Coding and Technical Interview Prep
Algorithm walkthroughs with tested code, LeetCode study plans, system design, and question sets for specific languages, clouds, and data tools.
34 articles
Blind 75: A Pattern-Based Study Plan for Coding Interviews
A pattern-by-pattern study plan for the Blind 75 LeetCode list, with a six-week schedule, a method for practicing each problem, and what the list leaves out.
Big O Cheat Sheet for Coding Interviews: Data Structures, Sorting, and Patterns
A Big O cheat sheet for coding interviews with growth rates, data structure and sorting complexities, common code patterns, Python costs, and how to calculate them.
AI LeetCode Tutor: How to Practice With Hints Without Losing the Skill
How to use an AI tutor for LeetCode practice: a hint ladder, a weekly routine, prompts to paste, and warning signs that you are relying on it too much.
AI LeetCode Tutor: Learn the Pattern, Not Just the Answer
Use an AI LeetCode tutor to understand constraints, choose a pattern, test edge cases, and explain your solution without copying code blindly.
CoderPad Sandbox: How to Practice Before Your CoderPad Interview
How to use the free CoderPad sandbox to get comfortable with the editor before a coding interview, what it can do, and a practice routine that matches the real interview.
System Design Interview Questions: 20 Problems and a Clear Framework
Practice system design interview questions with a repeatable framework for requirements, estimates, APIs, data, scaling, reliability, and tradeoffs.
LeetCode 224 Basic Calculator: Stack Solution in Python With a Trace
LeetCode 224 Basic Calculator with a tested one-pass stack solution in Python, a worked trace, unary minus handling, complexity, and follow-up problems.
Bellman Ford Algorithm: Coding Interview Guide
Learn the Bellman Ford algorithm, trace edge relaxation, detect negative cycles, explain complexity, and write interview-ready pseudocode.
FloydâWarshall Algorithm: Coding Interview Guide
Learn the FloydâWarshall algorithm, derive its recurrence, trace the matrix, detect negative cycles, reconstruct paths, and explain complexity.
Kosaraju's Algorithm: Strongly Connected Components Guide
How Kosaraju's algorithm finds strongly connected components in two DFS passes, with a worked example, tested Python code, complexity, and common mistakes.
Longest Common Substring: Dynamic Programming Solution in Python
Longest common substring with a tested Python dynamic programming solution, the difference from subsequence, space optimization, faster options, and edge cases.
Maximize the Total Height of Unique Towers: Greedy Solution in Python
Maximize the Total Height of Unique Towers (LeetCode 3301): sort descending and assign min(max, previous minus 1), with a tested Python solution and a proof sketch.
Merge K Sorted Lists: Heap and Divide-and-Conquer Solutions in Python
Merge K Sorted Lists (LeetCode 23) with tested Python code for the min-heap and divide-and-conquer solutions, complexity, edge cases, and how to explain it.
Python Interview Questions: 24 Questions With Practical Answers
Practice Python interview questions covering data models, functions, iterators, concurrency, testing, performance, and clear coding-interview reasoning.
Node.js Interview Questions and Answers: Event Loop, Async, APIs, and Scaling
Node.js interview questions with answers and code on the event loop, async patterns, Express, streams, memory leaks, security, and scaling.
Angular Interview Questions and Answers: 25 Questions From Basics to Signals
Angular interview questions with answers on components, dependency injection, change detection, signals, RxJS, forms, routing, performance, and testing.
25 Spring Boot Interview Questions and Answers (Spring Boot 3)
Twenty-five Spring Boot interview questions with clear answers and code: auto-configuration, dependency injection, REST APIs, JPA, transactions, testing, security, and Spring Boot 3 changes.
AWS Interview Questions and Answers: 25 Questions on Services, Security, and Design
AWS interview questions with answers on EC2, S3, VPC, IAM, databases, high availability, cost control, and scenario design questions.
Kubernetes Interview Questions and Answers: 26 Questions With Commands
Kubernetes interview questions with answers on pods, deployments, services, probes, scaling, storage, RBAC, and troubleshooting CrashLoopBackOff and Pending pods.
Terraform Interview Questions and Answers: 25 Questions on State, Modules, and Safe Changes
Terraform interview questions with answers on state, backends, locking, modules, environments, drift, imports, lifecycle rules, and safe change workflows.
Kafka Interview Questions and Answers: 22 Questions on Partitions, Consumers, and Delivery
Kafka interview questions with answers on partitions, ordering, consumer groups, delivery semantics, replication, lag, and a pipeline design scenario.
Databricks Interview Questions and Answers: 25 Questions on Spark, Delta Lake, and Pipelines
Databricks interview questions with answers on Spark shuffles and skew, Delta Lake, MERGE, OPTIMIZE, Unity Catalog, medallion design, and slow-job scenarios.
Snowflake Interview Questions and Answers
This guide prepares you for snowflake interview questions with a practical framework, realistic examples, a comparison table, follow-up prompts, and an evidence-based practice plan.
Talend Interview Questions and Answers: ETL, tMap, Context, and Debugging
Talend interview questions with clear answers on jobs, tMap, context variables, error handling, performance tuning, and deployment, plus a practice scenario.
Power BI Interview Questions: 25 Questions and Answer Guide
Prepare Power BI interview questions on data modeling, DAX, Power Query, security, performance, deployment, and stakeholder communication.
Selenium Interview Questions and Answers: 24 Questions on Waits, Locators, and Frameworks
Selenium interview questions with answers on locators, waits, flaky tests, page objects, framework design, parallel runs, and CI failures.
Cybersecurity Analyst Interview: 25 Questions and Answers
Prepare for a cybersecurity analyst job interview with questions on triage, logs, incidents, risk, communication, and practical answer frameworks.
Electrical Engineer Interview Questions and Answers: 24 Questions on Circuits, Power, and Design
Electrical engineer interview questions with answers on circuits, op-amps, filters, power factor, three-phase, interfaces, debugging, and safety.
Embedded Systems Interview Prep: Questions, Answers, Study Plan, and Books
Embedded systems interview questions with answers on volatile, ISRs, mutexes, priority inversion, buses, and watchdogs, plus a six-week plan and books to use.
Word Break (LeetCode 139): Dynamic Programming Solutions in Python
Word Break (LeetCode 139) with tested Python code for memoization and bottom-up dynamic programming, the max word length trick, edge cases, and how to explain it.
Valid Sudoku (LeetCode 36): Python Solution, Box Index, and Edge Cases
Valid Sudoku (LeetCode 36) with a tested one-pass Python solution, the box index formula, a bitmask variant, edge cases, and how to explain it in an interview.
Clone Graph (LeetCode 133): DFS with a Hash Map in Python
Clone Graph (LeetCode 133) with a tested Python solution using a hash map and depth-first search, why cycles need a map, common mistakes, and how to explain it.
Word Ladder (LeetCode 127): BFS with Wildcard Patterns in Python
Word Ladder (LeetCode 127) with a tested Python BFS solution using wildcard patterns, why BFS finds the shortest chain, complexity, bidirectional search, and edge cases.
CodeSignal Assessment Guide (2026): Format, Scoring, Rules, and How to Prepare
What the CodeSignal General Coding Assessment looks like in 2026: four tasks in 70 minutes, the 200 to 600 score, what you may use, retakes, and a plan for the time.