You will get API & Microservices Design Package
Top Rated
Top Rated
Project details
● Enterprise-grade API & Microservices Architecture Design
● Clean, scalable RESTful API structure with clear service boundaries
● Domain-driven Microservices strategy (modular & maintainable)
● High-performance architecture for SaaS & high-traffic systems
● Secure API design (authentication, authorization, best practices)
● API Gateway & service communication planning
● Database strategy per service (SQL / NoSQL / hybrid models)
● Cloud-ready design (AWS / Azure / GCP compatible)
● Fault tolerance, scalability & resilience strategy
● Clear architecture documentation for development teams
I design APIs and microservices that are structured, secure, and built for long-term scalability.
If your current system is tightly coupled, hard to scale, or unclear — I will transform it into a clean, production-ready architecture blueprint your team can confidently build on.
● Clean, scalable RESTful API structure with clear service boundaries
● Domain-driven Microservices strategy (modular & maintainable)
● High-performance architecture for SaaS & high-traffic systems
● Secure API design (authentication, authorization, best practices)
● API Gateway & service communication planning
● Database strategy per service (SQL / NoSQL / hybrid models)
● Cloud-ready design (AWS / Azure / GCP compatible)
● Fault tolerance, scalability & resilience strategy
● Clear architecture documentation for development teams
I design APIs and microservices that are structured, secure, and built for long-term scalability.
If your current system is tightly coupled, hard to scale, or unclear — I will transform it into a clean, production-ready architecture blueprint your team can confidently build on.
Programming Languages
JavaScript, ASP.NET, C#Coding Expertise
Performance Optimization, Security, DesignWhat's included
| Service Tiers |
Starter
$350
|
Standard
$750
|
Advanced
$1,500
|
|---|---|---|---|
| Delivery Time | 5 days | 7 days | 10 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 7 | 15 | 25 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
Optional add-ons
You can add these on the next page.
Additional Revision
+$100
API Security Review
+$250
Performance Optimization Plan
+$300
Cloud Deployment Strategy
+$300
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AB
Arif B.
Feb 14, 2026
React.js + Next.js Developer Needed for Project Enhancements
Exceptional React.js, Next.js, and API developer. We brought him in at a critical moment when the project was facing serious issues, and he resolved everything within just 2 days. That was truly impressive.
He quickly understood our architecture, identified the root problems, and delivered clean, scalable solutions. His technical depth, speed, and logical approach really stood out.
Reliable, highly skilled, and calm under pressure. We would absolutely hire him again without hesitation.
He quickly understood our architecture, identified the root problems, and delivered clean, scalable solutions. His technical depth, speed, and logical approach really stood out.
Reliable, highly skilled, and calm under pressure. We would absolutely hire him again without hesitation.
AB
Arif B.
Jun 17, 2021
Develop a ASP.NET MVC 5 Web API
Another awesome work by Rayhan. He makes my business profitable more than my expectations.
NG
Naeem G.
Jan 28, 2020
Opencart Theme and SSL issue
Good understanding and job completed within time
AB
Arif B.
Sep 23, 2019
Develop a Web based Authentication module using WebAPI and angular
Rayhan did the work successfully . He is simply amazing !!!
RE
Riec E.
Aug 30, 2018
ASP.net C# Project
Excellent !!, Will hire again.
About Md Rayhan
Full Stack .NET & React/Next.js Developer | AI, LLM and SaaS Architect
100%
Job Success
Dhaka, Bangladesh - 11:46 am local time
✅ Top Rated
✅ 100% Job Success
✅ 15+ Years Experience
✅ 1700+ Hours Delivered
✅ 40+ Global Clients
If you need a scalable, secure, and production-ready system — not just feature-based development — you're in the right place.
I design, architect, and build high-performance systems using .NET, React/Next.js, AI/LLM APIs, Microservices, and Azure Cloud. Currently working on enterprise-level AI healthcare systems alongside select freelance projects — building real-world AI systems, not just demo prototypes.
