Devon Crawford

I've spent months building a platform to support my development of scalable web applications. In this video, I try to share the learning process.

My personal website has a lot behind the scenes that most people cannot interact with. I've written up a few microservices and decided to deploy them on kubernetes. Some may say that what I've done is overkill - but it really does simplify the workflow once its setup (and I don't have to rewrite my codebase in the future!)

The end result:
- Kubernetes cluster on digital ocean.. 3 nodes, a load balancer, and persistent volume
- nginx-ingress controller exposes services to the outside world (all other services are internal)

Microservices:
- jwt authentication server (security)
- hangfire background processing server
- MySQL database
- mailer
- front end

There is still a lot of work to be done. While most services are scalable - the database is not. Currently, our database is a single instance. I think someday I will need to deploy a MySQL cluster to support replication, etc. This was a massive topic to cover in a single video so I could not explain everything, my hope is that people can take what they see and research further.

Technologies Used:
- CPU Intensive Backend: C# with ASP .NET Core
- Simple I/O Intensive Backend: Node js
- Database: MySQL
- Scheduler: Hangfire open source background processing library
- Authentication: JWT backed by Dotnet Identity
- Mailing Service: Sendgrid
- Integrations: YouTube, Github
- Deployment: Docker images w/ Kubernetes
- Front end: Next js / React

Hangfire (background processing): https://youtu.be/NRiVrZ_8vwA
YouTube Descriptions Updater: https://youtu.be/uKmjvCPllWQ
Next Video: https://youtu.be/l5VtPY7FBw4
Previous Video: https://youtu.be/eDjGBOxuuZs

Social
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Website: https://devoncrawford.io
Twitter: https://twitter.com/DevonCrawford13
Snapchat: https://www.snapchat.com/add/devoncrawfordyt
Instagram: https://www.instagram.com/devoncrawford_/
Github: https://github.com/devoncrawford
Discord: https://discord.gg/sU2fur9
Patreon: https://www.patreon.com/devoncrawford

Gear
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
- Video Editing Software (Premiere Pro CC): https://goo.gl/rKx66D
- All Adobe Apps (I use this plan): https://goo.gl/hrTYFS
- Keyboard (Velocifire TKL01) : https://amzn.to/2AQTjJQ
- Monitors (Dell U2518D) : https://amzn.to/2AQQmco
- Webcam (Logitech C920): https://amzn.to/2Cw588c
- Desk Microphone (Blue Yeti): https://amzn.to/2FPFmzi
- DSLR (Canon T7i): https://amzn.to/2T54mpZ
- Wide Lens (Tokina 11-16mm F2.8): https://amzn.to/2MlpvcO
- Full list of gear: https://devoncrawford.io/gear

Music
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Puar - GEMS W/ sin
Link: https://soundcloud.com/puarbeats/gems-w-sin

bob le head - gapintheclouds [ep] @ 6:52
Link: https://soundcloud.com/bob-le-head/gapintheclouds-ep

dis.joint - knock
Link: https://soundcloud.com/dis-joint/knock-3

A L E X - Easy Track (part of Growing Up, Vol.2)
Link: https://beatsupply.fanlink.to/growingupvol2

Platform for Scalable Web Apps | How I built my website with Kubernetes

In 2019 I wanted to teach myself product development while filming the whole process. It took a lot longer than expected and I burned out pretty hard near the end(2021). 

And yes I was doing it all myself which I now know is not very smart, it's just too much for one person. You really need a team of people to bring a product to market, or at least a few founders. I guess this was more of a learning experience than anything else. I knew I needed to gain experience in commercialization as my normal builds were quite sketchy. So it was good to try and build something solid over long periods. 

These first 5 months included a lot of electrical hardware design(PCBs) and embedded software development. I do want to catch you guys up on everything so I'll be making videos in roughly 5-month chunks between 2019-2022. Until we get more up-to-date, I think it just makes the most sense to post the footage in order.

