---
title: Rymthos Dev — Premium Web & Mobile Development
description: Custom websites, mobile apps, e-commerce, and AI integrations. Built by Md. Billal Hossain. Secure, fast, and engineered to convert.
image: https://i.postimg.cc/7LmBHj90/Man-wearing-structured-coat-2K-202608122133-1.jpg
url: https://rymthos.dev/
---

# Rymthos Dev — We Build Software That Delivers

Rymthos Dev is an international digital production studio founded by **Md. Billal Hossain**. We build bespoke websites, full-stack backends, and mobile apps in Flutter, React Native, and Android Kotlin — engineered from scratch to convert.

We reject bloated templates, unneeded libraries, and generic AI-generated code. Every client system is handcrafted, security-hardened, and optimized for sub-second performance.

---

## Key Highlights & Performance Benchmarks

- **Sub-Second First Contentful Paint**: Real-world load times under 1.2 seconds with 95+ Google PageSpeed scores.
- **Strict Row-Level Security (RLS)**: PostgreSQL databases isolated at the engine level with zero public data exposure.
- **Offline-First Mobile Architecture**: 60fps applications with SQLite caching that open instantly without network lag.
- **Global & Local Checkout Rails**: Support for Stripe, PayPal, Apple Pay, Google Pay, plus Bangladeshi local payment rails (bKash, Nagad, Rocket) with zero third-party platform cuts.
- **100% Intellectual Property Ownership**: Full source code, deployment scripts, and database migrations transferred to the client upon completion.

---

## Core Services

### 1. Custom Web Applications & Brand Hubs

- **Starting Price**: $179 USD / ৳19,990 BDT
- **Timeline**: 7–14 days
- **Technology Stack**: React 19, Next.js, TypeScript, Tailwind CSS, Vite
- **Deliverables**: Sub-second page loads, responsive mobile-first UI, semantic SEO structure, and clean Git repository.

### 2. Headless E-Commerce & Storefronts

- **Starting Price**: $449 USD / ৳49,990 BDT
- **Timeline**: 10–14 days
- **Technology Stack**: Next.js, PostgreSQL, Stripe, Redis, Tailwind CSS
- **Deliverables**: Tokenized sub-second checkout, merchant sales dashboard, automated PDF invoicing, and real-time inventory synchronization.

### 3. Cloud Restaurant & Retail POS + Auto-Token Kit

- **Starting Price**: $499 USD / ৳54,990 BDT
- **Timeline**: 7–12 days
- **Technology Stack**: Next.js / PWA, WebSockets, Supabase Realtime, ESC/POS, WebBluetooth
- **Deliverables**: Mobile waiter web app, cashier counter POS, plug-and-play thermal printer bridge, and 5-minute self-setup guide.

### 4. Cross-Platform & Native Mobile Apps

- **Starting Price**: $349 USD / ৳39,990 BDT
- **Timeline**: 7–21 days
- **Technology Stack**: Flutter, React Native, Native Android Kotlin, Firebase, SQLite
- **Deliverables**: Production iOS & Android builds, offline-first local database caching, push notifications, and App Store / Google Play publishing assistance.

### 5. Autonomous AI Voice Agents & Phone Receptionists

- **Starting Price**: $599 USD / ৳69,990 BDT
- **Timeline**: 7–12 days
- **Technology Stack**: Twilio, Vapi, ElevenLabs, Node.js, FastAPI
- **Deliverables**: Low-latency phone answering (<600ms), verified pricing knowledge base, automated Google Calendar booking, and zero carrier markup.

### 6. Private Enterprise AI Knowledge Hub & Secure RAG

- **Starting Price**: $899 USD / ৳99,990 BDT
- **Timeline**: 10–14 days
- **Technology Stack**: Supabase pgvector, Next.js, Claude 3.5 Sonnet, LangChain, TypeScript
- **Deliverables**: Isolated vector search engine, streaming UI, exact PDF page citations, and strict Row-Level Security permissions.

### 7. Intelligent Document Processing (IDP) & OCR Pipelines

- **Starting Price**: $699 USD / ৳79,990 BDT
- **Timeline**: 7–12 days
- **Technology Stack**: Claude 3.5 Vision, Gemini 2.0 Flash, Python / Node.js, PostgreSQL, Docker
- **Deliverables**: Multi-page PDF/receipt extraction into validated JSON, admin verification review queue, and ERP/accounting sync.

