Salesforce Coding Interview Questions
100 Salesforce coding interview problems with full optimal solutions — 30 easy, 50 medium, 20 hard. Every problem ships with multiple approaches (brute-force first, then the optimal), complexity tables for each, company-specific tips on what an Salesforce interviewer values, and a FAQ section.
Showing 12 problems of 100
- #1easyfrequently asked
1. Two Sum
Find two indices in an array whose values sum to a target. Salesforce uses this as a warmup to test whether you reach for a hash-map lookup immediately or default to a nested loop on every problem.
- #2easyfrequently asked
2. Valid Parentheses
Determine if a string of brackets is properly balanced. Salesforce uses this to verify you reach for a stack on nesting problems and can handle their SOQL-style query parsers.
- #3easyfrequently asked
3. Merge Two Sorted Lists
Merge two sorted linked lists into one sorted list. Salesforce uses this to test whether you handle pointer arithmetic cleanly and reach for a dummy-head sentinel to simplify edge cases.
- #8easyfrequently asked
8. Merge Sorted Array
Merge two sorted arrays in-place into the first array, which has trailing zeros for the second's contents. Salesforce uses this to test the reverse-merge trick essential for any in-place sorted data manipulation.
- #12easyfrequently asked
12. Maximum Depth of Binary Tree
Return the maximum depth (number of nodes along the longest root-to-leaf path) of a binary tree. Salesforce asks this to verify clean recursion — relevant to their role-hierarchy depth queries.
- #16easyfrequently asked
16. Best Time to Buy and Sell Stock
Find the maximum profit from a single buy-sell of a stock given daily prices. Salesforce uses this to test running-minimum tracking, the same pattern in their forecasting and quota-attainment dashboards.
- #18easyfrequently asked
18. Single Number
Find the element that appears only once when every other element appears twice. Salesforce uses this to test the XOR trick and the recognition that O(1) space is achievable.
- #19easyfrequently asked
19. Linked List Cycle
Detect whether a linked list contains a cycle. Salesforce asks this to test the Floyd's tortoise-and-hare algorithm — a foundational two-pointer trick used in their dependency-cycle detection for workflow rules.
- #20easyfrequently asked
20. Min Stack
Design a stack supporting push, pop, top, and retrieving the minimum element in O(1). Salesforce uses this to test data-structure design with an auxiliary-stack twist.
- #26easyfrequently asked
26. House Robber
Given an array of non-negative integers representing house values, find the max sum without robbing two adjacent houses. Salesforce uses this as the canonical 'introductory DP' problem to see if you can derive the recurrence.
- #29easyfrequently asked
29. Reverse Linked List
Reverse a singly linked list. Salesforce uses this as a fundamental pointer-manipulation check — they expect both the iterative and recursive solutions.
- #30easyfrequently asked
30. Contains Duplicate
Determine if any value appears at least twice in an array. Salesforce uses this to test reach-for-Set instincts and articulate the time-space trade-off.
Related interview-prep guides
HireVue Tech Interview Guide: The 2026 Playbook for Async Video Rounds
HireVue is the category-leading async video interview platform. Candidates record answers solo, on the clock, and a combined AI-plus-human review layer scores the recording days later. For 2026 tech jobseekers, the format is different enough from live interviews to need its own playbook. This guide is that playbook.
Codility for Tech Interviews in 2026: The Complete Guide for Candidates
Codility is the dominant algorithmic-assessment platform across European tech hiring. Heavy in the UK, Germany, Netherlands, Nordics, and Poland where the company was founded. It scores candidates on both correctness and time complexity, runs 60-to-120-minute timed tests, and ships three products: Tests, CodeCheck, and CodeLive. This guide is what 2026 candidates need to know.
Spark Hire Async Video Interview Guide for Tech Jobseekers (2026)
Spark Hire is a mid-market async video interview platform used by 6,000+ employers across tech, healthcare, retail, and education. Candidates record video answers to pre-recorded prompts within configurable time budgets, and hiring teams review the recordings asynchronously. Lighter on AI scoring than HireVue, heavier on human review.