Unity3D GameDev Interview Questions 

Baby Yoda & the Crazy HammerBot stole my focus... :)

I just got an interview and these are the questions I was asked: - what things to consider while working with canvas? - what is async/await? how is it different from coroutines? - what is Dipendency Injection? Give an example of DI usage. - give an example of S and O usage from SOLID in Unity. - what is assembly definition and how to use it? - how to use git. - how to optimize sprites? how to optimize particles? This looks like general knowledge that every jun to middle dev should know.

Congrats on the 100k subscribers mate, well deserved for sure :) Been great watching your content and seeing how its evolved over time.

Congrats for your 100k subscribers. I've been watching you for a while now, and think you absolutly deserve it! Keep up the great work

Another quality video thanks! I've learned so much from these recently - far more than from any other Unity videos online.

Man, I'm going to my first interview tomorrow, your video is just on time!

I swear, a month ago you looked on the verge of retirement, and possibly buying a time share in a beige motorhome . . Today, you look like a man thats prepared to drop a bomb on the dance floor and show those cross town boys that daddy's in home! Either way, top class Tut as always! Thanks for sharing Jason 👌👍🏼

Thanks for the new Video, Jason! Love your videos. I look forward to new developments from you.

Jason is really good at what he does, I love it, thank you J!

Great video as always Jason! I started watching your videos about 4 months ago, when I decided to pursue my passion and you've been helpful ever since. Can't wait for the "How to make a game 2020" tutorial, keep up the good work sir!

Excited to see the new game tutorial for Unity 2020! So many things have changed and the other 3 hour 'mad birds' was an absolute gem!

Cool. Congrats with the 100K subs Jason! 👍🤓🧡

Hey Jason, in your video you've asked for some recommendations so from my side, I'd love you to make more content on DOTS please :) You're an amazing teacher and seeing you covering the subject would be great.

Congrats on 100k 🥳

Congrats for the 100k subs!

Great vid, json, I'd like to add some math ones that I've ran into a lot: How to find the direction vector from point A to point B? What is the dot product and the cross product? Give me some examples of them in games. When should you normalize a vector? How to find the angle between two vectors? How to determine if two circles are intersecting? And some optimization patterns: Data locality, Spatial Partition, Object Pooling. Pretty much the ones from the gameprogrammingpatterns book. You don't have to memorize them, but the one optimization topic that kept popping up is something like - there's a million spheres moving around and is hurting performance, what kind of optimization techniques would you do to help it perform better? I remember you put out a similar video like this last year and motivated me to start applying and going through that painful process of applying. I still keep getting denied but still trying! Hope this might help someone. Thanks again, json.

Congrats on 100K subs!

Thanks man! You saved me a lot, well my Player was not give a good feedback in the keyboard, I've change the Fixed Timestep to 0.01 giving an 100 frames per second, now it looks smooth and it 's very responsive! Great!

This is a really helpful video🔥 thanks Jason ❤️

Congrats 100K!

Congrats on 100k

Having been on a lot tech interviews and having given a lot, you mentioned one of the key things you should do for almost any question, and that's get more context. I've spoken with so many other interviewers and trainers who will deliberately ask a super vague question that cannot be answered correctly without the candidate asking clarifying questions. And even if the question is straightforward, what's really impressive is if you give several examples in different contexts.

100k! Well done!

Super excited for the "make a game" video, been going through the angry birds clone and wanting something different. Thanks for the content!

So many questions were there which Jason solved for me.....I love it😃😃😄

Thanks, Jason! Still relevant in 2024!

very useful information, one of best video for unity interview questions

I love the office setup. THanks for the video.

You r doing great job👍👍👍

very well explained in detail

I'm a bit late but congrats for 100k subs man!

Very Informative this kind of video is very helpful thanks so much

Another way to describe coroutines that I think explains how they work a little more: The single thread is passed from coroutine to coroutine amongst all active game objects in the scene, and the thread executes each coroutine up until the next yield statement. Then, the thread is passed to the next coroutine, etc. And it loops back around until all logic in all coroutines that need to be handled in any given frame have their logic executed. In doing so, each object has its behaviors expressed in an order that the human eye perceives them all happening at the exact same moment. So it tricks the human eye into thinking this is all asynchronous.

