Senior Full Stack .Net Developer (React)

The second volume of Grokking the System Design Interview, aimed at senior and staff (L5/L6) design rounds. It works through harder case studies such as a payment system, flash sale, notification service, unique ID generator, Gmail, Reddit, Google Calendar and a code judging system, then goes beneath them with patterns like quorum, write-ahead logs and vector clocks and deep dives into Dynamo, Cassandra, Kafka, Chubby, HDFS, GFS and BigTable.

• System design
• Backend
• Job search

The original Grokking system design course, which made the design round learnable. It teaches a repeatable interview approach and the key trade-offs (SQL versus NoSQL, strong versus eventual consistency, REST versus RPC and more), then works through 15 classic designs such as a URL shortener, Instagram, Dropbox, Twitter, YouTube, a rate limiter, a web crawler, Uber and Ticketmaster, each with requirements, estimates and trade-off discussion.

• System design
• Job search
• Backend

A beginner friendly, text based course on relational database design: data modelling, entity relationship diagrams, keys and integrity constraints, functional dependencies and normalisation up to BCNF and beyond. It finishes with nine case studies, from hospital and bank systems to an Instagram style app, e-commerce and ticket booking. For developers and students who want to design schemas that stay pleasant to work with years later.

• Web
• Databases
• System design
• Backend

A browsable practice library of coding problems that can be filtered by pattern, data structure, difficulty and company, so you can drill exactly the weakness you found this week. Patterns include two pointers, sliding window, hash maps, stacks, backtracking and greedy algorithms, with company filters for Google, Meta, Microsoft, Amazon, Oracle and LinkedIn. Free to browse, with an in-browser editor and solutions.

• Job search
• DSA

Over two thousand free programming tutorials, organised into tidy multi-part crash courses: modern JavaScript, Node.js, React, Vue, Firebase, MongoDB, Laravel, React Native, Flutter, testing, Git and, more recently, AI coding tools. Each series builds one thing step by step in short episodes. It suits beginners and developers who want a structured, bite-sized introduction to a new tool.

• Web
• Programming
• Frontend
• Backend

A free GitHub link hub by Arpit Adlakha covering data structures and algorithms, low-level design and high-level system design. It gathers pattern write-ups for dynamic programming, sliding window and binary search, video lectures, practice sites, low-level design questions with solutions, system design reading and database design articles. It is a directory rather than original teaching material, last updated in December 2024.

• Job search
• DSA
• System design