Sayed is available for hire

Sayed Ahmad

Verified Expert in Engineering

Full-stack Developer

Dhaka, Dhaka Division, Bangladesh

Toptal member since September 15, 2022

Expertise

Web Development Back-end Developers Algorithms Front End Full-stack API CSS Apache Cordova WebAssembly Windows Development SSO Engineering Database

Bio

Sayed is a full-stack .NET developer with six years of experience focusing on analyzing requirements, designing and building large-scale distributed systems with Azure technologies, and developing microservices. He has contributed to all parts of the SDLC, including architectural design, and worked with a wide range of technologies and industries. Sayed has sound knowledge of algorithms and data structures, excellent problem-solving skills, and a bachelor's degree in computer science.

Portfolio

Ecognition Labs

.NET 8, Azure, MongoDB, Kubernetes, DevOps, AI Prompts, Neo4j, Data Pipelines...

CurrentWave AI LLC

CSS, Blazor, .NET, HTML, WebAssembly (Wasm), Azure SSO, Single Sign-on (SSO)

Enosis Solutions

Architecture, Azure, .NET, Azure Cosmos DB, Docker, Azure Service Bus...

Experience

Microsoft SQL Server - 5 years
Data Structures - 5 years
REST APIs - 5 years
JavaScript - 5 years
C# - 5 years
ASP.NET Core - 5 years
Back-end Development - 5 years
Angular - 3 years

Preferred Environment

Windows 11, Google Meet, Visual Studio, Windows 10

The most amazing...

...thing I've done was scale a system, enabling it to send 20 times more emails than it could before.

Work Experience

Senior Software Engineer

2024 - PRESENT

Ecognition Labs

Designed and implemented the complete back-end architecture of an AI-powered document abstraction system.
Built a high-performance, scalable document-processing pipeline using TPL Dataflow and Azure Service Bus for seamless inter-pipeline communication.
Designed document and user data models in MongoDB and implemented secure authentication using ASP.NET Core Identity with JWT.
Developed a Google Drive–like file management system using Neo4j, efficiently handling hierarchical folder and file relationships.
Implemented advanced sharing features, including “Shared With Me” functionality for collaborative document access.
Led requirement analysis sessions and collaborated closely with stakeholders to define project scope, milestones, and deliverables.
Managed task planning, estimation, and sprint execution for large-scale systems using Jira Boards.
Deployed both front-end and back-end applications to Azure Kubernetes Service (AKS) and established CI/CD pipelines for automated deployments and updates.
Conducted technical interviews and participated in evaluating candidates for key engineering roles.

Technologies: .NET 8, Azure, MongoDB, Kubernetes, DevOps, AI Prompts, Neo4j, Data Pipelines, Optical Character Recognition (OCR), .NET 10, xUnit.net

Front-end Developer

2023 - 2025

CurrentWave AI LLC

Built a fully responsive AI-powered web application from scratch using Blazor WebAssembly (.NET 7), ensuring a smooth and consistent experience across all devices.
Developed a customizable chatbot, deployed via CDN, allowing effortless integration into any website.
Created and maintained RESTful APIs to manage and automate administrative operations within the AI platform.
Integrated Azure Application Insights and implemented detailed logging for proactive monitoring and issue tracing in production.
Designed and implemented a multi-stage, highly scalable document-processing architecture using Azure Functions, Azure Queue, and Azure Blob Storage, enabling efficient vector embedding and RAG-based retrieval that improved AI response quality.
Built automated jobs to retrieve data scraped by Affify and ingest it into the pipeline for downstream processing.
Integrated SharePoint and Confluence to automatically traverse and ingest documents from various customer data sources into the unified pipeline.
Implemented SSO authentication using Azure AD B2C, ensuring secure and seamless user access across applications.

Technologies: CSS, Blazor, .NET, HTML, WebAssembly (Wasm), Azure SSO, Single Sign-on (SSO)

Software Technical Lead

2023 - 2024

Enosis Solutions

Designed and developed a highly scalable containerized messaging microservice to send millions of messages. Used Azure, Service Bus, Event Hub, Azure Container, Azure Cosmos DB, Dapr, gRPC, Open API, Twilio, and SendGrid.
Integrated the microservice into the existing system and built the campaign-based messaging system using it.
Managed two .NET development teams of 18 members.

Technologies: Architecture, Azure, .NET, Azure Cosmos DB, Docker, Azure Service Bus, Azure Event Hubs, Dapr, gRPC, Twilio, SendGrid, Azure SQL, UI Components, Web Scraping

PowerShell Expert| Hr

2023 - 2023

Nuovo Photography Inc

Wrote PowerShell Script to install multiple applications for Windows 11.
Created PowerShell Script to remove all bloatware from Windows 11.
Fixed existing Windows 10 PowerShell Script, which was not working for Windows 11.

