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$ whoami

I'm a Senior Software Engineer and the Founder of Vertoone — a software product studio engineering high-performance digital systems, AI-powered automation, and cloud-native SaaS products. With 4+ years of production battle-testing, I design architectures that aren't just functional — they're durable. I've shipped distributed microservices, real-time event pipelines, latency-sensitive APIs, multi-tenant SaaS platforms, and AI automation tools from concept through production. My philosophy: own the system end-to-end. From data model to deployment pipeline, monitoring dashboards to post-incident reviews — I treat every layer as mine to care for. At Vertoone we're actively building 6 products spanning billiard & snooker management, AI chatbots, marketing automation, ISP portals, home management, and custom software development — serving clients worldwide. "Complexity is the enemy. Build simple systems that scale gracefully."

const tamkin: Engineer = { role: "Senior Software Engineer", company: "Founder @ Vertoone", location: "Bangladesh 🌏 · Remote-First", contact: { work: "admin@vertoone.com", personal: "tamkin22rahman@gmail.com", whatsapp: "+880 1894-700564", web: "vertoone.com", }, building: [ "Billiard & Snooker Manager", "AI Chatbot Platform", "AI Marketing Automation", "ISP Portal", "Happy Home", "Custom Software Dev", ], strengths: [ "System Design & DDD", "AI / LLM Integration", "Workflow & Marketing Automation", "Third-Party API Orchestration", "Real-Time & Event Systems", "Cloud Infrastructure", ], };

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🏢 Vertoone — Products & Services

Crafting scalable digital products at vertoone.com

🎱 Billiard & Snooker Manager Enterprise-grade multi-tenant SaaS for billiard and snooker clubs. Per-minute session billing (zero rounding), tournament formats (8-ball, 9-ball, 10-ball, snooker), game-accurate scoring UIs with correct rack layouts, Stripe subscriptions, and role-based staff access. NestJS PostgreSQL Stripe Docker React	🤖 AI Chatbot Platform Intelligent, trainable chatbot platform for businesses. Multi-channel deployment across web, WhatsApp, and Messenger — with AI-powered ticket routing, custom knowledge base, conversation analytics, and seamless live agent handoff. OpenAI Node.js MongoDB Socket.io React	⚡ AI Marketing Automation End-to-end marketing automation powered by AI. Campaign orchestration across Meta, Google, Instagram, and email — AI-generated copy, audience segmentation, conversion tracking, A/B testing, and intelligent drip automation workflows. n8n Meta API Google Ads API OpenAI BullMQ
🌐 ISP Portal Full-featured management portal for Internet Service Providers. Customer onboarding, package billing, bandwidth monitoring, helpdesk ticketing, network status dashboards, and reseller management. Multi-tenant, white-label ready. Node.js MongoDB React Redis WebSockets	🏠 Happy Home Smart home management platform for residential complexes and property managers. Maintenance requests, visitor logs, utility billing, community announcements, and resident communication — all unified in a single platform. React Native Node.js MongoDB Firebase Stripe	🛠️ Custom Software Development Vertoone takes on bespoke software projects worldwide — MVPs to enterprise platforms. Full-stack web, mobile apps, AI integrations, third-party API orchestration, and cloud infrastructure. End-to-end from spec to production deploy. MERN NestJS React Native GCP AWS

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📊 Skills & Focus at a Glance

◈ Expertise Depth

  Backend Development    ████████████████████  98%  ██ Node.js · NestJS · Express
  System Architecture    ███████████████████░  94%  ██ DDD · Microservices · CQRS
  API Design & Integr.   ███████████████████░  93%  ██ REST · GraphQL · 40+ APIs
  AI / LLM Integration   ██████████████████░░  90%  ██ OpenAI · Claude · RAG
  Cloud & DevOps         █████████████████░░░  86%  ██ GCP · AWS · K8s · Docker
  Workflow Automation    █████████████████░░░  85%  ██ n8n · Zapier · BullMQ
  Frontend (React)       ████████████████░░░░  80%  ██ React · Next.js · Redux
  Mobile Dev             ████████████░░░░░░░░  62%  ██ React Native · Expo

◈ Stack Time Distribution

  Node.js / NestJS   ██████████████████████████████████░░░░░░  36%
  React / Next.js    ███████████████████████░░░░░░░░░░░░░░░░░  22%
  MongoDB            █████████████████░░░░░░░░░░░░░░░░░░░░░░░  16%
  DevOps / Cloud     ██████████░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░  10%
  AI & Automation    ████████░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░   8%
  PostgreSQL / SQL   █████░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░   5%
  Other / Scripts    ███░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░   3%

◈ Integration Coverage

  Social & Messaging APIs    ██████████████████████  Meta · Instagram · WhatsApp · Messenger
  Ads & Analytics            ████████████████████░░  Google Ads · Meta Ads · GA4 · GTM
  Payments & Billing         ███████████████████░░░  Stripe · PayPal · Paddle · Shopify
  Email & Communication      █████████████████░░░░░  SendGrid · Mailchimp · Twilio · SMTP
  Auth & Identity            ████████████████░░░░░░  OAuth2 · Firebase · JWT · CASL · RBAC
  CRM & Productivity         ██████████████░░░░░░░░  HubSpot · Intercom · Slack · Notion
  AI & Automation APIs       ████████████░░░░░░░░░░  OpenAI · Claude · ElevenLabs · n8n

