Web and Mobile App Development

We thoroughly reviewed your project requirements and understand exactly what you need built. Our team regularly works with this exact tech stack across full-stack web, Android, and iOS development, having delivered similar scalable, high-performance solutions before. From responsive frontends and clean mobile architecture to secure backend APIs, we have the hands-on expertise to execute this flawlessly and deliver a production-ready product on time.

Hello, I'm a full-stack Python developer with 5+ years of professional experience building and deploying production-level platforms, including B2B SaaS, e-commerce, real-time booking systems, AI integrations, and high-volume automation. I've worked extensively with scalable backend architectures, payment gateways, cloud deployment, and fully documented API ecosystems. MY RELEVANT PROJECTS 1. Nomadly — B2B eSIM Platform & B2C Marketplace Website: https://nomadly.cloud/ Marketplace: https://marketplace.nomadly.cloud/ API Documentation: https://nomadly.cloud/api/docs/ Developed a comprehensive B2B eSIM distribution platform with a B2C marketplace currently under development. Integrated Airalo and eSIM Access APIs, an AI-powered assistant for eSIM installation and troubleshooting, and payment gateways including Cryptomus, PayPal, and PayPalych. Implemented Celery, Redis, background task queues, idempotency, automated provisioning, transaction recovery, and fully documented partner REST APIs using Swagger/OpenAPI. 2. MK Shipping — Real-Time Ticket Booking Platform Website: https://mkshippinglines.com/ Built a complete online ship ticketing system featuring dynamic vessel layouts, real-time seat availability, Redis-based seat locking, WebSockets, multi-stop pricing, and automated ticket generation. Integrated SSLCommerz and bKash payment systems. 3. Razer Bot — High-Volume Purchase Automation Website: https://rzrautobot.com/ Developed an automated purchasing platform processing thousands of orders daily using Python, Playwright, Celery, RabbitMQ, and Redis. Implemented concurrent order processing, automated purchases, retry mechanisms, transaction reconciliation, and error recovery. 4. Attendance & Payroll Management — B2B SaaS Built a multi-tenant HR management platform with biometric attendance device integration, automated attendance calculations, payroll management, employee management, role-based permissions, reporting, and comprehensive REST APIs. 5. Felna Tech — Backend Development Website: https://felnatech.com/ Contributed to backend development, server-side functionality, and application business logic. 6. Shopify Fashion E-Commerce Store Demo: https://development-store-vkltwpxg.myshopify.com/ Password: 1 Developed a responsive fashion e-commerce storefront featuring modern UI/UX, product collections, variants, and intuitive navigation. TECHNICAL EXPERTISE & DEVELOPMENT APPROACH My primary technologies include Python, Django, Django REST Framework, PostgreSQL, MySQL, Celery, Redis, RabbitMQ, WebSockets, Docker, and REST APIs. I have deployed and maintained multiple production applications on cloud servers using Linux, Nginx, Gunicorn, Uvicorn, Celery workers, Redis, PostgreSQL, and SSL configurations. For your platform, I recommend a modular, API-driven architecture supporting web, Android, and iOS applications. I prioritize responsive UI/UX, secure authentication, scalable database design, reliable integrations, automated testing, API validation, performance optimization, and thorough quality assurance. TEAM STRUCTURE, AVAILABILITY & TIMELINE I can lead the technical architecture, backend development, API integrations, and cloud deployment while coordinating frontend, mobile, UI/UX, and QA workstreams based on project requirements. Team allocation and availability can be finalized after reviewing the technical specifications. I understand your total budget of $50,000 and propose following your two-phase development structure. Phase 1: $12,000 — 30 days Prototype development, core architecture, UI/UX design, database structure, API foundations, and modules M1–M3. Phase 2: $38,000 — 60 days Development of modules M4–M11, web and mobile integrations, testing, performance optimization, quality assurance, and production deployment. Total Project Cost: $50,000 Total Proposed Timeline: 90 days The timeline is subject to final technical requirements, team capacity, and scope confirmation. Module M12 can be estimated separately once its requirements are finalized. I'm also interested in establishing a long-term partnership for future development, maintenance, and ongoing improvements. I'd be happy to discuss your project requirements and development strategy in more detail. Best regards, Ajay Ghosh Full-Stack Python Developer

Hello, I’m an experienced Full-Stack Developer with nearly 8 years of experience designing, developing, and deploying scalable web applications, mobile solutions, APIs, and database-driven platforms. I’m interested in partnering with you to build your platform from the initial prototype through full production deployment and ongoing improvements. My approach focuses on building a solid technical foundation, delivering modules incrementally, and ensuring the application is secure, maintainable, scalable, and ready for future expansion. **My proposed technical approach:** - **Frontend:** Next.js, React.js, and React Native for web and cross-platform mobile development. - **Backend:** NestJS/Node.js with well-structured, scalable REST APIs. - **Database:** PostgreSQL or MongoDB, selected according to the application's data model and business requirements. - **Authentication & Security:** Secure authentication, role-based access control, input validation, and appropriate data protection. - **Infrastructure:** Cloud deployment, CI/CD, monitoring, performance optimization, and production-ready environments. - **Quality Assurance:** Structured testing, API validation, bug fixing, and technical documentation. **Development approach** I propose starting with Phase 1, covering the prototype, UI/UX implementation, core architecture, and modules M1–M3. This will establish the product's technical foundation and validate key user workflows before proceeding to modules M4–M11. Module M12 can be scoped and estimated separately once its requirements are finalized. I will prioritize clean architecture, reusable components, clear API contracts, regular progress updates, and milestone-based delivery. I also understand the importance of coordinating web and mobile development to maintain a consistent user experience across all platforms. **Proposed budget: USD 48,000** My bid covers the planned development scope across both phases, subject to reviewing the detailed requirements and agreeing on the final deliverables and acceptance criteria. The budget represents a competitive offer for the planned 5,000-hour scope, with the final schedule and resource allocation to be confirmed during project planning. I’m also interested in building a long-term working relationship to support future modules, integrations, maintenance, and new feature development. I would welcome the opportunity to review your detailed technical requirements, discuss your priorities, and propose a practical delivery roadmap. Best regards, Sabbir Ahmed Shawon Full-Stack Developer