Archqo

System design interviews are the hardest part of senior engineering loops, and there's almost no way to practice them properly. You can read blog posts and watch YouTube all day, but it's passive — you never get the experience of someone actually pushing back on your design decisions in real time. I built Archqo to simulate exactly that. You join a session, talk through your architecture using voice, and sketch on a whiteboard while an AI interviewer asks follow-ups, challenges your trade-offs, and probes weak spots in your design. WebRTC handles the voice so it feels like a real conversation, not a chatbot. Still early and actively iterating, but engineers have been using it to prep for interviews at companies like Google, Meta, and Amazon. The feedback loop of designing, getting challenged, and redesigning — that's what was missing from every other prep tool.