# Software Engineer
**Role:** Software Engineer · **Level:** E4
**Company:** [Avito](https://scaleengineer.com/companies/avito)
**Difficulty:** Medium to Hard
**Salary:** US$110000 - US$150000
**Experience:** 4 - 7
**Timeline:** ~10 days
This interview process is designed to assess candidates for the Software Engineer (E4) role at Avito. It evaluates technical skills, problem-solving abilities, system design knowledge, and cultural fit.
Canonical: https://scaleengineer.com/interviews/avito/e4-software-engineer
---
## Overall evaluation

- Technical Skills
- System Design
- Behavioral and Cultural Fit

## Questions asked

- Given an array of integers, find the contiguous subarray with the largest sum.
- Design a URL shortening service like bit.ly.
- How would you design a system to handle real-time notifications for a social media platform?
- Tell me about a time you disagreed with a technical decision and how you handled it.
- What are the trade-offs between using a relational database and a NoSQL database for a user profile service?
- Explain the concept of eventual consistency.
- How do you approach testing your code?
- Describe a situation where you had to deal with a production issue under pressure.

## Preparation tips

### lists

- Review fundamental data structures and algorithms.
- Practice coding problems on platforms like LeetCode, HackerRank, or Codewars.
- Study common system design patterns and principles.
- Prepare examples for behavioral questions using the STAR method (Situation, Task, Action, Result).
- Research Avito's products, services, and engineering blog.
- Understand Avito's company culture and values.

### studyPlan

- {"title":"Data Structures and Algorithms","longDescription":"Weeks 1-2: Focus on core data structures (Arrays, Linked Lists, Stacks, Queues, Trees, Graphs, Hash Tables) and algorithms (Sorting, Searching, Dynamic Programming, Greedy Algorithms). Practice problems related to these topics, aiming for optimal time and space complexity.","shortDescription":"Weeks 1-2: Data Structures & Algorithms fundamentals. Practice problems."}
- {"title":"System Design","longDescription":"Weeks 3-4: Dive into system design concepts. Cover topics like API design, database choices (SQL vs. NoSQL), caching strategies, load balancing, message queues, and microservices architecture. Study common design patterns and practice designing scalable systems.","shortDescription":"Weeks 3-4: System Design principles and patterns. Practice designing systems."}
- {"title":"Behavioral Preparation","longDescription":"Week 5: Prepare for behavioral interviews. Reflect on past projects and experiences to formulate answers using the STAR method. Focus on demonstrating leadership, teamwork, problem-solving, and adaptability.","shortDescription":"Week 5: Behavioral questions preparation using STAR method."}
- {"title":"Company Research","longDescription":"Week 6: Research Avito thoroughly. Understand their business model, target audience, recent news, and technical challenges. Prepare thoughtful questions to ask the interviewers.","shortDescription":"Week 6: Company research and question preparation."}

## Location differences

- {"location":"Moscow","differences":{"tips":["Research Avito's presence and operations in your specific region.","Be prepared to discuss how your experience aligns with local business needs.","Highlight any experience with localization or internationalization if applicable."],"interviewFocus":["Understanding of local market trends and user behavior.","Familiarity with specific technologies prevalent in the region.","Ability to adapt solutions to local infrastructure and regulatory environments."],"commonQuestions":["How would you optimize a database query for a high-traffic e-commerce platform?","Describe a challenging bug you encountered and how you debugged it.","What are your thoughts on microservices vs. monolithic architectures for a platform like Avito?","How do you ensure code quality and maintainability in a large team?","Tell me about a time you had to mentor a junior engineer."]}}
- {"location":"Remote","differences":{"tips":["Familiarize yourself with Avito's global engineering challenges.","Be ready to discuss your contributions to open-source projects or technical communities.","Emphasize your ability to work in a fast-paced, international environment."],"interviewFocus":["Deep understanding of scalable distributed systems.","Proficiency in cloud-native technologies and practices.","Experience with large-scale data processing and analytics."],"commonQuestions":["How would you design a recommendation system for a diverse user base?","Discuss the trade-offs between consistency and availability in distributed systems.","What strategies do you use for performance testing and load balancing?","How do you approach code reviews to foster collaboration and learning?","Describe a situation where you had to influence technical decisions within a team."]}}

