Coding Questions 2025 - Interview Problems with Solutions

Coding Questions - Consulting Tech

Practice coding interview questions for consulting technology roles.

Consulting Focus

Consulting firms value: Problem-solving approach, Communication skills, Business acumen, Technical fundamentals.

Basic Programming

1. Reverse String

def reverse_string(s):
    return s[::-1]

2. Two Sum

def two_sum(nums, target):
    seen = {}
    for i, num in enumerate(nums):
        if target - num in seen:
            return [seen[target - num], i]
        seen[num] = i
    return []

3. Valid Parentheses

def is_valid(s):
    stack = []
    mapping = {')': '(', '}': '{', ']': '['}
    for char in s:
        if char in mapping:
            top = stack.pop() if stack else '#'
            if mapping[char] != top:
                return False
        else:
            stack.append(char)
    return not stack

4. Palindrome Check

def is_palindrome(s):
    s = ''.join(c.lower() for c in s if c.isalnum())
    return s == s[::-1]

5. Fibonacci

def fibonacci(n):
    a, b = 0, 1
    result = []
    for _ in range(n):
        result.append(a)
        a, b = b, a + b
    return result

6. Find Second Largest

def second_largest(arr):
    first = second = float('-inf')
    for num in arr:
        if num > first:
            second = first
            first = num
        elif num > second and num != first:
            second = num
    return second

SQL Questions

7. Find Employees by Department

SELECT e.name, d.department_name
FROM employees e
JOIN departments d ON e.dept_id = d.id
WHERE d.department_name = 'Engineering';

8. Find Top Salaries

SELECT name, salary
FROM employees
ORDER BY salary DESC
LIMIT 5;

Related Resources

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Last updated: January 2026