I've dreamed of learning business intelligence and handling big data.

So I went to an university info event today for "MAS Data Science".

Everything's sounded great. Finding insights out of complex datasets, check! Great possibilities and salery.

Yay! 😀

Only after an hour they've explained that the main focus of this course is on leading a library, museum or an archive. 😟 huh why? WTF?

Turns out, they've relabled their librarian education course to Data science for getting peoples attention.

Hey you cocksuckers! I want my 2 hours of wasted life time back!
Fuck this "english title whitewashing"

I've optimised so many things in my time I can't remember most of them.

Most recently, something had to be the equivalent off `"literal" LIKE column` with a million rows to compare. It would take around a second average each literal to lookup for a service that needs to be high load and low latency. This isn't an easy case to optimise, many people would consider it impossible.

It took my a couple of hours to reverse engineer the data and implement a few hundred line implementation that would look it up in 1ms average with the worst possible case being very rare and not too distant from this.

In another case there was a lookup of arbitrary time spans that most people would not bother to cache because the input parameters are too short lived and variable to make a difference. I replaced the 50000+ line application acting as a middle man between the application and database with 500 lines of code that did the look up faster and was able to implement a reasonable caching strategy. This dropped resource consumption by a minimum of factor of ten at least. Misses were cheaper and it was able to cache most cases. It also involved modifying the client library in C to stop it unnecessarily wrapping primitives in objects to the high level language which was causing it to consume excessive amounts of memory when processing huge data streams.

Another system would download a huge data set for every point of sale constantly, then parse and apply it. It had to reflect changes quickly but would download the whole dataset each time containing hundreds of thousands of rows. I whipped up a system so that a single server (barring redundancy) would download it in a loop, parse it using C which was much faster than the traditional interpreted language, then use a custom data differential format, TCP data streaming protocol, binary serialisation and LZMA compression to pipe it down to points of sale. This protocol also used versioning for catchup and differential combination for additional reduction in size. It went from being 30 seconds to a few minutes behind to using able to keep up to with in a second of changes. It was also using so much bandwidth that it would reach the limit on ADSL connections then get throttled. I looked at the traffic stats after and it dropped from dozens of terabytes a month to around a gigabyte or so a month for several hundred machines. The drop in the graphs you'd think all the machines had been turned off as that's what it looked like. It could now happily run over GPRS or 56K.

I was working on a project with a lot of data and noticed these huge tables and horrible queries. The tables were all the results of queries. Someone wrote terrible SQL then to optimise it ran it in the background with all possible variable values then store the results of joins and aggregates into new tables. On top of those tables they wrote more SQL. I wrote some new queries and query generation that wiped out thousands of lines of code immediately and operated on the original tables taking things down from 30GB and rapidly climbing to a couple GB.

Another time a piece of mathematics had to generate all possible permutations and the existing solution was factorial. I worked out how to optimise it to run n*n which believe it or not made the world of difference. Went from hardly handling anything to handling anything thrown at it. It was nice trying to get people to "freeze the system now".

I build my own frontend systems (admittedly rushed) that do what angular/react/vue aim for but with higher (maximum) performance including an in memory data base to back the UI that had layered event driven indexes and could handle referential integrity (overlay on the database only revealing items with valid integrity) or reordering and reposition events very rapidly using a custom AVL tree. You could layer indexes over it (data inheritance) that could be partial and dynamic.

So many times have I optimised things on automatic just cleaning up code normally. Hundreds, thousands of optimisations. It's what makes my clock tick.

Whelp. I started making a very simple website with a single-page design, which I intended to use for managing my own personal knowledge on a particular subject matter, with some basic categorization features and a simple rich text editor for entering data. Partly as an exercise in web development, and partly due to not being happy with existing options out there. All was going well...

...and then feature creep happened. Now I have implemented support for multiple users with different access levels; user profiles; encrypted login system (and encrypted cookies that contain no sensitive data lol) and session handling according to (perceived) best practices; secure password recovery; user-management interface for admins; public, private and group-based sections with multiple categories and posts in each category that can be sorted by sort order value or drag and drop; custom user-created groups where they can give other users access to their sections; notifications; context menus for everything; post & user flagging system, moderation queue and support system; post revisions with comparison between different revisions; support for mobile devices and touch/swipe gestures to open/close menus or navigate between posts; easily extendible css themes with two different dark themes and one ugly as heck light theme; lazy loading of images in posts that won't load until you actually open them; auto-saving of posts in case of browser crash or accidental navigation away from page; plus various other small stuff like syntax highlighting for code, internal post linking, favouriting of posts, free-text filter, no-javascript mode, invitation system, secure (yeah right) image uploading, post-locking...