With 15+ years of experience across healthcare, travel tech, education ERP, and enterprise SaaS, I specialize in delivering software that is:
◆ Scalable under real-world traffic
◆ Secure and enterprise-ready (CEH v12 Certified)
◆ Cleanly architected and maintainable
◆ Built for long-term product growth
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🎯 What I Deliver
✔ SaaS Platforms (multi-tenant, scalable architecture)
✔ AI-Powered Applications — Voice AI, Chatbots, AI Therapy Agents, Automation
✔ LLM Integration (OpenAI GPT-4, Azure OpenAI, Gemini, Grok, DeepSeek)
✔ Azure Speech STT/TTS — Real-time voice AI systems
✔ Enterprise Web Applications & ERP Systems
✔ API-First & Microservices Architecture
✔ System Refactoring & Architecture Redesign
✔ Cloud-Ready Azure Deployments & DevOps
✔ Security-First Development (file validation, auth, HIPAA-aware design)
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📊 Proven Results (Not Just Claims)
→ Reduced system downtime by ~60% through architecture redesign and cloud optimization
→ Improved database query performance by ~40% via advanced SQL Server tuning
→ Cut defect rates by ~35% by introducing structured QA and clean architecture practices
→ Reduced manual effort by ~50% through intelligent automation and workflow design
→ Led 8-person engineering teams delivering systems for 15,000+ active users
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🧠 What Sets Me Apart
I don't just develop features. I:
👉 Design complete system architecture from day one
👉 Lead technical direction and hands-on implementation
👉 Ensure performance, security & scalability at every layer
👉 Reduce long-term technical debt with clean, maintainable code
👉 Deliver end-to-end ownership — from architecture to production
You get architect-level thinking combined with senior full stack execution.
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🛠 Technical Stack
🔹 Backend & Architecture
.NET 8 / ASP.NET Core, REST APIs, Microservices, Clean Architecture, Entity Framework Core
🔹 Frontend
React, Next.js, TypeScript, Modern UI Architecture
🔹 AI & Intelligent Systems
OpenAI GPT-4, Azure OpenAI, Azure Speech STT/TTS, Gemini, Grok, DeepSeek, AI Agents, Prompt Engineering, LLM Integration with Existing Systems, Voice AI, Mental Health AI, Conversational AI
🔹 Databases
SQL Server (advanced tuning & optimization), MySQL, PostgreSQL
🔹 Cloud & DevOps
Microsoft Azure, CI/CD Pipelines, Git, Docker, Production Optimization
🔹 Security
CEH v12 Certified, Secure API Design, Auth/Refresh Token Systems, HIPAA-Aware Architecture, File Upload Security, Penetration Testing Awareness
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🏥 Domain Experience
◆ Healthcare & Mental Health AI Systems (US-based)
◆ Travel Technology & OTA Platforms (B2C, B2B, White-label)
◆ University ERP & Student Information Systems (15,000+ users)
◆ Enterprise SaaS & Multi-tenant Systems
◆ eCommerce & POS Systems
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🤝 Who I Work Best With
I partner with businesses that want:
◆ Long-term technical stability, not quick hacks
◆ Strong engineering standards and security-first design
◆ Scalable SaaS foundations built to grow
◆ Reliable technical leadership they can trust
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📩 Let's Talk
If you're building something serious — an AI platform, SaaS product, enterprise system, or need architecture leadership — let's connect. I'm selective about projects I take on, which is why my clients get focused, high-quality work every time.
Send me a message and let's discuss how I can help you build it right.
Steps for completing your project
After purchasing the project, send requirements so Md Rayhan can start the project.
Delivery time starts when Md Rayhan receives requirements from you.
Md Rayhan works on your project following the steps below.
Revisions may occur after the delivery date.
Discovery & Technical Assessment
I review your current system, business goals, traffic expectations, and technical constraints. This ensures architecture decisions align with scalability, cost, and long-term growth.
Architecture Strategy & Design
I design a clean, scalable API & microservices architecture including service boundaries, database strategy, communication patterns (REST, messaging), and cloud infrastructure planning.