Backend Interviewing Process at Wix Engineering

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Pijus Navickas, Software Engineer Backend Interviewing Process at Wix Engineering [email protected] https://pijusn.eu

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Know Wix 01

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Wix.com Wix.com

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Site-Builder Wix.com

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Business Domains Wix.com

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Structure Wix.com "verticals" "companies" Autonomous group of cross-functional teams. "guilds" Community of people of the same profession. Blog Server

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Agile? Yes, but implementation depends on team

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Technologies (server) Wix.com … pretty sure I'm missing something

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DevOps? We have DevOps-oriented culture

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You don't code, You develop. You own it.

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Wix Engineering Locations Ukraine Kiev Dnipro Israel Tel-Aviv Be’er Sheva Haifa Lithuania Vilnius ROW US, Canada, Berlin and ROW

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~1000 (micro/macro/mega)services

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~700 developers

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~50 BE engineers in Vilnius

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Being a great engineer 02

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Passion may be expressed as... ▪ Side-projects. ▪ Watching talks. ▪ Reading books & articles. ▪ Following news. ▪ Doing talks. ▪ Knowing something really deep. ▪ ... Great Engineer

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Technology stack ▪ Things you use - know well. ▪ Know the WHY. ▪ Otherwise - doesn't matter THAT much. Great Engineer "Why did you choose …?" "Why is … better?"

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Key principles ▪ Readable over writable. ▪ Simple over smart. ▪ Automated over manual. Great Engineer

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Readable over writable ▪ Naming matters. ▪ Declarativity is better*. ▪ Expressive design. ▪ Avoid noise. ▪ Related to simplicity. Great Engineer *except when it's not

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Simple over smart ▪ Small units are helpful. ▪ Avoid over-engineering. Great Engineer

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Automated over manual ▪ Tests are mandatory. ▪ We are lazy. ▪ Also acts as documentation. Great Engineer

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Interview Process 03

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Homework Assignment Technical Interview Typical Flow Hiring Process HR Interview Team Lead Interview + 1-2 evenings 3 hours

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Homework Assignment 04

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Homework Assignment Technical Interview Typical Flow Hiring Process HR Interview Team Lead Interview +

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Purpose ▪ You get to know Wix a little. ▪ We get to know you a little. ▪ Test your coding skills. Homework Assignment

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Evaluation ▪ Technical requirements. ▪ Code. ▪ Design. Homework Assignment

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Notable points / tips ▪ Direct technical requirements are a must. ▪ If something is not speciﬁed, use your judgement; code is still evaluated. ▪ Test code is also evaluated. ▪ Avoid adding unnecessary elements; ends up increasing complexity. ▪ Good names help A LOT. ▪ Use tools and language you know well. Homework Assignment

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OOP vs FP both are great but... ▪ Know both. ▪ Apply FP principles. ▪ Don't go hard-core FP. Homework Assignment Immutable… Pretty much everything. No side-eﬀects. Write declarative code.

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Preparation (books) Homework Assignment

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Technical Interview 05

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Homework Assignment Technical Interview Typical Flow Hiring Process HR Interview Team Lead Interview +

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Purpose ▪ Test your problem solving. ▪ Test your reasoning. ▪ Test your system design skills. ▪ Test your ability to communicate your ideas. Technical Interview

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▪ Thought process. ▪ Knowledge. ▪ Logic. Evaluation Technical Interview

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▪ Verbalise your thoughts. ▪ Don't get stuck for long. Ask. ▪ There is rarely a correct solution. ▪ You are not expected to ace everything. ▪ You will be asked WHY questions. Notable points / tips Technical Interview

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Preparation (books) Technical Interview

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Preparation (lots of material) Technical Interview https://github.com/checkcheckzz/system-design-interview

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Remaining Stages 06

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Homework Assignment Technical Interview Typical Flow Hiring Process HR Interview Team Lead Interview +

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I don't know. Good luck.

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Join Us 07

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https://jobs.wix.com Join Us

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Notable points / tips ▪ Better too much than too little. ▪ Learn, improve and come back. Join Us