Senior Software Engineer - Enterprise SaaS & Cloud-Native Architect

Saif Rehman

Senior Software Engineer

**********.***@*****.*** linkedin.com/in/saif-rehman-6801bb38b https://saif-rehman-folio.lovable.app

Senior Full Stack Engineer with 7+ years of experience architecting and scaling enterprise SaaS platforms, microservices ecosystems, and multi-tenant applications using .NET and Azure. Proven track record of improving system performance

(30–50%), reducing operational overhead, and delivering high-availability solutions (99.9% uptime). Specialized in distributed systems, API design, and cloud-native development. Skills

Languages

Languages: C#, TypeScript,

JavaScript, JSON, XML, SQL

Database

SQL Server, T-SQL, Indexing, Query

Optimization, Mongo Db

Tools

Git, Swagger, Jira, Postman, xUnit

Frontend

Angular, React, RxJS, NgRx, NextJs,

HTML5, SCSS, Bootstrap, Material UI

Cloud & DevOps

Azure, Docker, Kubernetes (AKS), CI/

CD (Azure DevOps, GitHub Actions)

Backend

ASP.NET Core, Web API, Entity

Framework Core, GraphQL, SignalR

Architecture

Microservices, Event-Driven, Clean

Architecture, Multi-Tenant Systems

Professional Experience

Senior Software Engineer, Nextbridge 12/2023 – Present

•Led end-to-end development of enterprise SaaS platforms (BLOCKSPOS, BLOCKS-DAILYBOOK, BLOCK-ECom, BLOCKSQSR) using C#, ASP.NET Core, Angular, React, SQL Server, and Entity Framework Core, supporting users and improving transaction processing efficiency by ~20% across retail and financial workflows.

•Architected scalable microservices-based systems with API Gateway and event-driven architecture, implementing secure authentication and authorization using JWT, OAuth 2.0, and Azure AD B2C, enhancing system security and enabling seamless multi-tenant support.

•Built reactive and responsive front-end modules with Angular, React, RxJS, NgRx, SCSS, and Material UI; integrated payment gateways, webhooks, and automated financial workflows using Hangfire.

•Configured CI/CD pipelines with Azure DevOps, Docker, GitHub Actions; maintained code quality with Swagger, Postman, xUnit, and mentored junior engineers on modern full-stack best practices.

•Mentored junior engineers on modern full-stack architecture, clean code principles, and best practices, improving team productivity and reducing onboarding time by ~25%. Software Engineer, Sizdom Technologies - Remote 07/2020 – 11/2023

•Delivered Clinic Management and Stock Management systems using C#, ASP.NET Core, Angular, React, and SQL Server, improving operational efficiency by ~10% and reducing manual processing time by ~20% through automation and streamlined workflows; built modular, responsive UIs using RxJS and Bootstrap 5.

•Developed ASP.NET Core Web APIs with repository/service layers using C#, real-time notifications via SignalR, and multi-role authentication using Identity Server 4/JWT.

•Enhanced database and application performance using C#, Entity Framework Core, LINQ, SQL Server stored procedures, Redis caching, SQL Server indexing, implemented GraphQL/REST APIs and indexing deployed Dockerized microservices to Kubernetes (AKS).

•Managed CI/CD pipelines using GitLab, Azure App Services, and IIS; wrote unit and integration tests with xUnit and documented APIs with Swagger.

Associate software Engineer, iTechDoor 08/2018 – 06/2020

•Engineered scalable web applications and RESTful APIs using ASP.NET MVC, ASP.NET Web API, C#, Angular, React, and SQL Server, improving application performance and reducing page load times through optimized component rendering and efficient backend logic.

•Designed and developed a Blog Management System with JWT-based authentication and role-based access control

(RBAC), supporting 1,000+ users and improving secure access management while enabling faster content updates via dynamic rendering with AJAX/JavaScript.

•Optimized database performance and query execution using Entity Framework, LINQ, SQL Server (joins, stored procedures), reducing query execution time and improving data retrieval efficiency for high-volume operations.

•Conducted functional, integration, and API testing using Postman, Swagger, and Fiddler, identifying and resolving 90%+ of critical bugs pre-deployment, significantly reducing production issues.

•Managed version control and deployment pipelines using Git and Bitbucket, and deployed applications on IIS, achieving 99.9% uptime and reducing deployment time by ~10% through streamlined release processes.

•Collaborated in Agile Scrum environments, participating in sprint planning, stand-ups, and code reviews, contributing to 10% faster sprint delivery and improved code quality across releases. Education

Bachelor of Science in Information Technology, Punjab University Projects

Enterprise SaaS Platforms

Angular · RxJS · NgRx · ASP.NET Core · C# · SQL Server · Entity Framework

•BLOCKSPOS & BLOCKSQSR: Scalable POS systems for multi-location and quick-service restaurants; handled purchase, inventory, billing, ledgers, and kitchen coordination.

•BLOCKS-DAILYBOOK: Smart daily ledger for sales tracking, reporting, and real-time insights.

•BLOCK-ECom: E-commerce platform with product management, order tracking, and secure payment gateway integration.

IBIS HR – HR Management System

ASP.NET Core · C# · Angular · ASP.NET Zero · SQL Server · Identity · Crystal Reports Developed a comprehensive HR management system centralizing employee onboarding, leave management, payroll, and performance tracking. Streamlined HR processes and reduced manual workload by automating workflows. Fast Lane – Compliance One (KYC/KYB & AML Automation) ASP.NET Zero · .NET Core · Angular · SQL Server · JWT · OAuth 2.0 Solution for finance, insurance, and fintech industries to streamline onboarding, automate compliance checks, and mitigate legal risks.

Array Corp – Workforce Management SaaS Platform

ASP.NET Core · ASP.NET Zero · Angular · SQL Server · Microservices · REST APIs Led end-to-end development of a secure SaaS platform automating attendance tracking, time card approvals, and payroll processing. Improved accuracy and compliance while reducing manual errors. Healthcare & Inventory Management

Angular · .NET Core · SQL Server · Entity Framework

•Clinic Management System: Full-stack solution for patient records, doctor schedules, billing, and appointments with secure data flow.

•Stock Management System: Inventory management with real-time stock tracking, reporting, and optimized database performance.

Web & UI Projects

HTML5 · CSS3 · JavaScript · Bootstrap

•Blogs App: Role-based blogging platform with authentication and CRUD functionality.

•Custom Designs: Responsive, cross-browser UI layouts with reusable components.

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