Frontend Interview Prep: Building a Web Spreadsheet Engine

When interviewing for senior frontend engineering roles, standard algorithm puzzles are no longer enough. Top-tier companies evaluate your ability to design and implement complex, interactive applications like a collaborative web spreadsheet. This text-based course guides you step-by-step through solving this classic senior-level interview problem from scratch. You will transition from writing basic UI components to architecting a robust reactive system. By understanding how to parse formulas, build an Abstract Syntax Tree (AST), and manage cell dependencies, you will demonstrate the deep engineering skills that interviewers look for in senior candidates. What you'll learn: - Understand the core architecture of a reactive, cell-based spreadsheet engine - Parse mathematical formulas and build a custom Abstract Syntax Tree (AST) in JavaScript - Resolve cell dependencies and evaluate complex arithmetic operations reliably - Manage application state efficiently to prevent circular reference errors - Practice writing clean, maintainable, and highly performant frontend code under interview conditions Starting with foundational computer science concepts like parsing and dependency graphs, this course breaks down the spreadsheet problem into logical, readable modules. You will study clear code explanations, analyze structural design patterns, and learn how to explain your technical decisions clearly to an interviewer. This course is designed for intermediate to advanced frontend developers preparing for system design and practical coding interviews. No prior compiler or parser experience is required, as all foundational concepts are explained from the ground up. Equip yourself with the architectural patterns needed to ace your next senior frontend interview.