end to end; voice agents, banking automation, and real-time, data-heavy UI. Lead Frontend Engineer of a multi-million dollar Data Visualization & AI research company in the US; Founding Backend Engineer of a EU fintech platform connecting with 30+ European banks; Solutions Architect of a multi-tenant ERP POS solution serving 200+ businesses in India. I build the agent loop and the whole production system it runs on.
Portfolio
Experience
- Node.js - 7 years
- React - 7 years
- WebSockets - 7 years
- WebRTC - 7 years
- TypeScript - 7 years
- React Native - 6 years
- NestJS - 4 years
- AI Agents - 2 years
Preferred Environment
TypeScript, Node.js, React, React Native, NestJS, Prisma, Tailwind CSS, PostgreSQL, daisyUI, React Query
The most amazing...
...moment was when a restaurant's internet died mid-service, but the POS kept running. The offline desktop app I built with embedded Node.js and MariaDB worked.
Work Experience
AI Agent Engineer
Product Builders Academy
- Designed and shipped six production AI-agent systems in 2026 — voice tutors, a research agent, and an autonomous product-demo tool — owning each from the agent loop to the back end and deploying.
- Built Understudy: point it at any live web app and it auto-produces a narrated demo video, a guided tour, and an offline interactive sandbox; installs as a Claude Code / Cursor skill.
- Deployed a Bengali TTS stack — Fish-Speech S2 with zero-shot voice cloning on an RTX 3090 (patched SGLang-Omni to fit ~16 GB), after an earlier XTTS-v2 fine-tune — alongside real-time voice pipelines on LiveKit / Pipecat with sub-second latency tuning.
Lead Front-end in Data Visualization & AI Research
Datatailr
- Architected and built the full React 19 front end for a container orchestration platform (Docker jobs, DAG workflows)—20+ routes, 270+ modules—with type-safe Apollo GraphQL and REST API via codegen and validation with Zod.
- Shipped workflow visualization (DAG graph with React Flow and Dagre, Gantt with Recharts, ANSI log viewer) so users can inspect run topology, timing, and logs in one place.
- Built reusable DataGrid (sort, resize/reorder, context menu, pagination), cursor-based pagination with reset-on-filter, and URL-synced, Zod-validated filters for shareable list URLs.
- Established API-to-UI strong type safety using GraphQL Codegen and Orval for OpenAPI-to-React Query hooks and Zod, reducing runtime errors and accelerating feature development.
- Implemented role-based access (admin, developer, user), injectable navbar/footer, URL-driven UI action for deep-linkable modals.
- Improved performance with tiered polling, visibility-based polling, exponential backoff for Workspace Connect, and TanStack Query/Apollo defaults with targeted overrides.
Senior React Native Engineer
Neoke
- Built core features of Neoke's digital identity wallet for travelers, enabling secure storage and management of verifiable credentials, including passports, visas, and boarding passes.
- Developed full-stack functionality across the wallet's React Native and TypeScript front end and Node.js back end, working within W3C Verifiable Credentials and open identity standards.
- Implemented credential presentation and consent flows, allowing travelers to selectively share identity data with airlines and airports while retaining privacy control.
- Collaborated with a distributed EU-based team at a seed-funded identity startup validated through IATA pilots with major airlines and airports.
Founding Back-end Engineer in Fintech
Dynt
- Integrated GoCardless API for open banking services, providing secure accounts data access and payment initiation for customers across 30+ European banks and financial institutions.
- Engineered an automated invoice and bill processing system with OCR, decreasing processing time by 85% with detailed accuracy.
- Created a robust expense management system with real-time approval workflows, enabling efficient management of employee spending, streamlining expense management, and enhancing transparency for businesses.
- Developed a corporate card issuance system, utilizing Stripe's API for seamless generation and management of corporate payment cards.
- Introduced advanced automation workflows for categorization and reconciliation tools to match transactions seamlessly, reducing manual workload by 90%, enhancing efficiency in financial tracking, and ensuring accurate financial records.
ERP Solutions Architect
Possier
- Designed and implemented a cross-platform ERP POS management system with real-time data synchronization for 200+ clients single-handedly, enhancing efficiency and customer experience.
- Developed a robust offline ordering desktop app by embedding Node.js and MariaDB into a Windows binary, ensuring uninterrupted service and increasing the system’s reliability by 50%.
- Reduced AWS cloud operation costs by 70% and improved system performance by managing EC2, S3, and Lambda services.
