Interview Questions: 10 Most Common, Hardest, and Red Flags

You’ve polished your résumé, rehearsed your elevator pitch, and chosen a crisp outfit. Then comes the part that makes most people sweat: the interview itself. Those nerves can be turned into confidence by knowing exactly what questions to expect and what to ask in return.

Most common interview questions: 10 ·
Hardest interview questions: 5 ·
Interview red flags: 29

Five key facts that every job seeker should keep in mind:

What are the 10 main interview questions?

Research from career sites and HR departments consistently points to a core set of questions that appear in nearly every interview. The University of Wisconsin Human Resources emphasises that questions should be directly related to job requirements and the candidate’s potential contributions. Here are the ten most common, along with sample answer strategies.

What are the 5 main interview questions?

• Tell me about yourself. Keep it professional: your current role, a key achievement, and why you’re interested in this opportunity.
• Why do you want this job? Connect your skills and goals to the company’s mission and the specific role. (Colorado State University Human Resources)
• What are your greatest strengths? Pick one or two strengths that are directly relevant to the job, and back them with a brief example.
• What is your greatest weakness? Choose a real weakness that you’re actively working to improve, and describe the steps you’re taking.
• Where do you see yourself in five years? Show ambition aligned with the company’s growth path.

The pattern: every question is an opportunity to link your experience to the employer’s needs. Hiring managers value candidates who can articulate that connection clearly.

What are the top 3 interview questions?

• Tell me about yourself. Often the icebreaker; your answer sets the tone.
• Why do you want this job? Tests your research and genuine interest.
• Why should we hire you? Your closing argument—make it count.

These three questions appear so frequently because they quickly reveal a candidate’s preparation and self-awareness. According to Toggl Track career blog, not knowing basic details about the job is a major red flag for interviewers.

What are the 7 most common interview questions and answers?

• Tell me about yourself. → “I’m a marketing specialist with five years of experience driving B2B campaigns. In my current role I increased lead generation by 40%.”
• Why do you want this job? → “I admire your company’s commitment to sustainability, and my background in green logistics aligns perfectly with the role.”
• What are your strengths? → “I’m highly organised and data-driven. I once reduced reporting time by 30% by automating dashboards.”
• What is your greatest weakness? → “I tend to be overly critical of my own work. I’ve learned to balance that by setting clear deadlines and asking for peer feedback.”
• Tell me about a time you faced a challenge. → Use the STAR method (Situation, Task, Action, Result). (Pin behavioral guide)
• Where do you see yourself in five years? → “I’d like to grow into a team leadership role while continuing to develop expertise in data analytics.”
• Why should we hire you? → “Because I bring a proven track record in precisely the outcomes you’re looking for, and I’m excited to contribute from day one.”

What are the 5 hardest interview questions?

Some questions are designed to push candidates off balance. The exact list varies by industry, but five consistently top the “hardest” lists. Why they are tough and how to handle them.

What are the 5 hardest interview questions and answers?

• What is your greatest weakness? Hard because it requires vulnerability without damaging your candidacy. Strategy: be honest, but show you’re working on it.
• Tell me about a time you failed. Similar to the weakness question—focus on what you learned and how you bounced back.
• Why do you want to leave your current job? Avoid negativity. Frame it as a pursuit of growth or a better fit.
• How do you handle stress or pressure? Use a concrete example of a high-pressure situation and the steps you took to manage it.
• What would your previous boss say is your biggest area for improvement? A variation on the weakness question, but it tests your self-awareness about external perceptions.

According to Physician Leaders article, dishonesty is one of the strongest red flags hiring managers watch for. So never fabricate a failure story—use a real but manageable example.

What this means: candidates who prepare honest, structured answers to the hardest questions stand out from the majority who stumble on them.

What are the top 10 questions to ask in an interview?

Asking thoughtful questions is just as important as answering them. It shows you’ve done your homework and are serious about the role. Here are ten questions that can help you decide if the company is the right fit.

What are good questions to ask an interviewer?

• What does success look like in this role in the first 90 days?
• What are the biggest challenges the team is currently facing?
• How does the company measure performance and provide feedback?
• Can you describe the company culture?
• What opportunities for professional development exist?
• Who does this role work with most closely?
• What is the typical career path for someone in this position?
• How does the company support work-life balance?
• What are the next steps in the interview process?
• Is there anything about my background that gives you pause? (This last one is bold but can reveal objections early.)

The Pin behavioral guide notes that behavioural interview answers are often evaluated using the STAR framework. If any element is missing, interviewers should probe for it. The same principle applies to your questions: ask for specific examples, not generic promises.

What are red flags during a job interview?

