Week 9 of CS50 is where everything comes together. I built C$50 Finance — a full-stack stock trading web app using Flask, SQLite, and Python — complete with real-time stock lookups, user authentication, portfolio tracking, and transaction history. Here's what the build actually looked like, what tripped me up, and what I learned about thinking like a real software engineer.

CS50 Week 9 starts with a birthday tracker — a deceptively simple Flask app that taught me more about full-stack thinking than I expected. I built full CRUD functionality, added server-side validation, and designed a custom warm peach CSS theme from scratch. Here's exactly how it all came together.

CS50x Week 8 is the first week where the output is something you can open in a browser and show to someone — a JavaScript trivia quiz and a complete four-page developer portfolio. The portfolio goes well beyond the spec, featuring a seven-theme colour switcher powered by CSS custom properties, localStorage persistence, Intersection Observer scroll animations, and a fully responsive Bootstrap 5 layout. Here is how both came together.

CS50x Week 7 introduces SQL through three very different databases — Spotify's top 100 songs, an IMDb movie database with thirteen progressively complex queries, and the Fiftyville mystery where SQL alone is used to solve a crime. Each problem builds on the last, and by the end of the week writing multi-table joins and nested subqueries starts to feel completely natural. Here is how all three came together.

CS50x Week 6 is where the language switches from C to Python — and the difference is immediately obvious. The first four problems are sentimental re-implementations of earlier weeks, rebuilt in far fewer lines, while DNA is a brand-new challenge: a profiling program that reads STR counts from a CSV database and matches them against a DNA sequence to identify an individual. Here is how all five problems came together and what the language switch actually teaches you.

CS50x Week 5 is where memory management becomes the whole point — two problems that cover recursive struct allocation, pointer-based family trees, hash tables, and the kind of disciplined free() practice that Valgrind keeps you honest about. From simulating blood type inheritance across three generations to building a spell checker that loads 143,000 words into a hash table, this week is one of the most technically rewarding in the course. Here is how both problems came toget

CS50x Week 4 gets right down to the level of bytes and memory — three problems that involve reading and writing binary file formats directly in C. From scaling WAV audio samples to applying image filters with the Sobel operator, and recovering deleted JPEG files from a raw disk image, this week is where low-level programming starts to feel genuinely powerful. Here is how all three came together.

CS50x Week 3 covers some of the most interesting problems in the course — from a simple plurality election system to the Tideman ranked pairs voting algorithm, complete with cycle detection and a directed candidate graph. There is also a sorting algorithm analysis problem that puts Bubble Sort, Merge Sort, and Selection Sort side by side. Here is how all four problems came together and what they teach you about algorithms and data structures in C.

CS50x Week 2 is where arrays, strings, and command-line arguments start to feel real — three problem sets that cover everything from Scrabble scoring to text readability grades and a working substitution cipher. Each one builds on the last and teaches you something different about how C handles data. Here is how all three came together and what made them worth building.

CS50x Week 1 is where you write your first real C programs — from a simple Hello World to a double-sided Mario pyramid and a credit card validator using Luhn's algorithm. It is the week that teaches you how to actually think like a programmer. Here is how it went and what it was like to build all three problem sets from scratch.

CS50 Week 0 Scratch game inspired by Shahnameh and Prince of Persia, featuring Rostam and Sohrab, health system mechanics, and Persian literary themes.

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