Lucas Fernandes

too late to talk about github’s recent absorption by micro$oft?

it's never too late for a good article. right?

_github is **not required**_

ignoring alternatives is risky. find a backup for your preferred tools

blog.edwardloveall.com/lets-make-su...

#softwareengineering

how cool is using a piece of software that feels like home? 🏠

check out my latest blog post: jaggies-weekly.netlify.app/make-vs-code...

#learninginpublic #devlife #vscode

TIL: about pure functions in functional programming

depends only in its inputs; same input = always same output; no hidden state, no side effects, immutable (return a new thing instead of changing state)

#ruby #functionalprogramming #devlife

Release First release! 🎉 · lsfernandes92/panda-tray Pandinhe first release! 🎉 Release date: August 26, 2025 Version: v1.0.0 🌟 What's inside? I'm excited to introduce Pandinhe first release! Tired of a boring menu bar? Meet Pandinhe! Pandinhe is an ...

meet pandinhe! 🐼

a humble attempt at adding humor to a release note piece 😅

github.com/lsfernandes9...

#devlife

TIL: ruby, though dynamic, benefits from static type checking

type checking occurs in runtime; ruby 3 adds .rbs files for type info; offers levels of checking; can use type profiler to detect type conflicts

ruby abstracts type checking, keeping benefits without redundant declarations

#ruby

✨today I found out that I can theme vscode with CSS and inspect elements with devtools, just like we do in browsers.

how cool is that? 🤓

an editor is a software that we use regularly in our daily lives. for me, any effort to make it appealing and easy to navigate is worth doing.

#devlife #vscode

I've just dropped a new blog post about how I practice vocabulary learning to retain more information and strengthen my brain connections. ✨

Check it out at: jaggies-weekly.netlify.app/how-do-i-pra...

#learninginpublic

TIL: automatic memory management with reference counting

each memory has a reference count; when variables refers to it, increase count; stopping, decreases it; count == 0, memory freed; needs extra space per object; good for real-time apps, but can cause memory leaks

#memorymanagement #devlife

TIL: when system detects programs running low memory, it pauses program & runs garbage collector

GC compacts heap, updates references & releases unreachable memory; uses "generations" where long-lived memory cleared less often; causes program random pauses; unsuitable for real-time apps

#devlife

manually deallocation = predictable performance = lower memory overhead = more bugs

automatically deallocation = free the programmer from the burden = performance variations/overhead

TIL: about memory leak

it's when an allocated memory isn't deallocated and OS can't reclaim it; becomes unusable until program ends; long-running programs, leaks cause crashes; double-deallocation can corrupt active memory, causing security risks & unpredictable crashes

#devlife #memorymanagement

TIL: about memory management

systems allocate and free memory during program execution; older languages lack automatic memory management, so programmers must explicitly handle it; one allocation = one deallocation; uses ram, cpu registers, cpu cache, and virtual memory

#devlife #memorymanagement

push CDN: requires engineering effort to propagate updates to the CDN caches; the first request is fast bc CDN server doesn't need to travel to the original server. more control over cache timing

TIL: every CDN server has its own local cache with two main strategies to populate it

pull CDN (most common): lazily fetches content, requires low maintenance, but the first request is slower and assets can become stale. cache busting helps if we don't want stale content

#softwareengineer #cdn

TIL: CDNs minimize latency for distant clients because there's always a CDN server nearby

CDN = content delivery network; geographically distributed servers that cache assets from origin server efficiently; reduces bandwidth usage and server load; essential for global scale

#softwareengineering

Hey folks! 👋🏻

I'm available for hire!

I can communicate effectively, I'm a passionate learner and love sharing knowledge. I'm looking for remote or on-site Mid-level or Semi-Senior Software Engineer roles, either part-time or full-time.

Find out more: jaggies-weekly.netlify.app/im-available...

TIL: nginx isn't just a load balancer, it's a web server, reverse proxy, cache, mail proxy & A/B testing tool. Despite its performance, misconfigs can actually add latency. watch settings: caching, proxy rules, complex routing, decryption, rate limiting.

#softwareengineering #softwarearchitecture

modernizing a legacy monolith? strangler fig pattern can help you with that without downtime. audit your system: evaluate the functionality; map all component dependencies; assess failure risks.

#softwareengineering #softwarearchitecture

TIL: there is a special architectural pattern called "strangler fig pattern" that facilitates the gradual replacement and modernization of legacy systems.

#softwareengineering #softwarearchitecture

solutions: use apache flink for distributed state management; use monitoring and observability tools like prometheus, grafana and confluent to track down and resolve issues; use a kafka "checkpoints" + exactly-once semantics to prevent data loss and duplication of events

TIL: stream-based architecture trade-offs: 1) hard state management - bc distributed systems + data streams; 2) complex debugging - bc traditional tools fail with fast data; 3) ensure fault tolerance - must ensure data integrity & prevent loss

#softwareengineering #softwarearchitecture

I also discovered that I’m a passive learner (I think we all are since our brains tend to be lazy). To counter this, I need to consciously stay active by explaining what I’ve just learned. It’s an effective way to keep my brain engaged.

Recently, I decided to try #obsidian as my study note-taking tool. I've been amazed to discover how much I enjoy watching new files appear as I learn. I love that satisfying sense of progress when I see the left sidebar's explorer growing. It honestly feels like my brain is getting stronger! 😅

Meu último trampo foi na gringa e tinha aproximadamente 4 anos de experiência. Atualmente quero voltar pro mercado gringo, mas tou tendo dificuldades. Minhas principais queixas são a falta de vaga pra júnior/pleno, e muitas das vagas remotas são localizadas - tipo remote (US-only).

TIL: Turbo Stream do real-time updates via Web Socket which is a communication protocol that provides full-duplex communication channels over a single TCP connection between a client and a server. With that, we gain a powerful reactive server feature. This is so neat!

#hotwire #rails #rubyonrails

How did you manage to install all of this with one CLI command and the `rails new` command?

I am curious... And how did you do that? 😅

Sorry, wasn't able to DM you. Just to confirm... only remote for the countries listed on the JD. Right? Could you kindly confirm if this opportunity is available for LATAM (Brazil specifically) devs?

Did you notice that Rails 7 scaffold generators add status code 422 to create and update actions when the resource couldn't be saved? That was a breaking change, and now invalid form submissions must return a 422 for Turbo Drive to replace the body and display the form errors.

#rails #rubyonrails

Hire me! - Tim Riley After 15 years at Buildkite, Culture Amp and Icelab, I’m available for hire! I’m an effective, versatile and compassionate technical leader, and an accomplished Rubyist. I’m looking for remote Princi...

After 15 years off the market, I’m available for hire!

I’m an effective, versatile and compassionate technical leader, and an accomplished Rubyist. I’m looking for remote Principal or Staff Engineer roles, at 4 days/week.

Find out more: timriley.info/posts/hire-me