Hi everyone I'm really happy to see new community members in coder trader. I'm thinking about holding the Q&A session. It can be about the trading system course or how to get set up with algos. I was hoping to do it Sunday morning. Does this work well for everyone please suggest anytime if that doesn't work for you.

Hi everyone, I am a options trader looking to better understand trading systems.

Ever changed ONE line of code and watched your entire app collapse? There's a name for that — software rot. Robert C. Martin coined the term, and the cure is something every serious developer needs to know: SOLID. Here's the cheat sheet: S — Single Responsibility One class. One reason to change. If your class is doing 5 things, any change can break the other 4. Split it up. O — Open/Closed Add new features WITHOUT touching existing working code. Use abstractions instead of if/else chains that grow forever. L — Liskov Substitution Any child class must be a drop-in replacement for its parent. If you can't swap them without things breaking, your design is wrong. I — Interface Segregation Don't hand someone a massive toolbox when they need a screwdriver. Keep interfaces small and focused. D — Dependency Inversion High-level logic should never be welded to low-level details. Use abstractions (think: plug and outlet, not soldering a lamp into the wall). The payoff? Code that's maintainable, flexible, reliable, lean, and testable. But here's the real talk — SOLID isn't a rigid rulebook. It's a toolkit. The skill is knowing when to apply each principle and when to bend the rules. Which of these do you struggle with the most? Drop it below 👇

Just added a new bonus to the 7-Day Trading System course — a full walkthrough on WebSockets and how to stream live order book data from Deribit using async Python. Here's what's inside: → What WebSockets are and why every exchange uses them → REST polling vs WebSockets (and why polling is killing your edge) → The upgrade handshake — how HTTP becomes ws:// → Async producer/consumer architecture with asyncio.Queue → Full working code: connect to Deribit, subscribe to BTC-PERPETUAL order book, and process updates in real time → Production tips: reconnection, heartbeats, persistence, multi-symbol This is the same pattern used in professional trading infrastructure — one coroutine receives data from the exchange, another processes it independently. Clean separation. Backpressure built in. Swap out the processor for your own strategy logic without touching the receiver. If you're building anything that touches live market data, this is foundational. Go check it out inside the course. Drop a 🔥 if you want more content like this.

I thought this was a great question someone asked from our Facebook community. I just wanted to share the response here. Q Are web sockets the way to go for ensuring state updates on every tick, brother? It's definitely a crucial aspect of dynamic functionality. A I think on cryptocurrency exchanges websockets are maybe your only choice. Some exchanges do offer fix. But to ensure correctness you should take periodic snapshots and compare that with whatever you have been maintaining with a websocket. Another good practice is to keep track of the sequence number in your updates have small checks in your code to ensure they are correct.