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I help startups and companies build production-ready MVPs and scalable web applications using .NET and Angular. I’m a Senior Software Engineer with 18+ years of experience, currently working with US and Australian clients to deliver stable, maintainable, real-world systems. My focus is on clean architecture, pragmatic decisions, and long-term maintainability. C# ASP.NET Web API .NET 6 / 7 / 8 Angular TypeScript SQL Server Azure REST API Entity Framework Core MVP Development

I am Microsoft Certified Professional Developer(MCPD). 13+ years of work experience in Web and Desktop Development, Consulting, Analytics, Planning and Technology innovation using C#, ASP .NET, MVC, .NET Core, Entity Framework, Web API, LINQ, MVC, Angular, JavaScript, jQuery, IIS, HTML, XSLT, SQL Server, AJAX, WPF, WCF Core Technical Skill: C#.Net, Asp.Net MVC, Asp.Net MVC Core, ASP.net Web API, ASP.net Core Web API, Asp.Net Web Form, Web Service, Angularjs, Angular, React, NodeJS, VueJs, Vuetify, MSSQL Server, MySql, Oracle, ADO.Net, Entity Framework, LINQ, Ajax, JavaScript, JQuery, JSON, Crystal Report, RDLC, VSS,SVN, TFS, DevOps, AWS. Skills: .NET Platform ✅ ASP.NET Web Forms ✅ ASP.NET MVC and Web API ✅ ASP.NET Core ✅ Entity Framework Core ✅ ASP.NET Identity ✅ Windows Forms and WPF ✅ SignalR Databases ✅ Microsoft SQL Server ✅ Oracle ✅ MySQL ✅ MariaDB Third Party API Integration ✅ Marketplace APIs : Shopify | Amazon MWS | Walmart | Jet | OpenSky | eBay | Facebook | Google ✅ Shipping Carrier API integration : FedEx | USPS | UPS | ShipRocket ✅ Authentication using OAuth and other Technologies ✅ Other Custom API Integration in with Desktop App REST API Development ✅ Developed Custom Marketplace API using ASP.NET and .NET Core Async Programming ✅ For parallel Execution of processes, asynchronous programming is implemented Performance improvement ✅ XML based Data processing in SQL Server ✅ Query Optimization for large data and performance tuning ✅ Indexing and Re-indexing concepts implementation Server Management ✅ AWS, Azure, Digitalocean Droplets ✅ Version Control - Git, TFS, SVN. Cloud Platforms: ✅ Amazon Web Services: EC2, CodeDeploy, ELB, SNS, CloudWatch ✅ Microsoft Azure: App Service, Azure SQL, Azure ActiveDirectory Reporting Tools ✅ RDLC, Crystal Report , Telerik Reports Tools and IDEs ✅ Visual Studio ✅ SQL Server Management Studio 2008-2017 ✅ Visual Studio Code ✅ PL/SQL development ✅ MySQL Workbench ✅ Devart SQL Complete ✅ Visual Studio Extensions ✅ JetBrains ReSharper ✅ EF PowerTools Others ✅ Rotativa ✅ Kendo UI ✅ RestSharp ✅ RabbitMQ I have more than 13+ years of Hands-on Experience in Developing software using .NET Technologies, especially Using C#. ] Currently, I am working on Core Banking Solution. Solving complex problems is my passion and hobby. My goal is to help software design patterns and wring industry-standard code that meets business requirements and designing complex interfaces simple for the end-users. What I bring to the table are excellent communication skills, strong analytical thinking, creative problem solving, and the ability to inspire the team to perform at their best capacity. I'm looking forward to helping you solve your problems that meets business requirements.

