Programhelp team has been focusing on tech job search coaching for many years, and we have helped countless students realize their career transformation. Student L used to be an accountant who suffered from overtime work and low salary, but because she aspired to the ideal work-life balance in the tech industry, she decided to go through Bootcamp to change her code. Under our full coaching, she breaks through all the difficulties all the way and finally succeeds in getting Stripe Offer.
First round of Coding
Up is the hard stuff. This question is very similar to the LeetCode minimum number of transactions question, but don't get sidetracked -- Stripe doesn't require you to come up with an optimal solution, just to balance the account balance to the target value. To be clear, it's just a way for you to build a basic solution that works, so don't go all complexity on it.
The interviewer's Follow up is where the real skill is tested. The first question, asked how to realize the minimum number of transactions, this time you can LeetCode original problem solving ideas moved out on the line, greedy algorithm, mathematical derivation, the said are clear. The second question chat audit program, directly give a "first simulation run (dry run), and then compared with the database results" program. This trick is practical, can quickly verify the logic of the transaction is not right, the interviewer is the most important point.
Round 2 HM chat
This round is about meeting the Hiring Manager face to face. But don't make small talk, they are looking at you with a magnifying glass. There are three things at the core: how well you match the team, how reliable your career plan is, and how well you understand your position and the company's business.
In preparation, go through your past experience and organize your projects and skills related to the position into a clear story line. During the conversation, focus on how these skills can be useful in Stripe's business scenarios. Then study Stripe's business model and corporate culture in advance, and naturally integrate these understandings into the conversation, so that the interviewer will feel that you really want to join the company, rather than just casting your vote and taking your chances.
Round 3 API Integration
The task looks simple, but the details are hidden. The interviewer directly threw you a link to the code repository, let you clone it, call the specified API, and finally store the returned response data. Don't underestimate these steps -- if you are not skilled in Git operation, you won't even be able to pull down the repository; if you make a mistake in the parameters of the API call, you won't be able to get the data; and if the storage logic is poorly written, you'll have to use it in the future.
It is recommended to quickly go through the README of the repository first to get a clear picture of the project structure and dependencies. When calling the API, double check the details of the request header and parameters. Don't just throw in all the data, but design a good storage structure according to the data format and subsequent usage scenarios. As long as the code logic is clear, do not make low-level grammatical errors, this pass is basically stable.
Round 4 debug
The Debug session based on the Mako framework is a prickly job. There are two big potholes waiting for you. The first pit is that the program doesn't check if the file path is a directory or not, it directly uses the path as a directory, and will definitely report an error when it encounters a file. The solution is simple, add a path type judgment, if it is a directory, then go down.
The second pit is even more insidious, missing the function that handles a specific Abstract Syntax Tree (AST) node, which is the node that Mako gets stuck on when parsing templates. This time you have to familiarize yourself with the AST structure, fill in the corresponding access functions, so that the program can be parsed properly. debug process, more use of print logs, breakpoints debugging these means to quickly locate the problem.
Round 5 SD: Ledger service
In this round of system design, Stripe plays with differentiation. Other companies may focus on the macro-architecture, but Stripe focuses on the details of API design. Don't be in a hurry to draw architecture diagrams, first talk to the interviewer about the core functions of the service, performance requirements, and usage scenarios. For example, is this Ledger service for internal use or for external use? What is the throughput? How to ensure data consistency?
After talking clearly about the requirements, targeted design of the service layer and database. API design should not be vague, parameter types, return value format, error code definition, these details must be there. Don't just say what database to use for database design, how to design table structure, how to build indexes, you have to make it clear. Remember, the whole process and the interviewer to maintain communication, while designing and confirming the direction, do not be bored with the end of the mess only to find that it has gone astray.
Stripe more interview questions are organized and can be reference
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