Next Video:
Previous Video: https://youtu.be/hLjht9uJWgw

Social
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Website: https://devoncrawford.io
Twitter: https://twitter.com/DevonCrawford13
Snapchat: https://www.snapchat.com/add/devoncrawfordyt
Instagram: https://www.instagram.com/devoncrawford_/
Github: https://github.com/devoncrawford
Discord: https://discord.gg/sU2fur9

Gear
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
- Video Editing Software (Premiere Pro CC): https://goo.gl/rKx66D
- Keyboard (Velocifire TKL01) : https://amzn.to/2AQTjJQ
- Webcam (Logitech C920): https://amzn.to/2Cw588c
- Desk Microphone (Blue Yeti): https://amzn.to/2FPFmzi
- DSLR (Canon T7i): https://amzn.to/2T54mpZ

Music
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
A L E X x Kendall Miles - Hollow Moon [FULL EP] @ 17:03
Link: https://soundcloud.com/worsethanthis/a-l-e-x-x-kendall-miles-hollow-moon-full-ep-download-in-desc

けｍ SURF // ₪ JETSON
Link: https://soundcloud.com/highimjetson/m-surf-jetson

Karma Rhythm - snuggle music (beattape) @ 11:16, 13:48, 0:10
Link: https://soundcloud.com/karmarhythm/snuggle

Chill Children - bob le head EP [2018] @ 1:23
Link: https://soundcloud.com/chillchildren/bob-le-head-ep-2018

sin - Starlet @ 0:51
Link: https://soundcloud.com/sinbeatzz/starlet

Mbrr - Lucid
Link: https://soundcloud.com/m-brr/lucid

EMUNE - 100% EMUNE @ 5:45
Link: https://soundcloud.com/emune/e100

GREEN PICCOLO - Juicy
Link: https://soundcloud.com/greenpiccolobeats/juicy

SKUCCI x DVLTEM - THRILL NIGHT
Link: https://soundcloud.com/dvltem/dvlt-x-skucci-thrillnight

Learning Product Development

This is what I'm doing when I'm not posting YouTube videos. For a change I decided to film what I do at school, and show you guys some actual problems that software developers have to solve.

There's not much content on YouTube which actually shows real software dev, usually people just talk and don't really explain what they're doing. I want to take it upon myself to show what actually happens when writing software and if there's enough interest I can make videos as I am programming some new personal projects. On those I can actually show you guys code, and do whatever I want.

FAQ
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What year / major / school?
- Second year computer science at university of guelph

What language?
- Almost everything for my assignments is written in C, I've had one Java course. Personally I know Java the most, then C, some web stuff for my website (HTML, CSS, Javascript, Bootstrap), as well as R for stats courses. Oh and assembly haha that was fun.

How old is u?
- 19

Where u at?
- Canada

Why did u quit ur gaming channel?
- I want to be productive and create cool shit. Been working on many interesting side projects that I usually keep separate from YouTube but thinking about making videos about them. Gaming videos feel like a dead end for me creatively.

When can you post another video?
- When I'm not a slave to the education system (if everyone sent me a nice sum of money I could start my own company and be set, in the meantime subscribe and follow all my social medias will help) 

Can I see some code / what's next??
- ye look at my github (link under socials)

Next Video: https://youtu.be/spwCmFNtMyo
Previous Video: https://youtu.be/em_mlTUoslk

Social
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Website: https://devoncrawford.io
Twitter: https://twitter.com/DevonCrawford13
Snapchat: https://www.snapchat.com/add/devoncrawfordyt
Instagram: https://www.instagram.com/devoncrawford_/
Github: https://github.com/devoncrawford
Discord: https://discord.gg/sU2fur9
Patreon: https://www.patreon.com/devoncrawford

Gear
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
- Video Editing Software (Premiere Pro CC): https://goo.gl/rKx66D
- All Adobe Apps (I use this plan): https://goo.gl/hrTYFS
- Keyboard (Velocifire TKL01) : https://amzn.to/2AQTjJQ
- Monitors (Dell U2518D) : https://amzn.to/2AQQmco
- Webcam (Logitech C920): https://amzn.to/2Cw588c
- Desk Microphone (Blue Yeti): https://amzn.to/2FPFmzi
- DSLR (Canon T7i): https://amzn.to/2T54mpZ
- Wide Lens (Tokina 11-16mm F2.8): https://amzn.to/2MlpvcO
- Full list of gear: https://devoncrawford.io/gear

Music
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
VAGUE003 - drowning
Link: https://soundcloud.com/vague003/drowning

TNGLWD RECORDS - BAD GRAMMAR - Headright (Prod. machinesix & SABII)
Link: https://soundcloud.com/tnglwd/bad-grammar-headright

a l e x - Growing Up, Vol. 1 [preview]
Link: https://soundcloud.com/worsethanthis/growing-up-vol-1-lp

a l e x - double scoop [forthcoming]
Link: https://soundcloud.com/worsethanthis/double-scoop-forthcoming

