Scalability Solution Architecture Upgrade

My platform holds up well under moderate traffic, yet the moment user numbers spike the experience degrades, especially during database searches and updates. I need an experienced solution architect—six years or more in similar optimisation work—to rethink the way we handle concurrent users and turn that thinking into a concrete, phased plan I can hand to my developers. Here is what I expect from your engagement: • A rapid assessment of the current architecture, highlighting the exact points where concurrency breaks down. • A detailed blueprint that shows how to remove those bottlenecks, improve database access patterns, and scale horizontally or vertically as appropriate. • A step-by-step implementation roadmap with milestones, risk notes, and rollback considerations so we can adopt improvements without downtime. Please include examples of past work where you solved comparable scalability challenges; that track record will guide my selection. No lengthy proposals are necessary—your results should speak for themselves.