# Software Engineer
**Role:** Software Engineer · **Level:** Lead Software Engineer
**Company:** [Revolut](https://scaleengineer.com/companies/revolut)
**Difficulty:** Hard
**Salary:** US$130000 - US$180000
**Experience:** 5 - 10
**Timeline:** ~14 days
This interview process is designed to assess candidates for the Lead Software Engineer position at Revolut. It evaluates technical expertise, problem-solving skills, leadership potential, and cultural fit within the company.
Canonical: https://scaleengineer.com/interviews/revolut/lead-software-engineer-software-engineer
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## Overall evaluation

- Technical Skills
- Leadership & Management
- Cultural Fit

## Questions asked

- Design a URL shortening service.
- How would you design a system to handle real-time stock price updates for millions of users?
- Describe a challenging technical problem you solved as a lead engineer.
- How do you ensure code quality and maintainability in a large codebase?
- Tell me about a time you had to manage a conflict within your team.
- What are your thoughts on microservices vs. monolith architecture?
- How do you approach performance optimization in a distributed system?
- What is your experience with cloud infrastructure (AWS/GCP/Azure)?
- How do you mentor and develop junior engineers?
- Describe a situation where you had to make a significant technical decision with incomplete information.

## Preparation tips

### lists

- Thoroughly review data structures and algorithms, focusing on advanced topics and their practical applications.
- Brush up on system design principles, scalability, and distributed systems concepts.
- Prepare to discuss your past projects in detail, highlighting your contributions and technical challenges.
- Understand Revolut's business model, products, and recent news.
- Practice behavioral questions using the STAR method (Situation, Task, Action, Result).
- Be ready to articulate your leadership philosophy and experience mentoring engineers.
- Familiarize yourself with common technologies used at Revolut (e.g., microservices, cloud platforms, specific programming languages).

### studyPlan

- {"title":"Data Structures & Algorithms","longDescription":"Weeks 1-2: Focus on core data structures (trees, graphs, heaps) and algorithms (dynamic programming, graph traversal, sorting). Practice problems on platforms like LeetCode, focusing on medium to hard difficulty. Review time and space complexity analysis.","shortDescription":"Weeks 1-2: Advanced DSA practice (LeetCode Medium/Hard)."}
- {"title":"System Design","longDescription":"Weeks 3-4: Deep dive into system design. Cover topics like scalability, availability, consistency, databases (SQL vs. NoSQL), caching, load balancing, message queues, and microservices architecture. Study common system design interview patterns.","shortDescription":"Weeks 3-4: System Design fundamentals and patterns."}
- {"title":"Behavioral & Leadership","longDescription":"Week 5: Prepare for behavioral and leadership questions. Reflect on your career experiences, focusing on leadership, conflict resolution, project management, and mentoring. Use the STAR method to structure your answers.","shortDescription":"Week 5: Behavioral and Leadership preparation (STAR method)."}
- {"title":"Company & Role Alignment","longDescription":"Week 6: Research Revolut's products, values, and recent developments. Understand the company's mission and how your skills align. Prepare questions to ask the interviewers.","shortDescription":"Week 6: Company research and question preparation."}

## Location differences

- {"location":"London","differences":{"tips":["Research current trends in FinTech and Revolut's specific market position.","Be ready to discuss your experience with financial regulations and compliance.","Highlight any experience with high-frequency trading or payment systems."],"interviewFocus":["Deep understanding of financial technology and its challenges.","Experience with regulatory compliance in the FinTech sector.","Ability to lead technical initiatives in a fast-paced, regulated environment."],"commonQuestions":["How would you mentor junior engineers in a distributed team?","Describe a time you had to influence a team to adopt a new technology. What was the outcome?","In our London office, we often deal with high-volume, low-latency trading systems. Be prepared for questions on concurrency and distributed systems specific to this domain."]}}
- {"location":"Berlin","differences":{"tips":["Showcase your experience with cloud platforms (AWS, GCP, Azure).","Be prepared to discuss your contributions to open-source projects if applicable.","Emphasize your experience with agile methodologies and team collaboration."],"interviewFocus":["Strong experience in building scalable, distributed systems.","Proficiency in modern software development practices and cloud technologies.","Ability to drive technical strategy and mentor engineers in a collaborative setting."],"commonQuestions":["How do you foster innovation within a remote engineering team?","Tell me about a complex system you designed that scaled significantly. What were the key challenges?","In our Berlin office, we emphasize collaboration and agile methodologies. Expect questions on team dynamics and your approach to agile development."]}}
- {"location":"Krakow","differences":{"tips":["Prepare to discuss your experience with various database technologies (SQL, NoSQL).","Highlight projects where you significantly improved system performance or scalability.","Be ready to talk about your approach to code quality and testing."],"interviewFocus":["Expertise in backend development, particularly with large-scale data processing.","Strong understanding of system architecture and performance tuning.","Ability to lead and contribute to the technical roadmap."],"commonQuestions":["How do you handle technical debt in a growing product?","Describe a situation where you had to make a difficult technical trade-off. How did you justify your decision?","In our Krakow office, we focus on robust backend development and data processing. Be ready for in-depth questions on database design and performance optimization."]}}

