# 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.

Over the past 2 months I have interviewed with several companies and 2 of them stood out at rejecting me. Let's call them Company A, and Company B!

> I know right? Developers are bad at naming!

I guess part of it is my fault too! I am old and slow. Doesn't like competitive programming and already forgot most of how to answer algorithm question. I can't even answer some of the algorithm question I've flawlessly answered back when I was fresh out of University.

## Company A

When I got chance to interview at Company A, they require me to answer HackerRank style interview. It's my first time in nearly a decade of working in the industry to feel like I'm in a classroom exam again. I hate it, and I deliberately voiced my distaste to the answers comment:

// Paraphrasing
// I'm sorry, I'm dumb!
// I never faced anything like this in real world work...
// ......

But guess what? My answer still pass the score, have a call with their VP, which proceed to have another call with their Lead Engineer.

Talked about my experience with Event Driven System and CQRS+ES and they decided that I am:
- Arrogant
- Too RND in my tech stack
- And overkill in CQRS+ES

And decided they don't need me.
They hate me for having a headstrong personality which translates as Arrogance to the perceiving end.

## Company B

Another HackerRank style interview. Guess I passed their score this time without me typing some strong comment and proceed to have another test with their Lead Engineer.
This time they want 5 question answered in google docs within 60 minutes.
Two of them stood out to me for being impossible to work on 12 minutes (60 / 5 if you're wondering). Or maybe I'm just old and dumb?!
The others are just questions copied word for word from Geeks For Geeks.

One of the question requires me to write a password brute force attack to an imaginary API.

The other requires me to find a combination of math `+` or `-` operation from `a strings of numbers` that results in `a number`.

My `Arrogance` kicks in and I start typing a comment

// Paraphrasing
// I am sorry but I feel this is impossible for me to think of in 12 minutes
// (60 / 5 if you're wondering)
// But I know you guys got this question from Rosseta Code!
// Here's the link, but I don't know the logic behind it

See? I've worked on this question back when I was still a University student and remember where to look at.

Unsurprisingly, I've heard the feedback that I was rejected although I've answered one of their question `FLAWLESSLY`. I know they are being sarcastic at this point. haha.

---

I was trying to be honest about what I can and can't do in the `N` minutes timeframe and the Industry hates me.

I guess The Industry love people who can grind `GFG` or other algorithm websites, remember the solutions out of their head, and quietly answer their `genuinely original question` without pointing the flaws back at them.