👋 Hey, I'm Sayed Risat — a Full Stack Developer & Digital Strategist from Chattogram, Bangladesh 🇧🇩
I build full-stack products, automation tools, and SaaS apps — mostly for my own ventures and clients at Lit Fusion. I started out running Meta Ads and building marketing funnels, then realized the best tools didn't exist yet. So I started building them myself.
🏢 Ventures → Lit Fusion (Agency) · AUREM (Clothing) · Skivia (Creative Studio)
🧰 Core Stack → Next.js · TypeScript · Node.js · Python · MongoDB · Redis · Docker
📖 Learning → ML Pipelines · System Design · AWS · LangChain · Microservices
⚡ Fun Fact → Started as a marketer. Realized the best tools don't exist. Started building them.
| 🔨 Working On | Full-stack web apps & automation tools powering Lit Fusion's workflows — dashboards, scrapers, Chrome extensions |
| 🤝 Collaborate | Next.js / React SaaS tools, dev tools for marketers, browser extensions, open-source projects |
| 🆘 Help Wanted | Advanced TypeScript patterns, ML pipeline scaling, production system design |
| 📚 Learning | Next.js · TypeScript · Redux · Python ML · CI/CD · Docker · AWS · LangChain · DSA |
| 💬 Ask Me About | Full-stack dev, Chrome extensions, Meta Ads funnels, or shipping solo as a builder |
| ⚡ Fun Fact | I ran Meta Ads campaigns that generated thousands in leads — now I build the tools that make it faster |
🌐 Episode 1 — Web Fundamentals & JavaScript
- How the Internet works: DNS, HTTP/HTTPS, TCP/UDP, SSL/TLS, Proxies, VPNs
- Semantic HTML, Browser Rendering (Reflow/Repaint), Accessibility & ARIA
- CSS Architecture — Box Model, Flexbox, Grid, BEM, Container Queries
- SASS — Variables, Mixins, Nesting, Functions, Control Directives
- TailwindCSS & Bootstrap — utility-first vs component-based approach
- JavaScript — DOM, Events, Async/Await, Promises, Web APIs, LocalStorage
- TypeScript — Types, Interfaces, Generics, Union/Intersection, tsconfig
⚛️ Episode 2 — React, Frontend Architecture & Next.js
- React fundamentals — Virtual DOM, JSX, Hooks, Lifecycle, Custom Hooks
- State Management — Redux Toolkit, Context API, Zustand
- React Router, React Query (TanStack), React Hook Form + Zod
- Performance — React.memo, useMemo, useCallback, Code Splitting
- Next.js — File-based Routing, Layouts, SSR, SSG, ISR, Server Actions
- Building REST APIs within Next.js App Router
🔧 Episode 3 — Node.js, MongoDB & Backend Architecture
- Node.js server, NPM, Express.js, EJS templating
- MVC Architecture, REST API design, Versioning
- Middleware — built-in, third-party, error-handling, Helmet, CORS
- File uploads with Multer + Cloudinary
- MongoDB with Mongoose — Aggregation Pipeline, Indexing, Operators
- Authentication — JWT, bcrypt, Passport.js, OAuth, RBAC
- WebSockets + Socket.io for real-time apps
- Redis Caching — TTL, Pub/Sub, Complex Data Structures
- Testing — Jest, Unit Testing
- Logging — Winston, Pino, Morgan
- Production setup — PM2, ESLint, Prettier, async-handler, CORS config
🤖 Episode 4 — Generative AI Engineering
- LLM internals — Tokens, Context Window, Temperature, Hallucination
- Prompt Engineering — Few-shot, Chain-of-Thought, Output Formatting
- Structured Outputs — JSON mode, Schema-based prompting, Zod validation
- Tool/Function Calling — deterministic AI actions
- Streaming Responses — progressive rendering for better UX
- Embeddings, Vector Databases, Document Chunking
- RAG Pipeline — Retrieve → Inject → Structured Answer
- LangChain — Chains, Agents, Memory, Tools, LCEL
- Multi-Agent Systems — Planner/Executor, Researcher/Writer patterns
🚢 Episode 5 — Production, Infrastructure & Deployment
- DevOps fundamentals — CI/CD, IaC, Linux basics, SSH
- Docker — Dockerfiles, Compose, multi-stage builds
- AWS — EC2, Security Groups, ALB, CloudFront, CDN
- GitHub Actions — automated test, build, and deploy pipelines
- Scalability — Vertical vs Horizontal, Load Balancing, Stateless design
🏗️ Episode 6 — Microservices, Scaling & Web3
- Monolith vs Microservices — service boundaries, DB-per-service
- API Gateway pattern — routing, auth centralization
- Event-driven architecture — RabbitMQ, Pub/Sub, idempotency
- AWS Cloud-Native — ECR, ECS, Fargate, VPC, IAM
- Production hardening — Rate Limiting, DDoS, secure headers
- Redis caching at scale, CloudWatch observability
- Web3 Basics — Blockchain, DApps, Smart Contracts
💡 Episode 7 — DSA with JavaScript
- Arrays, Strings, Objects — Two Pointer, Prefix Sum, Kadane's Algorithm
- OOP in JavaScript — Classes, Constructors,
this, Prototype - Sorting — Selection, Insertion, Merge, Quick, Cyclic Sort
- Binary Search — standard, rotated arrays, 2D matrix
- Linked Lists (Singly, Doubly, Circular), Stacks, Queues
- Hashing — Set, Map, frequency problems
- Trees — Binary Tree, BST, Traversals, LCA
- Recursion & Backtracking — N-Queens, Sudoku, Subset Sum
- Time & Space Complexity — Big-O analysis
🏛️ Episode 9 — System Design (LLD + HLD)
- SOLID Principles, DRY, Design Patterns (Creational, Structural, Behavioral)
- Machine Coding — Parking Lot, Vending Machine, BookMyShow, Uber/Ola
- HLD — Capacity Estimation, SQL vs NoSQL, API Design, Sharding
- Core Infrastructure — Caching, CDN, Load Balancing, Message Queues
- Distributed Systems — Fault Tolerance, Observability, Rate Limiting, Search Systems
- 12 real-world system design problems
Built with intent. Shipped with purpose.
Chattogram, Bangladesh 🇧🇩