Sign in

Juan Cruz Martinez

@jcmartinez.dev
49 followers 75 following 483 posts

I stream, blog, and make youtube videos about tech stuff. I love coding, I love React, and I love building stuff!

PostsRepliesMedia
Juan Cruz Martinez @jcmartinez.dev · 8m
It's confirmed, the credits are a consolation price for reducing your usage limits by 50%. SI seems more expensive than AI 😂
000
Juan Cruz Martinez @jcmartinez.dev · 3h
Codex remote connections are far superior than anything else I tried.
000
Juan Cruz Martinez @jcmartinez.dev · 10h
Ta-da! Is this because now my €200/month plan provides the same value as the €20/month was providing until yesterday? I need to make good use of them.
001
Juan Cruz Martinez @jcmartinez.dev · 12h
The first app I build with my 8 years old son today hit the App Store. It’s an app to learn new languages, build for kids by a kid. It’s fun, and they can learn vocabulary and conversations they can use with other kids. apps.apple.com/us/app/ling...
200
Juan Cruz Martinez @jcmartinez.dev · 29/09/2026
After every meaningful project, write a short note: • What problem did we solve? • Why did it matter? • What options did we consider? • What tradeoffs did we make? • What changed because of the work? • What should we remember next time?
100
Juan Cruz Martinez @jcmartinez.dev · 28/09/2026
If you can solve a problem but cannot teach the decision, the team still depends on you. Use mentoring to make your judgment inspectable. Can you explain:
100
Juan Cruz Martinez @jcmartinez.dev · 27/09/2026
If every hard decision still ends with you, you haven’t built autonomy. You’ve built a queue.
000
Juan Cruz Martinez @jcmartinez.dev · 26/09/2026
Anyone out there really calling it out SI? 🤣🤣🤣
000
Juan Cruz Martinez @jcmartinez.dev · 26/09/2026
Only you are responsible for you own career growth. Don’t wait for annual reviews or manager feedback to tel you where to improve.
100
Juan Cruz Martinez @jcmartinez.dev · 25/09/2026
Life is life, work is works and AI is a tool newsletter.thelongcommit.com/p/when-ever...
newsletter.thelongcommit.com
When Everything Points in the Same Direction
On ambition, work, side projects, and making space for the life happening around you.
000
Juan Cruz Martinez @jcmartinez.dev · 25/09/2026
Today I opened vim and I struggle to access some shortcuts. I thought it was already muzzle memory. This is the true sign that agentic coding is deteriorating my coding skills.
000
Juan Cruz Martinez @jcmartinez.dev · 25/09/2026
A move into engineering management can change what you need from technical reading. If your work has shifted from writing Rust to architecture decisions, a book on system design may serve you better than more Rust internals.
000
Juan Cruz Martinez @jcmartinez.dev · 23/09/2026
AI made it easier for me to keep working into evenings and weekends. I was shipping more, but also putting in more hours. Was I more productive because of AI or because the extra hours? newsletter.thelongcommit.com/p/everythin...
newsletter.thelongcommit.com
Everything I Learned About Productivity Disagrees With How AI Wants Me to Work
I built my productivity system over fifteen years. AI stressed it in six months.
000
Juan Cruz Martinez @jcmartinez.dev · 22/09/2026
Last week I traveled to Amsterdam for #AGNTCon + #MCPCon to represent @auth0 and it was truly amazing experience, having great talks with engineers and builders.
100
Juan Cruz Martinez @jcmartinez.dev · 22/09/2026
It happens to me every single time! I set up an amazing recurring prompt, I’m amazed by how well it works. Two days later I couldn’t care any less about it, and I hate the fact that I don’t like the output and I need to correct it all the time. My love for AI is short lived!
000
Juan Cruz Martinez @jcmartinez.dev · 21/09/2026
When you ask your manager for more responsibility, name the engineering work you want to own. Agree on timing and a follow-up so you can check whether your role has actually changed.
000
Juan Cruz Martinez @jcmartinez.dev · 20/09/2026
Visibility is not bragging. It’s helping people understand the value of your work. A simple playbook: 👇🧵
100
Juan Cruz Martinez @jcmartinez.dev · 19/09/2026
If an agent helps change its own access controls, who independently checks that small edits haven't weakened monitoring or tests? newsletter.thelongcommit.com/p/slowing-a...
newsletter.thelongcommit.com
Slowing AI Down Won’t Be Enough
A security perspective on pacing the frontier, the systems we trust to contain AI, and the human oversight we risk losing.
110
Juan Cruz Martinez @jcmartinez.dev · 18/09/2026
An AI scan flags an essay from a writer you've enjoyed for years. Even an accurate score leaves the trust question open: is their judgment still worth following? My July essay: newsletter.thelongcommit.com/p/the-ai-sc...
newsletter.thelongcommit.com
The AI Score Answers the Wrong Question
AI can help with prose. The author still has to supply the judgment and own the result.