Technologies: Windows PowerShell, Windows System Administration, Windows 10, Windows 11, SQL

Senior Software Engineer

2021 - 2023

Enosis Solutions

Contributed to all stages of software development, including designing and developing new features, integrating third-party services, and maintaining the existing codebase.
Designed the codebase using the Singleton, Adapter, and Façade design patterns and principles.
Performed requirements analysis through written and oral communication with the client and executed the analysis toward the development.
Led a team of nine .NET developers to build the application from scratch, upgrade to newer .NET core versions, implement new features, and improve the security and overall performance of the application.
Designed and developed the architecture of an email microservice integration into the existing promotional mailing module.
Troubleshot technical and functional issues and coordinated resolution with development and Tier 3 teams.
Designed and developed RESTful web APIs and databases while ensuring quality performance, reliability, and security.
Reduced the email template rendering by more than 500% by optimizing the underlying stored procedure. Scaled the system to send emails or SMS to millions of people by introducing Azure Service Bus, Functions, and WebJobs.
Migrated two existing projects with Azure technologies and deployed them into Azure App Service.

Technologies: ASP.NET Core, Microsoft SQL Server, C#, Azure App Service, SignalR, Amazon S3 (AWS S3), SQL Server Reporting Services (SSRS), .NET, ASP.NET, ASP.NET MVC, Entity Framework, .NET Core, ASP.NET Web Forms, Visual Basic .NET (VB.NET), Azure, Azure Cloud Services, SQL Server 2016, SQL Server Integration Services (SSIS), C#.NET, Amazon Web Services (AWS), Microsoft Azure, HTML5, Git, Bootstrap, REST APIs, Azure DevOps Services, REST, Agile, Jira, .NET 6, SOAP, MVC Design, SOLID Principles, APIs, HTTP, JSON, Front-end, Visual Basic 6 (VB6), Active Server Pages (ASP), Visual Basic, PDF, PHP, Authentication, Back-end, Visual Studio 2019, Troubleshooting, Root-cause Analysis (RCA), CSS3 Animation, HTTP Server, Azure Service Bus, Data Pipelines, Webhooks, Message Queues, Bitbucket, Web API, .NET 4, Model View Controller (MVC), Ajax, Web Development, Dapper, Data Structures, Back-end Development, CSS, JSON Web Tokens (JWT), SQL, Windows Forms (WinForms), API Management, Azure Cosmos DB, Desktop App Development, Full-stack, User Interface (UI), HTML, TypeScript, jsPDF, PDF Design, GitHub, Microsoft Visual Studio, Windows Presentation Foundation (WPF), Third-party APIs, Amazon, eCommerce, Architecture, Front-end Development, Razor, Performance, Web Technologies, IIS SQL Server, ADO.NET, Entity, Virtual Machines, Windows PowerShell, ASP.NET Web API, Azure Logic Apps, WebAssembly (Wasm), Blazor, VB.NET, Microsoft Stack, Database Architecture, Microsoft Excel, Reports, Spreadsheets, Stripe Connect, Stripe API, Stripe, AngularJS, UI Components, Microsoft Power BI, Data Engineering

Software Engineer II

2020 - 2021

Enosis Solutions

Implemented standard software engineering methodologies, unit testing, code reviews, and design documentation.
Developed a referral management system, including the front end, with the help of a ZIP code API to refer patients to the nearest doctor using C#.NET, MVC architecture, JavaScript, and jQuery. Also developed a public portal to see all referrals.
Refactored two legacy projects and upgraded them to modern .NET MVC architecture.
Performed written communication, estimation, and task breakdown.
Implemented encryption and decryption functionality to transfer data securely over the network using CryptoJS.
Migrated the entire project to support the Canadian culture.