## Round 1: Technical Coding Round 1
**Type:** Data Structures and Algorithms Interview · **Difficulty:** Medium · **Duration:** 45 min
Coding challenge focusing on data structures and algorithms.
This round focuses on your core programming skills. You will be asked to solve one or two coding problems, typically involving data structures and algorithms. The interviewer will assess your ability to write clean, efficient, and correct code, as well as your problem-solving approach and communication skills.
**Interviewers look for:** Strong understanding of fundamental data structures and algorithms.; Ability to translate a problem into a working code solution.; Logical thinking and problem-solving skills.; Attention to detail and edge case handling.
**Evaluation criteria:** Correctness of the solution; Efficiency of the solution (time and space complexity); Clarity and organization of the code; Ability to explain the approach and reasoning
**Common rejection reasons:** Inability to articulate thought process clearly.; Suboptimal algorithmic solutions.; Poor time or space complexity.; Failure to handle edge cases.
## Questions

- Given a binary tree, find its inorder traversal.
- Find the kth smallest element in a sorted matrix.

## Preparation tips

- Practice coding problems on platforms like LeetCode, focusing on medium-difficulty questions.
- Be comfortable explaining your thought process step-by-step.
- Practice writing code on a whiteboard or in a shared editor without relying on IDE features like auto-completion.
- Review common algorithms and data structures.

## Round 2: System Design Round
**Type:** System Design Interview · **Difficulty:** Hard · **Duration:** 60 min
Design a scalable and reliable software system.
This round assesses your ability to design and architect complex software systems. You will be presented with a high-level problem (e.g., designing a social media feed, a URL shortener, or a ride-sharing service) and expected to propose a scalable, reliable, and maintainable solution. This includes discussing database choices, API design, caching, load balancing, and handling potential failures.
**Interviewers look for:** Experience in designing large-scale, distributed systems.; Understanding of system design principles (e.g., CAP theorem, consistency models).; Ability to break down complex problems into manageable components.; Knowledge of various technologies and their applications.
**Evaluation criteria:** Scalability of the proposed design; Reliability and fault tolerance; Clarity and completeness of the design; Ability to justify design choices and trade-offs
**Common rejection reasons:** Lack of understanding of distributed systems principles.; Inability to design scalable and reliable systems.; Poor trade-off analysis.; Not considering failure scenarios.
## Questions

- Design a system to count unique visitors to a website in real-time.
- Design a distributed cache system.

## Preparation tips

- Study common system design patterns and architectures.
- Practice designing systems for scale and availability.
- Understand trade-offs between different technologies and approaches.
- Be prepared to discuss your own system design experiences.

## Round 3: Behavioral and Managerial Round
**Type:** Behavioral Interview · **Difficulty:** Medium · **Duration:** 45 min
Assesses soft skills, teamwork, and cultural fit.
This round focuses on your behavioral and soft skills. You'll be asked questions about your past experiences, how you handle specific situations (e.g., conflict resolution, dealing with failure, leadership), and your motivations. The goal is to understand how you work within a team, your problem-solving approach in real-world scenarios, and your overall fit with Avito's culture.
**Interviewers look for:** Evidence of teamwork and collaboration.; Ability to handle conflict and challenges constructively.; Self-awareness and reflection on past experiences.; Motivation and passion for software engineering.; Cultural fit with Avito.
**Evaluation criteria:** Communication clarity; Teamwork and collaboration skills; Problem-solving approach in past experiences; Adaptability and learning mindset; Alignment with Avito's values
**Common rejection reasons:** Poor communication skills.; Lack of collaboration.; Inability to provide specific examples.; Mismatch with company culture or values.; Negative attitude.
## Questions

- Tell me about a time you failed. What did you learn from it?
- Describe a challenging project you worked on and your role in it.
- How do you handle constructive criticism?

## Preparation tips

- Prepare specific examples using the STAR method for common behavioral questions.
- Reflect on your strengths and weaknesses.
- Think about why you want to work at Avito and what you can contribute.
- Be ready to discuss your career goals and aspirations.