On my TODO-list: Comment and/or upvote system, spoiler tag, GDPR compliance (if I ever launch it haha), data-limits, a simple user action log for admins/moderators, overall improved security measures, refactor various controllers, clean up the code...

It STILL uses a single-page design, and the amount of feature requests (and bugs) added to my Trello board increases exponentially with every passing week. No other living person has seen the website yet, and at the pace I'm going, humanity will have gone through at least one major extinction event before I consider it "done" enough to show anyone.

help

# Retrospective as Backend engineer

Once upon a time, I was rejected by a startup who tries to snag me from another company that I was working with.
They are looking for Senior / Supervisor level backend engineer and my profile looks like a fit for them.
So they contacted me, arranged a technical test, system design test, and interview with their lead backend engineer who also happens to be co-founder of the startup.

## The Interview

As usual, they asked me what are my contribution to previous workplace.
I answered them with achievements that I think are the best for each company that I worked with, and how to technologically achieve them.

One of it includes designing and implementing a `CQRS+ES` system in the backend.
With complete capability of what I `brag` as `Time Machine` through replaying event.

## The Rejection

And of course I was rejected by the startup, maybe specifically by the co-founder. As I asked around on the reason of rejection from an insider.

They insisted I am a guy who overengineer thing that are not needed, by doing `CQRS+ES`, and only suitable for RND, non-production stuffs.

Nobody needs that kind of `Time Machine`.

## Ironically

After switching jobs (to another company), becoming fullstack developer, learning about react and redux.
I can reflect back on this past experience and say this:

The same company that says `CQRS+ES` is an over engineering, also uses `React+Redux`.
Never did they realize the concept behind `React+Redux` is very similar to `CQRS+ES`.

- Separation of concern
- CQRS: `Command` is separated from `Query`
- Redux: Side effect / `Action` in `Thunk` separated from the presentation
- Managing State of Application
- ES: Through sequence of `Event` produced by `Command`
- Redux: Through action data produced / dispatched by `Action`
- Replayability
- ES: Through replaying `Event` into the `Applier`
- Redux: Through replay `Action` which trigger dispatch to `Reducer`

---

The same company that says `CQRS` is an over engineering also uses `ElasticSearch+MySQL`.
Never did they realize they are separating `WRITE` database into `MySQL` as their `Single Source Of Truth`, and `READ` database into `ElasticSearch` is also inline with `CQRS` principle.

## Value as Backend Engineer

It's a sad days as Backend Engineer these days. At least in the country I live in.
Seems like being a backend engineer is often under-appreciated.
Company (or people) seems to think of backend engineer is the guy who ONLY makes `CRUD` API endpoint to database.

- I've heard from Fullstack engineer who comes from React background complains about Backend engineers have it easy by only doing CRUD without having to worry about application.
- The same guy fails when given task in Backend to make a simple round-robin ticketing system.
- I've seen company who only hires Fullstack engineer with strong Frontend experience, fails to have basic understanding of how SQL Transaction and Connection Pool works.
- I've seen company Fullstack engineer relies on ORM to do super complex query instead of writing proper SQL, and prefer to translate SQL into ORM query language.
- I've seen company Fullstack engineer with strong React background brags about Uncle Bob clean code but fail to know on how to do basic dependency injection.
- I've heard company who made webapp criticize my way of handling `session` through http secure cookie. Saying it's a bad practice and better to use local storage. Despite my argument of `secure` in the cookie and ability to control cookie via backend.

Just came across a site with TERRIBLE CSS and some sort of event handling to block the user from accessing the dev tools.
So in my Chrome, no F12 and no Ctrl+Shift+I.

Well, guess what. The Tools menu in the title bar also contains a link to Developer Tools.

Me: 1 Them: 0

ChatGPT, Copilot, React, how to make a link in a frontend website?
To create a link in a frontend website, create a span, a div, or a paragraph that contains the link text. In your JavaScript web app, add an event listener to that element that opens the link on click. If you want to claim you're accessible, add an aria-role to the clickable element. To make debugging harder and only possible for the real arcane experts, let your framework generate generic ids and class name hashes for styling and event handling, like "item_09fcfck" or "elementor_element_foo_bar". Avoid, at all price, to use an a href element!

ASP.NET Web Forns?

Can't tell how many times I printed out the page lifecycle diagram for myself or a coworker. So many hours lost trying to figure out which lifecycle hook to use for a specific scenario and then have it all break down because something new was added to the feature. Or figuring when data can be bound, or doing some hack because things break when handling a POST event or some shit.

Overly abstract piece of technological excrement. Might as well express the thing in contemporary dance and check that into source control instead of that ungodly mess.