000
Juan Cruz Martinez @jcmartinez.dev · 17/09/2026
The greatest productivity hack is not AI, it’s your engineering culture.
000
Juan Cruz Martinez @jcmartinez.dev · 16/09/2026
Code gets you started. Judgment, communication, and trust carry you further.
000
Juan Cruz Martinez @jcmartinez.dev · 16/09/2026
If you're considering another internal role, start coaching a colleague through the module only you know how to maintain. Making that responsibility transferable can keep it from tying you to your current role.
000
Juan Cruz Martinez @jcmartinez.dev · 15/09/2026
An engineer's “Cursor thinks you’re wrong” may be worth hearing. Ask what they recommend and what evidence supports it; using the model can remain part of the discussion. newsletter.thelongcommit.com/p/the-pr-sh...
newsletter.thelongcommit.com
The PR Shipped. Did the Engineer Grow?
AI can improve engineering output while weakening the signals managers use to evaluate growth.
000
Juan Cruz Martinez @jcmartinez.dev · 14/09/2026
By May, I was letting agents’ code through on non-critical projects. What bothered me was how much that category had grown: work I once considered critical had started feeling routine. newsletter.thelongcommit.com/p/i-didnt-k...
newsletter.thelongcommit.com
I Didn't Know How Much I'd Handed Over to AI
The drift from skeptical user to autopilot, and the discipline I built to fight it.
000
Juan Cruz Martinez @jcmartinez.dev · 14/09/2026
The real thread to your software engineering job is not AI. It’s the engineer who knows how to use AI properly, specify requirements clearly, evaluate architectural trade-offs, and can optimize for token consumption.
000
Juan Cruz Martinez @jcmartinez.dev · 13/09/2026
If you want to be an engineer you’ll have to spend a lot of time learning real engineering first. Once you are a capable engineer, start with the AI tools. The other way around doesn’t work.
000
Juan Cruz Martinez @jcmartinez.dev · 13/09/2026
The strongest engineers are not always the fastest coders. They are the ones who make the fewest expensive decisions.
000
Juan Cruz Martinez @jcmartinez.dev · 12/09/2026
AI researchers: AI will kill us all in 10 years AI CEOs: we need 300B so we kill us all before someone else’s AI kills us all. Me: how many R’s in strawberry?
000
Juan Cruz Martinez @jcmartinez.dev · 12/09/2026
The fastest way to grow is not to write more code. It’s to take responsibility for bigger outcomes.
100
Juan Cruz Martinez @jcmartinez.dev · 11/09/2026
You’ll learn more in one hour of doing something than in a lifetime of prompting about it.
000
Juan Cruz Martinez @jcmartinez.dev · 11/09/2026
The best engineering leaders don’t optimise for faster decisions. They optimise for decision quality. Speed only matters when the decision creates meaningful progress.
000
Juan Cruz Martinez @jcmartinez.dev · 10/09/2026
Do people saying learn AI today or you'll fall behind realize that whatever you think you learn about AI last year applies today?
000
Juan Cruz Martinez @jcmartinez.dev · 10/09/2026
In a US panel, frequent AI users more often thought technology could eliminate their job within five years. Sept 9 CSH research summary, across occupations. csh.ac.at/events/inte...
csh.ac.at
Interpreting AI At Work: Direct Use, Workplace Support, And Technological Displacement Concerns * Complexity Science Hub
What happens when employees are asked to embrace a technology that may also threaten their jobs? In this talk, Christos Makridis examines how workers
100
Juan Cruz Martinez @jcmartinez.dev · 10/09/2026
A difficult conversation can run past its calendar slot. As a new engineering manager, leave some time unassigned by accepting less planned work, so a longer conversation doesn't take your evening. newsletter.thelongcommit.com/p/the-new-e...
newsletter.thelongcommit.com
The New Engineering Lead’s Guide to Time Management
A practical guide to protecting your calendar, delegating earlier, making better decisions, and creating space for your team to do good work.
000
Juan Cruz Martinez @jcmartinez.dev · 09/09/2026
Management filled my reading with leadership, DevRel and writing. After my holiday, I wanted to read something unrelated to work, too. newsletter.thelongcommit.com/p/when-ever...
newsletter.thelongcommit.com
When Everything Points in the Same Direction
On ambition, work, side projects, and making space for the life happening around you.
