Top 50 Slack Interview Questions & Answer

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Slack interview questions and answers

Table of Contents

1) A huge part of our business here at Slack is designing software for iOS. In this role, how would you steer away from retain cycles when using closures in Swift programming language?

This question allows your interviewer to assess your technical knowledge and skills in designing apps for iOS products in a very simple way. To successfully answer it, make sure that you can speak knowledgeably about the swift programming language and using closures to capture and store references within the software. To piece together everything for your interviewer, give a clear understanding of why retain cycles must be avoided in your processing.

2) If hired here at Slack to develop iOS and Android software, when would you use a fragment rather than an activity?

In the development of apps for both iOS and Android, using code to create an activity versus a fragment is a highly debated topic to this day. For this question, your interviewer is looking to hear that you understand what the differences between the two are and when you feel that using a fragment is the proper direction to go. Make sure to speak to the high level overview of what an activity does to an app versus fragments.

3) Do you consider yourself stronger in C++, C#, Java, or Python?

Before your interview, do some research to understand what tech stack Slack uses so you can best prepare and highlight your expertise. If you aren’t as strong in one of the skills you feel is necessary, be sure to explain how you’ve used it and how you are growing your knowledge to become better. Be sure to be honest in your answer, as the company will likely test your strengths.

4) As you reflect back on your career to this point in your search for a new position, what would you say is your ideal work environment or culture?

While using this question as a key indicator on how you’ll fit with the team and the organization at Slack, it will be very important for you to research as much as you can on the work environment at Slack so you can match your priorities to that environment. If you have the opportunity to speak with an employee at Slack prior to your interview, that can shed valuable information. In the end, the culture and value of an organization are often a key indicator of long-term success in a job, so make sure that you reflect your values into what the company values.

5) What do you see as the top benefits of moving to a cloud based computing platform?

While cloud based computing has certainly had its positive impacts across many different industries, the field of software and technology development has its own unique benefits. For this question, your interviewer will be looking to hear that you understand just how a cloud based platform benefits the field. In your answer, focus on resources that impact both the work that the team at Slack performs and the end users of the software.

6) Our cloud computing at Slack requires our experts to take proper security measures in their work. What security measures are you familiar with utilizing in a cloud platform?

As with any server or database storage, unique security risks are posed to organizations that have moved their data and applications to the cloud. At Slack, part of your role will be to ensure that all security measures are in place with the organizations data in the cloud and your interviewer is looking to hear that you are familiar with diagnosing security risks and taking action to prevent them with this question. Talk about your knowledge of the different cloud service providers and other security measures that you are familiar with taking in your work.

7) Do you have any unique skills or past work experiences that we can’t see on your resume that would benefit the team here at Slack?

This question is providing you the opportunity to potentially set yourself apart from your competition for this position. To do just that, it will be important for you to make sure that the unique skill or experience that you discuss matches with a critical need for Slack and the position that you are interviewing for. Whether you talk about a unique skill or experience, your research on this job will prove vital in your ability to make sure that it impresses your interviewer.

8) In designing Android software, what is your experience using parcelable versus serializable within an app?

Because parcelable is optimized for Android to be faster and more customizable, your interviewer will be looking to hear that you are willing to put in the extra work to utilize the parcelable method to achieve better performance within the software that you design. Give your interviewer your thoughts on the differences between the two methods of passing object references to activities within an app that you design and make sure that they understand that you are ready to perform the work to utilize the parcelable method when necessary.

9) What programming languages would you consider yourself fluent in?

While this question gives your interviewer insight into the diversity of your programming language experience, they most importantly want to know that you are adaptable and able to learn on the fly if needed. Talk about the different languages that you consider yourself fluent in and, if possible, do as much research into Slack as you can prior to your interview and try to speak to the specific languages that they work with.

10) We are looking for innovators to join us here at Slack. Where have you brought innovation in automation to a process in your career?

Innovation in software has occurred in many phases over the last 20 years and Slack is always striving to be on the forefront of innovation in their field. For this question, think back on your automation experience and talk about a concept that you helped create that you felt was innovative. Really sell your interviewer on your ability to think outside of the box with this question by hammering home the idea that you can help bring new innovations to the team at Slack.

11) If you were confronted with a time where you wouldn’t be able to meet a deadline here at Slack, what steps would you take when you made that realization?

At some point in any person’s career, the inevitable happens and an important deadline needs to be missed. With your interviewer fully understanding this fact, they are solely interested in how you react to this situation and what you do to make the situation right. In your answer, focus on the refocused planning and communication needed while also avoiding blaming others for the situation. Your interviewer holds accountability as a desirable virtue, so be sure to take accountability for actions in your response.

