F*** over old company?

[Cmlcml]

I was with my old company for 10 years and second in command for most of that time. While I was there, the company had huge success and grew a substantial amount which I played a big part in. My boss was my friend.
Things changed when I had my first child and wanted to return part time. I was stripped of all perks and treated like utter crap by her. She made remarks about how quickly she went back full time after having kids etc. She even spread a rumour around the office that I had PND. I wanted to take legal action but the stress of the job was sending me into depression and I just had to get out and get rid. I didn't even get a goodbye from my boss which hurt deeply after all that I'd done for the company.
I now freelance for myself and and am happy....but still bitter but I'm hoping that will fade in time.
Now my wwyd question is should I go to a direct competitor and offer them my services and give them insights to my old companies success and failings? Oh thinks I should but I'm not sure if it's just a bit to petty?

Would you be happy to do so?

I think i would.

But I'm not you, its more important to be happy than right.

What a cow though?!

I think you have no reason at all to be loyal but should be careful of the vulnerable position you could leave yourself in. Also you would be more professional if you focussed on advantages you could offer rather than criticising your ex employee directly. You will still be able to shine a light on their shortcomings.

No. It would be unprofessional.

I would be very wary of someone who did that. It would make me not want to work with you - even if I was the person you were telling the secrets to. I would worry that you would turn on me/my company.

It also opens yourself up to being used- probed for information then dropped once you aren’t useful in that way.

Sorry you were treated badly by your old company. Don’t tarnish a professional image though - it’s very important when freelancing.

Your loyalties lay with yourself, maybe if she had of treated you with more respect you could of done the same.

NO!

If you came to me, I would not think you were petty, I would think you were totally unprofessional and untrustworthy. "Offer your services"... wouldn't touch them with a bargepole.

I wouldn't go to the competitor saying "i am here to give you all the secrets", But It would be pretty implicit that you know the industry well.
Use it as a negotiating point to ask for a good salary . share of profits.
Go with the attitude that you will enjoy being respected / rewarded for your experience in the field.
Then if you happen to screw over your ex company as a consequence, then that's an added bonus, if you are that bothered by that point.
On a separate note; if you do think you may be prone to depression, I would go and see your GP. and discuss it before you change jobs. Your (mental) health is more important than work.

Most consultants do this

Thanks for all your feedback! The last thing I want to come across is unprofessional.
I need to have a think and maybe approach it in a different way.