I am a Senior Data Engineer and Microsoft Business Intelligence Specialist with 17+ years of experience designing, developing, and optimizing enterprise data solutions. I help organizations transform raw data into actionable insights by building scalable databases, modern data pipelines, business intelligence solutions, and automated reporting systems. My expertise covers the complete data lifecycle—from database architecture and ETL development to data warehousing, cloud data platforms, reporting, and business automation. I have successfully delivered enterprise solutions for manufacturing, ERP, healthcare, education, transportation, retail, and finance organizations. What I Can Help You With- • SQL Server database design, development, administration, and performance tuning • Complex T-SQL, stored procedures, views, functions, triggers, and indexing • ETL/ELT development using SSIS and Azure Data Factory • Data warehouse architecture, dimensional modeling, Star & Snowflake Schema • Microsoft Fabric and modern analytics solutions • Interactive Power BI dashboards, DAX, Power Query, KPI reporting, and semantic models • SSRS, RDLC, Crystal Reports, Paginated Reports, and Excel reporting • Azure SQL Database, Azure Managed Instance, and cloud data solutions • Data migration, integration, validation, automation, and performance optimization • ERP reporting and database support ## Core Technical Skills ## Data Engineering: SQL Server (2000–2022), SSIS, SSAS, SSRS, Data Warehousing, Data Modeling, DAX, Power Query, MDX, Query Optimization Cloud: Azure SQL Database, Azure Managed Instance, Azure Data Factory, Microsoft Fabric, OneLake, Power BI Service Development: ASP NOT NET Core, ASP DOT NET MVC, C#, Web API, Entity Framework, HTML5, CSS3, Bootstrap, jQuery ## Professional Experience ## Freelance Data Engineer & Microsoft BI Consultant (2021–Present) Working with international clients through Upwork and Fiverr to deliver SQL Server solutions, Power BI dashboards, ETL pipelines, Azure data integration, Microsoft Fabric analytics, ERP reporting, and database optimization. Raihana Consulting (Affiliated with Mizkan America, USA) | Senior Software Engineer (2011–2021) Designed enterprise SQL Server databases, SSIS packages, SSRS reports, Power BI dashboards, and reporting solutions for Microsoft Dynamics AX ERP. Served as the Lead Engineer for the Mizkan Report Manager Version 4, an enterprise reporting platform built with ASP DOT NET MVC, SQL Server, and SSRS. Ask Bangladesh Ltd. | Software Engineer (2010–2011) Developed ERP and business applications using C#, ASP DOT NET, SQL Server, Entity Framework, and Crystal Reports. IT Bangla Ltd. | Programmer & Technical Faculty (2008–2010) Developed software applications and delivered professional training on SQL Server, DOT NET, and database technologies. ## Selected Projects ## • Mizkan Report Manager for Microsoft Dynamics AX ERP • Executive BI Dashboards for Sales, Finance, Inventory, Production, and Purchasing • Manufacturing ERP Solutions for Textile Industry • Azure SQL Database & Azure Data Factory Integration • Vehicle Storage & Billing Management System • Enterprise SQL Server Data Warehouse Solutions ##Education & Certifications## Bachelor of Business Information Technology – University of Greenwich (UK) Diploma in Enterprise System Analysis and Design (ESAD) – IDB-BISEW ## Certifications ## Microsoft Certified Professional Developer (MCPD) Microsoft Certified Professional (MCP) Red Hat Certified Engineer (RHCE) ## Why Clients Choose Me ## ✔ 17+ years of enterprise data engineering experience ✔ Deep expertise across the Microsoft Data Platform ✔ Strong ERP and enterprise reporting background ✔ High-performance, scalable, and secure solutions ✔ Clear communication, reliable delivery, and long-term support Whether you need SQL Server optimization, Power BI dashboards, ETL pipelines, Azure data integration, Microsoft Fabric implementation, or enterprise reporting, I deliver reliable, scalable solutions that help businesses turn data into measurable value. Let's discuss how I can help your business make better decisions with data.

