Rashidul I.

I specialize in AI-powered application development and integrations TypeScript, React, Next.js, Node.js, Angular, AWS, MongoDB, PostgreSQL, and SQL Server, with extensive experience working on both modern SaaS platforms and large/legacy applications. I've been working with Upwork clients since 2010, completing long-term software development engagements across SaaS, enterprise applications, data platforms, GIS, integrations, and cloud systems. After taking time away from Upwork to complete my MSc in Computer Science at Dalhousie University and work in senior software engineering roles in Canada, I'm now selectively accepting 20–25 hours/week of long-term part-time work. ### What I do best 🔹 Existing Application & SaaS Development Take over existing applications, understand unfamiliar codebases quickly, fix issues, implement new features, improve architecture, and continue development without unnecessarily disrupting working systems. 🔹 React / Next.js / Node.js Production-grade applications using TypeScript, React, Next.js, Node.js, NestJS, Express, REST APIs, GraphQL, Redux, WebSockets, and modern frontend architectures. 🔹 Legacy Application Modernization Modernize AngularJS, jQuery, PHP, .NET and other legacy systems into maintainable modern architectures while minimizing disruption to existing users and business operations. 🔹 Debugging & Performance Optimization Investigate difficult application issues, slow APIs, database bottlenecks, frontend performance problems, integration failures, production bugs, and technical debt. 🔹 AWS & Cloud Development Build and improve production cloud applications using AWS, Docker, CI/CD, Terraform, serverless technologies, databases, monitoring, and scalable deployment architectures. 🔹 API & Third-Party Integrations Design and implement reliable integrations with external APIs, authentication systems, payment platforms, webhooks, SaaS services, and real-time systems. 🔹 AI & API Integrations Integrate AI capabilities into existing applications, including LLM APIs, intelligent workflows, automation, AI-powered features, and third-party AI services. 🔹 GIS & Location-Based Applications Build mapping, tracking, geofencing, routing, real-time location, and geospatial applications using Mapbox, Google Maps, ArcGIS, OpenLayers, and OpenStreetMap. ### Core Technology Frontend: React, Next.js, Angular, TypeScript, JavaScript, Redux, Vue, Tailwind, Material UI, Vite Backend: Node.js, NestJS, Express, Python, FastAPI, Django, Go, PHP, .NET Core AI: AI Integration, Generative AI, OpenAI / ChatGPT, Claude Databases: PostgreSQL, MongoDB, MySQL, SQL Server, Oracle, DynamoDB, Redis Cloud & DevOps: AWS, Docker, Terraform, CI/CD, Jenkins, Nginx, Vercel, AWS Amplify Other: REST APIs, GraphQL, WebSockets, Stripe, authentication/authorization, microservices, GIS, geofencing, real-time systems ### Why clients hire me • 20+ years of software engineering experience • 19K+ hours of Upwork experience • 100% Job Success Score • 5.0/5 client rating • Proven experience with long-term engagements • Strong ability to take over existing applications • Production-focused engineering and problem solving • Clean, maintainable and scalable architecture • Strong attention to security and performance • Clear communication and documentation • Comfortable working independently with minimal supervision • Experienced with modern AI-assisted development workflows ### Availability I'm available for long-term part-time engagements, typically 20–25 hours/week, with flexibility based on project needs. If you need a senior developer to take over an existing application, solve difficult technical problems, modernize a legacy system, build new SaaS functionality, or provide ongoing development and maintenance, I'd be happy to discuss your project. I prefer building long-term client relationships where I can become a reliable technical partner rather than simply completing one-off tasks.