# Software Engineer
**Role:** Software Engineer · **Level:** D
**Company:** [BP](https://scaleengineer.com/companies/bp)
**Difficulty:** Medium to Hard
**Salary:** US$110000 - US$150000
**Experience:** 4 - 8
**Timeline:** ~14 days
This interview process is for a Software Engineer role at BP, specifically at Level D. It is designed to assess a candidate's technical skills, problem-solving abilities, and cultural fit within the company.
Canonical: https://scaleengineer.com/interviews/bp/d-software-engineer
---
## Overall evaluation

- Technical Skills
- Communication & Collaboration
- Behavioral & Cultural Fit
- Business Acumen

## Questions asked

- Tell me about a time you had to deal with a difficult stakeholder.
- How would you design a URL shortening service?
- What are the differences between TCP and UDP?
- Describe a project you are particularly proud of and your role in it.
- How do you handle production issues and debugging?
- Explain the concept of eventual consistency.
- What are your strengths and weaknesses as a software engineer?
- Design a system to handle real-time notifications for a social media platform.
- How do you stay updated with new technologies?
- Describe a situation where you disagreed with your team lead.

## Preparation tips

### lists

- Review core computer science fundamentals (data structures, algorithms, operating systems, databases).
- Practice coding problems on platforms like LeetCode, HackerRank, or similar.
- Understand distributed systems concepts and common design patterns.
- Prepare to discuss your past projects in detail, focusing on your contributions and the impact.
- Research BP's mission, values, and recent technological advancements.
- Familiarize yourself with common system design interview questions and frameworks.
- Prepare behavioral questions using the STAR method (Situation, Task, Action, Result).

### studyPlan

- {"title":"Data Structures and Algorithms","longDescription":"Weeks 1-2: Focus on Data Structures and Algorithms. Cover arrays, linked lists, trees, graphs, hash maps, sorting, searching, and dynamic programming. Practice problems related to each topic.","shortDescription":"Weeks 1-2: Data Structures & Algorithms. Practice coding problems."}
- {"title":"System Design","longDescription":"Weeks 3-4: Dive into System Design. Study concepts like scalability, availability, reliability, load balancing, caching, databases (SQL/NoSQL), and microservices. Work through common system design case studies.","shortDescription":"Weeks 3-4: System Design. Study scalability, databases, microservices."}
- {"title":"Behavioral Preparation","longDescription":"Week 5: Prepare for Behavioral and Situational Questions. Reflect on past experiences and prepare examples using the STAR method. Understand BP's values and how they align with your own.","shortDescription":"Week 5: Behavioral Prep. Use STAR method, align with BP values."}
- {"title":"Review and Mock Interviews","longDescription":"Week 6: Review and Mock Interviews. Consolidate knowledge, practice mock interviews (technical and behavioral) with peers or mentors. Focus on communication and clarity.","shortDescription":"Week 6: Review & Mock Interviews. Practice communication."}

## Location differences

- {"location":"Houston, USA","differences":{"tips":["Familiarize yourself with BP's digital transformation initiatives.","Be prepared to discuss your experience with specific cloud platforms relevant to the region.","Highlight projects that demonstrate scalability and resilience."],"interviewFocus":["Emphasis on cloud-native architectures (AWS/Azure/GCP)","Experience with large-scale data processing and analytics","Understanding of CI/CD pipelines and DevOps practices"],"commonQuestions":["How would you design a system to handle real-time traffic data for a city?","Describe a challenging technical problem you faced and how you solved it.","Explain the principles of distributed systems and their application in our services."]}}
- {"location":"London, UK","differences":{"tips":["Research BP's operations in the UK and Europe.","Be ready to talk about your contributions to team success and collaboration.","Showcase your ability to adapt to new technologies and methodologies."],"interviewFocus":["Strong understanding of object-oriented programming principles","Experience with agile methodologies and TDD","Knowledge of cybersecurity best practices"],"commonQuestions":["Discuss your experience with microservices architecture and its benefits.","How do you ensure code quality and maintainability in a large codebase?","Explain the trade-offs between different database technologies (SQL vs. NoSQL)."]}}
- {"location":"Singapore","differences":{"tips":["Understand BP's global presence and its impact on the energy industry.","Prepare examples that demonstrate leadership potential.","Be curious and ask insightful questions about the role and the company."],"interviewFocus":["Problem-solving and analytical skills","Communication and collaboration abilities","Understanding of BP's business context and industry trends"],"commonQuestions":["Describe a situation where you had to influence a technical decision.","How do you approach debugging complex issues in a production environment?","What are your thoughts on the future of AI in the energy sector?"]}}

