Have you ever experienced this?

You've practiced a ton of algorithms, built decent projects, but the moment the interview starts, everything goes blank. The questions aren't even that hard, yet your brain freezes. You fumble through the code, lose track of your logic, and your ability to articulate just disappears. Especially with companies like Amazon, the interview feels like a high-stakes simulation, testing not only your technical ability but also your composure under pressure.

Today, let me share a real story. Our client, L, had just finished his Master's in Computer Science at a top university in China. He applied for an SDE role at Amazon. After passing the OA and initial screening, he was finally invited to a full technical interview. But just before it, he confessed: "I'm scared I’ll freeze, lose my logic, and forget everything under pressure."

That's when he reached out to us at CSOAHELP and signed up for our real-time remote interview support service.

The Amazon interviewer posed the following question:

Imagine you're interacting with Alexa. When you command Alexa to "acquire a certain item", it begins to retrieve information from a variety of sources, which we’ll refer to as ‘catalogues’. Each catalogue responds with a sorted list of potential matches. Your task is to write a program that can consolidate these sorted lists into one coherent list.

Sounds like a standard "merge K sorted lists" problem, right? Most candidates immediately think, "I’ve done this—just use a min heap." But in the actual interview, under pressure, with time constraints and the need to clearly communicate your thinking, it's easy to mess up.

Thanks to our assistance, L handled the interview smoothly from start to finish.

Before the interview, we spent 20 minutes running mock questions with L. We helped him anticipate possible questions, structure his response, and prepare his phrasing. During the actual interview, he connected with the Amazon interviewer from his main device. On a second device, we silently observed and delivered short, clear text prompts—outlines, key terms, and when needed, full code snippets.

Once the interviewer explained the question, L paused. We instantly sent a prompt: "This is a classic merge K sorted lists problem. Suggest using a min heap. Start by saying: 'I’ll use a min heap to manage the current smallest elements across all catalogues.'"

L followed our prompt and calmly said, "I plan to use a priority queue to maintain the smallest element among all current catalogue entries. Each time I pop the smallest value and push the next item from the same catalogue."

We followed up with, "For heap elements, include value, source list index, and the element’s index within that list—this way, you can trace where each value comes from."

L added smoothly, "I’ll store three values in each heap node: the product name, the index of the catalogue it came from, and its position in that catalogue."

The interviewer asked, "How do you ensure the final output is sorted?" We immediately prompted: "Explain that the heap always gives the current global minimum, so the result is guaranteed to be sorted."

L responded confidently, "Because the heap always pops the smallest current item among all catalogues, the resulting list will remain sorted."

When it was time to code, we displayed a clean, complete code structure on his second screen, which he could reference and transcribe with ease:

L referred to the code structure, typed confidently, and explained as he went. The interviewer was clearly impressed by his clarity, consistency, and naming style.

But the interview didn’t stop there. The Amazon interviewer followed up: "What if the catalogue data isn’t a list but a real-time data stream?" We instantly sent a new suggestion: "You can use iterators instead of full lists—just pull the next value when needed. The heap logic stays the same but becomes lazy-loaded."

L responded: "I’d convert each catalogue to an iterator and fetch data only when needed. This avoids high memory usage and works well for streaming data."

The interviewer pushed further: "What if the number of catalogues is extremely large—more than memory can handle?" We prompted: "Discuss memory control—only maintain the active heap. Introduce pagination to load catalogues in batches."

L continued: "I’d implement paginated merging, processing a subset of catalogues at a time, and store intermediate results in temp files or buffers to avoid memory overflow."

Another twist came: "What if each catalogue returns a complex object with fields like name, price, and rating? How do you sort those?" We sent a quick note: "Mention custom comparison—first by price, then rating."

L said: "I’d define a comparison function, sorting primarily by price, and use rating as a tiebreaker if prices are equal."

The interviewer nodded, saying, "That’s an engineering-practical approach."

A few days later, L received a second-round invitation. He used our support service in all remaining rounds and eventually landed the offer. He told us, "Honestly, I wouldn’t have performed this well without your help. It felt like someone was always guiding my thoughts behind the scenes."

Many people think solving interview problems is just about brushing up on Leetcode. But interviews aren’t exams—they’re real-time stress tests of communication, logic, and clarity. At CSOAHELP, we help you stay calm and focused, think clearly, and communicate professionally under pressure.

We don’t answer for you. But we make sure that before you get stuck, you see the best next step. When your mind blanks, we get you back on track. When you’re out of words, we help you say the right things.

This service is perfect for those who get nervous, struggle with structuring answers, aren’t confident with English, or simply want to make the most of a key interview. Whether you’re a student, a career switcher, or new to the tech world—if you want to show up strong, we’ve got your back.

One interview could change your life. Don’t let nerves or blank-outs cost you that chance. Use your "invisible advantage"—and let professionals help you win.

Want to know more? Contact us for mock interviews, question bank predictions, and real-time remote support.

Smart candidates don’t go it alone. They know when to get help.

经过csoahelp的面试辅助，候选人获取了良好的面试表现。如果您需要面试辅助或面试代面服务，帮助您进入梦想中的大厂，请随时联系我。

If you need more interview support or interview proxy practice, feel free to contact us. We offer comprehensive interview support services to help you successfully land a job at your dream company.