12) What do you feel is one of the top issues that is faced by data engineers today?

Being in the midst of the greatest technological revolution in the history of man, data engineers face many difficult issues in the work that they perform on a daily basis. While there are many directions that you can go with this question, be sure to focus your answer on something that you can speak passionately about. If you can research a common issue in the industry that Slack works in, you may likely score some bonus points with your interviewer.

13) What experience do you have in the different types of software maintenance?

As a reputable company, Slack takes their software maintenance processes seriously and your interviewer is looking to hear that you are familiar with the four different types of software maintenance. Talk to your interviewer about any work you have done in the past with corrective, adaptive, perfective and/or preventative software maintenance. Use specific examples and make sure that your interviewer walks away from your conversation knowing that you understand the importance of proper system maintenance.

14) What do you feel are the primary features and benefits of the Java programming language?

As a company that utilizes Java, Slack and your interviewer want to make sure that you have an understanding of the Java programming language and they do so by asking this question. Obviously a language packed with unique features, talk about the features that you can speak the most knowledgeably about and tie your direct experience to.

15) In your experience in software testing, would you consider yourself proficient in both testing and debugging processes?

As a reputable provider of software, Slack relies on their software testing engineers to both test and debug their products when necessary. Make your interviewer aware that you are knowledgeable on both processes by briefly explaining each process as you’ve worked on them in the past. Then, talk about your openness to working both testing and debugging processes if hired for this position.

16) Why Slack is popular?

The Jobs that Slack Does

Facilitates communication in the workplace. Helps teams communicate collaborate across remote distances. Enables and encourages the sharing of documents, images and other assets across teams.

17) Is Slack owned by Google?

Slack is a proprietary business communication platform developed by American software company Slack Technologies and now owned by Salesforce.

18) Is Slack a good app?

The Bottom Line. Slack is an excellent and powerful team messaging app with a rich collection of settings and options. It’s among the best, but it’s also the most expensive. PCMag editors select and review products independently.

19) What is the difference between Slack and WhatsApp?

What are both? Slack is a business communication tool for centralising teamwork, while WhatsApp is the centralised messaging and voice-over IP service platform.

20) Is Slack better than GroupMe?

GroupMe Vs Slack: Setup and initial use

Since GroupMe is mostly used as a smartphone app and Slack is more popular as a desktop tool, their installation and initial setup are vastly different. But, the most significant difference between the two apps is the fact that Slack needs to be implemented on a team level.

21) Is Slack secure?

By default, Slack encrypts data at rest and data in transit for all of our customers. We further protect your data with tools like Slack Enterprise Key Management (Slack EKM), audit logs, and integrations with top data loss prevention (DLP) providers.

22) Can you use Slack for free?

You can use the free version of Slack with some limitations, or upgrade to a paid plan to access more features.

23) Why is Slack better than WhatsApp?

To improve user-friendliness, Slack manages its space more efficiently. First, it divides conversations into Public, Private channels and direct messages, while WhatsApp offers only in one-to-one or group chats. Second, Slack lets you customize colors of the left sidebar improving user experience.

24) How does Slack make money?

Slack makes money by offering 3 different premium subscriptions aimed at small-, medium-, as well as enterprise-sized businesses. The company utilizes a freemium business model to attract users. This means that everyone interested can try out Slack and its applications for free – as long as they please.

25) Does Slack work with Gmail?

Keep conversations moving forward by bringing context from an email into a Slack channel or direct message with the Slack for Gmail Add-On available in the G Suite Marketplace. You can choose to add a message and include attachments along with the email as well.

26) What are the disadvantages of Slack?

Cons Explained

Slack moves quickly and it can be hard to keep track of what’s going on. Addictive by nature: With push notifications and emojis, Slack has much of the addictive quality of social media. This may mean your team spends too much time checking Slack and less time actually doing their work.

27) How do I publish a Slack app?

Just navigate to your app from and you can see the option to “Publish” it to the App Directory. Your app should be live before your blog post and tweets, so you take a deep breath and you hit “Publish”. Congratulations, your app’s in the App Directory!

28) Can Slack send messages to WhatsApp?

The integration will allow you to receive WhatsApp messages in a Slack channel and respond to them in threads right from the Slack channel. A new thread will be created for each customer phone number and the thread will be used to converse with this particular customer.

29) How do I join a Slack channel?

Join channels
Click Channel browser at the top of your left sidebar. If you don’t see this option, click More to find it.
Browse the list of public channels in your workspace, or use the search bar to search by channel name or description.
Select a channel from the list to view it.
Click Join Channel.

30) Does Slack spy on you?

