I am the sole programmer and support for a very large companies production system. The company has flagged the problem and has tried to re-write the system for

I am the sole programmer and support for a very large companies production system. The company has flagged the problem and has tried to re-write the system for several years but have never managed to retain a coherent programming team long enough to see the project through nor found a suitable replacement in the market. Luckily for them I am a contractor not an employee but there are definitely grey areas.