How would you build TinyURL?

"The role is a TPM under Alexa, but seems really like a project manager role- review privacy features. HM round was very basic, one PM loop asked a product design question, however the interviewer always cutting off the answer after 2-3 sentences; the most strange part was the tech lead round- a pure system design question which didn't mentioned in prep call at all. Wend very deep around 45 mins."

"The Overall Interview ProcessStep 1: Online Assessment (OA): A 60-90 minute screening on platforms like Codility or HackerRank, often featuring 2 LeetCode Medium coding questions and sometimes logic or SQL-based multiple-choice questions.Step 2: Technical Screening (often via Karat): A live technical interview with a third-party partner like Karat. This focuses on core Data Structures and Algorithms (DSA) and fundamental software engineering principles.Step 3: Technical Deep-Dive / Team Panel: A more thorough session with Citi engineers focusing on System Design, Java/Python specifics (like multithreading or database ACID properties), and a deep-dive into your past project architecture.Step 4: Hiring Manager / Behavioral Round: A "culture fit" discussion using the STAR method to evaluate your teamwork and communication, often ending with HR discussions on salary and policy"

"Interview process was straightforward with standard components: Leetcode (2 rounds), System Design (2 rounds), Behavioural (1 round). Leetcode is of level Medium to Hard, with practice. You can probably do it."