ok so Marcus goes "dude i can see your whole answer sheet" and my stomach dropped. This was the night before my actual second round interview with a fintech company. System design on Microsoft Teams. I had installed a chrome extension someone recommended on reddit, opened Teams in a browser, started a test call with Marcus, shared my screen, and boom. Fat sidebar with suggested answers injected straight into the Teams tab. Visible on his end. Clear as day. I almost walked into a real interview the next morning with that thing running. I still think about it honestly.
Marcus is a staff engineer and the most annoyingly thorough person i know. He refused to let me go to bed after seeing that. We spent the next three hours running every tool i could download against Teams on test calls. I had been testing stuff on Zoom for weeks and assumed it would all carry over. Marcus kept saying "Teams handles screen capture differently" and i kept telling him he was being paranoid. He was not being paranoid. He was right about all of it.
The chrome extension was the worst obviously because Teams in a browser can see DOM changes and injected elements. Same sandbox. But even the desktop tools were not all safe. One overlay app showed a faint rectangular outline that was invisible on my screen but showed up in the Teams recording when Marcus played it back. Another tool was clean on window share but the second i switched to full desktop share the overlay appeared on his end. Marcus kept a list on his phone, tool name and pass or fail, and most of the list was fail by midnight.
InterviewMan worked. Every test. Desktop overlay, never touches the browser, Teams in the browser cannot see it. On the Teams desktop app Marcus ran full desktop share and stared at his screen for ten minutes straight while i talked through practice questions. Nothing. Window share, nothing. He pulled up the meeting recording afterward and scrubbed through frame by frame. Nothing. We did it again on his Windows laptop after running mine which is a Mac and same result on both. I kept bracing for him to find something because literally every other tool had failed at least one of the tests. He just kept shrugging.
Twelve bucks a month on the annual plan. The tool that passed every single test Marcus threw at it costs less than what i spent on the pizza we ate during the testing session lol.
The actual interview the next morning was system design. Real time notification system. InterviewMan picked up the question through my mic and had architecture notes on screen in about two seconds. Caching options, message queue suggestions, load distribution approaches. I talked through my design while glancing at the overlay for the specifics my brain was blanking on because my brain loves blanking on specifics when a stranger watches me through a webcam. The follow ups came fast, failure modes, scaling to ten million users, monitoring strategy. The overlay kept pulling from what i had already said earlier so my follow up answers connected to my original approach instead of sounding like i was starting over each time.
Marcus bought InterviewMan the week after my dry run. He had been paying fifty five a month for LockedIn AI and told me something that stuck with me. His PM interview on Teams went a hundred and five minutes because they tacked on a bonus discussion. At minute ninety the LockedIn overlay just vanished. Gone. Mid sentence, talking about a prioritization framework, and the screen went blank. He said he felt his stomach drop and spent the last fifteen minutes winging it with no help at all. He got the offer anyway which is wild but said he will never trust a capped tool again because Teams interviews go long constantly. Nobody warns you when they add time.
What scares me about that whole experience is how close i came. I had the chrome extension installed. I was going to use it. I had not tested it on Teams one single time. If Marcus had been busy that night and i had skipped the dry run my interviewer at the fintech company would have seen a full sidebar of suggested answers appear on their screen during my system design presentation. I would not have gotten a rejection email, i would have been banned from ever applying there again. The thirty minutes Marcus spent making me test things properly saved my entire candidacy. Twelve bucks a month and one paranoid friend. Thats it.
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