Day in the Life of a Computer Science Student | UoG

I've wanted to make an LED Music Visualizer for the past year so I finally just did it. I had many problems designing the circuitry and although it is not perfect it actually turned out to be a pretty good result. The coding in this project was simple in comparison to the hardware and although this is not a programming video I want to show people why both hardware and software are interesting especially when you are able to combine them both so that you have full control over the system you designed. Next few videos will be some large software projects I developed in my spare time, meaning I can show you code!! I'm trying to start a community of passionate software/electronics hobbyists and entrepreneurs so join the newly created discord channel if you are interested, I will be active a lot of the time as I just got the app on my phone. 

!! Special shout out to Math Encounters Blog for the amazing Frequency to Voltage Converter circuit !!
Link: http://mathscinotes.com/2014/03/a-simple-frequency-to-voltage-converter/

NEWLY CREATED DISCORD CHANNEL: https://discord.gg/tb6J6F4

Next Video: https://youtu.be/uKmjvCPllWQ
Previous Video: https://youtu.be/S20NcDLF_t4

|| Technologies / parts used ||
RGB LED 300 Pixels (WS2812B): https://goo.gl/YoFYP5
Arduino: https://goo.gl/Ah6GGG

View the code on github: https://github.com/DevonCrawford/LED-Music-Visualizer

Social
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Website: https://devoncrawford.io
Twitter: https://twitter.com/DevonCrawford13
Snapchat: https://www.snapchat.com/add/devoncrawfordyt
Instagram: https://www.instagram.com/devoncrawford_/
Github: https://github.com/devoncrawford
Discord: https://discord.gg/sU2fur9
Patreon: https://www.patreon.com/devoncrawford

Gear
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
- Video Editing Software (Premiere Pro CC): https://goo.gl/rKx66D
- All Adobe Apps (I use this plan): https://goo.gl/hrTYFS
- Keyboard (Velocifire TKL01) : https://amzn.to/2AQTjJQ
- Monitors (Dell U2518D) : https://amzn.to/2AQQmco
- Webcam (Logitech C920): https://amzn.to/2Cw588c
- Desk Microphone (Blue Yeti): https://amzn.to/2FPFmzi
- DSLR (Canon T7i): https://amzn.to/2T54mpZ
- Wide Lens (Tokina 11-16mm F2.8): https://amzn.to/2MlpvcO
- Full list of gear: https://devoncrawford.io/gear

Music
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Karma Rhythm - fruit salad
Link: https://soundcloud.com/karmarhythm/fruit-salad

Complexion - The Future Beats Show 173 Featuring Funk Bast*rd
Link: https://soundcloud.com/complexion/the-future-beats-show-173-featuring-funk-bastrd

DIY LED Music Visualizer | Real-Time Animations (Arduino)

Since you guys really liked the last computer science video I decided to talk about my hardest CS course, nicknamed the "angel of death" at my school. It has a notoriously high fail rate for its assignments. You can expect to write a few thousand lines of C code in the first two assignments. This year we made a GEDCOM parser (which is actually what ancestry.com uses) to store information about family histories, allowing us to perform operations on family connections. In the second assignment we wrote a GEDCOM file writer, to create a GEDCOM file out of the memory objects. In the third assignment we used Node js and express to create a RESTful web server and UI for interacting with our parser. I tried to explain the file structure as best I could in a few minutes, so it will probably be very confusing to watch at first. The goal is to show you the complexities of the file structure, and how we built this web application to interface with our C API. This is basically how large scale cloud computing applications are made such as YouTube and Facebook.

