# Lead Developer
**Role:** Software Engineer · **Level:** I
**Company:** [BNY Mellon](https://scaleengineer.com/companies/bny-mellon)
**Difficulty:** Hard
**Salary:** US$140000 - US$180000
**Experience:** 5 - 10
**Timeline:** ~15 days
This interview process is for a Lead Developer position at BNY Mellon, focusing on assessing technical leadership, problem-solving skills, and experience in guiding development teams. The level is I, indicating a mid-to-senior level role.
Canonical: https://scaleengineer.com/interviews/bny-mellon/i-software-engineer
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## Overall evaluation

- Technical Skills & Problem Solving
- Leadership & Management
- Behavioral & Cultural Fit

## Questions asked

- Describe a time you had to lead a team through a significant technical challenge. What was your approach, and what was the outcome?
- How do you ensure the quality and maintainability of code produced by your team?
- Walk me through the design of a scalable and resilient system you've worked on.
- How do you handle disagreements within your team regarding technical direction?
- Tell me about a time you had to mentor a junior developer. What was your strategy?
- What are your strategies for managing technical debt while delivering new features?
- How do you stay current with emerging technologies and encourage your team to do the same?
- Describe a situation where you had to influence stakeholders to adopt a new technology or process.
- What are your thoughts on microservices vs. monolithic architectures in the context of financial services?
- How do you approach performance optimization in a distributed system?
- Explain your experience with CI/CD pipelines and DevOps practices.
- How do you foster a culture of innovation within your team?

## Preparation tips

### lists

- Thoroughly review your resume and be prepared to discuss every project and responsibility in detail.
- Brush up on core computer science concepts: data structures, algorithms, operating systems, and databases.
- Practice coding problems, focusing on efficiency and clarity.
- Prepare for system design questions, thinking about scalability, reliability, and trade-offs.
- Research BNY Mellon's business, values, and recent news to tailor your answers.
- Prepare specific examples using the STAR method (Situation, Task, Action, Result) for behavioral questions.
- Understand common leadership scenarios and how you would approach them.
- Be ready to discuss your experience with cloud technologies (AWS, Azure, GCP) and DevOps practices.
- Familiarize yourself with the specific technologies mentioned in the job description.
- Prepare thoughtful questions to ask the interviewer about the role, team, and company culture.

### studyPlan

- {"title":"Data Structures and Algorithms","longDescription":"Weeks 1-2: Focus on core data structures (arrays, linked lists, trees, graphs, hash maps) and algorithms (sorting, searching, dynamic programming, graph traversal). Practice implementing these in your primary programming language. Review Big O notation for time and space complexity analysis.","shortDescription":"Weeks 1-2: Data Structures & Algorithms. Practice coding and complexity analysis."}
- {"title":"System Design","longDescription":"Weeks 3-4: Dive into system design principles. Study topics like load balancing, caching, database design (SQL vs. NoSQL), message queues, microservices architecture, and API design. Practice designing common systems like Twitter feed, URL shortener, or a ride-sharing service.","shortDescription":"Weeks 3-4: System Design. Study scalability, reliability, and common architectural patterns."}
- {"title":"Behavioral and Leadership","longDescription":"Week 5: Prepare for behavioral questions. Identify key leadership, teamwork, and problem-solving scenarios from your past experience. Structure your answers using the STAR method. Research BNY Mellon's values and prepare examples that align with them.","shortDescription":"Week 5: Behavioral Preparation. Use STAR method and align with company values."}
- {"title":"Technology Stack and Questions","longDescription":"Week 6: Review specific technologies relevant to the role (e.g., Java, Python, Spring Boot, React, Docker, Kubernetes, AWS). Refresh your knowledge on best practices, design patterns, and testing strategies. Prepare questions for the interviewer.","shortDescription":"Week 6: Technology Refresh & Questions. Review tech stack and prepare questions."}

