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SlackBackend Engineer
Updated Aug 13, 2021

Slack Backend Engineer Interview Experiences 2026

Real, anonymous reports from people who interviewed for Backend Engineer at Slack, newest first and distilled into what to expect across the loop.

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Hot & recentNewest first
> 1 year
Average Positive Toronto, ON

I interviewed through a Toronto-focused opening that started with a short HR screen on Zoom, then moved into a hiring manager call. The manager asked about my previous projects and specifically how I’d collaborated with other teams. That teamwork thread continued as the process progressed.

For a third round, I reviewed a junior developer’s pull request and had to respond in a kind, empathetic way. The tone they wanted came through clearly in how they framed the feedback. The final round was the longest: a 4-and-a-half-hour day with four different people, broken into multiple sessions.
> 1 year
Easy Negative Pune

My experience was dominated by a sense of disregard, especially from HR after I completed the work. In one timeline, I was given a take-home or coding-style task focused on SQL using a limited Slack.db PostgreSQL dataset. The questions were fairly straightforward—write a query and then run it in a programmatic way—and I felt like I was doing what was expected. Still, even if I performed well, HR went silent afterward and the follow-up sounded like a generic “we’re not proceeding” without any meaningful feedback.

Another part of what I went through left me equally frustrated: I received an email asking for portfolio links and additional information, I replied quickly and followed up a few days later, and then nothing. I remember expecting at least a courtesy update that they’d decided to move on, but the lack of response felt unprofessional.

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