Technologies: ASP.NET Core, Git, NUnit, Moq, Microsoft SQL Server, Ionic 4, Angular, .NET, ASP.NET, ASP.NET MVC, ASP.NET Web Forms, Visual Basic .NET (VB.NET), SQL Server 2016, C#, C#.NET, HTML5, Bootstrap, REST APIs, .NET Core, REST, Windows Desktop Software, Desktop App Development, Agile, Jira, .NET 6, Stripe Payments, SOAP, MVC Design, SOLID Principles, APIs, HTTP, JSON, Front-end, Visual Basic 6 (VB6), Active Server Pages (ASP), Visual Basic, PDF, Authentication, Back-end, Visual Studio 2019, Transact-SQL (T-SQL), Troubleshooting, Root-cause Analysis (RCA), CSS3 Animation, HTTP Server, Cordova, Web API, .NET 4, Model View Controller (MVC), Ajax, Web Development, Dapper, Data Structures, Back-end Development, CSS, SQL, API Management, Azure Cosmos DB, Full-stack, User Interface (UI), HTML, TypeScript, jsPDF, PDF Design, GitHub, Microsoft Visual Studio, Windows Presentation Foundation (WPF), Third-party APIs, Amazon, eCommerce, Architecture, Front-end Development, Razor, Performance, Web Technologies, IIS SQL Server, ADO.NET, ASP.NET Web API, VB.NET, Web Forms, Microsoft Stack, Database Architecture, Microsoft Excel, Reports, Spreadsheets, Stripe Connect, Stripe API, Stripe, AngularJS, Windows Services, UI Components, Data Engineering

Software Engineer I

2019 - 2020

Enosis Solutions

Translated designs into front-end code and integrated the front end with the back end.
Designed and developed a fully responsive UI for the login and landing pages.
Wrote unit tests for the existing codebase and used them to verify the business logic.
Designed a code library for rendering third-party, interactive charting using SVG in Ionic and Angular.

Technologies: Angular, Ionic 4, NUnit, PostgreSQL, .NET, ASP.NET, ASP.NET MVC, ASP.NET Web Forms, Visual Basic .NET (VB.NET), SQL Server 2016, C#, C#.NET, TypeScript, HTML5, Angular Material, Angular Bootstrap, Git, Bootstrap, REST APIs, .NET Core, Visual Studio 2016, REST, Ionic, Agile, Jira, SOAP, MVC Design, SOLID Principles, APIs, HTTP, JSON, Front-end, Visual Basic 6 (VB6), Active Server Pages (ASP), Visual Basic, PDF, Authentication, Back-end, SCSS, RxJS, VB.NET WinForms, Visual Studio 2019, Troubleshooting, Root-cause Analysis (RCA), CSS3 Animation, HTTP Server, Cordova, Web API, .NET 4, Model View Controller (MVC), Ajax, Web Development, Dapper, Data Structures, Back-end Development, CSS, JSON Web Tokens (JWT), SQL, Desktop App Development, Full-stack, User Interface (UI), HTML, jsPDF, PDF Design, GitHub, Microsoft Visual Studio, Third-party APIs, Amazon, eCommerce, Architecture, Front-end Development, Razor, React, Web Technologies, IIS SQL Server, ADO.NET, Entity, ASP.NET Web API, VB.NET, Microsoft Stack, Microsoft Excel, Reports, Spreadsheets, Windows Services, UI Components, Microsoft Access

Junior .NET Software Engineer

2018 - 2019

Black Stone

Analyzed business requirements to determine project scopes and objectives to deliver high-quality solutions within deadlines.
Created requirements and designed specifications from high-level requirements.
Translated designs into functional front-end code.
Developed a Windows service and installer project to pull customer data periodically from supermarkets at different locations, using Nimble APIs, and sync the database accordingly.

Technologies: JavaScript, HTML, SQL Server 2016, JSON, ASP.NET, jQuery, Web API, Ajax, Web Development, Back-end Development, CSS, SQL, HTML5, Microsoft Visual Studio, ASP.NET Web API, Microsoft Stack, Reports

Experience

Dental Practice Management Solution

I worked with one of the most prestigious providers of dental software solutions. This project involved a software solution with millions of patient records that allowed 50,000 simultaneous users. I developed this application using the SaaS distribution model, ASP.NET Core, SQL, and Microsoft Azure cloud technologies. I also integrated a payment gateway for the OpenEdge Vx805 swipe card system.

Multi-vendor eCommerce System

A customizable and intuitive online order management system used to create eCommerce websites for restaurants and takeaways across the UK, including those with multiple locations. I worked on the entire lifecycle of this project.

Notification Hub

A desktop-based application that allows users to manage all notifications under one umbrella so that developers don't miss any important notifications from Slack, Microsoft Teams, Jira, Confluence, and Azure DevOps, which can prevent significant delays in the development process. I also added a reminder feature so users can set quick reminders for any notifications while they are in the middle of an urgent task.

Quiz Builder Web API

A C# ASP.NET Core-based web API application for creating and participating in quizzes. I implemented all the API endpoints as RESTful and used the Microsoft identity platform with JWT for authentication.

Nimble MCA Customer Service

A C#-based Windows service I developed to periodically pull customer data from supermarkets at different locations, with the help of Nimble APIs, and sync the database accordingly. I also developed an installer to install the service.