## Location differences

- {"location":"London","differences":{"tips":["Highlight instances where you've successfully led a team through complex projects.","Be prepared to discuss your mentoring philosophy and provide specific examples.","For London, research current financial regulations relevant to our business.","For New York, emphasize your experience with remote and hybrid team collaboration tools and strategies.","Showcase your ability to balance innovation with maintainability.","For Dublin, be ready to discuss your practical experience with AWS services and microservices architecture."],"interviewFocus":["Leadership and team management","Mentorship and guidance","Understanding of financial regulations (London)","Adaptability to hybrid work models (New York)","Technical debt management","Cloud-native technologies (Dublin)"],"commonQuestions":["How would you handle a conflict within your team regarding technical direction?","Describe a time you had to mentor a junior developer. What was your approach?","In our London office, there's a strong emphasis on regulatory compliance. How do you ensure your team's work adheres to financial regulations like MiFID II or GDPR?","What are your strategies for fostering a collaborative environment in a hybrid work setting, common in our New York hub?","How do you prioritize technical debt reduction while still delivering new features?","Discuss your experience with cloud-native architectures, particularly relevant for our teams leveraging AWS in our Dublin site."]}}
- {"location":"New York","differences":{"tips":["Prepare detailed examples of complex technical challenges you've overcome.","Be ready to whiteboard system designs and explain trade-offs.","Demonstrate a proactive approach to learning and skill development.","Focus on your experience with high-throughput, low-latency systems.","Emphasize your ability to design for fault tolerance and high availability.","Provide specific examples of how you've influenced technical decisions."],"interviewFocus":["Technical depth and breadth","Problem-solving and analytical skills","Continuous learning and adaptability","System design and architecture","Scalability and performance","Influence and communication"],"commonQuestions":["How do you ensure code quality and maintainability across a large codebase?","Describe a challenging technical problem you solved and your thought process.","How do you stay updated with the latest technologies and industry trends?","What is your experience with performance optimization in distributed systems?","How do you approach designing scalable and resilient systems?","Tell me about a time you had to influence stakeholders to adopt a new technology or approach."]}}
- {"location":"Dublin","differences":{"tips":["Share examples of initiatives you've led to drive innovation.","Be prepared to discuss your role in implementing or improving Agile processes.","Highlight your commitment to code quality and your methods for ensuring it.","Showcase your ability to manage project risks and communicate effectively.","Detail your experience with building and maintaining CI/CD pipelines.","Articulate your reasoning for architectural choices, considering the financial services context."],"interviewFocus":["Innovation and creativity","Agile practices and process improvement","Code quality and best practices","Project management and stakeholder communication","DevOps and automation","Architectural decision-making"],"commonQuestions":["How do you foster innovation within a development team?","Describe your experience with Agile methodologies and how you've adapted them.","What are your strategies for effective code reviews?","How do you handle project scope changes and manage stakeholder expectations?","Discuss your experience with CI/CD pipelines and DevOps practices.","What are your thoughts on microservices vs. monolithic architectures in the context of financial services?"]}}

## Round 1: HR Screening Call
**Type:** HR Screening · **Difficulty:** Medium · **Duration:** 45 min
HR screens candidates for cultural fit, motivation, and basic qualifications.
This initial round is conducted by an HR representative to assess your overall fit with BNY Mellon's culture and values. They will discuss your career aspirations, motivation for applying, and provide an overview of the company and the role. Expect questions about your background, strengths, weaknesses, and why you are interested in BNY Mellon. This is also an opportunity for you to ask initial questions about the company and the recruitment process.
**Interviewers look for:** Clear and concise communication.; Positive attitude.; Basic alignment with company values.; Genuine interest in the position.
**Evaluation criteria:** Communication skills; Basic understanding of role-relevant technologies; Cultural fit; Enthusiasm for the role and company
**Common rejection reasons:** Lack of clear communication.; Inability to articulate technical decisions.; Poor understanding of fundamental concepts.; Negative attitude towards feedback.
## Questions

- Tell me about yourself.
- Why are you interested in this role at BNY Mellon?
- What are your strengths and weaknesses?
- Where do you see yourself in 5 years?
- Describe a challenging situation you faced at work and how you overcame it.

