Matheus Lima
@terriblesoftware.org
💡 Posting about Software, Management, and Tech
👨💻 Engineering Manager @ Tremendous
🚀 Previously, Sr. Software Engineer @ Carta
✍️ terriblesoftware.org
👨💻 Engineering Manager @ Tremendous
🚀 Previously, Sr. Software Engineer @ Carta
✍️ terriblesoftware.org
Pinned
Matheus Lima
@terriblesoftware.org
· Dec 5
The 6 Mistakes You’re Going to Make as a New Manager
Transitioning from an individual contributor to a manager is tough but rewarding. The key is to delegate, find new sources of fulfillment, focus on quality over quantity, maintain proper engagement…
terriblesoftware.org
If you're a new manager, or about to become one, these insights are for you.
I realized that many of the mistakes I've made during my transition into management are very common, and that's why I decided to write this down.
terriblesoftware.org/2024/12/04/t...
I realized that many of the mistakes I've made during my transition into management are very common, and that's why I decided to write this down.
terriblesoftware.org/2024/12/04/t...
I spent weeks looking for an iPad math app for my 6yo
Most of them were bad. Notifications, streaks, weird ads, systems designed to keep her hooked
So I decided to vibe code her something without any addictive shady patterns
She's been loving it, so I'm making it open source and sharing it
Most of them were bad. Notifications, streaks, weird ads, systems designed to keep her hooked
So I decided to vibe code her something without any addictive shady patterns
She's been loving it, so I'm making it open source and sharing it
January 15, 2026 at 12:48 PM
I spent weeks looking for an iPad math app for my 6yo
Most of them were bad. Notifications, streaks, weird ads, systems designed to keep her hooked
So I decided to vibe code her something without any addictive shady patterns
She's been loving it, so I'm making it open source and sharing it
Most of them were bad. Notifications, streaks, weird ads, systems designed to keep her hooked
So I decided to vibe code her something without any addictive shady patterns
She's been loving it, so I'm making it open source and sharing it
I switched everything (podcasts, YouTube, audiobooks) to 1x speed.
New rule: if it's not worth consuming at 1x, it's not worth consuming at all.
terriblesoftware.org/2026/01/08/l...
New rule: if it's not worth consuming at 1x, it's not worth consuming at all.
terriblesoftware.org/2026/01/08/l...
Life Happens at 1x Speed
Why I stopped consuming content at 2x speed, and the simple rule that changed how I listen to everything.
terriblesoftware.org
January 8, 2026 at 1:05 PM
I switched everything (podcasts, YouTube, audiobooks) to 1x speed.
New rule: if it's not worth consuming at 1x, it's not worth consuming at all.
terriblesoftware.org/2026/01/08/l...
New rule: if it's not worth consuming at 1x, it's not worth consuming at all.
terriblesoftware.org/2026/01/08/l...
"I want to grow, but my manager isn't giving me the right opportunities."
I hear this a lot. Here's the thing: even the best manager can only do so much. If you want growth, start creating your own opportunities.
terriblesoftware.org/2026/01/05/c...
I hear this a lot. Here's the thing: even the best manager can only do so much. If you want growth, start creating your own opportunities.
terriblesoftware.org/2026/01/05/c...
Creating Your Own Opportunities
The best career opportunities don’t necessarily come from your manager. They come from seeing potential in the boring work already on your plate.
terriblesoftware.org
January 5, 2026 at 12:51 PM
"I want to grow, but my manager isn't giving me the right opportunities."
I hear this a lot. Here's the thing: even the best manager can only do so much. If you want growth, start creating your own opportunities.
terriblesoftware.org/2026/01/05/c...
I hear this a lot. Here's the thing: even the best manager can only do so much. If you want growth, start creating your own opportunities.
terriblesoftware.org/2026/01/05/c...
January: "maybe a few people will read this"
Today: 230,000+ unique visitors, two #1 Hacker News posts, and a lot of emails from strangers
My (writing) year in review:
terriblesoftware.org/2025/12/29/a...
Today: 230,000+ unique visitors, two #1 Hacker News posts, and a lot of emails from strangers
My (writing) year in review:
terriblesoftware.org/2025/12/29/a...
