Quantitative traders are financial market traders who implement and execute quantitative strategies. They generally do very little research and development themselves. Think less "candlestick charts" and more "Markov chains and stochastic processes."
Traders monitor the markets, execute trades based on strategies developed by the entire team (including quants and developers), and act as "puppeteers" to the models.
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Traders form new trading ideas and strategies through weekly meetings with operations managers. Traders propose ideas, which quantitative analysts and researchers then investigate.
These proposals pertain to model development progress, problems running current models, updating old models, back-testing models, model parameter tuning, and more.