Data Structures And Algorithms Q&A and Videos

I recently got laid off working as a developer working within an agency. I currently have around 5 years of experience working in the agency setting utilizing React, Next js, Vue, Liquid, and the Shopify API to create custom eCommerce sites. During my time at these agencies, I also had the opportunity to act as a lead, interact with clients, set timelines, and cross collaborate with designers/projects managers to meet deadlines.

I have been looking for new opportunities since January and I've been able to secure a couple of interviews, technical challenges, and one onsite. Most of my interviews have been coming from agencies, but my preference is to join a tech startup or maybe more on the brand side of things within the Shopify niche. Below are a couple of questions:

1. Will working at another agency hurt my career in the long run? My ultimate end goal is to work for a bigger tech company if possible.
2. If an agency does want to hire me right now, should I take the job for now or just wait for one of my preferences?
3. I notice a lot of developers within the agency space freelance after their 9-5. Does studying for interviews or future jobs provide a higher ROI instead of freelancing?
4. Lastly, I just finished (super helpful!). It seems like the best course of action for me is to apply a lot, work on side projects instead of grinding leetcode, and study system design. Does this seem correct?

Thanks in advance!

Have my first interview coming up with a big tech company and want to do some leetcode-prep to get my problem-solving muscles warm before the interview. I've gone on Glassdoor and seen some of the questions people have posted that they’ve gotten from the company in the past year. Should I practice these questions? The obvious answer would be “yes, you’d be crazy not to!”, but I can think of 3 reasons not to:

1. if I am asked if I have seen the question before, many people advocate answering truthfully, in which case, I kind of negate the advantage of studying-company specific questions. There are actually 2 reasons people have for telling the interviewer you've seen a question. One, because they want to know. This is the principle-based reason. Two, because they can tell if you're pretending not to have seen it. This is the pragmatic reason for disclosing that you've seen the question.

2. there’s an argument to be made against studying for any one-specific company and instead beefing up my DS&A skills in general – this would argue for studying questions that are the most common across all (big tech) interviews, not specific to the one I’m interviewing with.

3. This company is very big, and Glassdoor combines questions from multiple teams and departments. The chance that I'll see a question from the team I'm interviewing with is small.

Thanks!

I've a Meta technical phone screen coming next week. I've a good grip on programming patterns but I've been dealing with toxic work culture and hence couldn't focus on preparation so much lately. Any valuable inputs on what should I focus on for the technical screen while I brush up on the patterns would be of great help. Thanks.

I am a self-taught frontend developer with almost 2 years' experience working for an outsourcing company.

During an interview recently, the interviewer said that I had good communication skills and should focus on technical topics.

My stack consists of JavaScript/Typescript, React, and I know a little bit about Python and Django. Typescript is mostly what I use.

Here's my questions:

• Is there a specific approach you recommend I take to this technical part?
• Do I need to learn more data structures and algorithms since I do not have a Computer Science degree?
• In order to build a strong foundation, should I consider applying to a FAANG company?

Your comments will be greatly appreciated!

Thank you so much!

Under what circumstances is a candidate typically down-leveled after the onsite interviews at Meta? The interview was for an E5 SWE role. The recruiter mentioned that the coding interview was not at E5 level (this was even after acing both the medium level coding questions with the correct Time & Space complexities). I am looking for guidance on what could be the reason here. Also, the feedback for the System Design and Behavioral rounds were good. Thanks in advance!

I was recently approached by a recruiter to interview for Bytedance, Singapore.

My DSA skills are rusty, not having interviewed in over a year. The primary language I use at work is Golang, but I do not think its good for DSA interview rounds as it has limited in built data structures. Earlier I have given interviews in Java but I have not touched it in a year.

Given I have 3 weeks to prepare for the DSA Coding rounds, should I consider learning Python as I have "heard" that its the preferred language and faster to use in coding interviews?

Given I have to ramp up on my leetcode and learn python, I feel this might be setting myself up for failure. Would like suggestions on how to think about this.

I work at a startup hiring senior software engineers. I have less than 1 year experience but I was asked to take technical interviews. I explained that they have wide skill set and I might not be the best person to interview them. They told me it's not a problem and that I can ask them questions related to what I already know.

