I found the following users who may fit your language exchange criteria:

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/zendrahh	2020-08-16	Post	5	English	Polish
u/greystone717	2020-09-06	Post	5	English	Polish
u/selimnho	2020-07-14	Post	5	English	Polish
u/alocxacoc	2020-09-08	Post	5	English (Native)	Polish
u/meditationnation	2020-09-10	Post	5	English	Polish

Please feel free to comment on the above posts to get in contact with their authors.

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^{Hermes: a bot for r/Language_Exchange | Documentation}

I'm a programmer myself, I would love to start a language exchange experience with you, maybe you're open to speak with a non native English speaker, in any case I hope you succeed in your journey.

C# made me laugh so hard lol