Woztell
Software Engineer
- Handle their backend services
- Implement Voice Calling Extentension
Node.js
Express.js
GraphQL
AWS
Docker
Serverless
React
Oct, 2024 - Present
Spain & Bangladesh (Remote)
Rayhan Kobir 👋
Software Engineer 🧑💻
A passionate Software Engineer and freelancer, dedicated to building innovative
& high-quality software products and web applications, back-end focused solutions.
Skills
JavaScript
TypeScript
Go
Node.js
Next Js
Nest Js
React
PostgreSQL
MongoDB
Redis
WebRTC
WebSocket
GraphQL
Microservices
Docker
AWS
Serverless
CI/CD
Git
RPC
tRPC
Let's connect
My Experiences
Where I’ve Been Employed
Velar
Junior Software Engineer
Next.js
Node.js
Nest.js
Typescript
Docker
AWS
CI/CD
Kubernetes
MongoDB
PostgreSQL
Prisma
tRPC
Feb, 2024 - Oct, 2024
Montreal, Canada (Remote)
Jan, 2023 - Sep, 2023
Chittagong, Bangladesh (Hybrid)
Jan, 2022 - Dec, 2022
Chittagong, Bangladesh (Hybrid)
My Latest Works
Featured Projects And Works
Compilation of case studies that evoke my sense of pride
Silent Eye (Admin)
SilentEye is an advanced mobile device monitoring and control platform designed to give users comprehensive remote access and management capabilities using only a phone number—no physical access or app installation required.
Next.jsTailwind CSSTypeScriptReact
🔐 Confidential
Silent Eye (Core)
SilentEye is an advanced mobile device monitoring and control platform designed to give users comprehensive remote access and management capabilities using only a phone number—no physical access or app installation required.
Next.jsTailwind CSSTypeScriptReact
🔐 Confidential
Trion - Chatbot Platform
Trion is a chatbot platform that allows users to create flows and send messages to social media platforms or other media.
Nest.jsNext.jsPostgreSQLRedisWebSocketGraphQL
🔐 Confidential
Educational Background
Where I’ve Been Studied
Green University of Bangladesh
Bachelor of Science in Computer Science and Engineering
Nov 2024 - Dec 2024
Dhaka, Bangladesh
Naogaon Polytechnic Institute
Diploma in Computer Science and Engineering
Nov 2024 - Dec 2024
Naogaon, Rajshahi
Al Helal Islami Accademy
Seconday School Certificate
Nov 2024 - Dec 2024
Sapahar, Naogaon
Testimonials
What People Say About Me
Here are some testimonials from my clients and colleagues.
Perfect communication, did everything i asked for and explained the code to me as well. Can only recommend him! Quick and fast, helped with site for my business
★★★★★
Zennit Music
Music Company
He was willing to go up and beyond the requested requirements to get the job done. I appreciate this seller's willing to work with what I requested him to complete.
★★★★★
Carlly B
Business Owner
Good job i have to say, comunication as wanted, reacted to revisions and all that in a professional matter.
★★★★★
George
Business Consultant
Perfect!! And very fast in delivering the project, when I had problem in running the project he knew where was the problem and showed me exactly how to run it.
★★★★★
Toom Hary
Business Consultant
He does exceptional quality work, he was very patient with my requirements and offered to make all the modifications and revisions needed. I definitely would recommend.
★★★★★
Jooseph
Product Manager
Resilient and kept on trying different solutions until problem resolved. thank you.
★★★★★
Alterson
Software Engineer
Rayhan Kobir was great to work with. The website looks exactly like the wire-frames supplied. Rayhan kobir was very responsive and delivered the product in a timely manner.
★★★★★
Revolution
Business Owner
It was great working with Raju Rayhan and will consider him for future products.
★★★★★
Dr Pradeep
Doctor
Perfect communication, did everything i asked for and explained the code to me as well. Can only recommend him! Quick and fast, helped with site for my business
★★★★★
Zennit Music
Music Company
He was willing to go up and beyond the requested requirements to get the job done. I appreciate this seller's willing to work with what I requested him to complete.