## Round 1: Coding and Algorithms
**Type:** Technical Interview · **Difficulty:** Medium · **Duration:** 45 min
Coding challenge focusing on data structures and algorithms.
This round focuses on your fundamental programming skills. You will be asked to solve coding problems that test your knowledge of data structures and algorithms. The interviewer will assess your ability to write correct, efficient, and well-structured code, as well as your problem-solving approach and communication skills.
**Interviewers look for:** Logical thinking; Clean and efficient code; Understanding of trade-offs; Ability to explain solutions clearly
**Evaluation criteria:** Problem-solving approach; Coding proficiency; Understanding of data structures and algorithms; Ability to write clean and efficient code
**Common rejection reasons:** Lack of fundamental understanding in core CS concepts.; Inability to articulate thought process clearly.; Poor time complexity analysis.; Difficulty in debugging code.
## Questions

- Given an array of integers, find the contiguous subarray with the largest sum.
- Implement a function to reverse a linked list.
- Find the k-th smallest element in a binary search tree.

## Preparation tips

- Practice coding problems on platforms like LeetCode, HackerRank, or Coderbyte.
- Focus on understanding the time and space complexity of your solutions.
- Be prepared to explain your thought process step-by-step.
- Practice coding in your preferred language and ensure you are comfortable with its standard library.

## Round 2: System Design
**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 and expected to design a scalable, reliable, and maintainable solution. This includes choosing appropriate technologies, defining APIs, designing data models, and considering aspects like performance, availability, and security.
**Interviewers look for:** Ability to design complex systems from scratch; Knowledge of distributed systems patterns; Clear communication of design decisions; Consideration of non-functional requirements
**Evaluation criteria:** System design principles; Scalability and performance; Reliability and fault tolerance; Trade-off analysis; Understanding of various system components
**Common rejection reasons:** Inability to design scalable and reliable systems.; Poor understanding of distributed systems concepts.; Lack of consideration for edge cases and failure scenarios.; Difficulty in explaining design choices and trade-offs.
## Questions

- Design a system like Instagram.
- Design a rate limiter.
- How would you design a distributed key-value store?

## Preparation tips

- Study common system design patterns (e.g., load balancing, caching, message queues).
- Understand trade-offs between different architectural choices.
- Practice designing systems like Twitter feed, URL shortener, or a distributed cache.
- Be prepared to draw diagrams and explain your design clearly.

## Round 3: Behavioral & Leadership
**Type:** Behavioral and Leadership Interview · **Difficulty:** Medium · **Duration:** 45 min
Assesses leadership, teamwork, and cultural fit.
This round focuses on your leadership capabilities, teamwork, and cultural fit. You will be asked behavioral questions about your experience leading teams, managing projects, resolving conflicts, and mentoring engineers. The interviewer will assess your communication style, problem-solving approach in a team setting, and how well you align with Revolut's values.
**Interviewers look for:** Ability to lead and mentor teams; Effective communication; Proactive approach to problem-solving; Alignment with company values
**Evaluation criteria:** Leadership potential; Teamwork and collaboration; Problem-solving in a team context; Communication skills; Cultural fit
**Common rejection reasons:** Lack of leadership experience or potential.; Poor communication or interpersonal skills.; Inability to handle conflict or difficult situations.; Not aligning with Revolut's values or culture.
## Questions

- Tell me about a time you had to lead a team through a difficult project.
- How do you handle disagreements within a team?
- Describe your experience mentoring junior engineers.

## Preparation tips

- Prepare examples using the STAR method for common leadership scenarios.
- Think about your leadership philosophy and how you motivate teams.
- Be ready to discuss how you handle feedback and disagreements.
- Research Revolut's company culture and values.

## Round 4: Strategic Vision & Leadership
**Type:** Managerial / Executive Interview · **Difficulty:** Hard · **Duration:** 60 min
Focuses on strategic thinking and technical vision.
This final round is with senior leadership and focuses on your strategic thinking, technical vision, and ability to align technology with business objectives. You'll discuss your experience in driving technical strategy, managing roadmaps, and influencing product direction. This is also an opportunity for you to ask high-level questions about the company's direction.
**Interviewers look for:** Ability to think long-term; Understanding of business impact; Clear technical roadmap; Effective communication with non-technical stakeholders
**Evaluation criteria:** Strategic thinking; Technical vision; Business acumen; Stakeholder management; Decision-making
**Common rejection reasons:** Lack of strategic thinking.; Inability to align technical decisions with business goals.; Poor communication with stakeholders.; Not demonstrating a clear vision for the team or product.
## Questions

- How would you define the technical roadmap for a new product line?
- Describe a time you had to make a significant technical trade-off that impacted the business.
- What is your vision for the future of software engineering at Revolut?

## Preparation tips

- Think about the long-term technical vision for a product or team.
- Consider how technology decisions impact business goals.
- Prepare to discuss your experience in influencing product strategy.
- Have thoughtful questions ready for senior leadership.