This guide tracks 8 patterns (3 of them typically hard), 6 commonly reported questions, and a 4-round loop that usually runs 2-4 weeks.
Key patterns
Showing 3 of 8Common questions
Showing 3 of 6Interview process
Showing 1 of 4 roundsStart studying now, without an account
Every lesson below is a free public reading page. No sign-up, no install, and the worked examples run in the tab.
The Python behind Snap Inc.'s top patterns
These lessons do not teach the patterns themselves. They teach the language mechanics each pattern is built from, which is the part you have to have in your hands before the pattern is worth practicing.
- Arrays & HashingPython10 min readTuples & setsGroup fixed records with tuples and track uniqueness with sets.
- Arrays & HashingPython10 min readDictionariesMap keys to values: read safely, assign, and merge dictionaries.
- GraphsPython10 min readChoosing the right data structurePick a set or dict for fast membership and lookups instead of scanning a list.
- GraphsPython11 min readRecursion: a function that calls itselfSolve a problem in terms of a smaller version of itself, with a base case to stop.
- BacktrackingPython10 min readListsBuild, index, slice, and grow Python's ordered, mutable collection.
- BacktrackingPython10 min readList, dict & set comprehensionsTransform and filter collections in one readable expression.
How Snap Inc. judges you outside the code
The values and engineering norms the interviewers are calibrated against. Useful for the behavioral round, and useful for deciding which trade-off to argue for in the technical one.
Values they name
- Kind - treat everyone with kindness and empathy
- Smart - think critically and innovatively
- Creative - embrace creativity in everything
What they look for in behavioral rounds
- Show kindness and empathy in interactions
- Demonstrate smart problem-solving
- Display creative thinking
- Show passion for Snapchat products
- Exhibit collaborative team behavior
How the team builds
- Camera company first
- AR and lens innovation
- Privacy and ephemeral content
- Mobile-first engineering
- Creative expression focus
Primary stack
- C++
- Python
- Swift
- Kotlin
- React
- Machine Learning
- Code review
- thorough reviews with product awareness
- Deployment
- continuous deployment for mobile apps
- Documentation
- documentation for systems and APIs
Reading the guide is the easy part. Snap Inc. will ask you to perform.
CodeSparring is a practice environment, not a question bank. You sit a full round against an AI interviewer, in an editor that runs your code, and you leave with a score and a specific next rep.
An interviewer that reacts
Carry one problem from clarifying questions through to working code while an AI interviewer responds to what you say and what you type, by voice or by text.
Code that actually runs
An editor in the page with a real runtime and real test cases. You run your solution and read the output, the same way you would in a shared editor on the day.
A scored round, not a vibe
Every session ends with a rubric covering problem solving, communication, and code quality, so you can see which part of the round is costing you the offer.
And 364 lessons you can read right now, free
The whole curriculum is public. Read the concept, run the worked example in the tab, and only sign in when you want the graded exercise at the end of a lesson.