The switch to AJAX and API calls was such a huge relief it's almost hard to explain in words (I can do a dance tho). And then upgrading to AngularJS, man, worlds apart...

I don't care how much they pay me (okay, you got me...), I'm never touching Web Forms again.

In most businesses, self-proclaimed full-stack teams are usually more back-end leaning as historically the need to use JS more extensively has imposed itself on back-end-only teams (that used to handle some basic HTML/CSS/JS/bootstrap on the side). This is something I witnessed over the years in 4 projects.

Back-end developers looking for a good JS framework will inevitably land on the triad of Vue, React and Angular, elegant solutions for SPA's. These frameworks are way more permissive than traditional back-end MVC frameworks (Dotnet core, Symfony, Spring boot), meaning it is easy to get something that looks like it's working even when it is not "right" (=idiomatic, unit-testable, maintainable).

They then use components as if they were simple HTML elements injecting the initial state via attributes (props), skip event handling and immediately add state store libraries (Vuex, Redux). They aren't aware that updating a single prop in an object with 1000 keys passed as prop will be nefarious for rendering performance. They also read something about SSR and immediately add Next.js or Nuxt.js, a custom Node express.js proxy and npm install a ton of "ecosystem" modules like webpack loaders that will become abandonware in a year.

After 6 months you get: 3 basic forms with a few fields, regressions, 2MB of JS, missing basic a11y, unmaintainable translation files & business logic scattered across components, an "outdated" stack that logs 20 deprecation notices on npm install, a component library that is hard to unit-test, validate and update, completely vendor-& version locked in and hundreds of thousands of wasted dollars.

I empathize with the back-end devs: JS frameworks should not brand themselves as "simple" or "one-size-fits-all" solutions. They should not treat their audience as if it were fully aware and able to use concepts of composition, immutability, and custom "hooks" paired with the quirks of JS, and especially WHEN they are a good fit.

The joys of being a multi-project, multi-language developer! You think you'll juggle a couple of balls, but suddenly you're in a full-blown circus act, with chainsaws, flaming torches, and a monkey on your back yelling "more features!"

In the morning, you're all TypeScript: "Yes, of course, types make everything more reliable!" By lunch, you're neck-deep in Python and realize types are a vague suggestion at best, leaving you guessing like some bug-squashing mystic. And then just when you’ve finally wrapped your head around that context switch, FastAPI starts demanding things that make you wonder, "Why can’t we all just get along and be JavaScript?"

Oh, and don’t even get me started on syntax. One minute it’s req.body this and express.json() that. The next, Python’s just there with a smug look, saying, "Indentation is my thing, deal with it!" And don’t look now, because meanwhile, Stripe’s trying to barge in with a million webhooks, payment statuses, and event types like “connect” and “payment,” each a subtle bomb to blow up your error logs.

Of course, every language has its "elegant" way of handling errors—which, translated, means fifty shades of “Why isn’t this working?” in different flavors! But hey, at least the machines can’t see us crying through the screen.

Debug and Prod versions of library that behave differently w/r keyboard event handling!!!

I asked a team member about a simple update for a customer's country/state code and he started saying we should build an event handler and publish and event and I'm like "woah woah... this is before they're engaged."

Thankfully he said, in that case, my original idea of just handling the update is correct. Phew ... that could have been way more complicated than it needed to be.

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Guys, I know this is not stackoverflow, but do you think it will be an overkill to use RxJava for the event handling of a simple uber like app ?

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Maintaining a clean office space is crucial for employee well-being and making a positive impression on clients. If you’re in need of office cleaning Sarasota, look no further than Pro Master Cleaners. Our office cleaning services are designed to ensure that your workplace remains clean, organized, and welcoming. We offer routine cleaning services that include sweeping, mopping, trash removal, and disinfecting high-touch areas. Whether you need weekly, bi-weekly, or one-time cleaning services, we’ll work around your schedule to keep your office in pristine condition.

Sarasota Deep Cleaning
Sometimes a standard cleaning just isn't enough. If you're looking for Sarasota deep cleaning, Pro Master Cleaners offers a comprehensive service that goes beyond surface cleaning to target dirt, grime, and dust in the most hard-to-reach places. Our deep cleaning service is ideal for those looking for a thorough clean of their home, office, or commercial property. We focus on areas like baseboards, behind appliances, and under furniture, ensuring that every inch of your space is spotless. Whether it's for spring cleaning, preparing for a special event, or just to refresh your environment, our deep cleaning service will leave your space looking brand new.

Move Out Cleaning Sarasota
Moving out can be a stressful time, and the last thing you want to worry about is cleaning. That’s where Pro Master Cleaners comes in. We specialize in move out cleaning Sarasota, providing a comprehensive cleaning service to ensure your space is spotless before you leave. Whether you're renting or selling, our team will handle everything from scrubbing floors and cleaning windows to sanitizing the kitchen and bathrooms. Our goal is to leave the space looking pristine so you can focus on your move. We also offer flexible scheduling to accommodate your moving timeline.

