# Software Engineer
**Role:** Software Engineer · **Level:** F
**Company:** [BP](https://scaleengineer.com/companies/bp)
**Difficulty:** Medium
**Salary:** US$90000 - US$120000
**Experience:** 3 - 5
**Timeline:** ~14 days
This interview process is for a Software Engineer role at BP at level F. It is designed to assess technical skills, problem-solving abilities, and cultural fit within the company.
Canonical: https://scaleengineer.com/interviews/bp/f-software-engineer
---
## Overall evaluation

- Technical Skills
- Communication Skills
- Behavioral and Cultural Fit

## Questions asked

- Describe a time you had to debug a complex issue. What was your approach?
- How would you design a URL shortening service?
- What are the trade-offs between SQL and NoSQL databases?
- Tell me about a project you are particularly proud of and your role in it.
- How do you handle conflicting priorities or tight deadlines?
- Explain the concept of RESTful APIs.
- What is your experience with cloud computing platforms (AWS, Azure, GCP)?
- Describe a situation where you disagreed with a team member or manager. How did you resolve it?
- How would you design a system to handle real-time notifications for a social media platform?
- What are your strengths and weaknesses as a software engineer?

## Preparation tips

### lists

- Review fundamental computer science concepts: data structures, algorithms, operating systems, databases.
- Practice coding problems on platforms like LeetCode, HackerRank, or similar.
- Study system design principles and common architectural patterns.
- Prepare examples for behavioral questions using the STAR method (Situation, Task, Action, Result).
- Research BP's business, values, and recent projects.
- Understand the specific technologies and tools mentioned in the job description.
- Prepare questions to ask the interviewer about the role, team, and company culture.

### studyPlan

- {"title":"Data Structures and Algorithms","longDescription":"Weeks 1-2: Focus on Data Structures and Algorithms. Cover arrays, linked lists, trees, graphs, hash tables, sorting, searching, dynamic programming. Practice at least 5 problems per topic.","shortDescription":"Weeks 1-2: DSA fundamentals and practice."}
- {"title":"System Design","longDescription":"Weeks 3-4: Dive into System Design. Study concepts like scalability, availability, reliability, load balancing, caching, databases (SQL vs. NoSQL), message queues, and microservices. Review common system design interview questions.","shortDescription":"Weeks 3-4: System Design principles and patterns."}
- {"title":"Behavioral Preparation","longDescription":"Week 5: Behavioral preparation. Identify key projects and experiences that demonstrate leadership, teamwork, problem-solving, and adaptability. Prepare stories using the STAR method for common behavioral questions.","shortDescription":"Week 5: Behavioral questions and STAR method."}
- {"title":"Company and Role Research","longDescription":"Week 6: Company and role research. Understand BP's mission, values, and recent news. Analyze the job description thoroughly and prepare questions for the interviewers.","shortDescription":"Week 6: BP research and question preparation."}

## Location differences

- {"location":"London","differences":{"tips":["For London, emphasize experience with cloud platforms like Azure or AWS, as these are heavily used.","For Houston, highlight any experience with large-scale data processing or energy-related technologies.","For Chicago, focus on experience with distributed systems and high-availability architectures."],"interviewFocus":["System Design","Problem Solving","Behavioral"],"commonQuestions":["How would you design a system to handle real-time data streaming for a large number of users?","Describe a challenging technical problem you faced and how you solved it.","What are your thoughts on microservices architecture and its trade-offs?","How do you ensure code quality and maintainability in a large project?","Tell me about a time you had to work with a difficult stakeholder."]}}
- {"location":"Houston","differences":{"tips":["For London, emphasize experience with cloud platforms like Azure or AWS, as these are heavily used.","For Houston, highlight any experience with large-scale data processing or energy-related technologies.","For Chicago, focus on experience with distributed systems and high-availability architectures."],"interviewFocus":["System Design","Problem Solving","Behavioral"],"commonQuestions":["How would you design a system to handle real-time data streaming for a large number of users?","Describe a challenging technical problem you faced and how you solved it.","What are your thoughts on microservices architecture and its trade-offs?","How do you ensure code quality and maintainability in a large project?","Tell me about a time you had to work with a difficult stakeholder."]}}
- {"location":"Chicago","differences":{"tips":["For London, emphasize experience with cloud platforms like Azure or AWS, as these are heavily used.","For Houston, highlight any experience with large-scale data processing or energy-related technologies.","For Chicago, focus on experience with distributed systems and high-availability architectures."],"interviewFocus":["System Design","Problem Solving","Behavioral"],"commonQuestions":["How would you design a system to handle real-time data streaming for a large number of users?","Describe a challenging technical problem you faced and how you solved it.","What are your thoughts on microservices architecture and its trade-offs?","How do you ensure code quality and maintainability in a large project?","Tell me about a time you had to work with a difficult stakeholder."]}}