Thank you for the information.

Pretty helpful. I think I got asked that update/fixedupdate question in my only unity/gamedev interview ever (so far, #2 in 1.5 hours, hopefully I have better luck this time).

Jason i think you should get your youtube channel verified, it will attract more people, and i love the way you teach, cheers

You are my HERO.

I've been trying to get a Unity job for a while and so far I don't remember ever getting any Unity related questions during interviews . At least not in terms of the examples given in this video. Usually they're more general , if they even happen at all. I haven't had that many interviews for Unity positions, but from my experience they usually go 2~3 ways: - go over your background and maybe your Unity experience in general (personal projects only in my case) followed by a test - go straight into a Test without even bothering to have a call before it With the tests being the important part. Since I'm applying for a programmer position, usually the tests are mainly about writing good / clean code (sticking to SOLID and some patterns) and showing that you know your Unity stuff (like the things mentioned in this video). The tests usually end up being about making some kind of simple game or clone of an existing one., mainly just to get some code down that the company can check out (unless you already have some code you can share, I guess) Though it also seems to depend a bit on the type of games the company makes. Mobile game companies usually seem to focus just on code quality and knowledge, while the companies that work on PC / console games seem to be more interested in more technical / mathematical knowledge that are relevant to the games they make, rather than just being able to write good code.

Nice vid Jason! :D Just a little correction: in C# the % operator is the remainder operator, not the mod operator. The difference is slight, but for instance -1 % 10 will return -1, not 9 as you would expect from the mod operator.

I really like your videos. dont stop the greate work. As an intermediate dev i would like to see a video focused on architecture. e.g. scenemanagment and gameplay flow because every video i see out there everything is tightly coupled

The question we always ask at my work is "what are singletons, and why would you use/not use them vs similar methods?"

Thanks Jason.

Jason I wanted to let you know that I consider you my mentor in game development (programming side) I learned a lot of concepts from you on how to think about Architecture and yet again I learned something new, the Json Serialization will make my saving logic more tidy and efficient

latest game developer interview tip : ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ITUpuKbDNSk.html

Would love to see the Office Tour video.

It's also important not to just give an answer, but also show them ur thinking process. Just say everything you have in mind, like "If I do this, this will happen, so It'll break the system. But if I do this..."

Congrats on 100k. Have you decided what game you will fully make. Can I suggest something with tilemap please, and finite state machine AI

A question I was recently asked is what is the order of calls that happen when a game starts to when it ends. So example is its OnAwake()->OnEnable()-> Update()...ect.

i really like your content, maybe u can make a Video about level Design and some tips do use texture , prefabs etc. would be really nice do see how u would do start Level Design especially preparation :)

Hi Jason! I would to to see a video where you do a quick postmortem of the commercial games you worked on. Thank you, have a nice day!

Thank you!!!

I was asked about the difference between Start and Awake, and the difference between Update and LateUpdate

FixedUpdate vs. Update leads me to this random semi-related comment: The convention about the game-programming community that so much should happen within update loops in general is something that always struck me as bad software engineering. Input should just not happen in update. Repeatedly querying boolean values in a loop is simply an ugly practize. An input event is an event. Handlers should be attached to events. The idea that a key-down variable is true for the duration of one frame - its a bad one. Also I like the async-await syntax better than coroutines. coroutines are basically a syntactic hack, to use the power of enumerators to do the context-switching. from a language point of view, its clear that Tasks were really designed for this.

Hi Jason, cheers for all your videos. As a web developer looking at game developer as a possible career move, are you able to please go over what a typical day looks like as a game dev in a team? I would imagine as an Indie dev you would spend most of your time designing your game in terms of what objects look like, how they move etc and much less of your time on the scripts. How does this compare to working in a team with game designers, 3d modellers etc.