Why Choose Pro Master Cleaners?
Experienced Cleaning Professionals: Our team is trained and experienced in handling all types of cleaning tasks, ensuring that your space is cleaned to the highest standards.

Customizable Services: Whether you need move out cleaning, office cleaning, or deep cleaning, we tailor our services to meet your specific needs.

Eco-Friendly Cleaning Products: We use environmentally safe cleaning products that are effective yet gentle on your surroundings.

Flexible Scheduling: We offer flexible scheduling options to accommodate your busy life or business hours, ensuring minimal disruption.

Affordable Pricing: At Pro Master Cleaners, we offer competitive pricing without compromising on the quality of our work. You’ll get excellent value for your cleaning investment.

Diamond Estate Services: The Premier Choice for Celebrity Estate Services and Sales
At Diamond Estate Services, we specialize in providing top-tier estate services and liquidations, particularly for high-profile clients. Whether you're seeking celebrity estate services, managing celebrity estate sales, or organizing an estate sale for Clint Eastwood, we offer a full range of professional services designed to make your estate sale process seamless, discreet, and profitable.

Celebrity Estate Services: Tailored Solutions for High-Profile Clients
Diamond Estate Services understands that celebrity estate services require a higher level of professionalism, confidentiality, and expertise. We work with celebrities, public figures, and high-net-worth individuals to manage their estates with care and precision. From personal possessions to rare collectibles and valuable assets, we offer a customized approach to meet the specific needs of each client.

Our celebrity estate services include:

Confidentiality and Discretion: We understand the importance of privacy for our high-profile clients. Our team ensures that your estate sale or liquidation is handled with the utmost discretion, keeping your personal information and assets secure.

Valuation and Appraisal: Our experts provide professional appraisals for all types of assets, including fine art, luxury items, collectibles, and antiques, ensuring you receive the highest value for your items.

Customized Solutions: Whether you are downsizing, liquidating an entire estate, or selling specific items, we tailor our services to fit your exact needs, ensuring a smooth and efficient process.

For those who require celebrity estate services, Diamond Estate Services offers unparalleled expertise, professionalism, and discretion.

Celebrity Estate Sales: Discreet, Professional, and Profitable
When it comes to celebrity estate sales, we understand that these sales require a unique level of care and attention. Celebrities often have estates that include high-value items such as rare art collections, vintage cars, designer furniture, jewelry, and other luxury assets. At Diamond Estate Services, we specialize in handling celebrity estate sales, ensuring that your items are sold at their highest value to the right buyers.

Here’s what we offer for celebrity estate sales:

Specialized Marketing: Our team uses tailored marketing strategies to attract the right buyers for your estate. We target affluent buyers, collectors, and specialized markets to ensure that each item is sold for the best possible price.

Professional Handling: Whether it's a high-end item, a personal artifact, or a luxury collection, we handle each piece with the care it deserves. Our team is experienced in managing high-profile estate sales, and we treat every item with respect and professionalism.

Maximized Value: We pride ourselves on achieving the highest sale prices for your items by leveraging our expertise, extensive network of buyers, and marketing strategies to ensure a profitable sale.

If you're planning a celebrity estate sale, Diamond Estate Services is your trusted partner for ensuring a seamless, professional, and profitable experience.

Estate Sale Clint Eastwood: Managing Iconic Estate Liquidations
A Clint Eastwood estate sale is more than just a typical estate liquidation—it's a once-in-a-lifetime opportunity to acquire iconic memorabilia, rare collectibles, and personal treasures from one of the most legendary figures in Hollywood. Diamond Estate Services is well-equipped to handle such high-profile and iconic sales with the discretion and care they require.

For an estate sale for Clint Eastwood, we offer:

Expert Appraisal of Iconic Items: From Eastwood's film memorabilia to his personal collection of art and antiques, we provide expert valuations to ensure that every item is priced correctly.

Specialized Marketing: A Clint Eastwood estate sale requires a tailored approach to attract the right buyers—collectors, film buffs, and luxury buyers who appreciate the value of Eastwood's legacy. Our team uses specialized marketing techniques to bring the right audience to the sale.

Handling High-Profile Sales: As experts in celebrity estate sales, we understand how to handle the logistics of such a sale, ensuring that every aspect—from pricing to post-sale cleanup—is done seamlessly.

If you're handling a Clint Eastwood estate sale or any other high-profile liquidation, Diamond Estate Services provides the expertise and professionalism needed to execute a successful event.