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Vanta interview notes, page 1 of 2

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Screna has 13 Vanta interview write-ups. The most reported round is the technical phone screen (8).

13 interview notes · updated Jul 2026

Vanta·Software Engineer·Onsite - Coding / Algorithms

Apr 2026
Vanta's coding round for the Software Engineer role had the same 'uniq' problem that keeps showing up in reports. Nothing surprising, just more of the same.
  • Implement a function that returns only the unique elements from a collection, similar to a 'uniq' utility.

“Yep, it's the one everyone warns you about.”

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Vanta·Software Engineer·Technical Phone Screen

Apr 2026
Vanta software engineer screen, coding round. One question, pretty focused on string processing. Nothing too wild but there are a few wrinkles worth knowing about.
  • Implement a function that collapses consecutive duplicate lines in a sequence of strings, similar to how the Unix `uniq` command works.

“The core logic is simple enough, just track the previous element and skip if it matches the current one.”

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Vanta·Software Engineer·Technical Phone Screen

May 2026
Vanta software engineer interview with a security training tracking problem. Pretty focused on getting the status logic right, not just the math.
  • Given a training start day, the number of days needed to complete a security training, and a target evaluation day, write a function that determines whether the employee finished by the target day and, if not, how many days overdue they are. The function should return explicit status labels like 'not started', 'in progress', 'completed', or 'overdue'.

“I jumped straight into the overdue calculation and nearly forgot to handle the 'not started' case where the target day is before the training even begins.”

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Vanta·Software Engineer·Onsite - System Design / Architecture

May 2026
Did a virtual onsite for a Software Engineer role at Vanta. The system design portion focused on metrics around user activity, which felt pretty open-ended.
  • Design a system that tracks daily and monthly active users.

“Pretty classic metrics-tracking prompt but the scope can balloon fast if you're not careful.”

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Vanta·Software Engineer·Technical Phone Screen

May 2026
Vanta software engineer interview with a tree-traversal problem involving employee groups. Pretty clean problem once you see the structure, but there's more to it than a first glance suggests.
  • Given a tree of employee groups (represented as a parent-to-children mapping) and a list of employees each with their group and overdue training days, compute for every group the total employee count and total overdue training days, including all nested subgroups.

“I started with a recursive DFS and it felt right pretty quickly.”

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Vanta·Software Engineer·Technical Phone Screen

May 2026
Vanta coding screen for a software engineer role. One meaty implementation question that sounds easy until you start thinking about flags and streaming edge cases.
  • Implement the Unix `uniq` command. Given a stream of input lines, collapse adjacent duplicates into one line, and support the -c, -d, and -u flags.

“I got the basic dedup logic pretty fast but then the flags tripped me up more than I expected.”

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Vanta·Software Engineer·Onsite - System Design / Architecture

May 2026
Vanta system design round, one big question about building a DAU/MAU metrics pipeline at scale. The question had a lot of surface area and I don't think I covered all of it well, but it was a genuinely interesting problem to work through.
  • Design a system that computes and serves DAU and MAU for a large consumer app. Cover metric definitions, event ingestion, deduplication, accurate computation across time zones and late arrivals, storage and compute choices, dashboard serving, and monitoring.

“This one sprawls.”

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Vanta·Software Engineer·Onsite - Behavioral / Leadership

Jun 2026
Behavioral round at Vanta for a software engineer role, but instead of the usual 'tell me about a time when' format, they threw hypothetical scenarios at me and wanted me to reason through them out loud.
  • Given a specific hypothetical situation, how would you handle it? Walk through your reasoning, the principles guiding your decision, who the stakeholders are, and what trade-offs you'd be making.

“I kept waiting for them to ask about something I'd actually done, but they never did.”

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Vanta·Software Engineer·Technical Phone Screen

Jun 2026
Vanta software engineering interview with a pretty meaty coding problem about a streaming test logger. The whole thing was one question with three parts, and the complexity ramps up fast by part three.
  • Design a streaming logger for test runs with globally strictly increasing timestamps. Implement three operations: log(test_id, timestamp, status) to record a test result, get_min_fix_time(test_id) to return the shortest duration from the start of a failing streak to the next passing status for a given test (or null if no such transition exists), and get_max_concurrent_failure_period(min_tests) to return the longest contiguous time window during which at least min_tests distinct tests are simultaneously failing (or null if none). Describe your data structures, algorithms, and time/space complexities.

“Part one was fine, just storing logs per test.”

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Vanta·Software Engineer·Onsite - System Design / Architecture

Jun 2026
System design round at Vanta for a software engineer role, focused entirely on building a DAU/MAU tracking system. Pretty deep dive into the full pipeline from ingestion to querying, and the trade-offs got surprisingly specific.
  • Design a system to compute Daily Active Users and Monthly Active Users at scale, covering the full pipeline from event ingestion through deduplication, storage, computation, and historical querying.
  • What are the trade-offs between using HyperLogLog, bitmaps, and raw storage for user deduplication in a DAU/MAU context?
  • How would you handle real-time versus batch computation for DAU/MAU, and what are the accuracy and cost implications of each?
  • How would you design the storage and querying layer to support historical DAU/MAU lookups efficiently?

“This was basically the whole interview in one question.”

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