## Round 1: Coding and Algorithms Round
**Type:** Technical Interview · **Difficulty:** Medium · **Duration:** 45 min
Focuses on coding skills and data structures/algorithms.
This is typically the first technical round. It focuses on assessing your core programming skills and your understanding of fundamental computer science concepts. You will be asked to solve coding problems, often involving data structures and algorithms, and explain your solutions. The interviewer will evaluate your ability to write clean, efficient, and correct code, as well as your approach to problem-solving and debugging.
**Interviewers look for:** Clean and efficient code; Logical and structured approach to problem-solving; Clear communication of thought process; Ability to handle edge cases and test code
**Evaluation criteria:** Coding proficiency; Understanding of data structures and algorithms; Problem-solving approach; Ability to explain code and logic
**Common rejection reasons:** Inability to articulate thought process; Lack of fundamental programming knowledge; Poor problem-solving approach; Not demonstrating sufficient coding proficiency
## Questions

- Given an array of integers, find the contiguous subarray with the largest sum.
- Implement a function to reverse a linked list.
- Find the kth smallest element in a binary search tree.
- Write a function to determine if a string is a palindrome, ignoring non-alphanumeric characters and case.

## Preparation tips

- Practice coding problems extensively.
- Be prepared to explain your code line by line.
- Think out loud and communicate your thought process.
- Consider time and space complexity of your solutions.
- Practice writing code on a whiteboard or in a shared editor.

## Round 2: System Design Round
**Type:** System Design Interview · **Difficulty:** Hard · **Duration:** 60 min
Assesses ability to design scalable and reliable systems.
This round assesses your ability to design complex, scalable, and reliable software systems. You will be given an open-ended problem (e.g., design Twitter's feed, design a URL shortener) and expected to break it down, discuss trade-offs, and propose a high-level architecture. The interviewer will probe your understanding of distributed systems, databases, caching, and other relevant technologies.
**Interviewers look for:** Structured approach to design; Consideration of various components (databases, caching, load balancers); Ability to justify design choices; Understanding of potential bottlenecks and failure points
**Evaluation criteria:** System design principles; Scalability and performance considerations; Trade-off analysis; Understanding of distributed systems; Ability to handle failure scenarios
**Common rejection reasons:** Inability to design scalable systems; Lack of understanding of distributed systems concepts; Poor trade-off analysis; Not considering failure scenarios
## Questions

- Design a system like TinyURL.
- Design a news feed system for a social media platform.
- How would you design a rate limiter?
- Design a system to count unique visitors to a website.

## Preparation tips

- Study common system design patterns and architectures.
- Practice designing various systems.
- Be prepared to discuss trade-offs for different design choices.
- Consider scalability, availability, and reliability.
- Think about potential bottlenecks and how to address them.

## Round 3: Behavioral and Fit Interview
**Type:** Behavioral Interview · **Difficulty:** Medium · **Duration:** 45 min
Assesses behavioral competencies and cultural fit.
This round focuses on your behavioral and cultural fit within BP. You'll be asked questions about your past experiences, how you handle certain situations, your strengths and weaknesses, and your career aspirations. The goal is to understand how you work, collaborate, and align with the company's values. Use the STAR method (Situation, Task, Action, Result) to structure your answers.
**Interviewers look for:** Clear and concise communication; Honesty and self-awareness; Examples demonstrating desired behaviors (e.g., leadership, teamwork); Alignment with BP's values; Enthusiasm for the role and company
**Evaluation criteria:** Behavioral competencies; Teamwork and collaboration; Problem-solving approach in past experiences; Cultural fit; Motivation and career goals
**Common rejection reasons:** Poor communication skills; Lack of self-awareness; Inability to provide specific examples; Not aligning with company values; Negative attitude
## Questions

- Tell me about a time you failed. What did you learn from it?
- Describe a situation where you had to work with a difficult colleague. How did you handle it?
- What are your career goals for the next 3-5 years?
- Why are you interested in working at BP?
- Tell me about a time you took initiative to improve a process or solve a problem.

## Preparation tips

- Prepare examples for common behavioral questions using the STAR method.
- Reflect on your past projects and identify key learnings.
- Be honest and authentic in your responses.
- Show enthusiasm for the role and BP.
- Ask thoughtful questions about the team and culture.