A Year of Writing for Myself (That 230,000+ People Read)
I started this blog about a year ago with pretty modest expectations. It started as a place to organize my thoughts on management, engineering, and everything else in between. I figured maybe a few…
terriblesoftware.org
December 29, 2025 at 2:39 PM
January: "maybe a few people will read this"
Today: 230,000+ unique visitors, two #1 Hacker News posts, and a lot of emails from strangers
My (writing) year in review:
terriblesoftware.org/2025/12/29/a...
Today: 230,000+ unique visitors, two #1 Hacker News posts, and a lot of emails from strangers
My (writing) year in review:
terriblesoftware.org/2025/12/29/a...
I wrote about AI and got backlash from an unexpected direction.
Engineers didn't argue AI would replace them; they argued it couldn't even write code. That's... concerning.
terriblesoftware.org/2025/12/19/t...
Engineers didn't argue AI would replace them; they argued it couldn't even write code. That's... concerning.
terriblesoftware.org/2025/12/19/t...
The Strange Case of Engineers Who Dismiss AI
Some engineers dismiss AI coding tools as ‘garbage’ without trying modern versions. Their outdated opinions are costing them.
terriblesoftware.org
December 19, 2025 at 1:06 PM
I wrote about AI and got backlash from an unexpected direction.
Engineers didn't argue AI would replace them; they argued it couldn't even write code. That's... concerning.
terriblesoftware.org/2025/12/19/t...
Engineers didn't argue AI would replace them; they argued it couldn't even write code. That's... concerning.
terriblesoftware.org/2025/12/19/t...
I've been thinking about what AI actually changes for software engineers, and what it doesn't.
Wrote some thoughts:
terriblesoftware.org/2025/12/11/a...
Wrote some thoughts:
terriblesoftware.org/2025/12/11/a...
AI Can Write Your Code. It Can’t Do Your Job.
The companies building AI are spending billions to acquire engineers, not replace them. Here’s why your job is safer than you think.
terriblesoftware.org
December 11, 2025 at 5:07 PM
I've been thinking about what AI actually changes for software engineers, and what it doesn't.
Wrote some thoughts:
terriblesoftware.org/2025/12/11/a...
Wrote some thoughts:
terriblesoftware.org/2025/12/11/a...
The thing that actually makes you senior isn't architecture or communication or ownership. It's being the person who makes fuzzy things concrete.
terriblesoftware.org/2025/11/25/w...
terriblesoftware.org/2025/11/25/w...
What Actually Makes You Senior
The one skill that separates senior engineers from everyone else isn’t technical. It’s the ability to take ambiguous problems and make them concrete.Retry
terriblesoftware.org
November 25, 2025 at 5:31 PM
The thing that actually makes you senior isn't architecture or communication or ownership. It's being the person who makes fuzzy things concrete.
terriblesoftware.org/2025/11/25/w...
terriblesoftware.org/2025/11/25/w...
New post is out 🔥
If you're copy-pasting AI responses as code review feedback, you're not helping. You're just creating more work for everyone else.
Your teammates need YOUR thoughts, not ChatGPT's generic advice.
terriblesoftware.org/2025/10/24/c...
If you're copy-pasting AI responses as code review feedback, you're not helping. You're just creating more work for everyone else.
Your teammates need YOUR thoughts, not ChatGPT's generic advice.
terriblesoftware.org/2025/10/24/c...
“ChatGPT said this” Is Lazy
When you paste ChatGPT’s response instead of your own feedback, you’re not being helpful. You’re being lazy and creating more work for everyone.
terriblesoftware.org
October 24, 2025 at 3:40 PM
New post is out 🔥
If you're copy-pasting AI responses as code review feedback, you're not helping. You're just creating more work for everyone else.
Your teammates need YOUR thoughts, not ChatGPT's generic advice.
terriblesoftware.org/2025/10/24/c...
If you're copy-pasting AI responses as code review feedback, you're not helping. You're just creating more work for everyone else.
Your teammates need YOUR thoughts, not ChatGPT's generic advice.
terriblesoftware.org/2025/10/24/c...
Politics isn't manipulation and backstabbing. It's understanding how decisions actually get made and learning to navigate that reality.
