Saifullah Abrar's Work | ContraWork by Saifullah Abrar
Saifullah Abrar

Saifullah Abrar

Software Engineer with 6+ years of experience in .Net

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Followed by GALLERY L and Adnan I

Islamabad, Pakistan

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Islamabad, Pakistan

Cover image for Backend .NET Developer | Travel
Backend .NET Developer | Travel Tech & Airline Integrations I worked on the backend of TravelUstaad.com (http://TravelUstaad.com), a travel booking platform with a B2B portal used by travel agents to book flights for their customers. My main focus was integrating airline and GDS systems, including: Galileo (Travelport) GDS for access to international airline fares and availability. HITIT, the airline reservation system used by several carriers. Airline integrations for AirSial and Airblue. Through these integrations, I built the complete booking flow: flight search, booking, PNR import, and ticket issuance. I also managed the backend workflows behind the B2B agent portal, so agents can search fares across multiple airlines in one place, create or import bookings, and issue tickets without switching between different airline systems. Tech stack: .NET Core, Entity Framework Core, ADO.Net (https://ADO.Net) , SQL Server, Caching, Serilog, Domain-Driven Design (DDD), Clean Architecture, SOLID principles, Azure. If you're building a travel platform, such as an online travel agency, a B2B agent portal, or a booking engine, or you need to integrate GDS or airline APIs, I can help you build a fast and reliable .NET backend.
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Cover image for Backend .NET Developer | Healthcare
Backend .NET Developer | Healthcare & EHR Systems I worked on multiple modules of talkEHR, a cloud- and AI-based Electronic Health Records (EHR) platform used by medical practices across the U.S. My work included: AI-powered patient demographics: capturing and managing patient information automatically to reduce manual data entry during registration. Telehealth appointments: scheduling and managing virtual visits connected directly to the patient's chart. E-prescription workflows: handling the full prescription process digitally, from the doctor's order to the pharmacy. HL7 FHIR APIs: building standards-based APIs so patient data can be exchanged securely with labs, other EHR systems, and third-party apps. I also contributed to other clinical and practice management features, with a strong focus on data security, performance, and healthcare interoperability. Tech stack: .NET Core, Entity Framework Core, Dapper, SQL Server, Redis, Serilog, HL7 FHIR, Clean Architecture, SOLID principles, CI/CD, AWS, and Azure. If you're building a healthcare product, such as an EHR, telehealth platform, patient portal, or any system that needs FHIR integration, I can help you build a secure and reliable .NET backend.
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Cover image for Backend .NET Developer | Automotive
Backend .NET Developer | Automotive Lease & Finance Platforms I worked on the backend of Brelli.nl (http://Brelli.nl), a Dutch lease management platform that makes financial lease simpler for car dealers, their customers, and the banks that finance them. Instead of handling applications through emails, paperwork, and separate systems, dealers manage the whole process in one place, from selecting the vehicle to submitting the financing application and tracking its approval. The platform connects all three parties and integrates with dealers' vehicle stock systems, so lease deals move faster and everyone has a clear view of each application's status. Tech stack: .NET Core, Entity Framework Core, Dapper, SQL Server, Redis, Serilog, Clean Architecture, SOLID principles, CI/CD, AWS, and Azure. If you're building a platform for leasing, financing, or the automotive industry, or any system that connects multiple parties through one workflow, I can help you build a reliable and scalable .NET backend.
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Backend .NET Developer | ERP & E-Invoicing Systems I developed the backend of invoicss.com (http://invoicss.com), a centralized ERP platform for sales invoicing and tax compliance. Businesses create their invoices once, and the system automatically calculates VAT and submits each invoice directly to the relevant national tax authority, so there is no need to log into government portals or re-enter data by hand. It brings the full workflow (invoice creation, tax calculation, validation, submission, and status tracking) into one place and follows each country's required e-invoicing standards. Tech stack: .NET Core, Entity Framework Core, Dapper, SQL Server, Redis, Serilog, Clean Architecture, SOLID principles, CI/CD, AWS, and Azure. If you need a reliable, scalable .NET backend, especially for invoicing, finance, or compliance-heavy systems, I'd be glad to help you build it.
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