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⚙️ Engineering Expertise

🏗️ System Architecture Microservices with domain boundaries & DDD Event-driven systems with Kafka & RabbitMQ CQRS, Saga pattern, and Outbox pattern API Gateway, BFF, and service mesh patterns Modular monolith → microservice migration paths 🛡️ Reliability & Security JWT / OAuth2 / RBAC / API key auth CASL-based attribute-level permission systems Rate limiting, throttling & circuit breakers Graceful degradation & fault isolation Dependency auditing & SAST pipelines 💬 Real-Time & Event Systems WebSocket architecture with Socket.io at scale WebRTC signaling & peer-to-peer streaming Event sourcing and message queue design Pub/Sub with Redis for lightweight eventing 📈 Performance Engineering Sub-50ms API response optimization MongoDB aggregation pipeline tuning & indexing Multi-layer caching (Redis + CDN + in-memory) Database read replicas & query planning insertMany batching & parallel async patterns Profiling with APM tools and flame graphs

☁️ Cloud & DevOps Docker + Kubernetes + Helm chart deployments GitOps with GitHub Actions / GitLab CI Blue-green & canary release strategies Observability: Prometheus, Grafana, ELK Stack GCP: Cloud Storage, Cloud Run, Compute, GCS 🤖 AI & LLM Integration Prompt engineering: Claude Opus, GPT-4, Gemini Local LLM inference: LM Studio + Ollama RAG pipelines with Pinecone / pgvector ElevenLabs TTS + Whisper STT in production OpenAI / Anthropic SDK in Node.js backends Chatbot training, knowledge base, agent flows ⚡ Workflow & Marketing Automation n8n & Zapier multi-step automation design Webhook-driven event orchestration & retry BullMQ / Agenda.js scheduled job pipelines Email drip, nurture & re-engagement sequences AI-triggered actions from behavioral events Multi-channel campaign orchestration (Meta + Google) 🔌 Third-Party API Orchestration OAuth 2.0 flows across 15+ platforms Webhook ingestion, verification & idempotency Rate-limit-aware clients with exponential backoff Multi-platform data sync & conflict resolution

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🧰 Technical Arsenal

◈ Core Backend

◈ Data & Messaging

◈ AI, LLMs & Automation

◈ Social, Ads & Marketing Platforms

◈ Payments, Auth & Communication

◈ Cloud & Infrastructure

◈ Frontend & Mobile

◈ Observability & CI/CD

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🔌 Third-Party Integration Map

Production-grade integrations across 40+ platforms — OAuth 2.0 flows, webhook ingestion, rate-limit-aware clients, multi-platform data sync, and idempotent event handling at scale.

📱 Social & Messaging Meta Graph API — Pages, Posts, Leads, Comments, Insights Instagram Graph API — Media, DMs, Stories, Reels Insights WhatsApp Business API — Template messages, chatbot flows, broadcasts Facebook Login — OAuth, App review, Dev Mode handling Messenger Platform — Webhooks, Send API, Handover Protocol YouTube Data API — Video management, channel analytics TikTok API — Content publishing, analytics

📣 Ads & Analytics Google Ads API — Campaign management, bidding, reporting Meta Ads API — Ad sets, creatives, A/B tests, conversion events Google Analytics 4 — Event tracking, funnel & cohort analysis Google Tag Manager — Tag injection, custom triggers Facebook Pixel — Conversion events, custom audiences, retargeting Google Search Console — Indexing, query performance LinkedIn Ads API — B2B campaign management & tracking

💳 Payments & Commerce Stripe — Subscriptions, Connect, webhooks, invoicing, refunds PayPal REST API — One-time & recurring payments Shopify API — Products, orders, inventory sync Paddle — SaaS billing & international tax automation 📧 Email & Communication SendGrid — Transactional email, dynamic templates Mailchimp — Lists, campaigns, drip automation Twilio — SMS, Voice, Verify OTP, WhatsApp Business Nodemailer — SMTP relay & custom mail pipelines

🔧 Productivity & CRM Google OAuth 2.0 — Workspace SSO & scoped API access Gmail API — Read/send on behalf of users Google Calendar — Event CRUD, availability sync Google Drive — File management & sharing Slack API — Bots, Webhooks, Block Kit, modals HubSpot — Contacts, deals, workflow triggers Intercom — In-app messaging, user segmentation Firebase — Auth, Realtime DB, FCM push notifications Notion API — Database sync, page management

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📈 GitHub Metrics

  

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🏆 GitHub Achievements

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🐍 Contribution Trail

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🧠 Engineering Principles

🎯 Full Ownership I trace bugs from frontend to DB layer, own the deploy, and write the runbook. No handoffs, no excuses.	⚡ Simplicity First Every abstraction must earn its place. I optimize for the engineer reading this code at 2am during an incident.	📐 Design Before Code ADRs, ERDs, and sequence diagrams before the first function. Slow down to speed up.	🔁 Ship → Measure → Improve Deploy early, instrument everything, iterate fast. Perfect is the enemy of deployed.
🤖 AI-Augmented Velocity I leverage LLMs, local models, and automation to multiply engineering throughput without sacrificing quality.	🔌 Integration Fluency Treat every third-party API as a dependency to be respected — versioned, rate-limited, idempotent, and monitored.	🏗️ Build for Evolution Systems must outlive the team that built them. I document intent, not just implementation.	🌍 Product Thinking I write code but think in user outcomes. Features exist to solve real problems — not satisfy technical curiosity.

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📬 Connect & Collaborate

Open to senior engineering roles, technical advisory, architecture consulting, and custom development through Vertoone.

If you're building something that needs to scale — let's make it happen.