Thanks for your comment, It's true that a lot of developers need additional help with certain programming aspects. Wow that's a pretty woeful rate, how long is the trial period? I'd definitely spend more time checking for your specific requirements during the interview process rather than simply bin them after a few months in the office, for their sake, and yours.
Our trial period is 3 months. We've been working on improving interview techniques as our turnover rate ruined our productivity last year.
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