So I interviewed a PayPal software engineer today and he has 6 years of experience. I've asked JS/TS specific questions like "here's a sample code, tell me what's wrong with it?" and I noticed that the candidate couldn't answer these questions. He started to get defensive and said that I shouldn't be asking these type of intricate questions given that it's easy to resolve the problematic code by relying on code editors' intelligence or simply googling the bug. In the end, we gave him a DSA question which he solved in 15 min.

I want to hear opinions of engineers here because I was expecting a senior engineer to know the "gotchas" of languages they have experience with and not just be good at DSA. I know it's important to have confidence in interviews, but is it okay to straight-up tell the interviewer to not ask language specific questions? Is asking language specific questions not the right way to evaluate someone's knowledge?

I use Typescript for work and in the past I used C++ exclusively for coding interviews, but now I feel I can use Typescript itself for interviews. What do all use and has anyone given a coding round using Typescript? It would be great if you highlight the pros and cons as well.

I haven't touched leetcode yet and don't have a CS background. I'm not sure whether to use my free time to work on a personal project or if I should use the time to take up a DS & Algos udemy course, Algoexpert, etc and just leetcode until I can apply for the big G. I guess where I stand with that is I'm wondering if there is more value in it than a skill that just vaporizes after passing the leetcode interviews.

My bottle neck is debugging when you can't run code. When practicing I am able to run code and add prints and trace the code. But often in a real interview you have to debug through pure reasoning which is hard

My performance is getting hit because in DSA I often get an answer 95% correct but the interviewer tells me I have a bug and I find it really really hard to trace the bug especially in recursion problems

Just curious about opinions here. My main language is JavaScript, and I know people probably assume I am a front-end developer / full-stack (reasonable biases). In reality, I've been primarily backend for several years now. Throughout my experience at Microsoft and Twitch, I've used a fair amount of Node.JS / vanilla JS, then a bit more TypeScript for the CDK constructs we all know at Twitch (our team was primarily responsible for building and debugging Amazon Builder Tools things). I've done the majority of my interviews in JavaScript and it has been mostly OK, since I've used it for so long, but just wondering if it matters.

I used to do my interviews in C++, but then I got burned during a Google interview when my interviewer talked about the inefficiencies of emplace_back vs push_back (I had no idea). After that point, I just decided to do JS because I was reasonably proficient at it, and it is actually faster to write than C++ in a lot of cases (less boilerplate).

The top LeetCode answers / YouTube explanations and such are usually in Java or Python, so sometimes it's also hard to find a good JS answer. I'm leaning towards Python, because it is more like JS and with less boiler-plate like Java, but I'm worried about something throwing out some random trivia about Python that I have no idea about, because honestly I haven't used it much in my career thus far.

I am proficient in JavaScript, moderate in Java and Beginner in Python. If I have around 2-3 months  to prepare what would you suggest I go for?

What are the factors to consider when selecting the language?
In built data structures and proficiency or are there other factors to consider?

I’m a Data Engineer at a slow-moving finance company who’s looking for my next job in Big Tech. I just had a recruiter from Stripe reach out about scheduling an interview, which happened because I had a buddy who works at stripe refer me to the role. The position is for backend engineer.

The recruiter says the call will be 20 minutes and I should come prepared with “the most technically complex project” I’ve worked on, and talk about my role, duration, number of engineers, and stakeholders.

I’m nervous about this because my current role is something of a hybrid between data engineer and data analyst and I do a fair bit of data-analyst type work. It’s not that I don’t have projects I can talk about, it’s just that I’m insecure about them and I feel like they are unimpressive to a ‘real’ software engineer and this becomes apparent under sustained scrutiny. So maybe I can get by the 20 minute intro call, but there will surely be an hour-long session later where they want to go into excruciating detail. I do have some experience with backend as well, but it’s already almost 3 years ago now.

My question is this: how can I go about improving my situation? I’m applying for entry-level roles (IC1) and was under the naïve assumption that I just had to get very good at DSA/Leetcode. Obviously, this is not the case.