Red flags can come from both sides of the table. Recognising them early can save candidates from bad jobs and interviewers from bad hires. Here are the most common red flags, backed by research.

29 Interview Red Flags

We’ve compiled 29 red flags from multiple sources. They fall into three categories: candidate behaviour, interviewer behaviour, and process issues.

• Candidate red flags: showing up late (Toggl Track career blog), giving strange excuses, not knowing basic details about the job, dishonesty (Physician Leaders article), rude language or behaviour, criticising past employers (Recruitee hiring blog), vague or evasive answers (Taalent red flag guide), contradicting earlier statements or the resume, poor behaviour toward staff, blaming others for past failures (Pin behavioral guide), hypothetical answers instead of real examples, vague results, and lack of preparation.
• Interviewer red flags: asking about arrest record, military status, pregnancy, sexual orientation, disabilities, age, race, gender, national origin, citizenship, religion, or marital status (University of Wisconsin Human Resources). Also, asking about the existence of a disability before an offer is made (Colorado State University Human Resources).
• Process red flags: rushed interviews, unexplained delays, pressure to accept immediately, and lack of transparency about role or team.

What are red flags for candidates? Candidates should watch for interviewers who dominate the conversation, avoid answering questions about culture, or focus on negative aspects of the company. According to Recruitee hiring blog, poor behaviour toward interviewers or staff can indicate future team and client relation problems.

What are red flags for interviewers? Interviewers should be alert for candidates who speak negatively about former employers, give vague answers, or cannot explain their resume gaps. The Taalent red flag guide highlights that a vague understanding of the job applied for is a red flag.

What is the killer question in an interview?

The “killer question” is the one that can make or break an interview. It’s often a simple, open-ended query that reveals how a candidate thinks. Examples include “Why should we hire you?” and “What would you do in your first month?”

7 killer interview questions to prepare for

• Why should we hire you? Your closing pitch. It should summarise your unique value proposition.
• What would you do in your first 30 days? Tests your ability to plan and prioritise.
• Tell me about a time you disagreed with your manager. Reveals diplomacy and conflict resolution skills.
• How do you prioritise when you have multiple deadlines? Shows your organisational skills.
• What motivates you? A quick check on cultural fit.
• Describe a time you had to learn something new quickly. Tests adaptability.
• What do you think about our biggest competitor? Beware: this can be a trap if you sound negative or uninformed.

According to Pin behavioral guide, if any STAR element is missing, interviewers should probe for it. That applies to your answers to killer questions as well—always provide a concrete example.

How to Prepare for Interview Questions: A Step-by-Step Approach

1. Research the company and role. Know the company’s mission, recent news, and the job description inside out. Colorado State University Human Resources recommends using standardised questions for all candidates to promote fairness—so you can expect consistent questions.
2. Prepare your STAR stories. Identify three to five key achievements that match the job requirements. For each, write down the Situation, Task, Action, and Result.
3. Practise answering common questions. Use the list from the previous section. Record yourself to check for vague language or filler words.
4. Prepare your own questions. Write down at least five questions from the list above. Prioritise them based on what matters most to you.
5. Plan for the killer question. Have a concise, confident answer ready for “Why should we hire you?”
6. Know what not to ask. Avoid questions about salary, benefits, or vacation in the first interview unless the interviewer brings them up. The University of Wisconsin Human Resources advises that questions about arrest record, military status, pregnancy, and other protected characteristics are discriminatory and should not be asked.
7. Review your resume and portfolio. Be ready to discuss every item. The Taalent red flag guide notes that contradicting earlier statements or the resume is a major red flag.
8. Plan your logistics. Confirm the time, location, and technology. Arrive 10 minutes early.
9. Dress appropriately. When in doubt, err on the side of formality.
10. Follow up. Send a thank-you email within 24 hours, referencing something specific from the conversation.

“The most common interview question is ‘Why do you want this job?’ — and the best answers connect the candidate’s skills to the company’s goals.”

Toggl Track career blog

“The Muse lists over 60 common interview questions, including salary and job satisfaction questions. The key is to prepare a few stories that demonstrate your fit.”

The Muse career advice platform

“Hays Ireland categorises interview questions into three types: behavioural, competency, and situational. Each requires a different preparation strategy.”

Hays Ireland recruitment agency

Interviews are a two-way street. The best outcome is a mutual fit, not a one-sided win. For candidates in the UK and Ireland, where employment law protects against discriminatory questions, knowing your rights is as important as knowing your strengths. Preparation, honesty, and self-awareness are the only tools you need.

The pattern across all five clusters: every question type rewards preparation, and every red flag penalises its absence.

Frequently asked questions