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 dailyThe three monthsPeriodFocusHand overMonth 1Obtain access. Decompile the binaries, map the database, build a first picture of the application.Application inventory, decompiled code baselineMonth 2Work through the system module by module. Interview users, the admin, finance and the teams using each interface.FSD drafts, integration register v1Month 3Complete and validate everything. Hand over the final documents and brief the decision gate.Final FSD, Integration Register, Data DictionaryRequirementsMust 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-timeNice 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 workWho 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