Senior Full Stack .NET Developer | ASP.NET Core | React | SQL Server I’m a Senior Full Stack .NET Developer specializing in building scalable, secure, high-performance, and maintainable software solutions for real-world business environments. I work across the complete software development lifecycle—from requirements analysis, database design, architecture, backend/API development, frontend implementation, testing, performance optimization, deployment, and production support. My core expertise includes C#, .NET, ASP.NET Core, ASP.NET MVC, Web API, WebForms, Entity Framework Core, ADO.NET, LINQ, SQL Server, REST APIs, React, Next.js, JavaScript, and TypeScript. 🚀 What I Do ✔ Build scalable enterprise web applications ✔ Develop secure ASP.NET Core Web APIs and REST services ✔ Create React/Next.js dashboards and business portals ✔ Optimize SQL Server databases and slow queries ✔ Modernize legacy ASP.NET WebForms and .NET Framework systems ✔ Design ERP, WMS, CRM, inventory, procurement, HR, finance, and logistics systems ✔ Integrate third-party APIs and external services ✔ Troubleshoot production issues and performance bottlenecks ✔ Implement authentication, authorization, and role-based security ✔ Deploy applications using IIS, Windows Server, Azure, AWS, and Docker 💻 Backend & API Development * C# / .NET / ASP.NET Core * ASP.NET MVC / Web API / Minimal APIs * ASP.NET WebForms / .NET Framework * RESTful API design and integration * Entity Framework Core, ADO.NET, LINQ * Dependency Injection and Middleware * JWT Authentication * ASP.NET Core Identity * OAuth 2.0 / OpenID Connect * API versioning, validation, pagination, filtering, and sorting * Background services and asynchronous processing ⚛️ Frontend Development * React * Next.js * JavaScript / TypeScript * HTML5 / CSS3 * Bootstrap / Tailwind CSS * Responsive web applications * Enterprise dashboards * DataTables, charts, reporting, and interactive interfaces * Legacy frontend modernization 🗄️ SQL Server & Performance Optimization Database and application performance are key areas of my expertise. I work with SQL Server, T-SQL, stored procedures, views, functions, CTEs, execution plans, indexing, query optimization, deadlock/blocking analysis, data migration, and large-volume processing. I investigate performance across the complete stack: Frontend → API → Business Logic → Data Access → SQL Server → Infrastructure I optimize slow queries, inefficient stored procedures, missing indexes, N+1 queries, excessive database calls, inefficient EF Core queries, slow APIs, memory/CPU consumption, and large data-processing workloads. My approach is data-driven: identify → measure → optimize → verify. 🏢 Enterprise Application Development I specialize in business systems including: * ERP & Business Management Systems * Warehouse Management Systems (WMS) * Inventory Management Systems * Procurement Management Systems * CRM Platforms * Financial & Accounting Systems * HR Management Systems * Healthcare Applications * Education Management Systems * Logistics & Supply Chain Platforms * Reporting & Analytics Dashboards * Workflow & Approval Systems * Customer & Administration Portals I focus on understanding the complete business workflow before designing the technical solution. 🏗️ Architecture & Engineering I use proven architectural principles based on project requirements and complexity: * Clean Architecture * Onion Architecture * Layered Architecture * Vertical Slice Architecture * Feature-Based Architecture * Domain-Driven Design (DDD) * CQRS * SOLID Principles * Design Patterns * Modular Architecture * Event-Driven Architecture * Microservices I avoid unnecessary complexity and select architecture based on maintainability, scalability, performance, and business value. 🔄 Legacy Modernization I help businesses modernize existing applications while protecting critical business logic: * ASP.NET WebForms → ASP.NET Core * .NET Framework → Modern .NET * Legacy VB/.NET modernization * Monolith refactoring * Legacy database optimization * API extraction * Authentication modernization * Frontend modernization * Incremental migration strategies My goal is to improve architecture, security, performance, and maintainability while minimizing business disruption. ☁️ Cloud, DevOps & Production Experience includes Azure, AWS, IIS, Windows Server, Docker, CI/CD, deployment, logging, monitoring, Redis, Azure Service Bus, Kafka, background workers, distributed caching, retry/resilience strategies, Outbox Pattern, and Saga Pattern. 🔐 Security I implement secure application practices including JWT, Identity, RBAC, OAuth 2.0, OpenID Connect, secure API design, validation, authorization, and secure data access. Why Work With Me? I don't just write code—I focus on solving the underlying business and technical problem. Let's build software that performs reliably today and scales confidently tomorrow.

