Backend Interview CS Quiz Prep

DayLab

Contains adsIn-app purchases

About this app

For a backend developer technical interview, reviewing the right material at the right time matters more than solving as many questions as you can.

Prepare seven areas in one app: Data Structures, Algorithms, Operating Systems, Networks, Databases, Software Engineering, and Java & Spring. Each area has original practice questions with detailed explanations, and FSRS schedules your next review based on how well you remember each question.

The app, questions, and explanations are available in English, Japanese, Simplified Chinese, Portuguese (Brazil), Spanish, and Korean.

KEY FEATURES

Full coverage by subject
Study the seven areas by subject and unit. Progress and accuracy for each unit show what you have not touched yet and where you are weak.

Original questions with detailed explanations
Four-option practice questions on frequently covered topics. Explanations show why the answer is right and why each other option is not.

Starting diagnostic
A short diagnostic shows where you stand so you can choose a subject to start with.

Question search
Search concepts, questions, and options at once, even when the wording differs a little.

Choose what to practice
Pick a subject or unit, and turn on "Unanswered first" to continue from questions you have not tried.

Difficulty labels and filters
Each question is labeled Easy, Medium, or Hard. Filter the full question list by difficulty to strengthen your foundations or focus on challenging questions.

Resume where you left off
Leave the app any time and pick up from the question where you stopped.

FSRS smart review
Questions you know come back less often; questions you miss come back sooner, right when your memory starts to fade.

Study and review reminders
A daily reminder at the time you choose, plus a nudge when reviews pile up.

Weakness analysis
See accuracy by subject and unit, then jump straight into the unit that needs work.

Review box and wrong-answer notes
Collect wrong answers and questions to revisit, sort and filter them, and add notes on why they confused you.

Pass tracking
See how many times you have solved each question.

Topic frequency analysis (Premium)
See how much weight each unit carries and focus on the units that come up most.

Study report and stats
A daily report, questions solved per day, accuracy trends, and your study streak.

Eliminate options
Cross out options you have ruled out and focus on the rest.

Support and FAQ
Read the FAQ and send an inquiry with photos. You are notified when it is answered.

Comfortable reading
Adjustable text size, light and dark themes, and a tablet layout for larger screens.

Offline study
Solve questions without an internet connection.

Sync across devices
Sign in to keep your study history and review schedule when you switch devices.

WHO IT IS FOR

Developers preparing for backend technical interviews for the first time
Self-learners who plan their own preparation
Anyone who gave up on wrong-answer notes because they were tedious
People who study in short commutes and breaks

ABOUT THE CONTENT

All questions are original study content created from publicly known learning topics. They do not reproduce actual interview questions or hiring tests from any company.

This app is an independent study tool for backend interview preparation. It is not affiliated with and does not represent any company, recruiting organization, or educational institution. Check the official guidance of the company you apply to for its hiring process and criteria.

USING THE APP

The study features can be used for free. To remove ads and study without the daily allowance, you can choose a monthly, 3-month, or 1-year option. See the in-app purchase screen in the store for the actual payment terms.

TERMS

Terms of Service: https://dayprep.co/devbackend/terms
Privacy Policy: https://dayprep.co/devbackend/privacy

(c) 2026 DAYLAB, [e-mail]