In order to better handle these project walkthroughs going forward, I see a number of potential approaches, which are not necessarily mutually exclusive:

1. Get better at discussing projects in my current toolkit. Ditch the imposter syndrome and spend more time thinking about what I already have.
2. Invest more in my current job to create better projects with ‘scope’ that are more impressive in interview rounds. Right now, I’m not very committed to my work and coast, doing whatever is assigned to me but in a minimalist way. My current manager has told me how he wants me to be more active in getting things done and taking on a larger role, but as a Tier-3 company, there is no expectation or requirement for me to do so (i.e. very low chance of me being let go), and furthermore, I tell myself I will be leaving soon, so why take on more responsibility? This might ironically contribute to it being harder for me to move since I don’t do the kinds of things that make it easier to interview.
3. Do side-projects outside of work that I can discuss. But here I run into the issue that I’m not working with anyone (unless it’s open source) and this is probably not the best approach unless my side-project is really good with users. I’ve heard Alex and Rahul say this a number of times.

Happy to hear anyone’s thoughts about how I can improve my situation. I probably have the wrong attitude towards my current role, as I’ve been wanting to leave it for over a year. I’ve thought about quitting a lot so I can have more time for interviewing, side-projects, networking, learning, and prep, but everyone says that’s a bad idea (especially in the current climate), so it’s easier to just muddle on in my current role.

Thoughts are welcome!

I kind of unexpectedly got a new grad swe interview at Meta. I know there are already discussions on Taro about Meta interview, but I wanted to seek advice on my specific situation.

I am sort of new to Leetcode. I mostly interned at startups before so LC wasn't the focus (ik I still should have done LC - my bad). So here are few questions I have:

1. How much can I delay the interview? I am thinking doing it with 4 week breaks - the first round after 4 weeks from today, next round after another 4 weeks, and so on. Is that ok?

2. How many hours should i dedicate per day to leetcode, to get good at it FAST? Asking because I am also a full-time student so I am willing to sacrifice my grades if it requires putting more time into leetcode.

3. What are the HIGHEST bang for buck activities I can do? Time is extremely limited so I want to make sure I am spending it right.

FYI - I do have access to algomonster () - I am thinking of doing my LC prep there cause it's pattern based + has AI coach.

I would really appreciate some advice here. Have never interviewed for a FAANG so this opportunity means a lot. Thanks!!

(Also if you know of good resources, suggest them too! I am willing to invest in resources/mentors.)

What I've noticed is that FAANG companies don't seem to look beyond Data Structure and Algorithms (DSA) or system design in interviews, whereas medium-sized companies also consider other skills. For example, for a Python web framework, they might look at Django, Flask, or FAST. For a data engineer role, Apache Airflow might be important. ATS may not even pickup your resume unless they see very specific word like Django or Apache Airflow in your resume. It seems like it might be easier to prepare for big tech companies since they focus only on DSA, System Design, and behavioral rounds. In contrast, other companies look for such a wide range of skills that it's hard to master and work on all of them.

Let me know your views.

Am interested in some self paced online courses I can take from home, and one that ideally lead to some sort of certificate/badge/credential. Free resources would be best, but am willing to pay a few dollars for top quality.

Something like leetcode would be too advanced for me. I am familiar with programming but never formally learned it and have 0 knowledge of these topics.

Hello!

So, my job's getting outsourced this summer, and I'm deep into figuring out my game plan for interviews. I'm mostly a frontend engineer, working with Angular, SCSS, and ngRX for our app. I've dabbled in backend too, even went full-stack in my team, but my backend skills aren't great. My manager supports me marketing myself as a full stack person, but I'm wondering if going all-in on full stack jobs is worth the effort during the interview prep, especially since I'm not a big fan of backend work.

Then I wonder if the downside of applying for frontend jobs is that there are not that many and the barrier for frontend is lower (maybe because of coding bootcamps and it can be self-learned) so competition will be higher.

Now, I'm drowning in prep work - data structures, algorithms, frontend know-how, and system design. Recently got hit with a surprise system design coding round in an interview (an internal position I arrogantly thought I had in the bag) I thought was all about frontend and DSA. Did okay, but not stellar, and now I'm feeling unprepared for every interview. I feel crippled to even apply to positions. It's a bit of a mess.

So questions:

1. Any tips on tackling system design questions, especially the coding part? Most online resources seem to focus more on design rather than coding specifics.
2. How should I balance DSA, system design, frontend prep? What topics and how much time should I commit to each of them?
3. Also, am I on the right track leaning towards applying for just frontend roles?

Appreciate any & all feedback!!