GEDCOM Standard: https://edge.fscdn.org/assets/img/documents/ged551-86e5da89bae6ec7ba6f10e6794275d7e.pdf

The point I want to make is that this course is not as "hard" as everybody makes it out to be. Just dedicate at least two weeks to the assignment and you will be fine. None of the algorithms or data structures were difficult, rather it was the massive amount of errors possible when writing such a parser from scratch. There are thousands of tags and conditions if you want to create a full parser and identify everything listed in the standard. Thankfully we only implemented about half of the full parser seen on the standard (link above).

|| Technologies used ||

GEDCOM Parser API:
- C

Web server:
- Node js with express framework
- RESTful server, ajax, JSON
- JavaScript

Client:
- HTML, CSS, JavaScript, Bootstrap

Next Video: https://youtu.be/lU1GVVU9gLU
Previous Video: https://youtu.be/spwCmFNtMyo

Social
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Website: https://devoncrawford.io
Twitter: https://twitter.com/DevonCrawford13
Snapchat: https://www.snapchat.com/add/devoncrawfordyt
Instagram: https://www.instagram.com/devoncrawford_/
Github: https://github.com/devoncrawford
Discord: https://discord.gg/sU2fur9
Patreon: https://www.patreon.com/devoncrawford

Gear
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
- Video Editing Software (Premiere Pro CC): https://goo.gl/rKx66D
- All Adobe Apps (I use this plan): https://goo.gl/hrTYFS
- Keyboard (Velocifire TKL01) : https://amzn.to/2AQTjJQ
- Monitors (Dell U2518D) : https://amzn.to/2AQQmco
- Webcam (Logitech C920): https://amzn.to/2Cw588c
- Desk Microphone (Blue Yeti): https://amzn.to/2FPFmzi
- DSLR (Canon T7i): https://amzn.to/2T54mpZ
- Wide Lens (Tokina 11-16mm F2.8): https://amzn.to/2MlpvcO
- Full list of gear: https://devoncrawford.io/gear

Music
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
lzr - ride (ft. NIGHT GRIND)
Link: https://soundcloud.com/prodlzr/ride-ft-night-grind

cresce - Top Down ft. AUFL (produced by Cresce & Haelen)
Link: https://soundcloud.com/crescecknd/top-down-ft-aufl-produced-by-cresce-haelen

lux natura - gravity well
Link: https://soundcloud.com/luxnatura/gravity-well

Late June - Balcony [ep/tape]
Link: https://soundcloud.com/latejune/balcony

Late June - You & I
Link: https://soundcloud.com/latejune/you-i

Hardest Computer Science Course Explained | Angel of Death UoG

This is the most asked question on my channel by far so I thought I'd explain how I learned programming. In the process I got a little distracted and accidentally explained all of computer science in 8 minutes (kind of). 

The goal of this video was to show you the connections between modern day (high-level) programming and how it was implemented at the low level. I show you the basics in Java and convert it to C code, then into Assembly, which leads me to talk about how computers perform addition/subtraction, and the logic design behind that is all implemented with transistors. In case you couldn't tell, I love low level programming. Just a disclaimer that I'm not saying this is the best way to learn programming I am simply sharing what I feel was the most valuable in my learning so far. I know many people start with web technologies which can be a great introduction as well! I am currently teaching myself a lot of server networking & all that stuff. I just believe if you really want to understand how to design algorithms and solve problems in creative ways then the most valuable things you can learn are at the low level. Even though C is 40 years old it is still regarded as producing the most efficient code since you have full control over pointers and memory management with minimal overhead. (the only thing faster is assembly.. an even lower level)

Technical Resources!!
C Programming Language, 2nd Edition (Awesome Book): https://amzn.to/2LDeFOr
Easy68K (Assembly Simulator): http://www.easy68k.com/
Hexadecimal to Binary Conversions: https://www.rapidtables.com/convert/number/hex-dec-bin-converter.html
Two's Complement (Binary Addition/Subtraction): https://en.wikipedia.org/wiki/Two%27s_complement

Next Video:
Previous Video:

Social
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Website: https://devoncrawford.io
Twitter: https://twitter.com/DevonCrawford13
Snapchat: https://www.snapchat.com/add/devoncrawfordyt
Instagram: https://www.instagram.com/devoncrawford_/
Github: https://github.com/devoncrawford
Discord: https://discord.gg/sU2fur9
Patreon: https://www.patreon.com/devoncrawford

Gear
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
- Video Editing Software (Premiere Pro CC): https://goo.gl/rKx66D
- All Adobe Apps (I use this plan): https://goo.gl/hrTYFS
- Keyboard (Velocifire TKL01) : https://amzn.to/2AQTjJQ
- Monitors (Dell U2518D) : https://amzn.to/2AQQmco
- Webcam (Logitech C920): https://amzn.to/2Cw588c
- Desk Microphone (Blue Yeti): https://amzn.to/2FPFmzi
- DSLR (Canon T7i): https://amzn.to/2T54mpZ
- Wide Lens (Tokina 11-16mm F2.8): https://amzn.to/2MlpvcO
- Full list of gear: https://devoncrawford.io/gear

