depends on the desk and division. Global markets does there execution business to drive price execution improvements, liquidity seeking algos mostly.

QIS - quant investment management services is more asset management using data science.

they dont do hft, thats more Millenium or point72, maybe citidel.

end of day they use tech to drive reduced cogs and keep in clients. the front office folks bake off against Morgan Stanley, UBS, et all to offer bespoke products that are ' new and sexy omg wow '

slang is neat insofar as access is concerned, but as one former CFO once said WHY TF U STILL USING SECDB?

Yeah a lot of it is Quant Infra, but there's also a lot of internal applications for dealing with different aspects of their consumer facing business. On top of this, there's also a lot tools that are not customer facing and are just to track different aspects of the business and every day operations.