sami selim

von Neumann gave us "zero-sum" in 1944 and it's one of my favorite examples of linguistic compression. Two words that mean “strictly competitive, fixed pie, stop looking for win-wins.” The term's real gift: it reveals the default human assumption that life is chess and value…

programmers are making $10k-200k monthly on polymarket here's how they actually do it /// 1. arbitrage bots buy YES + NO when combined price < $1 example: YES at 48¢ + NO at 49¢ = 97¢ total you lock $0.03 profit per $1 no matter who wins trader "distinct-baguette" made…

Five points of how we can handle this! 1. Stop relying on IP-only rate limits Distributed bots make IP limits useless. Rate-limit primarily on identity (user, API key, session, device), with IP as a secondary signal. 2. Use multi-dimensional limits, not one blunt fixed rule…

👩‍💻 Practice these 150+ Algorithms ❍ C/C++ ❍ Java ❍ Python ❍ JavaScript ❍ Rust/Go Or, any language of your choice Stay in top 5% of programmers in 2026.

7 Multithreading Design Patterns Multithreading is a computational model that enables a single program (process) to execute multiple tasks concurrently. These tasks are called threads, lightweight units of execution that share the same process resources (memory space, open…

I genuinely don’t understand who uses GitHub Desktop. All you need to use git efficiently is just these 28 commands: git clone git log git status git add . git add <path> git diff git commit -m "Short description" git commit -am "Short description" git commit -a --amend git…

If you want to future-proof your career as a distributed systems programmer, stop chasing frameworks and start mastering the primitives that every large system is built on. These are the things that will still matter 30–50 years from now, regardless of language, cloud, or hype…

Sharing my notes from how Typeahead Search works behind the scenes. Covered : > Scoping > Data Structures > ML Ranking > Scaling (Replication) > Edge Optimization. Checkout my Substack 👇 (Subscribe if it helps !)

Does “WhatsApp” use WebSockets or gRPC? Short answer: No. What WhatsApp uses WhatsApp uses a custom messaging protocol built on top of MQTT over TCP/TLS. What is MQTT? MQTT (Message Queuing Telemetry Transport) is a lightweight publish–subscribe messaging protocol designed…

Every authentication method explained in one picture !! 1. Basic Authentication Basic Authentication sends the username and password in every request, encoded using Base64. The encoding is reversible, so it must always be used over HTTPS. While simple, it lacks features like…

Microservices is the software industry’s most successful confidence scam. It convinces small teams that they are “thinking big” while systematically destroying their ability to move at all. It flatters ambition by weaponizing insecurity: if you’re not running a constellation of…

Bash Scripting Basics

𝗖𝗼𝗺𝗽𝘂𝘁𝗲𝗿 𝘀𝗰𝗶𝗲𝗻𝗰𝗲 𝗽𝗿𝗶𝗻𝗰𝗶𝗽𝗹𝗲𝘀 (cheat code) 🔹 𝗛𝗮𝘀𝗵𝗶𝗻𝗴 – to get constant-time key lookups, e.g. user sessions in a cache. 🔹 𝗦𝗼𝗿𝘁𝗶𝗻𝗴 – to get fast binary search, e.g. lookup in a sorted list of IDs. 🔹 𝗜𝗻𝗱𝗲𝘅𝗶𝗻𝗴 / 𝗕-𝘁𝗿𝗲𝗲𝘀 – to get…

1. Algebra is good for problem-solving. 2. Geometry is good for visual thinking. 3. Calculus is good for understanding change. 4. Statistics is good for decision-making. 5. Number theory is good for logical discipline. 6. Linear algebra is good for modern science and…

If you want to surf securely from a public location, you don't need a VPN. You just need encrypted DNS, which is available for free and easy to turn on. Here's how.

Without a VPN, the public WiFi can track which IPs you visit. They can reverse those to see where you went. But that is all. They can't see your traffic, URL, subdomain, or query. Just the IP address. If that matters to you, get a VPN. And then they'll only know that you're…

Just created a complete analysis of AI infrastructure opportunities covering chip manufacturers, power companies and system integrators. I shared this analysis with my 20,000+ students. For 24 hours, it's yours for FREE. Like, RT & Comment "AI" and I'll DM it to you.

C Programming Projects Collection for Beginners! Here’s what’s inside: - Notes Manager CLI (C + SQLite) - SHA-512 Implementation - Arithmetic Compiler - Lexical Analyser - Asteroid Game - FTP server - HTTP Server - UDP Server-Client - Port Scanner - Ping Implementation…

The right way to learn C is to understand how it translates to assembly/machine code and what the CPU will do as a result. Presenting - "C Language (Using RISC-V ISA)" This course dives into the practical applications of the C language, emphasizing hands-on learning to solidify…

Everyone thinks they could write an operating system. Here's a list of security vulnerabilities in the screenshot! CWE-426 (Untrusted search path): execvp(cmd->name, cmd->args) searches PATH. If this program ever runs with elevated privileges (setuid, started by a privileged…