Refusing to engage doesn't make politics go away. It just means you lose by default.
terriblesoftware.org/2025/10/01/s...
Refusing to engage doesn't make politics go away. It just means you lose by default.
terriblesoftware.org/2025/10/01/s...
Stop Avoiding Politics
Most engineers think workplace politics is dirty. They’re wrong. Refusing to play politics doesn’t make you noble; it makes you ineffective.
terriblesoftware.org
October 1, 2025 at 5:35 PM
Politics isn't manipulation and backstabbing. It's understanding how decisions actually get made and learning to navigate that reality.
Refusing to engage doesn't make politics go away. It just means you lose by default.
terriblesoftware.org/2025/10/01/s...
Refusing to engage doesn't make politics go away. It just means you lose by default.
terriblesoftware.org/2025/10/01/s...
Reposted by Matheus Lima
ICYMI: this week's Balanced Engineer Newsletter has three articles to be a more balanced software engineer:
✨ An interactive overview of Big O Notation from @samwho.dev
✨ What shouldn't be written by AI from Sean Goedecke
✨ The management skill no one talks about from @terriblesoftware.org
✨ An interactive overview of Big O Notation from @samwho.dev
✨ What shouldn't be written by AI from Sean Goedecke
✨ The management skill no one talks about from @terriblesoftware.org
The Balanced Engineer • Issue #34
Diving into Big O Notation, exploring AI content norms, and understanding the management skill that nobody talks about with content from Sam Rose, Sean Goedecke, and Matheus Lima!
archives.balancedengineer.com
August 25, 2025 at 1:50 PM
ICYMI: this week's Balanced Engineer Newsletter has three articles to be a more balanced software engineer:
✨ An interactive overview of Big O Notation from @samwho.dev
✨ What shouldn't be written by AI from Sean Goedecke
✨ The management skill no one talks about from @terriblesoftware.org
✨ An interactive overview of Big O Notation from @samwho.dev
✨ What shouldn't be written by AI from Sean Goedecke
✨ The management skill no one talks about from @terriblesoftware.org
Read a parenting book recently (stay with me here) that completely changed how I think about management.
Turns out the most important skill isn't avoiding mistakes, it's what you do after making them.
terriblesoftware.org/2025/08/22/t...
Turns out the most important skill isn't avoiding mistakes, it's what you do after making them.
terriblesoftware.org/2025/08/22/t...
The Management Skill Nobody Talks About
“There is a crack in everything. That’s how the light gets in.” — Leonard Cohen Let me tell you something that will happen after you become a manager: you’re going to mess u…
terriblesoftware.org
August 22, 2025 at 12:48 PM
Read a parenting book recently (stay with me here) that completely changed how I think about management.
Turns out the most important skill isn't avoiding mistakes, it's what you do after making them.
terriblesoftware.org/2025/08/22/t...
Turns out the most important skill isn't avoiding mistakes, it's what you do after making them.
terriblesoftware.org/2025/08/22/t...
"Be the pilot, not the turbulence."
Great parenting advice that's equally true for management.
Great parenting advice that's equally true for management.
August 4, 2025 at 2:34 PM
"Be the pilot, not the turbulence."
Great parenting advice that's equally true for management.
Great parenting advice that's equally true for management.
Reposted by Matheus Lima
This is a thought provoking, bite sized little piece that boils down to, "don't give feedback on EVERYTHING, because not everything matters! give feedback on things that have impact."
I think it's a *great* exercise for the feedback-giver to think through the impact they want their advice to have.
I think it's a *great* exercise for the feedback-giver to think through the impact they want their advice to have.
How much of your feedback is actually about performance vs. personal preference?
If you can't point to specific impact, maybe the behavior that needs changing is yours.
terriblesoftware.org/2025/07/18/w...
If you can't point to specific impact, maybe the behavior that needs changing is yours.
terriblesoftware.org/2025/07/18/w...
Why Most Feedback Shouldn’t Exist
Before giving feedback, ask yourself: is there measurable impact? Most manager feedback is just personal preference disguised as professional development. Stop policing personality.
terriblesoftware.org
July 30, 2025 at 12:04 AM
This is a thought provoking, bite sized little piece that boils down to, "don't give feedback on EVERYTHING, because not everything matters! give feedback on things that have impact."