### 8. Autonomous Agentic Workflows & CRM Orchestration

- **Starting Price**: $549 USD / ৳59,990 BDT
- **Timeline**: 7–10 days
- **Technology Stack**: n8n (Docker), Python, LangGraph, Telegram Bot API, PostgreSQL
- **Deliverables**: Self-hosted unmetered workflow automation, prospect domain enrichment, and interactive Telegram command dashboards.

### 9. Full-Stack SaaS & Scalable Backend Architectures

- **Starting Price**: $799 USD / ৳89,990 BDT
- **Timeline**: 10–18 days
- **Technology Stack**: Node.js, Express, PostgreSQL, Supabase, Redis, Docker
- **Deliverables**: Normalized relational database schema, Zod-validated APIs, PgBouncer connection pooling, and Docker deployment recipes.

### 10. Enterprise Security Hardening & Zero-Downtime Migration

- **Starting Price**: $399 USD / ৳44,990 BDT
- **Timeline**: 4–10 days
- **Technology Stack**: Next.js, PostgreSQL, Docker, Cloudflare WAF, Strix CLI
- **Deliverables**: Comprehensive penetration audit report, remediation of P0/P1 security flaws, zero-downtime database migration from legacy WordPress/PHP, and 100% SEO redirect preservation.

---

## Live System Diagnostics & Web Audit Engine

Rymthos Dev features a proprietary real-time website diagnostics terminal. It inspects any business website in real-time, uncovering:

- Core Web Vitals and load latency
- Mobile responsiveness and viewport clipping
- E-commerce checkout friction and broken carts
- SSL, security headers, and SSRF vulnerabilities
- Estimated monthly revenue lost due to conversion friction

---

## Transparent Flat-Rate Pricing Tiers

1. **Starter**: $179 USD / ৳19,990 BDT
   - High-trust personal brand site or landing page
   - Up to 5 custom pages, mobile-first design, contact form, SEO structure
   - Timeline: 7–10 days
2. **Business**: $449 USD / ৳49,990 BDT
   - Multi-page corporate site with lead generation engine
   - Content management, automated email/Telegram alerts, advanced SEO
   - Timeline: 14–18 days
3. **Scale / Full-Stack**: $999 USD / ৳109,990 BDT
   - Bespoke web application, SaaS platform, or mobile app
   - Relational database, role-based auth, payments, API integrations
   - Timeline: 21–30 days
4. **E-Commerce Engine**: $749 USD / ৳79,990 BDT
   - Full-featured storefront with automated courier dispatch and admin panel
   - Timeline: 14–21 days

---

## Selected Projects

- **100ToolCrate** (`https://100toolcrate.com`): A suite of 100+ client-side utility tools for developers and creators. Built for extreme privacy with zero tracking scripts and instant execution.
- **Salah Companion** (`https://github.com/enoch77-max/Salah_Companion`): Open-source mobile application built with Flutter. Provides offline prayer times, Qibla compass, and zero analytics tracking.
- **Commerce Engine**: High-velocity headless e-commerce storefront with sub-second tokenized checkout, real-time inventory locking, and multi-currency billing.
- **Pulse Analytics**: Enterprise real-time business intelligence dashboard with role-based access control, live telemetry, and sub-5ms caching.

---

## Founder & Contact Channels

- **Founder**: Md. Billal Hossain
- **Email**: `rymthos.dev@gmail.com`
- **Primary WhatsApp (Bangladesh)**: `+880 1400 788 738`
- **Direct Phone / WhatsApp (Saudi Arabia)**: `+966 57 187 6846`
- **Website**: `https://rymthos.dev`
- **Hours**: 24/7 International Client Support

```json
{
  "@context": "https://schema.org",
  "@type": "ProfessionalService",
  "name": "Rymthos Dev",
  "url": "https://rymthos.dev",
  "founder": {
    "@type": "Person",
    "name": "Md. Billal Hossain"
  },
  "description": "Custom websites, mobile apps, e-commerce and AI integrations — secure, fast, and built to convert.",
  "email": "rymthos.dev@gmail.com",
  "telephone": "+966571876846",
  "areaServed": "Worldwide",
  "knowsAbout": [
    "Full-Stack Web Development",
    "Backend & Database Architecture",
    "Mobile Apps (Flutter, React Native, Kotlin)",
    "E-Commerce Systems",
    "API Security & Hardening",
    "UI/UX Design",
    "Autonomous AI Agents"
  ],
  "priceRange": "$179 - $2500"
}
```