★★★★★
Carlly B
Business Owner
Good job i have to say, comunication as wanted, reacted to revisions and all that in a professional matter.
★★★★★
George
Business Consultant
Perfect!! And very fast in delivering the project, when I had problem in running the project he knew where was the problem and showed me exactly how to run it.
★★★★★
Toom Hary
Business Consultant
He does exceptional quality work, he was very patient with my requirements and offered to make all the modifications and revisions needed. I definitely would recommend.
★★★★★
Jooseph
Product Manager
Resilient and kept on trying different solutions until problem resolved. thank you.
★★★★★
Alterson
Software Engineer
Rayhan Kobir was great to work with. The website looks exactly like the wire-frames supplied. Rayhan kobir was very responsive and delivered the product in a timely manner.
★★★★★
Revolution
Business Owner
It was great working with Raju Rayhan and will consider him for future products.
★★★★★
Dr Pradeep
Doctor
Let's Connect and Create Something Amazing!
Ready to bring your next project to life? Let's connect and discuss how I can help you achieve your goals.
Thoughts and Blogs
Read My Narrative
Look into my thoughts and my latest blogs.
ওয়েব অ্যাপ্লিকেশনের গতি ও কার্যকারিতা বাড়াতে HTTP ETag ব্যবহারের সুবিধা
ETag (Entity Tag) হলো একটি HTTP হেডার, যা ওয়েব রিসোর্সের নির্দিষ্ট ভার্সনকে ইউনিকভাবে চিহ্নিত করে। এটি মূলত ক্যাশিং এবং কনকারেন্সি কন্ট্রোলের জন্য ব্যবহৃত হয়। যখন কোনো রিসোর্স সার্ভার থেকে ক্লায়েন্টে পাঠানো হয়, তখন সেই রিসোর্সের জন্য একটি ETag জেনারেট করা হয় এবং HTTP রেসপন্সের ETag হেডারে সেট করা হয়।
Understanding Caching Strategies in Next.js
Caching is a vital performance optimization technique that stores copies of files or data in a temporary storage location (the cache) for quick access. Implementing an effective caching strategy can significantly improve application speed, reduce load on servers, and provide a better user experience.
Node.js-এ WebRTC সেটআপ
WebRTC হলো একটি ওপেন সোর্স টেকনোলজি, যা ব্রাউজার ও মোবাইল অ্যাপে রিয়েল-টাইম অডিও, ভিডিও এবং ডেটা ট্রান্সফার সহজ করে। Node.js-এ WebRTC ইন্টিগ্রেশন করলে আপনি স্কেলেবল ও পারফরম্যান্ট রিয়েল-টাইম অ্যাপ্লিকেশন তৈরি করতে পারবেন।
Node.js-এ Webhook ইমপ্লিমেন্টেশন: PostgreSQL ও Redis সহ
Node.js-এ Webhook ইমপ্লিমেন্টেশন, PostgreSQL ও Redis ইন্টিগ্রেশন, এবং ইভেন্ট-ড্রিভেন আর্কিটেকচারের মাধ্যমে কিভাবে রিয়েল-টাইম ও স্কেলেবল সিস্টেম তৈরি করা যায়, তার বিস্তারিত আলোচনা।
WhatsApp Voice Calling Integration with WebRTC and Node.js and React
WhatsApp’s Business API now supports calling, opening up new possibilities for integrating real-time voice communication directly into web applications. Imagine receiving a WhatsApp call not on your phone, but right in your browser. That’s what I set out to achieve and this article walks you through exactly how I did it, step-by-step.
Hackathons
I like Building Things
During my time in university, I attended 5+ hackathons. People from around the country would come together and build incredible things in 2-3 days. It was eye-opening to see the endless possibilities brought to life by a group of motivated and passionate individuals.
StepSync
Chrome Extension
Developing a chrome extension that will allow users to sop as like scribed capture their steps and export as pdf.