Tech interview concepts, explained
Short, focused articles on the concepts behind tech interview questions — the traps interviewers actually probe, with worked examples. See all topics we cover.
- Page Object ModelEN
Page Object Model: Enhancing Test Maintenance and Clarity
Learn how the Page Object Model streamlines test automation, reducing code duplication and improving maintenance.
- Integration TestingEN
When to use Integration Testing (and when not to)
Learn the strategic moments for integration testing and common pitfalls that can lead to integration errors in production.
- Database TypesEN
Database types interview questions: common misconceptions and pitfalls
Mastering the nuances of database types can help you navigate tricky interview questions and avoid costly production mistakes.
- Meta TagsEN
When to use Meta Tags (and when not to)
Master meta tags to enhance SEO and improve site performance, while avoiding common pitfalls that can harm your website's visibility.
- Memoization PerformanceEN
Memoization Performance: When Overhead Outweighs Gain
Discover the nuanced trade-offs of using memoization and how to apply it effectively in real-world scenarios.
- Data CleaningEN
Data Cleaning test for job interviews: common mistakes to avoid
Master data cleaning techniques to excel in interviews and ensure accurate analysis on the job.
- Execution PlanEN
Execution Plan: Understanding the Cost for Optimal SQL Queries
Learn how to interpret SQL execution plans to optimize query performance and avoid common pitfalls in interviews and production.
- XLOOKUPEN
XLOOKUP interview practice: common mistakes and exercises
Master XLOOKUP with practical exercises to avoid common pitfalls in job interviews and real-world scenarios.
- Data IntegrityEN
Data Integrity — the subtle bugs from schema changes
Understanding data integrity can prevent costly bugs in production and help you excel in technical interviews.
- CachingEN
Caching — the stale data trap when user profiles change
Learn how caching dilemmas can lead to stale data and performance pitfalls in web applications and how to handle them effectively.
- Star SchemaEN
Star Schema test for job interviews: improving data redundancy
Master star schemas for effective data modeling and optimize query performance in interviews and real-world analytics.
- EncryptionEN
Encryption interview questions and common mistakes
Master encryption concepts and avoid common pitfalls to excel in interviews and secure systems in production.
- PandasEN
Pandas interview practice: avoiding common calculation traps
Master crucial Pandas functions for data analysis and prepare for practical interview tasks with real examples and common pitfalls.
- Quality AssuranceEN
When to use Quality Assurance (and when not to)
Mastering Quality Assurance can drastically improve your testing process and overall product quality, but misuse can lead to wasted time and resources.
- Mutation TestingEN
Mutation Testing interview questions: pitfalls for candidates
Explore common pitfalls in mutation testing that candidates face during interviews and in real-world applications.
- Error HandlingEN
Error handling test for job interviews: common pitfalls to avoid
Master error handling with practical examples and avoid common pitfalls in job interviews and on the job.
- CSRFEN
CSRF — the hidden risk in user sessions
Learn how CSRF attacks exploit user sessions and best practices to mitigate them effectively.
- Excel FormulasEN
Excel formulas test for job interviews: common pitfalls and best practices
Master Excel formulas with practical exercises to excel in interviews and everyday data analysis tasks.
- Context APIEN
Context API interview questions: common pitfalls in state management
Avoid pitfalls with the Context API in React by mastering its performance implications and best practices for state management.
- Software Development Life CycleEN
Software Development Life Cycle: the pitfalls of skipping stages
Understanding the Software Development Life Cycle helps avoid common missteps that can derail projects.
- TableauEN
Tableau exercises for data analyst interviews
Master key Tableau exercises to excel in data analyst interviews with practical examples and common pitfalls.
- XSSEN
XSS vulnerabilities — the sneaky injection that compromises users
Learn to identify and fix XSS vulnerabilities to safeguard web applications against attacks that could compromise user data.
- GROUP BY and HAVINGEN
GROUP BY and HAVING interview practice: the common pitfalls and tricky scenarios
Master SQL's GROUP BY and HAVING to ace interviews and analyze data effectively with real business examples.
- HTTP MethodsEN
HTTP Methods: Common Mistakes and Interview Questions
Understand common pitfalls with HTTP methods and excel in interviews by mastering their nuances within RESTful APIs.