● AI AGENT ENGINEER · FULL-STACK DEPTH

I build AI agents
that do real work.

Voice tutors, banking automations, research crews — shipped and measured. I build the agent loop and the whole production system under it.

See the agents →Get in touch
01 / Agents

AI agents & voice

Voice tutors, research crews, and browser agents that actually ship — agent loops, MCP tools, and sub-second voice pipelines.

6 agent systems shipped in 2026

02 / 0→1

Founding-engineer depth

I take products from nothing to launched. As Dynt's founding engineer I wrote ~82% of the codebase — open banking to card issuing.

~82% of a fintech, solo

03 / Systems

Real-time & data UIs

DAG workflow viz, a C++/WASM data grid, offline-first POS, WebRTC voice — the hard frontend, not CRUD.

React 19 · WASM · WebRTC

About

I build AI agents that do real work, not demos that fall over when you click twice. The proof is the boring stuff underneath: at the fintech Dynt I wrote about 82% of the commits, including a webhook queue that stops banks from breaking each other when events arrive out of order.

The fun stuff sits on top. No off-the-shelf model speaks colloquial Bangla, so I trained one from a single YouTube video on a rented RTX 3090. My tutor's voice stalled because Bangla sentences end in a danda, not a period, so I taught the tokenizer the difference and got seconds back. I work from the model loop down to the Postgres view. I'm in Dhaka, and I want to teach Bangladeshi students with this.

01 — Selected Work

Agents first. Foundations underneath.

Thirteen projects across agents, fintech, real-time systems, and data. Confidential work is shown as a case study — what I built and the impact, without proprietary code.

$ demo-agent capture --url acme.app
▸ crawling 40 screens… done (9m41s)
▸ composing narrated walkthrough…
▸ rendering demo.mp4 + sandbox ✓
▸this site's demo — generated by the agent itself

demo-agent

FLAGSHIP

— any web app, demoed automatically

Point an agent at any live web app; get a narrated video, a guided tour, or an offline clickable sandbox.

3 output modes~10 min to ~40 screens$0.05–0.15 per deep sandbox37+20 safety rules
Read the case study →

Dynt

CASE STUDY

— a fintech, built by one engineer

Founding engineer who wrote ~82% of a fintech unifying 30+ EU banks, card issuing, and AI bookkeeping.

~82% of the codebase30+ EU banks−85% invoice processing time
Jun 2023 – Apr 2024 (full-time), then ongoingRead case study →

Mirars

VOICE AI

— an agent that runs the whole study

An AI agent that sources candidates, runs voice interviews, and writes the study report from one chat.

18 tools, 2 transports165/165 server tests34/37 commits, sole author
Apr–May 2026View project →

Datatailr

CASE STUDY

— the console for a data platform

I owned the web console for a container job-orchestration platform: 412 of 543 frontend commits.

76% of the frontend (412/543)90% test coverageN+1→1 query fan-out cut
2024 – 2026Read case study →

dt.cube

CASE STUDY

— Excel for billions of rows

I built the analyst-facing UI for a WASM grid that renders datasets too big for Excel.

527 commits, #2 of ~88,239 lines of C++ core8 feature panels
2024 – 2025Read case study →

Mr. Topper

VOICE AI

— a real-time Bangla voice tutor

A real-time Bangla voice tutor for HSC students — Pipecat voice, live whiteboard, ~32 BDT a lesson.

~32 BDT per 30-min lesson8 whiteboard tools~1–3s faster first audio
2026View project →

TutorBot BD

MESSAGING

— a tutor that lives on WhatsApp

A production WhatsApp tutor answering text, photo, and voice questions — a full messaging-bot stack on its own.

8 LangGraph nodes441 MB / 13 PDFs3 provider failover
2026View project →

Bengali TTS

ML / TRAINING

— a custom voice model from one video

I trained a custom Bengali speech model from a single YouTube video, end to end.

187 clips / 17.6 min1 YouTube video~16 GB of 24 GB VRAM
2026View project →

Possier

CASE STUDY

— a multi-tenant, offline-first POS

Architected a restaurant POS as a multi-tenant, offline-first system with sync baked into the schema.

200+ restaurant clients26 tables / 6 domains4,336 line ERP controller
2022 – 2023Read case study →

Fuvii

CASE STUDY

— social, for food video

A TikTok-style social platform for food videos — feeds, follows, and direct-to-S3 uploads — built solo at Possier.

18 / 28 models / endpoints4 apps shipped2 parallel backends
2022Read case study →

Neoke

CASE STUDY

— passport to verified, in one flow

Built the web flow that captures a passport and selfie, then checks the traveler against IATA travel rules.

35 commits / 14 days7 routes / 8 pages2 verification APIs
Feb – Mar 2025Read case study →

CodeFiz

EARLY · 2022

— four real-time tools, one room

Four collaboration tools in one browser room: live editor, whiteboard, doc, and video, synced over Socket.IO.

57 commits, sole author16 real-time channels3 code runtimes
2022View project →

Weekend Trendz

EARLY · 2021

— voice-first shopping, in 2021

A fashion e-commerce store with a voice-controlled support chatbot, on a Python backend I wrote — in 2021.