010
Juan Cruz Martinez @jcmartinez.dev · 09/09/2026
Considering your first engineering management role? Look at the work you'd be learning: helping people deliver, communicating intent, handling competing priorities. If those responsibilities appeal to you, don’t let doubt take over. newsletter.thelongcommit.com/p/the-case-...
newsletter.thelongcommit.com
The Case for Becoming a Manager
I read an article recently arguing that senior engineers shouldn't become managers. Observations are mostly right. The conclusion is still wrong. I made the switch last year and here's what I learned.
000
Juan Cruz Martinez @jcmartinez.dev · 09/09/2026
I finally tackled a monitoring dashboard I'd been postponing after AI gave me a starting point. It took about as long to finish, but I no longer dreaded the work. newsletter.thelongcommit.com/p/everythin...
newsletter.thelongcommit.com
Everything I Learned About Productivity Disagrees With How AI Wants Me to Work
I built my productivity system over fifteen years. AI stressed it in six months.
010
Juan Cruz Martinez @jcmartinez.dev · 08/09/2026
When you ask a senior engineer to coach a colleague through a difficult decision, make room for it in their workload. That coaching needs time beyond the review comment that started the conversation.
000
Juan Cruz Martinez @jcmartinez.dev · 08/09/2026
You don’t need to chase every new tool to stay relevant. But you do need to keep learning before the market forces you to.
001
Juan Cruz Martinez @jcmartinez.dev · 07/09/2026
AI can make you faster. It can also make you passive. Don’t outsource the parts that build judgment: • Understanding the problem • Thinking through tradeoffs • Reviewing carefully • Learning from mistakes • Explaining your decisions Use AI to increase leverage. Not to avoid thinking.
110
Juan Cruz Martinez @jcmartinez.dev · 07/09/2026
When an AI assistant follows a written procedure, editing that procedure can change how it treats a customer or how the system behaves at all. If markdown controls the application flow, then Md is how you write software. newsletter.thelongcommit.com/p/markdown-...
newsletter.thelongcommit.com
Markdown Is Becoming the Application Layer of AI Apps
Why AI apps are moving from framework-heavy orchestration to harnesses plus Markdown.
010
Juan Cruz Martinez @jcmartinez.dev · 06/09/2026
CompTIA estimates tech occupations gained 86,000 jobs in August while tech companies cut 14,700. This is just an estimation, and it's early still, but so far AI agents seem to be augmenting our capacities rather than replacing us. www.comptia.org/en-us/resou...
comptia.org
CompTIA Tech Jobs Report | CompTIA Research
CompTIA’s Tech Jobs Report provides a monthly snapshot of IT employment trending at the occupation and industry levels.
000
Juan Cruz Martinez @jcmartinez.dev · 06/09/2026
AI will make coding faster. That makes engineering judgment more valuable, not less.
010
Juan Cruz Martinez @jcmartinez.dev · 05/09/2026
AI can widen an experienced builder’s scope. The judgment behind that breadth still takes years to build. If junior roles shrink, how do the next senior builders develop it? newsletter.thelongcommit.com/p/i-think-a...
newsletter.thelongcommit.com
I Think a New Role Is Emerging in Tech
It doesn't have a name yet, but it's already reshaping how teams build software.
000
Juan Cruz Martinez @jcmartinez.dev · 05/09/2026
A team can spend three years working around a bad technical decision to avoid a three-month rewrite. The rewrite has a project plan, a deadline, and an estimate. The workaround is paid off quietly: one exception, one incident, a slower change at a time.
000
Juan Cruz Martinez @jcmartinez.dev · 04/09/2026
Good work does not always speak for itself. Sometimes it needs a clear explanation from the person who did it.
000
Juan Cruz Martinez @jcmartinez.dev · 04/09/2026
Saying "yes" to everything is the fastest way to burning out. Knowing what to work on, and say "no" to other things is crucial.
000
Juan Cruz Martinez @jcmartinez.dev · 03/09/2026
I'll be at AGNTCon in Amsterdam on Sep 17th and 18th staffing the Auth0 booth. If you are around, please make sure to come by and say hi! Would love to connect with you all.
000
Juan Cruz Martinez @jcmartinez.dev · 03/09/2026
Dev-tool funnels count visits and signups. An agent can choose an SDK before either, leaving the losing company no failed conversion to inspect. Part of go-to-market now lives in the product surface the agent reads. newsletter.thelongcommit.com/p/the-gtm-f...
newsletter.thelongcommit.com
The GTM for Developer Tools Is Breaking in Two Places at Once
A product manager opens Cursor on a Tuesday afternoon.
000
Juan Cruz Martinez @jcmartinez.dev · 02/09/2026
A comfortable job can still leave your career stuck. Before deciding whether to stay, look at the last year or two, not one bad week. Are you still learning and building work you can point to? newsletter.thelongcommit.com/p/dont-wast...
newsletter.thelongcommit.com
Don’t Waste Your Career Getting Comfortable
Your job can be going well while your career quietly stalls
000