The 2026 FAANG Interview Prep Roadmap: 12-Week Study Plan That Actually Works

The 12-Week FAANG Interview Prep Plan

Most engineers spend 3–6 months preparing for FAANG interviews — but most of that time is wasted on unfocused LeetCode grinding. This roadmap, based on data from thousands of successful FAANG hires, gives you a structured 12-week plan that prioritises the topics and skills that actually appear in interviews.

Before You Start: Assess Your Level

Take 15 minutes to honestly evaluate where you are:

SkillBeginnerIntermediateAdvanced Data StructuresStruggle with arrays, linked listsComfortable with trees, graphs, heapsCan implement any DS from scratch AlgorithmsKnow sorting, basic searchComfortable with BFS/DFS, DP basicsCan solve LeetCode Hard consistently System DesignNever studied itKnow basic concepts (load balancers, caches)Have designed production systems BehaviouralNo stories preparedHave a few examples readyCan deliver STAR answers fluently If you're a beginner, add 4 weeks to this plan (16 weeks total). If you're advanced, you can compress to 8 weeks.

Phase 1: Foundations (Weeks 1–3)

Week 1: Core Data Structures

Daily target: 3 problems (1.5 hours) DayTopicKey Problems MonArrays & HashingTwo Sum, Contains Duplicate, Group Anagrams TueTwo PointersValid Palindrome, 3Sum, Container With Most Water WedSliding WindowBest Time to Buy/Sell Stock, Longest Substring Without Repeating ThuStack & QueueValid Parentheses, Min Stack, Daily Temperatures FriLinked ListsReverse Linked List, Merge Two Sorted Lists, Linked List Cycle SatReviewRe-solve any problems you struggled with SunRest—

Week 2: Trees & Graphs

DayTopicKey Problems MonBinary TreesMax Depth, Same Tree, Subtree of Another Tree TueBST OperationsValidate BST, Kth Smallest, Lowest Common Ancestor WedBFSLevel Order Traversal, Rotting Oranges, Word Ladder ThuDFSNumber of Islands, Pacific Atlantic Water Flow FriGraph TheoryClone Graph, Course Schedule, Topological Sort SatReviewFocus on graph patterns — most frequently tested SunRest—

Week 3: Advanced Algorithms

DayTopicKey Problems MonBinary SearchSearch in Rotated Array, Find Minimum in Rotated Array TueHeap / Priority QueueTop K Frequent Elements, Find Median from Data Stream WedBacktrackingSubsets, Permutations, Combination Sum ThuDynamic Programming IClimbing Stairs, House Robber, Coin Change FriDynamic Programming IILongest Increasing Subsequence, Word Break SatTimed practice2 random Medium problems in 45 minutes SunRest—

End of Phase 1 checkpoint: You should be able to solve most LeetCode Medium problems in 20–25 minutes. If not, repeat this phase.

Phase 2: Depth & System Design (Weeks 4–7)

Week 4–5: Hard Problems & Patterns

Daily target: 2 problems (1.5 hours) + pattern study (30 min)

Focus on these high-frequency patterns:

Monotonic Stack — Next Greater Element, Largest Rectangle in Histogram
Trie — Implement Trie, Word Search II
Union-Find — Number of Connected Components, Accounts Merge
Interval Problems — Merge Intervals, Meeting Rooms II, Insert Interval
Bit Manipulation — Single Number, Counting Bits
Greedy — Jump Game, Task Scheduler, Gas Station

Week 6: System Design Fundamentals

Daily target: 1 system design deep-dive (2 hours) DayTopicStudy MonScaling basicsLoad balancers, horizontal vs vertical scaling, CDNs TueDatabasesSQL vs NoSQL, sharding, replication, consistency models WedCachingRedis, Memcached, cache invalidation strategies ThuMessage queuesKafka, SQS, pub/sub patterns, event-driven architecture FriAPI DesignREST, GraphQL, gRPC, rate limiting, pagination SatPracticeDesign a URL shortener end-to-end SunRest—

Week 7: System Design Practice

DaySystemCompany Focus MonDesign a Chat SystemMeta (WhatsApp) TueDesign a News FeedMeta, Google WedDesign a Video PlatformGoogle (YouTube), Amazon (Prime) ThuDesign an E-commerce SystemAmazon FriDesign a Search EngineGoogle SatDesign a Notification SystemAll companies SunReview and rest—

End of Phase 2 checkpoint: You should be able to design a distributed system in 35 minutes with proper capacity estimation, data modelling, and trade-off analysis.