I think it's a *great* exercise for the feedback-giver to think through the impact they want their advice to have.
I think it's a *great* exercise for the feedback-giver to think through the impact they want their advice to have.
How much of your feedback is actually about performance vs. personal preference?
If you can't point to specific impact, maybe the behavior that needs changing is yours.
terriblesoftware.org/2025/07/18/w...
If you can't point to specific impact, maybe the behavior that needs changing is yours.
terriblesoftware.org/2025/07/18/w...
Why Most Feedback Shouldn’t Exist
Before giving feedback, ask yourself: is there measurable impact? Most manager feedback is just personal preference disguised as professional development. Stop policing personality.
terriblesoftware.org
July 18, 2025 at 4:15 PM
How much of your feedback is actually about performance vs. personal preference?
If you can't point to specific impact, maybe the behavior that needs changing is yours.
terriblesoftware.org/2025/07/18/w...
If you can't point to specific impact, maybe the behavior that needs changing is yours.
terriblesoftware.org/2025/07/18/w...
The faster tech changes, the more valuable the things that don't change become.
New post on why fundamentals matter more than ever:
terriblesoftware.org/2025/07/14/w...
New post on why fundamentals matter more than ever:
terriblesoftware.org/2025/07/14/w...
What Doesn’t Change
Why the faster tech evolves and AI advances, the more valuable computer science fundamentals become. Understanding principles beats chasing trends.
terriblesoftware.org
July 14, 2025 at 2:56 PM
The faster tech changes, the more valuable the things that don't change become.
New post on why fundamentals matter more than ever:
terriblesoftware.org/2025/07/14/w...
New post on why fundamentals matter more than ever:
terriblesoftware.org/2025/07/14/w...
Built a tiny zsh plugin that's been super helpful for me - converts natural language to shell commands.
Just 5KB, no dependencies. Would love feedback!
github.com/matheusml/zsh-ai
Just 5KB, no dependencies. Would love feedback!
github.com/matheusml/zsh-ai
June 27, 2025 at 4:02 PM
Built a tiny zsh plugin that's been super helpful for me - converts natural language to shell commands.
Just 5KB, no dependencies. Would love feedback!
github.com/matheusml/zsh-ai
Just 5KB, no dependencies. Would love feedback!
github.com/matheusml/zsh-ai
After 10+ years as an engineer, I became the thing I used to complain about: a manager.
Finally wrote about why this relationship is so broken (and how to fix it):
terriblesoftware.org/2025/06/24/w...
Finally wrote about why this relationship is so broken (and how to fix it):
terriblesoftware.org/2025/06/24/w...
Why Engineers Hate Their Managers (And What to Do About It)
Discover why engineers hate managers, the common management anti-patterns that destroy trust, and practical solutions from someone who’s been on both sides.
terriblesoftware.org
June 24, 2025 at 1:36 PM
After 10+ years as an engineer, I became the thing I used to complain about: a manager.
Finally wrote about why this relationship is so broken (and how to fix it):
terriblesoftware.org/2025/06/24/w...
Finally wrote about why this relationship is so broken (and how to fix it):
terriblesoftware.org/2025/06/24/w...
When AI says, "You're absolutely right!", something bad usually follows
June 12, 2025 at 6:08 PM
When AI says, "You're absolutely right!", something bad usually follows
Reposted by Matheus Lima
Fantastic explanation of the challenges of developing in a codebase over time
My fave line: “Every new requirement makes it slightly worse, but never quite bad enough to justify a complete rewrite.”
terriblesoftware.org/2025/05/28/d...
My fave line: “Every new requirement makes it slightly worse, but never quite bad enough to justify a complete rewrite.”
terriblesoftware.org/2025/05/28/d...
Duplication Is Not the Enemy
We’re taught to eliminate duplication at all costs. But the wrong abstraction is far more expensive than a little copy-paste. Here’s why.
terriblesoftware.org
June 9, 2025 at 3:30 PM
Fantastic explanation of the challenges of developing in a codebase over time
My fave line: “Every new requirement makes it slightly worse, but never quite bad enough to justify a complete rewrite.”
terriblesoftware.org/2025/05/28/d...
