Primal-Dual Simplex Algorithm Implementation

I need an experienced C programmer to work on a task related to optimization, specifically focusing on the implementation of the Primal Dual Simplex algorithm. Here is what the task entails:

- Implementing the Primal Dual Simplex algorithm in C programming language.
- The implemented algorithm must be scalable, capable of handling large-scale problems.
- Emphasis should be placed on the speed and efficiency of the code.
- The program should be designed to read input from files, and write the output results to files.

Ideal skills for this project:
- Proficiency in C programming language
- Understanding and experience in Linear Programming
- Ability to implement scalable and efficient optimization algorithms
- Experience with file input/output operations in C

The project will be deemed successful when the Primal Dual Simplex algorithm is implemented accurately and efficiently in C, and is able to perform large scale calculations by reading input from and writing output to files.