Phase 3: Behavioural & Mock Interviews (Weeks 8–10)

Week 8: Build Your Story Bank

Prepare 8–10 stories from your career that cover:

CategoryNumber of Stories Technical challenges you solved2–3 Conflicts or disagreements2 Leadership / mentoring moments1–2 Failures and what you learned1–2 Impact on business metrics1–2

Each story should work for multiple questions. A single "production outage" story can answer:

*Tell me about a challenging technical problem*
*Describe a time you worked under pressure*
*How do you handle ambiguity?*

Week 9: Full Mock Interview Rounds

Do 3 full mock interviews this week: MockFormatFocus Mock 145 min coding (2 problems)Speed and accuracy Mock 245 min system designStructure and depth Mock 345 min behavioralSTAR delivery, conciseness

Use Topalupu's AI mock interviews or practice with a friend. Record yourself and review the recording — you'll catch verbal tics, long pauses, and unclear explanations.

Week 10: Company-Specific Prep

Research your target company's specific interview format:

CompanyUnique ElementHow to Prepare GoogleCore Competencies roundPrepare 5 STAR stories focused on ambiguity and impact AmazonLeadership Principles x 16Map each LP to a specific story from your bank MetaProduct Sense (E5+)Practice defining metrics and proposing experiments AppleTeam-matching interviewsResearch specific teams and their tech stacks Microsoft"As Appropriate" final roundPrepare for high-level career vision questions NVIDIADeep technical interviewBrush up on systems programming, concurrency

Phase 4: Peak Performance (Weeks 11–12)

Week 11: Full-Loop Simulations

Simulate 2 complete interview days: Day 1: Full Google-style loop (4 hours)

9:00 — Coding Round 1 (45 min)
10:00 — Coding Round 2 (45 min)
11:00 — System Design (45 min)
12:00 — Behavioral (45 min)

Day 2: Full Amazon-style loop (5 hours)

9:00 — Coding + LP combo (60 min)
10:30 — System Design (60 min)
12:00 — LP Deep Dive 1 (60 min)
1:30 — LP Deep Dive 2 + Bar Raiser (60 min)

Week 12: Taper & Confidence

This week is about sharpening, not learning new material. DayActivityDuration MonReview your weakest 10 coding problems2 hours TueRun through all system design templates1.5 hours WedRehearse your 10 behavioral stories out loud1 hour Thu1 easy + 1 medium problem (keep skills warm)45 min FriReview company-specific notes30 min Sat–SunRest completely0 hours

Critical: Do NOT cram the night before. Sleep is the single biggest factor in interview performance. Studies show that sleep deprivation reduces problem-solving ability by 30–40%.

The Numbers: How Much Practice Is Enough?

Based on data from candidates who received FAANG offers:

MetricSuccessful Candidates (Median) Total problems solved150–200 Unique patterns mastered15–20 Mock interviews completed8–12 System designs practised10–15 Behavioral stories prepared8–10 Total prep time200–300 hours

Quality over quantity: Solving 150 problems with deep understanding beats grinding 500 problems without learning patterns. Focus on understanding WHY each approach works, not memorising solutions.

Common Mistakes to Avoid

Grinding LeetCode Hard from day 1 — Build foundations first, Hard problems later
Skipping system design — This round eliminates more senior candidates than coding
Neglecting behavioral prep — "I'll just wing it" is the #1 reason for rejection at the behavioral stage
Not practising under time pressure — Every interview is timed, practice with a timer
Studying alone for 12 weeks — Mock interviews with another person are 3x more effective than solo practice

How Topalupu Accelerates Your Prep

Topalupu is built for exactly this kind of structured preparation:

Company-specific problem sets mapped to real interview patterns
AI mock interviews across coding, system design, and behavioural
Progress tracking showing your readiness by topic and company
Timed practice mode simulating real interview pressure
Instant AI feedback on code quality, approach, and communication

Start your 12-week journey with a system that adapts to your skill level.