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Our new book, Mobile System Design Interview, is available on Amazon! Check Out Now Book author: Manuel Vicente Vivo 𝐖𝐡𝐚𝐭’𝐬 𝐢𝐧𝐬𝐢𝐝𝐞?- An insider's take on what interviewers really look for and why. - A 5-step framework for solving any mobile system design interview question. - 7 real mobile system design interview questions with detailed solutions. ...

WorkOS AuthKit: Simplify Auth in Your Next.js App (Sponsored)Building auth in Next.js means managing redirects, handling tokens and sessions, and making sure it all works across routes—even in edge environments like Vercel. WorkOS AuthKit solves this with a fully hosted login UI that supports SSO, MFA, passwordless auth, and password-based login. It handles redirects, token exchange, and session logic with minimal config. ...

Every modern application, from a ride-hailing service to an e-commerce platform, relies on data, and behind that data sits a database. Whether it's storing customer profiles, tracking inventory, or logging user actions, the database is more than just a storage engine. It's the core system that holds an application’s state together. When the database fails, everything else (APIs, front-end, business logic) comes tumbling down. Therefore, choosing the right kind of database is critical, but it isn't a one-size-fits-all decision.  ...

This is a guest post by Chris Bell, CTO of Knock There’s a lot of talk right now about building AI agents, but not a lot out there about what it takes to make those agents truly useful. An Agent is an autonomous system designed to make decisions and perform actions to achieve a specific goal or set of goals, without human input. No matter how good your agent is at making decisions, you will need a person to provide guidance or input on the agent’s path towards its goal. After all, an agent that cannot interact or respond to the outside world and the systems that govern it will be limited in the problems it can solve. ...