LeetCode-Style Problems for Fintech and Social Media Apps

Solve real-world coding problems from fintech and social media apps — built for interview and industry prep.

What you'll learn
Solve real-world algorithmic problems commonly encountered in fintech and social app development.
Implement advanced data structures like hash maps, sets, and queues in Swift.
Apply depth-first and breadth-first search techniques to practical graph-based challenges.
Understand and implement the sliding window technique for efficient data analysis.
Build and traverse adjacency lists to solve user relationship and clustering problems.
Use Union-Find to identify connected components in a network graph.
Apply sweep-line algorithms to determine maximum concurrency from login session data.
Write optimized Swift code that meets performance constraints for large input sizes.
Analyze algorithm complexity (time and space) to justify design decisions.
Develop and debug Swift code in a testable format similar to LeetCode environments.

Requirements
Basic Swift programming knowledge – understanding of variables, constants, functions, and control flow.
Familiarity with Swift collections – arrays, dictionaries, sets, and how to iterate over them.
Introductory knowledge of Xcode – ability to run and test Swift code in Xcode.
Experience writing simple Swift functions – particularly working with parameters and return values.
Basic understanding of time and space complexity – at least the concept of O(n) and O(1).
Comfort with reading and tracing through code – ability to understand existing Swift code.
Interest in iOS app development concepts – such as user sessions, transactions, and messaging.
Understanding of simple data structures – like stacks, queues, hash maps, and sets.
Ability to follow algorithmic logic – such as loops, conditionals, and recursive calls.
Willingness to learn through coding challenges – with patience and persistence to debug and test.

Description
Are you an iOS developer trying to sharpen your Swift skills and break into top tech companies like Meta, PayPal, or Stripe? Or maybe you're self-taught and frustrated by algorithm tutorials that feel like they're written for computer science majors? This course is built for you.“LeetCode-Style Problems for Fintech and Social Media Apps” is a practical, challenge-driven course that combines interview-level coding exercises with real-world Swift scenarios pulled from fintech and social media development.We’ve designed each module to simulate real engineering problems — like tracking user logins, identifying the most active accounts, grouping users into friend circles, and calculating the busiest times in an app. These are exactly the types of problems you’ll face in interviews, or when working on scalable iOS products.But unlike other courses, we don’t throw CS jargon at you and expect it to make sense.This course breaks down topics like graph traversal, union-find, trees, and sliding windows in plain English.No theory-dumping. No academic fluff. Just clear, example-driven teaching and practical applications.You’ll learn:How to use Depth-First Search (DFS) and Breadth-First Search (BFS) in social graphs without memorizing academic patternsWhen and how to apply sliding window logic to time-based app dataWhat Union-Find really is, and how it’s used to group related users — without requiring a CS degree to follow alongHow to count frequency, detect duplicates, and sort custom logic efficiently with Swift’s built-in toolsHow to write clean Swift code that passes interviews and makes sense to other developersThis course includes:Real-world LeetCode-style challengesGuided coding walkthroughsClear visual breakdowns of data structures like trees, graphs, and hash mapsOptimized Swift solutions with explanations you can actually understandWhether you’re prepping for a coding interview, trying to become a more confident Swift developer, or applying your skills to real product logic, this course will help you think like a problem-solver — not just a coder.No computer science background required. Just bring your curiosity, your laptop, and a desire to actually understand the logic behind professional Swift development.

Who this course is for:
Aspiring iOS developers who want to strengthen their Swift coding skills through real-world coding challenges., Computer science students looking to practice algorithmic problem-solving in Swift using fintech and social media contexts., iOS engineers preparing for technical interviews at companies like Meta, Google, or startups., Self-taught developers who want structured problem-solving practice to fill in CS knowledge gaps., Developers switching to mobile development who want to understand Swift syntax through practical exercises., Bootcamp graduates ready to transition from tutorials to applying coding concepts in real-world-style problems., Junior developers aiming to improve their grasp of data structures and algorithms using Swift., Professionals in fintech or social apps who want to understand the logic behind core features like user sessions, transactions, and messaging., Udemy learners focused on algorithm mastery in preparation for coding interviews with a focus on Swift., Developers interested in building scalable features commonly seen in finance and social networking apps.