- Integrated Stripe, Google Maps, and Twilio API to facilitate payments, location tracking, and SMS notifications.
Experience
Mr. Topper - real-time AI voice tutor
I architected and built end-to-end: a Python back end (FastAPI and Supabase) that orchestrates Pipecat bot subprocesses connected to LiveKit rooms for sub-second voice, with Gemini 3 Flash Preview as the LLM brain and Google Cloud TTS/STT for audio. The mobile app (React Native and Expo, NativeWind v4) renders a live whiteboard on which the bot draws via structured tool calls, with full pause-and-resume across sessions. The bot's LLMContext snapshots persist per turn, allowing seamless rehydration on resume with prior board state.
I designed a chapter-scoped lesson lifecycle and a 2-stage post-session analyzer that runs Gemini structured-output passes to (1) audit each session and (2) maintain rolling per-chapter mastery state used to personalize the next session. I also designed the entire UX—an Apple-Fitness-inspired system spanning Summary, Learn, Practice, and Notes tabs, with bilingual rules (Bangla content, English chrome) baked into a locked design token palette.
Mirars - an AI Agent that Runs the Whole Study
CodeFiz - Real-time Collaborative Coding Platform
Understudy – Any Web App, Demoed with AI
Datacube - Excel for Billions of Rows
I owned the TypeScript facade bridging React and the C++ engine, covering pivoting, filtering, SQL, data sources, themes, column statistics, and S3 browsing through the Emscripten API. On top of it, I built a drag-and-drop pivot builder with three cross-linked, sortable drop zones, per-column aggregation, and datetime granularity that compiles to a single `pivot()` engine call, as well as an AI assistant that generates schema-aware prompts from the engine, calls GPT-4o-mini in JSON mode, and applies the generated SQL to the grid in one click.
Fuvii - Social, for Food Videos
Video uploads go directly to S3 through 60-second v4-presigned PUT URLs, keeping uploads off the application server and feeding downstream processing. I added cross-entity search across restaurants, dishes, and videos (PostgreSQL full-text relevance with a case-insensitive fallback), shipped a parallel MongoDB/Mongoose backend alongside the Prisma and PostgreSQL one, and built the front ends: a Next.js consumer application, an admin application, B2B portal features, and a React Native mobile application.
Ostad AI - a Bengali Tutor Bot on WhatsAPP and Telegram
Everything is grounded in a knowledge base I built myself: image-based NCTB/HSC Bengali-medium textbooks processed through Gemini Vision OCR, block-aware chunking, and embeddings stored in Supabase pgvector, which both channels query by RPC. The knowledge base went through three generations: an OCR spike, a first end-to-end ICT pipeline with dual-embedding retrieval, and a PRD-driven production rewrite with full ingestion provenance and HNSW indexing.
Bengali TTS - Trained AI Model for Natural Voice
The core engineering win was diagnosing why SGLang-Omni, which defaults to an H200 (141 GB), OOMs the vocoder on a 24 GB card, then patching three values in `stages.py` (mem_fraction_static` from 0.85 to 0.55, `chunked_prefill_size` from 8192 to 2048, and `max_running_requests` from 64 to 4) to achieve a stable around 16 GB footprint. I also wrote a dependency-free Bun client with a tiered Bengali text-normalization front end featuring a full 0–99 number-word table with lakh and crore logic, an English-to-Bengali phonetic dictionary, abbreviation and dari handling, sentence chunking, and hand-rolled RIFF/WAV concatenation.
Weekend Trendz - eCommerce Storefront with Support Bot
The part I'm proudest of is the support bot behind it. Instead of using a hosted NLP service, I hand-built the entire intent-classification model in PyTorch: a three-layer feed-forward network defined from scratch in `nn.Module`, fed by my own NLTK tokenization, Porter stemming, and bag-of-words pipeline, trained with a custom Adam and `CrossEntropyLoss` loop, then serialized with its vocabulary and served for real-time inference through Flask and gunicorn on Heroku. I designed and labeled my own intent dataset and gated inference based on confidence, so the bot declined rather than guessing on out-of-scope queries. The browser-side Web Speech voice and chat layer was a small, optional add-on that called the same endpoint.