Human Resources Management System

A project that involved a C#, .NET Core, and RESTful API. I wrote unit tests for all endpoints, including authentication, authorization, and business logic verification. This project required me to use NUnit and Moq proficiently.

Real-time Code Collaboration Tool

A distributed, real-time code collaboration tool with a code-sharing feature. I developed the tool, added a load balancer to redirect user requests to multiple servers using Nginx, and used Apache Hbase for better database performance.

Order Management System

https://github.com/sayedgkm/SalesOrderManagement

A . NET-based Sales Order Management Blazor WebAssembly web application. Used Onion architecture and implemented BLL and DAL layers in the back end. Created REST APIs for GET, POST, PUT, and DELETE. Used Entity Framework Core to create a database.

Education

2014 - 2018

Bachelor's Degree in Computer Science

Military Institute of Science and Technology - Dhaka, Bangladesh

Certifications

JULY 2021 - PRESENT

Web Application Security with OWASP Top 10 Advanced

eduCBA

Skills

Libraries/APIs

REST APIs, SignalR, jQuery, Entity Framework, Web API, Windows Forms (WinForms), jsPDF, Stripe Connect, Stripe API, Stripe, Moq, React, RxJS, Log4Net, Azure Blob Storage API, Dapr

Tools

Dapper, Git, TFS, Visual Studio, Azure App Service, Azure DevOps Services, Jira, Visual Studio 2019, Bitbucket, GitHub, Microsoft Visual Studio, Microsoft Excel, Spreadsheets, Azure Logic Apps, Microsoft Power BI, xUnit.net, Google Meet, Skype, NGINX, xUnit, Azure Key Vault, Azure Application Insights, OpenEdge, SendGrid, Microsoft Access, AI Prompts

Languages

JavaScript, CSS, C#, C++11, SQL, HTML, SCSS, Visual Basic .NET (VB.NET), C#.NET, TypeScript, VB.NET, Visual Basic 6 (VB6), Active Server Pages (ASP), Visual Basic, Transact-SQL (T-SQL), HTML5, PHP

Frameworks

ASP.NET Core, JSON Web Tokens (JWT), Angular, Entity Framework Core, .NET, ASP.NET, ASP.NET MVC, .NET Core, .NET 6, VB.NET WinForms, .NET 4, Windows Presentation Foundation (WPF), Razor, ADO.NET, Entity, ASP.NET Web API, Blazor, AngularJS, NUnit, ASP.NET Web Forms, Angular Material, Bootstrap, Ionic, Windows PowerShell, Ionic 4, Ionic 3, gRPC, .NET 8

Paradigms

HTML DOM, REST, Agile, MVC Design, Model View Controller (MVC), Azure DevOps, Desktop App Development, DevOps

Platforms

Visual Studio 2016, Amazon, Azure, Amazon Web Services (AWS), Azure Functions, Docker, Windows Server, AWS Lambda, Azure Event Hubs, Twilio, Kubernetes

Storage

Microsoft SQL Server, SQL Server 2016, JSON, Data Pipelines, IIS SQL Server, Database Architecture, Azure SQL, SQL Server Integration Services (SSIS), MySQL, Azure Cosmos DB, Web Forms, HBase, Amazon S3 (AWS S3), SQL Server Reporting Services (SSRS), PostgreSQL, Azure Cloud Services, MongoDB, Neo4j

Other

Algorithms, Data Structures, Web Development, Windows 11, Back-end Development, APIs, SOAP, SOLID Principles, HTTP, Front-end, PDF, Authentication, Back-end, Troubleshooting, Root-cause Analysis (RCA), CSS3 Animation, HTTP Server, Cordova, Webhooks, Message Queues, API Management, Full-stack, User Interface (UI), PDF Design, Third-party APIs, eCommerce, Architecture, Front-end Development, Performance, Web Technologies, WebAssembly (Wasm), Reports, Windows Services, UI Components, .NET 10, Single Sign-on (SSO), Angular Bootstrap, Windows Desktop Software, Stripe Payments, Azure Service Bus, Ajax, Virtual Machines, Microsoft Stack, Web Scraping, Data Engineering, Azure SSO, Documentation, Windows 10, Web Security, Vulnerability Identification, Microsoft Azure, Verifone VX805, SVG, Windows System Administration, Optical Character Recognition (OCR)

Collaboration That Works

How to Work with Toptal

Toptal matches you directly with global industry experts from our network in hours—not weeks or months.

Share your needs

Discuss your requirements and refine your scope in a call with a Toptal domain expert.

Choose your talent

Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.

Start your risk-free talent trial

Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.

Top talent is in high demand.

Start hiring