Music
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
emo the optimist - fading light
Link: https://soundcloud.com/emotheoptimist/fading-light-2

shortfatty - distant
Link: https://soundcloud.com/shortfatty/distant

a l e x - This Week
Link: https://beatsupply.fanlink.to/growingupvol2

Weaver Beats² - TRAPPIN IN ＨＯＮＯＬＵＬＵ⁴
Link: https://soundcloud.com/weaverbeats2/trappin-4

a l e x - Soul Will Mess With Me
Link: https://beatsupply.fanlink.to/growingupvol2

a l e x - Peppy Won't Fly Straight and Its Getting on My Nerves
Link: https://beatsupply.fanlink.to/growingupvol2

3 years of Computer Science in 8 minutes

Here's my naive attempt at building a motion detection algorithm that edits my videos.

AlgoExpert (30% off): https://www.algoexpert.io/devon

Thanks to AlgoExpert for sponsoring this video. Practice your technical interview skills and land your dream job (while supporting my channel!)

This is my first time doing image/video processing pixel by pixel. I'm sure motion/difference algorithms like this already exist but I figured it would be a great learning experience to implement one myself and integrate it with my video editing automation. So far this project does not use any machine learning or AI. There's still a lot we can do without it (and it might even be more efficient!). This is the second video in what may turn into a series. The core video automation functionality is built on top of FFmpeg and was built up in the last video. Now we can start designing more intelligent algorithms that edit videos for us :))

If you have no idea what's going on watch my last video: https://youtu.be/0ZeO0IQaJ-A

If you still have no idea what's going on, comment "I have no idea what's going on".

Thanks,
Devon

Social
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Website: https://devoncrawford.io
Twitter: https://twitter.com/DevonCrawford13
Snapchat: https://www.snapchat.com/add/devoncrawfordyt
Instagram: https://www.instagram.com/devoncrawford_/
Github: https://github.com/devoncrawford
Discord: https://discord.gg/sU2fur9
Patreon: https://www.patreon.com/devoncrawford

Music
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
e e v e e - lost found [2QQ3] *Rare*
Link: https://soundcloud.com/eveline-eevee/lost-found-2001-rare

kloudbug - M&M's FOR BREAKFAST w/ Inteus
Link: https://soundcloud.com/kloudbug/mms-for-breakfast-w-inteus

crime tech. - GELATO
Link: https://soundcloud.com/crime-tech/gelato

uncomfy - awake.
Link: https://soundcloud.com/case-spat/awake-2

Motion Detection Algorithm Edits my Videos

Took a look at my private data and found some pretty weird stuff.. possible security vulnerability with Google Photos, third-party data from eBay and Amazon as well as audio recordings from "Ok, Google". 

These are just my personal findings and I cannot claim this happens for everyone. Luckily most people watching this video have a YouTube account and therefore a Google account. You can all download your own data and look for what I found in this video, I didn't even have to do any heavy digging, its all pretty much out in the open once you throw stuff into your text editor. This content is not intended to harm any entity or person but rather share some concerns with the current state of data privacy on large websites such as Google.

Next Video:
Previous Video: https://youtu.be/tyiwliH64Mg

Vito: https://twitter.com/VitoGiovannetti

Social
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Website: https://devoncrawford.io
Twitter: https://twitter.com/DevonCrawford13
Snapchat: https://www.snapchat.com/add/devoncrawfordyt
Instagram: https://www.instagram.com/devoncrawford_/
Github: https://github.com/devoncrawford
Discord: https://discord.gg/sU2fur9

Gear
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
https://devoncrawford.io/gear

Music
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Loukeman - Bet We Won't
Link: https://soundcloud.com/loukeman/bet-we-wont

STVSHBOI - FLASHING LIGHTS w/ TRAPGUNS ☁️
Link: https://soundcloud.com/stvshboi/flashing-lights-w-trapguns

SwuM - DOOM
Link: https://soundcloud.com/swumbeats/doom

KASPA. - Not long now
Link: https://soundcloud.com/kaspamusic/not-long-now

Sappy - NINE TO YO DOME
Link: https://soundcloud.com/sappy94/nine-to-yo-dome

motat - PULL UP
Link: https://soundcloud.com/motatnz/pull-up