65 commits, solo2021 voice chatbotPython self-hosted NLP
2021 – 2022View project →
✦Wrote ~82% of a fintech's backend — 2,913 of 3,559 commits — as founding engineer.✦Trained a Bengali TTS model from one YouTube video, served on a $1/day RTX 3090.✦Invented a Bangla sentence tokenizer that splits on the danda (।) to cut voice-agent latency.✦Shipped a voice-controlled shopping chatbot with a hand-written PyTorch/Flask backend in 2021.✦Ran CrewAI multi-agent pipelines in production in May 2024.✦Built an agent that builds tools for agents: demo-agent installs as a Claude Code skill.✦Shipped code from thermal receipt printers to EU open-banking rails to a C++/WASM data grid.✦Wrote ~82% of a fintech's backend — 2,913 of 3,559 commits — as founding engineer.✦Trained a Bengali TTS model from one YouTube video, served on a $1/day RTX 3090.✦Invented a Bangla sentence tokenizer that splits on the danda (।) to cut voice-agent latency.✦Shipped a voice-controlled shopping chatbot with a hand-written PyTorch/Flask backend in 2021.✦Ran CrewAI multi-agent pipelines in production in May 2024.✦Built an agent that builds tools for agents: demo-agent installs as a Claude Code skill.✦Shipped code from thermal receipt printers to EU open-banking rails to a C++/WASM data grid.

02 — Experience

Five years, four startups, zero handoffs.

  1. AI Agent Systems · Independent

    2026 — present
    • Built demo-agent and Mirars end to end, and architected Mr. Topper — a real-time Bangla voice tutor — on a Pipecat voice pipeline with a NestJS backend.
    • Trained a Bengali text-to-speech model from scratch — YouTube scrape, Demucs isolation, Whisper labeling, XTTS-v2 fine-tune — and served it on a $0.22/hr RTX 3090.
    • Shipped agents on two transports from one tool registry (chat + MCP), so the same agent installs into Claude Code or Cursor with zero client config.

  2. Lead Frontend Engineer · Datatailr

    2024 — 2026
    • Owned the platform console end to end: 412 of 543 frontend commits (76%), ~37,650 lines of TypeScript across 14 routed pages.
    • Cut a fleet-scale dashboard's GraphQL N+1 fan-out to one indexed read by writing 442 lines of Postgres analytics views exposed through pg_graphql (issue #1297).
    • Built the DAG workflow viewer on xyflow + dagre with viewport-culled rendering, and wired a dual codegen pipeline (GraphQL Codegen + orval) into the build.

  3. Founding Software Engineer · Dynt

    Jun 2023 — Apr 2024 (full-time), then ongoing
    • Wrote ~82% of commits across three repos as founding engineer: 2,913 of 3,559, and roughly 61,000 lines of TypeScript.
    • Built the open-banking sync layer (Swan, Yapily, GoCardless, CSV → one model) and solved out-of-order Swan webhooks with a typed, dependency-ordered EventQueue.
    • Shipped Stripe card issuing with Zod-validated KYC, a json-rules-engine automation system with a full audit trail, and a CrewAI bookkeeping crew (May 2024).

  4. Full-Stack Engineer · Neoke

    2024 — 2025
    • Built Neoke's traveler ID-verification web flow: webcam document and selfie capture, OCR/MRZ result display, and a face-match confidence dial.
    • Integrated IATA Timatic's travel-requirements API (OAuth2 client-credentials) behind an Express/Bun proxy with Zod-validated schemas.
    • Built the marketing site's blog and FAQ on a Strapi CMS backend with a React front end.

  5. Sole Engineer · Possier

    2022 — 2023
    • Sole engineer on a restaurant-POS vendor's products serving 200+ clients across a consumer social platform, the legacy ERP, and a ground-up POS rebuild.
    • Built Fuvii, a social food-video platform (Express + TS + Prisma, 18 models, 28 endpoints) with an engagement-ranked feed and direct-to-S3 presigned uploads.
    • Architected the ground-up multi-tenant POS rebuild (Turborepo + NestJS + Drizzle, 26 tables, offline-first sync, atomic multi-tender checkout).
5+
years shipping
~82%
of a fintech's code
200+
POS clients served

03 — Stack

Tools I bet products on.

AI / Agents ✦
  • LangGraph
  • LangChain
  • CrewAI
  • Model Context Protocol (MCP)
  • LiveKit Agents
  • Pipecat
  • Gemini
  • OpenAI
  • Groq
  • Deepgram STT
  • Cartesia / ElevenLabs TTS
  • pgvector
  • PyTorch
  • XTTS-v2 / Fish Speech
  • Stagehand
  • Playwright
Backend
  • TypeScript
  • Python
  • NestJS
  • Hono
  • Fastify
  • Express
  • tRPC
  • Prisma
  • Drizzle
  • PostgreSQL
  • Supabase
  • Redis / BullMQ
  • GraphQL / pg_graphql
  • Zod / Pydantic
Frontend
  • React 18 / 19
  • Next.js
  • Vite
  • TanStack Query
  • Apollo Client
  • Tailwind
  • xyflow + dagre
  • Monaco
  • React Native
  • Tauri
  • Canvas / WASM bridges
Infra / Tooling
  • Browserbase
  • ffmpeg
  • Docker
  • Fly.io
  • Vercel
  • AWS S3
  • Turborepo / pnpm
  • GraphQL Codegen + orval
  • WebRTC / Socket.IO
  • RTX 3090 model serving

// from thermal receipt printers to voice agents — the stack just keeps getting weirder

04 — Signal

What people say.

● quotes incoming
“
A quote on founding-engineer ownership and trust.
— Founder / CEO, Dynt
“
A quote on lead-frontend ownership and the fleet-scale perf fix.
— Engineering lead, Datatailr
“
A quote on social proof on the merged PR.
— LangChain.js maintainer
“
A quote on the independent 2026 work shipping and working.
— Voice-AI peer or early user

05 — Contact

Let's build an agent
that ships.

Open to AI agent engineering work — contract or full-time. The hard problems are the fun ones.

hmshuvo314@gmail.comLinkedInRésumé ↓
↗ Merged into langchain-ai/langchainjs#6889

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