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Shahin
@shahriar_shahin
Full Stack Developer Flutter React NodeJS Expert
Bangladesh
Hindi, Bengali
About me
Hi! I'm Shahriar Shahin
, a Full-Stack Software Developer specializing in Flutter, React, Next.js, Node.js, Java, and Python. I build high-performance mobile apps, web applications, AI-powered SaaS platforms, ERP/CRM systems, and e-commerce solutions. My expertise includes Flutter, REST APIs, Firebase, SQL/NoSQL databases, AI integration, and payment gateways. I deliver clean, scalable, and reliable software with clear communication and a focus on quality. Let's build your next project!
Skills
Shahin
Offline •
Average response time: 1 hour
See my services
Cross-Platform Development
I will configure and deploy your fluxstore flutter app
Mobile App Customization
I will build mobile app for your shopify store
Portfolio
Work experience
Founder & Full-Stack Software Develope
ChatGPT • Self-employed
Nov 2025 - Present • 9 mos
Founder & Full-Stack Software Developer – ReplyNext AI Designed and developed ReplyNext AI, a multi-tenant AI-powered SaaS platform that helps businesses automate customer communication across multiple channels. Responsible for the complete software development lifecycle, including architecture, frontend, backend, API integrations, AI features, deployment, and ongoing maintenance. Key Responsibilities & Achievements Designed and developed a scalable multi-tenant SaaS platform. Built responsive web and mobile applications using modern technologies. Developed secure REST APIs with Node.js and Express.js. Integrated OpenAI and Google Gemini AI for intelligent customer interactions. Implemented WhatsApp Cloud API, Facebook Messenger, Instagram Messaging, and website live chat integrations. Built CRM, customer management, and AI automation features. Integrated payment gateways and subscription management. Designed secure authentication, user roles, and permissions. Optimized application performance, security, and scalability. Managed deployment, maintenance, and continuous feature development. Technologies Flutter • React • Next.js • Node.js • Express.js • JavaScript • TypeScript • PostgreSQL • MongoDB • Firebase • REST APIs • OpenAI API • Google Gemini • Git • Docker • AWS
24 Reviews
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Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
1-5 out of 24 Reviews
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ziaurrehman
Pakistan
It was great experience with him. He was more cooperative and experienced skilled. we recommend him for our upcoming project also other can work with him with confidence.
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mdrezaulkari590
Bangladesh
I was incredibly impressed with his ability to handle complex projects. He was cooperative, patient, and always willing to go the extra mile. The final delivery was exactly what I was looking for, and I approved it with a smile. Highly recommend!
Seller's Response
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rolando19878
Bolivia
Helpful?
kgolanem
South Africa
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jouymj
Spain
Ongoing collaboration
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