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Raul Junco Profile
Raul Junco

@RaulJuncoV

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I simplify System Design, and System Design will make you a better Software Engineer. System Design • Databases • Algorithms • AI Enthusiast

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Joined June 2020
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@RaulJuncoV
Raul Junco
3 years
I have been in backend development for more than 15 years. It is a challenging field and It took me some time to find my path to becoming a good one. But if I started over, these are the 6 steps I would follow. 1 of 6.
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@RaulJuncoV
Raul Junco
11 hours
Retries Have an Evil Twin: Duplicates. Retries are supposed to make systems reliable. But they can also break everything; silently. And if you’re not careful… your system pays the price. - A user gets charged twice.- An order is processed again.- The same message keeps
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@RaulJuncoV
Raul Junco
1 day
RT @RaulJuncoV: Your coding skills won't save you in a system design interview. Your architecture intuition will. And intuition? You buil….
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@RaulJuncoV
Raul Junco
2 days
Your coding skills won't save you in a system design interview. Your architecture intuition will. And intuition? You build them by solving real problems every single day. That’s why I’m building Join Enginuity:. → One system design challenge, daily.→ Streaks, badges,
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@RaulJuncoV
Raul Junco
3 days
RT @RaulJuncoV: Speed is easy. Context is everything. Senior devs know this. If you're not spending more time planning than writing code,….
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@RaulJuncoV
Raul Junco
3 days
Speed is easy. Context is everything. Senior devs know this. If you're not spending more time planning than writing code, you're doing it wrong. Building features isn’t about typing fast. It’s about knowing what not to touch. Understanding the architecture. Mapping the
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@RaulJuncoV
Raul Junco
4 days
RT @RaulJuncoV: 80% or more of your context lives in your database. MongoDB just turned into a first-class context provider. With the new….
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@RaulJuncoV
Raul Junco
4 days
80% or more of your context lives in your database. MongoDB just turned into a first-class context provider. With the new MCP Server, tools like Copilot, Claude, Windsurf, and VS Code can actually understand your data. Until now, LLMs powering Copilot, Claude, or Cursor wrote
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@RaulJuncoV
Raul Junco
5 days
RT @RaulJuncoV: “AI is coming for low-code platforms.”. I’ve heard that line more than once, and every time, I laugh. Because the people s….
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@RaulJuncoV
Raul Junco
5 days
“AI is coming for low-code platforms.”. I’ve heard that line more than once, and every time, I laugh. Because the people saying it are missing the bigger picture. Low-code platforms aren’t behind. They’re way ahead. They already have:. - Thousands of prebuilt components.-
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@RaulJuncoV
Raul Junco
6 days
RT @RaulJuncoV: Your system isn’t slow because of your code. It’s slow because of your choices. Here’s what actually kills software:. - Yo….
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@RaulJuncoV
Raul Junco
6 days
BTW, I share more real-world dev lessons like this in my newsletter:. And I post a daily question here:. To help you make better decisions, one insight at a time.
joinenginuity.com
Learn coding through daily challenges and interactive tutorials
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@RaulJuncoV
Raul Junco
6 days
Your system isn’t slow because of your code. It’s slow because of your choices. Here’s what actually kills software:. - You chased microservices before understanding the domain. - You made everything async, then couldn’t trace a single bug. - You “overengineered” thinking you
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@RaulJuncoV
Raul Junco
7 days
RT @RaulJuncoV: Observability often dies on bloated dashboards. A friend called me last week. He was trying to figure out why a new featur….
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@RaulJuncoV
Raul Junco
7 days
Observability often dies on bloated dashboards. A friend called me last week. He was trying to figure out why a new feature was running slow. Half a day gone. Thousands of log lines later, he had a guess. Not an answer. That’s the reality for most teams today:. 1. You log
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@RaulJuncoV
Raul Junco
8 days
RT @RaulJuncoV: Meeting-Driven Development is real. And it’s killing your progress. We’ve normalized a workflow where talking about work h….
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@RaulJuncoV
Raul Junco
9 days
I’ve seen firsthand how too many meetings kill focus and slow down real progress. That’s why I write about practical cases to build better systems in my newsletter. And build a platform to practice System Design, one question a day.
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newsletter.systemdesignclassroom.com
A System Design Newsletter to help you build better software. Click to read System Design Classroom, by Raul Junco, a Substack publication with tens of thousands of subscribers.
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@RaulJuncoV
Raul Junco
9 days
Meeting-Driven Development is real. And it’s killing your progress. We’ve normalized a workflow where talking about work has replaced actually doing the work. - 30 minutes of standup.- 1 hour of grooming.- 1 hour of retro.- 1 hour of “alignment”.- 45 minutes for “sync”. And
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@RaulJuncoV
Raul Junco
11 days
RT @RaulJuncoV: Caching is easy to add. Hard to get right. Here are 7 caching concepts that separate a good system from a fragile one:. 1.….
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@RaulJuncoV
Raul Junco
11 days
Two ways you can get better at Systems Design 👇 . Newsletter: Join the community:
joinenginuity.com
Learn coding through daily challenges and interactive tutorials
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