## Round 1: HR Screening
**Type:** HR Screening · **Difficulty:** Easy · **Duration:** 30 min
HR screening to assess cultural fit and basic qualifications.
This initial round is conducted by an HR representative to assess your overall fit with BP's culture and values. They will review your resume, discuss your career aspirations, and ask behavioral questions to understand your past experiences and how you handle various work situations. It's also an opportunity for you to learn more about BP and the role.
**Interviewers look for:** Enthusiasm for the role and BP.; Clear communication.; Basic alignment with company values.
**Evaluation criteria:** Basic understanding of resume and experience.; Communication skills.; Cultural fit assessment.
**Common rejection reasons:** Poor communication skills.; Inability to articulate thought process.; Lack of basic understanding of CS fundamentals.
## Questions

- Why are you interested in this role at BP?
- Tell me about a time you worked effectively in a team.
- What are your salary expectations?

## Preparation tips

- Be prepared to talk about your resume and why you are interested in BP.
- Research BP's mission, vision, and values.
- Practice answering behavioral questions using the STAR method.

## Round 2: Coding Interview
**Type:** Data Structures and Algorithms Interview · **Difficulty:** Medium · **Duration:** 60 min
Technical interview focusing on coding and problem-solving with data structures and algorithms.
This is a technical interview focused on your core programming skills. You will be asked to solve coding problems, typically involving data structures and algorithms. The interviewer will assess your ability to write clean, efficient code and explain your thought process clearly. Expect questions on topics like arrays, strings, trees, graphs, sorting, and searching.
**Interviewers look for:** Logical approach to problem-solving.; Clean and efficient code.; Understanding of time and space complexity.; Ability to communicate technical solutions.
**Evaluation criteria:** Problem-solving skills.; Algorithmic thinking.; Data structure knowledge.; Coding proficiency.; Ability to explain code and logic.
**Common rejection reasons:** Inability to solve coding problems efficiently.; Poor code quality.; Lack of understanding of algorithms and data structures.; Difficulty in explaining the solution.
## 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.

## Preparation tips

- Practice coding problems on platforms like LeetCode or HackerRank.
- Review fundamental data structures and algorithms.
- Understand time and space complexity analysis (Big O notation).
- Practice explaining your solutions out loud.

## Round 3: System Design Interview
**Type:** System Design Interview · **Difficulty:** Hard · **Duration:** 60 min
Assesses ability to design scalable and robust software systems.
This round evaluates your ability to design and architect software systems. You'll be presented with a high-level problem (e.g., design Twitter, design a URL shortener) and expected to break it down, discuss requirements, propose a design, and justify your choices. Focus on scalability, reliability, and trade-offs.
**Interviewers look for:** Ability to design complex systems from scratch.; Understanding of trade-offs in design choices.; Knowledge of various architectural patterns.; Consideration for reliability, availability, and maintainability.
**Evaluation criteria:** System design capabilities.; Scalability and performance considerations.; Understanding of distributed systems.; Database design and selection.; API design.; Trade-off analysis.
**Common rejection reasons:** Lack of understanding of system design principles.; Inability to design scalable and reliable systems.; Poor trade-off analysis.; Not considering edge cases or failure scenarios.
## Questions

- Design a system like Instagram.
- How would you design a rate limiter?
- Design a distributed cache.

## Preparation tips

- Study common system design patterns and architectures.
- Understand concepts like load balancing, caching, databases, message queues.
- Practice designing popular systems.
- Be prepared to discuss trade-offs for each design decision.

## Round 4: Behavioral and Managerial Interview
**Type:** Behavioral Interview · **Difficulty:** Medium · **Duration:** 45 min
Assesses behavioral competencies, teamwork, and cultural fit.
This interview focuses on your behavioral competencies and how you approach various work situations. You'll be asked questions about your past experiences, leadership style, conflict resolution, and how you handle challenges. The goal is to understand how you work within a team and align with BP's culture.
**Interviewers look for:** Examples of leadership and initiative.; How candidates handle challenges and failures.; Collaboration and communication style.; Motivation and passion for technology and BP.
**Evaluation criteria:** Behavioral competencies.; Teamwork and collaboration.; Problem-solving approach in real-world scenarios.; Adaptability and learning agility.; Alignment with BP's core values.
**Common rejection reasons:** Lack of alignment with company values.; Poor conflict resolution skills.; Inability to demonstrate leadership or initiative.; Negative attitude or lack of enthusiasm.
## Questions

- Tell me about a time you failed and what you learned from it.
- Describe a situation where you had to influence a technical decision.
- How do you prioritize your work when faced with multiple deadlines?

## Preparation tips

- Prepare specific examples using the STAR method for common behavioral questions.
- Think about situations related to teamwork, leadership, problem-solving, and dealing with ambiguity.
- Be ready to discuss your career goals and how this role fits into them.