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Insights for engineering leaders

Hiring strategies, LATAM talent trends, and engineering leadership — from people who do this every day.

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Postel's Law and the Limits of Being Liberal
Engineering Culture
July 26, 20268 min read

Postel's Law and the Limits of Being Liberal

Postel's Law: be conservative in what you send, liberal in what you accept. Why it built the internet, and why modern engineers now temper it.

RE
Roberto Espinoza
Amdahl's Law: Why More Cores Hit a Wall
Leadership
July 26, 20268 min read

Amdahl's Law: Why More Cores Hit a Wall

Amdahl's Law: the serial fraction of a task caps parallel speedup, so 10% serial work means a 10x ceiling. Why it applies to teams too.

RE
Roberto Espinoza
The Fallacies of Distributed Computing
Engineering Culture
July 26, 20269 min read

The Fallacies of Distributed Computing

The eight fallacies of distributed computing: false assumptions like 'the network is reliable' that quietly break distributed systems. Why they still bite.

RE
Roberto Espinoza
Idempotency: The Key to Safe Retries
Engineering Culture
July 26, 20268 min read

Idempotency: The Key to Safe Retries

Idempotency and safe retries: why distributed systems double-charge customers, and how an idempotency key makes an operation safe to repeat.

RE
Roberto Espinoza
Cache Invalidation: The Second Hard Problem
Engineering Culture
July 26, 20268 min read

Cache Invalidation: The Second Hard Problem

Cache invalidation: caching is the cheapest speedup and the source of the nastiest bugs. The staleness tradeoffs and why it's a senior skill.

RE
Roberto Espinoza
Kernighan's Law: Don't Write Clever Code
Engineering Culture
July 19, 20268 min read

Kernighan's Law: Don't Write Clever Code

Kernighan's Law: debugging is twice as hard as writing code, so maximally clever code is code you can't debug. Why simple wins.

RE
Roberto Espinoza
YAGNI: You Aren't Gonna Need It
Engineering Culture
July 19, 20268 min read

YAGNI: You Aren't Gonna Need It

YAGNI: why building presumptive features costs you three times over. Fowler's build, delay, and carry costs, and when to break the rule.

RE
Roberto Espinoza
Span of Control: How Many Reports Is Too Many?
Leadership
July 19, 20268 min read

Span of Control: How Many Reports Is Too Many?

Span of control for engineering managers: guidance lands near 5-10 reports for knowledge work, and engagement drops as spans grow.

RE
Roberto Espinoza
Do Referral Hires Actually Perform Better?
Leadership
July 19, 20268 min read

Do Referral Hires Actually Perform Better?

Do referral hires perform better? Data shows referrals stay far longer than job-board hires. The ROI, and the homogeneity risk to manage.

RE
Roberto Espinoza
Does It Really Cost 100x to Fix a Bug Later?
Engineering Culture
July 19, 20269 min read

Does It Really Cost 100x to Fix a Bug Later?

The cost of fixing bugs later: Boehm's 100x curve is widely cited and heavily contested. What holds up, and what to do about it.

RE
Roberto Espinoza
Most of the Features You Build Go Unused
Leadership
July 19, 20268 min read

Most of the Features You Build Go Unused

Most features go unused: Pendo found 56% of features never used and 12% driving 80% of usage. Why building less beats building more.

RE
Roberto Espinoza
Dependency Risk: Your Code Is Mostly Other People's
Engineering Culture
July 19, 20269 min read

Dependency Risk: Your Code Is Mostly Other People's

Dependency and supply-chain risk: ~95% of open-source vulnerabilities sit in transitive dependencies. What left-pad and Log4Shell taught us.

RE
Roberto Espinoza
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