njbSaab njbSaab

Hi, I'm Najib Saab 👋

👨‍💻 About Me

I'm Najib Saab — Senior Full-Stack Engineer from Kyiv with 5+ years of commercial experience. I own products end-to-end: architecture, backend APIs, databases, infrastructure, CI/CD, monitoring and the UI. Over the last 3 years I've been building high-volume B2C platforms (iGaming / affiliate, sports data, subscription SaaS, lead-gen funnels) as the sole full-stack and DevOps owner.

🏗️ Creator of njX UI — lightweight CSS component library, 25+ components, 9 themes, ~40KB, zero dependencies
⚙️ Backend: NestJS (Clean Architecture · CQRS · DDD) · Go (net/http, chi, pgx — high-concurrency services) · Hono Workers · Python (FastAPI, Django)
🖥️ Frontend: React 19 · Angular 15–20 (OOP + FSD, SSR) · Svelte 5 · Astro (SSR / SSG) · PWA
🗄️ Data: PostgreSQL (pgvector, jsonb, advisory locks) · MySQL / MariaDB · Redis · MongoDB · Cloudflare D1 · Prisma · TypeORM · Drizzle · pgx
🔁 Queues & caching: BullMQ · Cloudflare Queues · PostgreSQL job queues (SKIP LOCKED) · Celery · two-tier caches · singleflight
🚀 DevOps: up to 5 production VDS from scratch — Linux hardening, Nginx / Caddy, TLS, Docker, PM2, CI/CD, zero-downtime deploys · AWS (EC2, S3, Lambda) · Cloudflare end-to-end (DNS, proxy, email, Workers, D1, R2, Queues, Pages)
📈 Observability: Sentry · Grafana · Prometheus · Uptime Kuma · structured logging · Telegram ops alerts
🤖 AI: LLM pipelines via OpenRouter / Groq / Claude / Gemini · embeddings + pgvector · FastAPI AI microservices · agent automation
🛍️ Building a portfolio of Shopify apps on Cloudflare Workers (webhooks → queues → consumers, 600+ tests)
📍 Kyiv · Remote OK · 50+ projects · Full development cycle
📫 hi@njxui.dev

🎨 njX UI — My Open Source Project

njX UI is a lightweight CSS component library — 25+ components, 9 color themes, zero JavaScript dependencies, ~40KB minified. Drop one <link> tag and go.

<!-- Latest version -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/njx-ui/css/style.min.css">
<script src="https://cdn.jsdelivr.net/npm/njx-ui/js/njx.js"></script>

<!-- Pinned version (recommended for production) -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/njx-ui@1.0.4/css/style.min.css">
<script src="https://cdn.jsdelivr.net/npm/njx-ui@1.0.4/js/njx.js"></script>

🧩 What I've Built Recently

Project	What it is	Stack
Sports / Esports Events Hub	Go microservice aggregating events & results from a data provider and serving partner feeds with grant-based access, two-tier cache, singleflight, advisory-locked jobs	Go 1.26 · chi · pgx · PostgreSQL 16 · Docker
Seamless Registration Platform	Single backend for 40+ landing pages: one-step partner registration, anti-fraud, multi-tenant mail service (OTP, 100k campaigns, drip chains) on PostgreSQL queues, Prometheus metrics	Go · Fastify · PostgreSQL · Drizzle · Angular 20 · Vue 3
Sports Predictions + AI Content Agent	Real-time prediction platform (WebSocket, BullMQ) and an autonomous news agent with a 10-stage LLM quality funnel and pgvector dedup	NestJS 11 · Go · Python / FastAPI · pgvector · React 19 · Expo
FreeSlot — Slots Catalog	Self-populating catalog with AI recommendations and 5 languages; 2,800+ req/s, p95 ≈ 20–40 ms	NestJS · Django · PostgreSQL + pgvector · Redis · React 19 · Vue 3
Quiz-Funnel Platform	Multi-brand lead-gen funnels: server-authoritative scoring, multi-tenant email chains, 38 KB gzip Svelte PWA, live DB migrations	NestJS 11 · Prisma · MySQL · BullMQ · Svelte 5 · Angular 18
Telegram SMM Platform	6 independent services (~19k LOC): bot, GraphQL API, admin, email microservice, landing generator, edge predictions API	NestJS · GraphQL · Angular · Astro / Vue · Bun · Cloudflare Workers + D1
Shopify Apps on Cloudflare	5 apps on one engine: HMAC webhooks → Queues → consumers, Bulk Operations sync, batched alerts, App Pricing billing	TypeScript · Hono · Workers · D1 · Queues · R2 · Vitest

🛠️ Tech Stack

📊 GitHub Stats

🤝 Connect with Me

🔧 Who I am in code

const najib = {
  name:       "Najib Saab",
  alias:      "nj / @Nj_Saab",
  location:   "Kyiv",
  remote:     true,
  role:       "Senior Full-Stack Engineer",
  experience: "5+ years commercial · 3 years owning systems end-to-end",
  projects:   "50+",

  openSource: {
    name:    "njX UI",
    type:    "CSS component library",
    stack:   ["Pure CSS", "CSS Variables", "9 themes", "~40KB"],
    url:     "https://njxui.dev",
  },

  backend: {
    primary: ["NestJS", "Clean Architecture", "CQRS", "DDD", "TypeScript"],
    go:      ["net/http", "chi", "pgx", "singleflight", "high-concurrency services"],
    also:    ["Fastify", "Hono", "Bun", "Python", "FastAPI", "Django"],
    api:     ["REST", "GraphQL", "WebSocket", "OpenAPI", "Microservices"],
    auth:    ["JWT", "OTP / passwordless", "OAuth2", "RBAC", "HMAC webhooks"],
  },

  frontend: {
    primary: ["React 19", "Next.js", "Angular", "OOP + FSD", "SSR"],
    also:    ["Vue 3", "Svelte 5", "Astro", "Expo / React Native"],
    state:   ["TanStack Query", "Zustand", "Redux", "NgRx", "RxJS", "Pinia"],
    css:     ["SCSS", "Tailwind", "njX UI"],
    targets: ["SPA", "PWA", "SSG landings", "Telegram Mini Apps"],
  },

  data: {
    relational: ["PostgreSQL", "pgvector", "MySQL / MariaDB"],
    nosql:      ["Redis", "MongoDB"],
    edge:       ["Cloudflare D1", "R2"],
    orm:        ["Prisma", "TypeORM", "Drizzle", "pgx"],
    queues:     ["BullMQ", "Cloudflare Queues", "PostgreSQL SKIP LOCKED", "Celery"],
  },

  devops: {
    servers:    ["up to 5 VDS from scratch", "Linux hardening", "Nginx / Caddy", "TLS"],
    containers: ["Docker", "Docker Compose", "PM2"],
    cloud:      ["Cloudflare Workers / D1 / R2 / Queues", "AWS EC2 / S3 / Lambda"],
    delivery:   ["GitHub Actions", "CI/CD", "zero-downtime deploys"],
    observe:    ["Sentry", "Grafana", "Prometheus", "Uptime Kuma"],
  },

  ai:        ["OpenRouter", "Groq", "Claude", "Gemini", "embeddings + pgvector", "LLM pipelines"],
  contact:   "sdr.expert@gmail.com",
};

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