Your my replacement for Brackeys

Okay so for fixedUpdate vs Update, both are just loops but for fixedUpdate it runs at a fixed time at every 0.02 seconds (default) and you want to do physics things like add a force every standard amount of time and also so that you dont add it more frequently in the Update method. The Update method loops quicker usually

cool i like your content

nice Tupac Shakur reference in the background ;)

1/timestep = fps. Storing that in my formula database for damn sure.

Hi 👋🏼 can you elaborate more about coroutines? Maybe with examples, when we should use them and more importantly when we shouldn’t use them

I had a series of interviews last week. Design patterns and SOLID principles were a big chunk of these. But I was interviewed for a senior position so... Idouno how much to know these for junior positions is relevant but in my country DP are always asked no matter the level of the position.

that's fuckin it??? im definitely applying

What is your opinion on using Scriptable objects as a replacement of singletons?

can you make video about what is a "good for me"(i mean you ofc) system to build, like you did with kids game. Like a simple quest system. would greatly helpfull

Great Video Jason. Have one question though, @22:18, Is it possible to store image/sprite in WritePlayerDataWithJson() ?

Unity documentation says FixedUpdate is frame-independent. Always. If game fps drops below, it shouldn't affect fixedUpdate call frequency. Am I wrong? For example Thread.Sleep(50) in Update make my scene to run slower and I get from 2 to 4 fixedUpdate calls each frame.

Tour would be nice,.

Hey Jason, have you come across the UNITY DISTRIBUTION PORTAL? It puts your games on sites like SAMSUNG, HUAWEI, etc, without you doing it for each site. I'm having trouble uploading my game it crashes..ANY chance you'll do a video on it

can you explain about unity mobile game development? i was asking this for a long time. I am also using your website.

i less or equal to _max otherwise it just goes to 99 :) Last print should be Buzz (100).

Is there any way we can practice coding specifically related to unity? If there is any helping material or website kindly do let me know

Hello Jason, for about 4 days I see blue circle that indicates that you uploaded new video, but nothing new. After I visit your channel page circle done, but in few hours appears again.

From version 3.0 to version 4.5 of Unity is it possible to use only the 2012 version of Visual Studio professional ?

Pls show is a tutorial on how we can receive payment from Unity

Hello Gamedev.tv, could you help me pfv ? in my project has a ball with an arrow directional, as I do for the Ball shoot only in the direction that the "tip" of the arrow is aiming please. i put a gameobject with collisor on tip ^^,

What do you know about coroutines? I don't like them I prefer Task

since you asked about other videos to make, and I heard in another one of your videos that you aren't much of an artist....how do you deal with that? As a solo developer, what's your process on getting your games completed if you aren't much of an artist?

Have you ever met a god game dev who learned by himself with online courses? I started to learn C# last week, of course I know nothing but I've seen a couple interview videos and pages and I got to say all of them scared me af. Hell, I don't even know if I'll like programming, so I might find out I don't and be done with it, but even if I do end up liking it idk, seems too much more than I could learn from online courses tbh.

Bro try fixed game Dark Nemesis please

I got asked about linked lists and matrices in an interview and apparently didn't get the job because I don't use them? Are they really that important in Unity or something that would be integral to be working with Unity?

1 week ago

Thats why i love internet, includes a lot of information and bikini videos

Json

Why did you came back to Visual studio from Rider???

First of all sorry for my bad english , I'm living in Turkey. I am a student of Mehmet Akif Ersoy University CTIS department. I want to do an internship abroad. That's why i am still learning english. Do you think it is impossible ?

Oh if only Fizzbuzz was asked and not crazy LC problems

4:12 this is not correct. The FixedUpdate rate can easily be higher than game's framerate. It will stack multiple calls in between Updates simulating higher rate.

I thought PlayerPrefs were stored in the Windows registry.....this seems a bit rude to our players to use. Or is that just me?

I think you can make fizz buzz more better with a variable and 2 if and a debug. string a = ""; for (int i = 1; i

Hall

Number

Hallo

Don't quite like the new content. I started following like 3 years back when it was all about game arquitecture and programming patterns. Now that I have 3 extra years of experience it's all about suuuuuper basic stuff :(

Seek Jesus Christ, he will open your eyes to the truth. He is real