Canonical Software Engineer interviews typically run 5–7 rounds: written assessment, aptitude test, coding exercise, multiple technical interviews, and behavioral interviews. The process spans several months and is distinguished by extensive long-form written screening before any live conversation.
$119K
Avg. Base Comp
$149K
Avg. Total Comp
5-7
Typical Rounds
6-12 weeks
Process Length
We've seen a lot of unconventional hiring processes, but Canonical's stands out for one defining characteristic: the sheer volume of written work before you ever speak to a human. Multiple candidates report spending what felt like a full day completing long-form written responses, a cognitive aptitude test, and a take-home coding exercise, all before any live conversation. Candidates who expected a quick phone screen followed by a coding round were consistently caught off guard by how much the written stage demanded upfront.
What's particularly non-obvious is how much of the written screening focuses on academic and personal history rather than technical depth. Candidates were asked about high school GPA, class rank, and how they performed academically going back years. This isn't a formality. One candidate noted they had to justify claims about being in the top 5 to 10 percent of their class. Canonical appears to be screening for a specific profile of person, not just a set of technical skills, and the behavioral and psychometric components carry real weight. Candidates who treated them as secondary to the technical work found themselves unprepared for how seriously Canonical takes that dimension of the process.
On the technical side, the difficulty is real but not extreme. The coding tasks are time-pressured rather than algorithmically brutal, and the live rounds tend to go deep on Linux, DevOps, and role-specific tooling. One candidate who received an offer walked through CI/CD and SRE practices in detail across multiple rounds. A recurring theme across nearly every experience is that Canonical rewards candidates who can demonstrate genuine alignment with how they work, not just technical competence. The process can stretch across months, and the candidates who made it furthest were the ones who treated the written portions with the same seriousness as a live technical interview.
Synthetized from 9 candidates reports by our editorial team.
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Real interview reports from people who went through the Canonical process.
My interview process at Canonical was pretty long and very technical, and it ended up being four interviews for the Software Engineer role. The first round focused on ReactJS and frontend questions, so it felt like they were checking whether I had solid hands-on experience rather than just general familiarity. The second interview shifted hard into C++ and Linux, which was a noticeable change in emphasis and made the process feel broader than a typical frontend-heavy loop. After that, I had a third technical interview centered on common fullstack JavaScript questions, and the fourth round went deeper into fullstack engineering topics overall. In parallel with that style of process, I also had the more Canonical-specific screening step where they send a long email with around 40 questions before moving forward, and there can also be a written interview or take-home style assessment plus a psychometric assessment before the live rounds begin.
What stood out most was how much they seemed to care about both technical depth and fit with Canonical’s way of working. The Linux interview included very basic command-line questions like cat, chmod, and export, along with theory questions such as the difference between a soft link and a hard link. There were also some behavioral questions mixed in, like asking about the project I was most proud of. Another recurring theme was that they wanted to understand your experience with Canonical products, architecture qualities, engineering methodologies, and team efficiency, so it wasn’t just algorithmic problem-solving. The process felt more like a broad engineering and systems knowledge check than a LeetCode-style interview.
Overall, I’d call it moderately difficult mostly because of the breadth and the number of rounds, not because of tricky coding puzzles. I didn’t get an offer, and the process was professional throughout, but definitely thorough. If you’re preparing, I’d make sure you can speak comfortably about React, JavaScript, C++, Linux fundamentals, and your own engineering decisions, and be ready for a long written screening before the live interviews even start.
Prep tip from this candidate
Be ready for Canonical’s long written screening and the ~40-question email before live interviews. For the technical rounds, review React, C++/Linux basics like chmod, export, and soft vs. hard links, and be prepared to explain your own engineering choices and familiarity with Canonical products.
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Synthesized from candidate reports. Individual experiences may vary.
A lengthy written questionnaire sent via document (Word/PDF) covering personal background, academic history (including high school GPA and class ranking), previous employment, technical experience, and alignment with Canonical's mission. Responses are completed and emailed or submitted back, and this phase is widely noted as the most time-consuming and distinctive part of the process.
A GIA/aptitude-style test featuring word and shape puzzles designed to evaluate general cognitive ability. Candidates also complete a behavioral or psychometric assessment evaluating personality and working style.
A practical coding exercise delivered via a platform like DevSkiller or as a take-home assignment. Tasks are real-world in nature, time-pressured, and may include problems such as implementing a Polish notation calculator or general DSA-style programming challenges.
Two to four live technical interviews covering topics specific to the role, such as Kubernetes, cloud infrastructure, Linux, CI/CD, DevOps, SRE practices, and general software engineering. One round typically focuses on the specific technology stack for the role, while another may involve a system-design-style discussion.
A behavioral interview that explores strengths, motivations, and fit with Canonical's culture and mission. Questions can be direct and probing, covering topics such as criticisms of Canonical's technical decisions, conflict resolution, and detailed reasoning behind career choices.