My fave line: “Every new requirement makes it slightly worse, but never quite bad enough to justify a complete rewrite.”
terriblesoftware.org/2025/05/28/d...
Last year I wrote about how AI won't replace programmers — just like COBOL, OOP, and Low Code didn't.
Got a lot of heat for it. "This time is different!" they said.
A year later, we're still here. Still shipping. Still needed.
terriblesoftware.org/2024/12/14/w...
Got a lot of heat for it. "This time is different!" they said.
A year later, we're still here. Still shipping. Still needed.
terriblesoftware.org/2024/12/14/w...
We’ve Been Here Before
Technological advancements have empowered engineers to focus on creativity and strategy. AI will similarly elevate human insight, generating growth and innovation.
terriblesoftware.org
June 9, 2025 at 3:54 PM
Last year I wrote about how AI won't replace programmers — just like COBOL, OOP, and Low Code didn't.
Got a lot of heat for it. "This time is different!" they said.
A year later, we're still here. Still shipping. Still needed.
terriblesoftware.org/2024/12/14/w...
Got a lot of heat for it. "This time is different!" they said.
A year later, we're still here. Still shipping. Still needed.
terriblesoftware.org/2024/12/14/w...
Really good post.
I don't necessarily agree with "but the craft" section, because if engineers stop loving what they do... they'll probably stop doing it.
But again, great post.
fly.io/blog/youre-a...
I don't necessarily agree with "but the craft" section, because if engineers stop loving what they do... they'll probably stop doing it.
But again, great post.
fly.io/blog/youre-a...
My AI Skeptic Friends Are All Nuts
My smartest friends have bananas arguments about LLM coding.
fly.io
June 3, 2025 at 4:05 PM
Really good post.
I don't necessarily agree with "but the craft" section, because if engineers stop loving what they do... they'll probably stop doing it.
But again, great post.
fly.io/blog/youre-a...
I don't necessarily agree with "but the craft" section, because if engineers stop loving what they do... they'll probably stop doing it.
But again, great post.
fly.io/blog/youre-a...
Hot take: Stop following DRY so religiously.
I've seen more codebases destroyed by premature abstraction than by duplication. Sometimes copy-paste is the right answer.
New post: terriblesoftware.org/2025/05/28/d...
I've seen more codebases destroyed by premature abstraction than by duplication. Sometimes copy-paste is the right answer.
New post: terriblesoftware.org/2025/05/28/d...
Duplication Is Not the Enemy
We’re taught to eliminate duplication at all costs. But the wrong abstraction is far more expensive than a little copy-paste. Here’s why.
terriblesoftware.org
May 28, 2025 at 6:54 PM
Hot take: Stop following DRY so religiously.
I've seen more codebases destroyed by premature abstraction than by duplication. Sometimes copy-paste is the right answer.
New post: terriblesoftware.org/2025/05/28/d...
I've seen more codebases destroyed by premature abstraction than by duplication. Sometimes copy-paste is the right answer.
New post: terriblesoftware.org/2025/05/28/d...
Reposted by Matheus Lima
Your engineers don't want you to make them "happy" — they want you to help them ship meaningful work.
terriblesoftware.org/2025/05/16/m...
terriblesoftware.org/2025/05/16/m...
Manage For Success, Not Comfort
Great managers build effective engineering teams focused on results, not just team comfort. Success drives satisfaction—not the other way around.
terriblesoftware.org
May 16, 2025 at 5:58 PM
Your engineers don't want you to make them "happy" — they want you to help them ship meaningful work.
terriblesoftware.org/2025/05/16/m...
terriblesoftware.org/2025/05/16/m...
Your engineers don't want you to make them "happy" — they want you to help them ship meaningful work.
terriblesoftware.org/2025/05/16/m...
terriblesoftware.org/2025/05/16/m...
Manage For Success, Not Comfort
Great managers build effective engineering teams focused on results, not just team comfort. Success drives satisfaction—not the other way around.
terriblesoftware.org
May 16, 2025 at 5:58 PM
Your engineers don't want you to make them "happy" — they want you to help them ship meaningful work.
terriblesoftware.org/2025/05/16/m...
terriblesoftware.org/2025/05/16/m...