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A strict non-compete locking you into the company is likely non enforceable but certain provisions dealing with geographic region and duration of future employer that are reasonable would be enforceable. Generally, New Jersey courts will only enforce restrictive covenants if they are reasonable in scope and duration (Community Hosp. Group, Inc. v. More, 869 A.2d 884, 897 (N.J. 2005)).
If you are seriously considering going back to work for your other company, would consult a local NJ attorney into whether doing so could be considered a breach of the non-compete agreement. Here is a link to a NJ firm that allows for free consultations to discuss the non-compete agreement: https://www.njplaintiff.com/
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