Senior .NET Engineer

What is to be done

•     Decompile the .NET binaries and read the code (ILSpy, dotPeek or similar).

•     Review any remaining Classic ASP pages and ASPX sources on the server.

•     Map the database: schemas, stored procedures, SSIS packages, SQL Agent jobs, replication.

•     Reconstruct the business logic of each module: data collection, data services, reporting, archiving, user management.

•     Document every integration from the application side, including aviation feeds such as Type B messages and ACARS.

•     Interview users, the administrator, finance, and the teams using the other endpoints of each interface.

•     Write the FSD, Integration Register and Data Dictionary.

•     Work read-only on production. Report progress daily.

The three months

Period

Focus

Hand over

Month 1

Obtain access. Decompile the binaries, map the database, build a first picture of the application.

Application inventory, decompiled code baseline

Month 2

Work through the system module by module. Interview users, the admin, finance and the teams using each interface.

FSD drafts, integration register v1

Month 3

Complete and validate everything. Hand over the final documents and brief the decision gate.

Final FSD, Integration Register, Data Dictionary

Requirements

Must have

•     7+ years of .NET, with real depth in the Framework era — C# and VB.NET, ASP.NET WebForms.

•     Hands-on reverse-engineering experience: decompiled and understood production systems with no source and no documentation.

•     Strong SQL Server: T-SQL, stored procedures, SSIS, SQL Agent, replication.

•     Integration experience: APIs, SFTP, file exchange and direct database links.

•     Strong technical writing — we will ask to see examples of created documents.

•     Fluent English and availability to work on-site in Cairo full-time.

Nice to have

•     Airline systems background: Type B messages, ACARS, SSIM, Amadeus, Lido, AMOS or SAP.

•     Arabic.

•     Classic ASP, SSRS or Crystal Reports.

•     Previous legacy modernisation or migration work.

Who fits

•     Comfortable working in ambiguity — nothing is written down and there is no one to ask.

•     Patient with people, precise with facts.

•     Careful and discreet: sensitive data, read-only discipline, no risky moves on production.

•     Honest daily and weekly reporting — no surprises at the monthly reviews.