Please do not bother with this low life Belarusian CfB scammer. He is a law enforcement matter rather than a community member or a professional you should cooperate with. Of course he won't be your contact in Linkedin. He is a scammer. Besides that, his only professional credential that he was one of the main figure of the NXT and JINN scams. He never ever worked any software company that could be listed on Linkedin. Why a software developer like yourself with a reputable CV and extensive experience in software engineers would engage with a low life scammer? Please ignore him. Many of us respect you here. You can gain nothing from the association with this scammer.

On the professional note, as you are a software engineer, please download his Java files (12 files, that's all IOTA is which was sold to the idiots) and conduct a code review on it. Someone sent me the first version of IOTA and I had the bad fortune to see the coding of this wanker. Once you downloaded you will see a poor quality code. Lack of error handling, lack of exception handling, lack of comments, poorly implemented object oriented design - all which indicate this guy has never worked in professional environment for a serious company. What would you do if such shambolic work would be submitted by a junior programmer? You would tell the junior software engineer: please correct these basic violations of software engineering principles, and then the code review will be continued. Since he could scam money from the idiots, he doesn't have to learn designing proper software, right? So this low life scammer is not in your league. I suggest treat him accordingly.