Companies with Enterprise plans can use more powerful third-party search tools with an easier-to-search interface. Aside from viewing actual messages, any Slack user can see high-level usage data on the Analytics tab (head to

31) Is Slack safer than email?

Since Slack is primarily a web app, it uses HTTPS encryption just like any legitimate website that collects potentially sensitive data. Though this means data is encrypted both en-route and while at rest on Slack’s servers, its safety is entirely at the mercy of the platform and its own security protocols.

32) Is Slack private?

Public vs.

When using an app to send work messages, you need to understand that nothing is actually private. However, Slack gives its users an option to create and chat in public and private channels.

33) Is Slack a private company?

In June 2019, Slack Technologies went public on the New York Stock Exchange via a direct stock listing.

34) What is the equivalent of Slack?

Google Chat is a Slack alternative built into Gmail, and you can chat with anyone who also has a Gmail account, whether that account is paid or free. You’ll also be able to use Google Meet with Google Chat in order to conduct audio and video calls.

35) Is Slack a freemium model?

Slack operates on a freemium model, allowing users to upgrade to a paid service if they need more usage or advanced functionality. The slack business model relies on a freemium strategy coupled with direct sales teams to target enterprise customers with recurring revenue above $100,000.

36) Who are Slack customers?

Walmart, Nike, Capital One, McKinsey, T-mobile, Comcast, NewsCorp are all customers. Noting those last two, Slack’s second core audience might be media companies: NYTimes, NBCUniversal, Buzzfeed, Turner, and Nasdaq are also customers.

37) Can Slack send an email?

Slack’s default email app

Right in Slack’s App Inventory, you can find an aptly named ‘Email’ app. With it, you can create an individual email address for each channel you want to send emails to. And once you have it, you can use it with any service, or you can simply send or forward emails straight to the channels.

38) How do I start Slack with Google?

All you need to do is enter on command, /meet . That’s it. Meet for Slack takes care of the rest. Keep your team in the loop.

39) What does free Slack include?

On the free version of Slack, workspaces have up to 5GB of file storage available. Anything uploaded to a channel or a direct message (e.g., PDFs, documents, images, screenshots, audio and video files) counts towards this limit.

40) How long does it take to get a Slack app approved?

How long until it gets reviewed? When you press the button to submit, you will be entered in the queue for your app to be reviewed. Slack says that this can take anywhere between 4–6 weeks depending on how busy they are, which is a long time.

41) How do I approve Slack app?

Manage app approval
From your desktop, click your workspace name in the top left.
Select Settings & administration from the menu, then click Manage apps to open the Slack App Directory.
Click App Management Settings in the left column.
Click the toggle next to Require App Approval to enable the setting.

42) How does Slack bot work?

When attached to a Slack app, bots can add interactive components (such as buttons) to messages, which members can interact with. These interactive components trigger specific actions on your servers, so that you can perform certain tasks.

43) Can anyone join a Slack workspace?

Anyone with an approved email address can join by clicking your workspace’s sign-up link, or entering their email on the sign-in page. Note: If a member of your workspace requests an invitation for someone with an approved email address, the request will be approved automatically.

44) Can Slack show your location?

Location tracking can be triggered when you enter an area, exit an area, or if you exit/enter the same area. This is where you can get creative! If you want to set multiple Slack statuses, you will need to create a new Applet for each location you want to trigger.

45) Can people see what Im doing on Slack?

It’s possible for anyone on Slack to see how much a person uses it. The analytics page [Slack channel name]. shows how many messages have been sent on a workspace and the most popular public channels.

46) Is Slack owned by Google?

Slack is a proprietary business communication platform developed by American software company Slack Technologies and now owned by Salesforce.

47) Can you use Google Docs in Slack?

Use Google Drive in Slack

From any conversation, click the plus icon next to the message field. Search for Google Drive, then choose whether you’d like to create a document, presentation, or spreadsheet. Add a title to your file and a message if you’d like.

48) Does slack make a profit?

In 2020, Slack reported $902 million in revenue. But even though they generated nearly $1 billion, Slack is still not profitable. Dating back to their first public filings as a public company in FY 2019, they posted a net loss of $138.9 million and another $292.5 million in FY 2020.

49) How do I publish a Slack app?

Just navigate to your app from and you can see the option to “Publish” it to the App Directory. Your app should be live before your blog post and tweets, so you take a deep breath and you hit “Publish”. Congratulations, your app’s in the App Directory!

50) Is free Slack worth it?

If your work requires team collaboration, you should pay for Slack, because eventually there’s so much for you and your team. Slack and its integrations will save your team time and increase productivity. So if you are looking to improve the time efficiency and productivity of your team, Slack is the right tool.

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