Automated Dashboard Watcher & Data Extraction Agent
Skills
Libraries/APIs
React, daisyUI, React Query, Zod, Stripe API, WebRTC, Node.js, Socket.IO, REST APIs, Stripe, React Testing Library, API Development, GraphQL API, OpenAPI, React Flow, Playwright, Google Maps API, OpenAI API, Claude API, Shopify API, D3.js, Highcharts, Stripe Connect, Gocardless API, Google Maps SDK, Twilio API, Pydantic, Python Asyncio, FFmpeg, KaTeX
Tools
React Apollo, Prisma, ChatGPT, Claude, GitHub, Git, Firebase Authentication, Firebase Cloud Messaging (FCM), Claude Code, Agora, Figma, Sentry, Zapier, n8n, Vitest, RabbitMQ, Emscripten, Canvas, Whisper, Webpack, Codex, Chrome Developer Tools
Languages
GraphQL, TypeScript, HTML5, JavaScript, CSS, HTML, Python, SQL, PHP, Python 3
Frameworks
Tailwind CSS, tRPC, React Native, NestJS, Tauri, Next.js, Express.js, Redux, Jest, Cypress, JSON Web Tokens (JWT), Swagger, Agentic Frameworks, LangGraph, GrammY, Django
Paradigms
Real-time Systems, Code Refactoring, Back-end Architecture, Database Design, Role-based Access Control (RBAC), Event-driven Architecture, UX Design, Model Context Protocol (MCP), App Development, ACID, Automated Testing, Microservices, Microservices Architecture, DevOps
Platforms
Firebase, Shopify, LiveKit, Vertex AI, Android, iOS, Amazon Web Services (AWS), AWS Lambda, Google Cloud Platform (GCP), Vercel, OpenTok, Apache Kafka, CrewAI, AWS IoT, Azure, Docker, Blockchain
Storage
PostgreSQL, MySQL, Redis, Database Architecture, JSON, NoSQL, Databases, Database Structure, MariaDB, Amazon S3 (AWS S3), MongoDB, Google Cloud, Cloud Deployment, SQLite
Other
Data Visualization, WebSockets, Gemini API, LLM Integration, Supabase, AI Voice Agents, Full-stack, Full-stack Development, Webhooks, Performance Optimization, SaaS, Real-time Data, Speech-to-Text (STT), Text-to-Speech (TTS), Large Language Models (LLMs), Artificial Intelligence (AI), AI Tools, API Integration, Agentic AI, Integration, API Design, APIs, Architecture, Back-end, Command-line Interface (CLI), Analytics, Software Architecture, System Architecture, Authorization, Authentication, Startups, App Design, Gemini, OpenAI, Geolocation, Back-end Development, Fintech, Payment Processing, SaaS Architecture, Application State Management, Communication, Tailwind UI, AI-assisted Development, Minimum Viable Product (MVP), Code Review, Code Auditing, Debugging, POS, Multi-tenant Architecture, API Documentation, System Integration, Data Structures, eCommerce, Solution Architecture, Dashboards, Front-end, Charts, RESTFul APIs, Deployment, OAuth, Firebase Cloud Functions, Firebase Hosting, Generative Artificial Intelligence (GenAI), Website Performance, Data Modeling, Front-end Development, User Interface (UI), RESTful Web Services, Admin Panels, Dashboard Development, Scalable Architecture, Agentic Coding, User Experience (UX), Large Language Model Operations (LLMOps), Multi-agent Orchestration, Workflow Automation, AI Agents, LangChain, Optical Character Recognition (OCR), Expense Management, FastAPI, Cursor AI, ElevenLabs Solutions, Exa.ai, Pgvector, Agent Skills, Video Processing, Project Leadership, Technical Leadership, Low-latency Software, Prompt Engineering, AI Integration, CI/CD Pipelines, Web Crawlers, Maps, Scraping, AWS Cloud Architecture, Financials, Security, AI Pipeline, Distributed Systems, Scalability, Retrieval-augmented Generation (RAG), Cloud Infrastructure, Recommendation Systems, AI Agent Orchestration, AI Architecture, CRM, CTO, Fractional CTO, Zoho, Data Privacy, Event-driven Systems, Infrastructure, Know Your Customer (KYC), Ledgers, Money Transfers, Payment APIs, Payments, QR Codes, Transactions, Marketplaces, Cloud, Computer Science, Videos, Large-scale Web Crawlers, Web Scraping, Financial Data, Open Banking APIs, Swan.io, Yapily API, Browserbase, Stagehand, BullMQ, Resend, Domain Migration, WebAssembly (Wasm), Silero, Machine Learning, Chrome DevTools, Website Data Scraping
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