Not all automated trading or quantitative finance is high-frequency. A bank trading exotic derivatives OTC could use C# to generate quotes without a problem.

Not all automated trading or quantitative finance is high-frequency. A bank trading exotic derivatives OTC could use C# to generate quotes without a problem. There are at least a couple reputable prop groups I know of that use C# in real-time trading systems, but both are running more quantitative long-term strategies in options.