要说 Coinbase OA ，真的是比一般互联网公司的更有意思一点。作为全球最大的加密货币交易平台之一，他们在招聘环节尤其看重候选人的逻辑和代码功底。OA 不只是单纯刷题，很多题目都带点交易业务的味道，比如订单撮合、价格分析或者交易异常检测。刚拿到题的时候，可能觉得跟常规 OA 差不多，但仔细做就会发现，细节上还是有不少坑。
Coinbase 的 OA 一般在 Codility 或 HackerRank 上測，時間大概 70 到 90 分鐘。 整體是 2 到 3 道程式設計題，有時還會摻雜一點 SQL 或者數據清洗的小題。 難度在中等偏上，主要考察三個方面：
- 代碼的正確性（能不能跑通所有 case）;
- 時間複雜度（別超時）;
- 可讀性（代碼是不是清晰）。
常見題型圍繞陣列、哈希表、區間處理、字串操作，但題目背景會結合金融場景，比如撮合引擎、價格波動、異常交易檢測之類的。 做題時感覺既像演算法題，又有點業務味道。
Coinbase OA 真題分享
Question 1
What does event.stopPropagation() do?
Select the correct answer:
- It stops the event from bubbling through the element’s descendants.
- It stops the default behavior of the element being clicked.
- It stops other event handlers on the element from firing.
- It stops the event from bubbling through the element’s ancestors.
- I don’t know
Question 2
In what order does f receive its arguments?
Language: Javascript
f("foo");
setTimeout(function() { f("bar"); }, 0);
f("baz"); Select the correct answer:
- foo baz bar
- foo bar baz
- foo baz
- bar foo baz
- I don’t know
Question 3
What does the following code do?
Language: Javascript
str.split("dog").join("cat") Select the correct answer:
- Replaces every occurrence of the word “dog” in a string with the word “cat”
- Finds the word “dog” in a string, and appends “cat” at that location
- Creates an iterator from “dog” to “cat” in the string
- Appends “dogcat” to the end of a string
- I don’t know
Question 4
Which of the following selectors will make Text pink?
Language: Html
Select the correct answer:
Replaces every occurrence of the word "dog" in a string with the word "cat"
Finds the word "dog" in a string, and appends "cat" at that location
Creates an iterator from "dog" to "cat" in the string
Appends "dogcat" to the end of a string
I don't know
Question 20
Which of the following selectors will make Text pink?
Language: Html
Select the correct answer:
div.elem { color: pink; }#id { color: pink; }.wrapper.elem { color: pink; }.wrapper:nth-child(1) { color: pink; }- I don’t know
Question 5
What technique would dramatically improve the performance of the following function?
Language: Plain
fun fib(n: Long): Long {
return if (n <= 1) n else fib(n - 1) + fib(n - 2)
} Select the correct answer:
- recursion
- bytecode compilation
- memoization
- divide-and-conquer algorithm
- I don’t know
Question 6
Consider the following Javascript code. The final output to the console is 0. Why?
Language: Javascript
function incr(num) {
this.count++;
}
incr.count = 0;
let i;
for (i=0; i<10; i++) {
if (i > 5) {
incr(i);
}
}
console.log(incr.count); Select the correct answer:
thisinincrdoesn’t have a reference toincr.count.- There’s a bug in the for-loop.
- This is caused by Javascript’s hoisting mechanism.
console.logis async and therefore doesn’t reflect the most up-to-date value.- I don’t know
Question 7
Which of the following is not an accurate statement regarding CAPTCHAs?
Select the correct answer:
- They have been criticized for exploiting unwitting labor
- They are used to distinguish users and bots
- Input solutions are manually verified
- A common implementation is based on the recognition of distorted text
- I don’t know
少走彎路，多拿 offer
Coinbase 的 OA 給我的感覺就是：不光看你能不能寫出代碼，還要看你能不能在緊張的時間里把思路理清，寫得既對又快。 如果你經常遇到“腦子裡有點思路但寫不完整”或者“卡在 debug 出不來”的情況，那真的沒必要死撐。
在 Programhelp，我們做的不只是“代寫”，而是幫你在考試中保持節奏感。 通過遠端無痕助攻，我們能及時提醒你哪些思路更高效、哪些坑要避免，甚至在關鍵 debug 節點拉你一把。 很多同學靠著這點輔助，不光順利過了 Coinbase 的 OA，還在 Robinhood、Stripe 這種金融科技公司拿到後續面試機會。
所以如果你正準備 Coinbase 的 OA，不妨找我們聊聊，少走點彎路，節省寶貴的備考時間，說不定下一個順利過關的就是你。