🏆 Top Rated Plus Freelancer on Upwork 💼 57 Successfully Completed Projects 🕒 22,700+ Upwork Hours 💻 18+ Years of Professional Software Development Experience 🎓 B.Sc. in Computer Science & Engineering 👨‍💻 About Me: I help startups, SaaS companies, and enterprise organizations design, build, and scale modern web applications using React, Next.js, Vue.js, Angular, Node.js, TypeScript, MongoDB, and PostgreSQL. With more than 18 years of professional software development experience, I've built business-critical applications across healthcare, CRM, HR, education, marketing, analytics, customer experience, and SaaS platforms. My expertise covers the entire software development lifecycle—from architecture and database design to frontend development, backend APIs, cloud services, deployment, and long-term maintenance. I enjoy taking ownership of features from concept to production, collaborating closely with product teams, and building software that is scalable, maintainable, and delivers measurable business value. Whether you need a developer to extend an existing product or build a new platform from scratch, I can quickly understand your business requirements and deliver clean, production-ready solutions. 🚀 My Core Expertise: ⚙️ Full-Stack Development: ✓ React.js & Next.js ✓ Vue.js (Vuex, Nuxt.js, Vuetify) ✓ Angular & AngularJS (NgRx, RxJS) ✓ Node.js (Express.js, Sails.js, Hapi.js) ✓ TypeScript & Modern JavaScript (ES6+) ✓ MongoDB, PostgreSQL, MySQL, SQL Server ✓ REST APIs & GraphQL 🖥️ I Can Help You Build: ✓ SaaS Platforms ✓ Enterprise Web Applications ✓ AI-Assisted Applications ✓ CRM & ERP Systems ✓ Healthcare Applications ✓ Business Automation Tools ✓ Internal Dashboards & Admin Portals ✓ Reporting & Analytics Platforms ✓ Real-time Applications ✓ Third-Party API Integrations ⭐ Why Clients Hire Me? ✓ 18+ years of hands-on software development experience ✓ Strong expertise across React, Vue, Angular, Node.js, and modern JavaScript ecosystems ✓ Ability to own features end-to-end—from requirements and architecture to deployment ✓ Clean, scalable, and maintainable code following best engineering practices ✓ Excellent communication and fluent English ✓ Fast learner who quickly adapts to new technologies and business domains ✓ Thorough testing and attention to detail before every delivery ✓ Long-term, reliable technical partner 💼 Career Highlights: Throughout my career, I've worked with startups, scale-ups, and enterprise organizations across multiple industries, including healthcare, education, customer experience, HR, marketing, and SaaS. 🤝 Some organizations I've collaborated with: • InMoment • HawarIT • OpenLM • Divups • Pipedrive • CRI Agence • MyLearningPlan • Frontline Education • KillBill I'm also the author of "ExtJS 4 Plugin and Extension Development", published by Packt Publishing, reflecting my passion for software engineering and knowledge sharing. 🛠 Technical Expertise: 🎨 Frontend: • React.js • Next.js • Vue.js (Vuex, Nuxt.js, Vuetify) • Angular & AngularJS • TypeScript • JavaScript (ES6+) • Tailwind CSS • Bootstrap • Material UI • Sass / Less • GraphQL • D3.js • WebSocket / SocketIO • Google Maps API • ESRI • OpenLayers 🧩 Backend: • Node.js • Express.js • Sails.js • Hapi.js • REST APIs • GraphQL APIs • BullMQ • SocketIO • AWS Lambda • Mongoose • Sequelize 🗄️ Databases: • MongoDB • PostgreSQL • MySQL • Microsoft SQL Server • Redis • Firebase Firestore ☁️ Cloud & Infrastructure: • AWS (S3, EC2, Lambda) • MongoDB Atlas • Vercel • Netlify 🤖 AI & Third-Party Integrations: • OpenAI APIs • Google Maps Platform • Amazon S3 • QuickBooks • Facebook APIs • Dropbox APIs • Payment Gateway Integrations • Custom REST & GraphQL APIs 🧰 Development Tools: • GitHub • GitLab • Bitbucket • Jira • Trello • Asana • Figma • Agile / Scrum • CI/CD 📚 My Development Philosophy: I believe great software is more than just working code—it's about solving the right business problem with a solution that is reliable, maintainable, and built to scale. I work closely with clients to understand their goals, contribute to technical decisions, identify potential risks early, and deliver production-ready solutions that create long-term value. 🤝 Let's Build Something Great: Whether you're building a SaaS product, modernizing an existing application, integrating third-party services, or expanding your engineering team, I'd be happy to help. Let's discuss your project and turn your ideas into reliable, scalable software.

Hi there! I’m Salimullah - a Senior Data Services Engineer with a strong focus on API integration, SQL development, and process automation. I help businesses connect their systems, streamline data flow, and ensure reliable, high-performing backend operations. With a deep understanding of SQL Server, C#, and RESTful APIs, I build and optimize data pipelines that just work - cleanly, securely, and efficiently. Core Skills & Expertise: • API development & integration (REST, XML, JSON) • SQL optimization (CTEs, stored procedures, query tuning) • Data validation, automation & transformation • C# backend logic for data handling and logging • Azure Functions, API calls, and error handling • Data consistency & performance monitoring What sets me apart: I don’t just connect systems - I make sure every piece of data moves with purpose and accuracy. I’m detail-oriented, proactive in solving problems, and easy to communicate with. My approach combines strong technical skill with a practical mindset to ensure smooth, real-world results. If you’re looking for a developer who can integrate APIs, optimize databases, and automate your data flow with minimal supervision, let’s collaborate and get it done right.