## Preparation tips

- Research BNY Mellon's mission, values, and recent achievements.
- Prepare to talk about your career goals and how this role aligns with them.
- Practice answering common behavioral questions using the STAR method.
- Be ready to articulate why you want to work at BNY Mellon.
- Prepare a few questions to ask the recruiter about the company culture, team, or the next steps in the process.

## Round 2: Coding and Algorithms Interview
**Type:** Technical Interview (Coding) · **Difficulty:** Hard · **Duration:** 60 min
Assess coding proficiency, data structures, and algorithms knowledge.
This round focuses on your core technical skills, particularly in data structures and algorithms. You will be given one or two coding problems to solve, typically on a shared online editor. The interviewer will assess your ability to understand the problem, devise an efficient solution, write clean code, and explain your reasoning. Expect questions that test your knowledge of arrays, strings, trees, graphs, dynamic programming, and sorting/searching algorithms. You'll also be asked about the time and space complexity of your solutions.
**Interviewers look for:** Clean, efficient, and well-structured code.; Logical and systematic approach to problem-solving.; Clear explanation of thought process and trade-offs.; Ability to handle follow-up questions and edge cases.; Understanding of algorithmic complexity.
**Evaluation criteria:** Proficiency in coding.; Knowledge of data structures and algorithms.; Problem-solving approach.; Code clarity and efficiency.; Ability to analyze time and space complexity.
**Common rejection reasons:** Inability to solve coding problems efficiently.; Poor understanding of data structures and algorithms.; Code quality issues (e.g., lack of comments, poor variable naming).; Difficulty explaining thought process.; Not handling edge cases or constraints.
## Questions

- Given an array of integers, find the contiguous subarray with the largest sum.
- Implement a function to check if a binary tree is a valid Binary Search Tree.
- Find the k-th smallest element in a Binary Search Tree.
- Given a string, find the length of the longest substring without repeating characters.
- Design and implement a data structure that supports insert, delete, search, and getRandom in O(1) average time.

## Preparation tips

- Practice coding problems on platforms like LeetCode, HackerRank, or AlgoExpert.
- Focus on understanding the underlying data structures and algorithms.
- Practice explaining your thought process out loud as you code.
- Pay attention to code style, variable naming, and comments.
- Be prepared to discuss edge cases and constraints.
- Review Big O notation for analyzing algorithm efficiency.

## Round 3: System Design Interview
**Type:** Technical Interview (System Design) · **Difficulty:** Hard · **Duration:** 60 min
Assess system design skills, architectural thinking, and understanding of distributed systems.
This round evaluates your ability to design complex, scalable, and reliable software systems. You'll be presented with a high-level problem (e.g., design a URL shortener, a social media feed, or a distributed cache) and expected to break it down, discuss various components, data storage options, APIs, and potential bottlenecks. The focus is on your architectural thinking, understanding of distributed systems principles, and ability to make informed trade-offs.
**Interviewers look for:** Ability to design complex systems from scratch.; Knowledge of architectural patterns and components.; Consideration of non-functional requirements.; Clear articulation of design decisions and trade-offs.; Pragmatic approach to problem-solving.
**Evaluation criteria:** System design capabilities.; Understanding of distributed systems.; Scalability and performance considerations.; Reliability and fault tolerance.; Trade-off analysis.; API design.
**Common rejection reasons:** Inability to design scalable and reliable systems.; Poor understanding of distributed systems concepts.; Lack of consideration for trade-offs.; Not addressing requirements like availability, latency, and consistency.; Weak communication of design choices.
## Questions

- Design a system like Twitter's news feed.
- How would you design a rate limiter for an API?
- Design a distributed key-value store.
- How would you design a system to handle real-time analytics for millions of users?
- Design a URL shortening service like bit.ly.

## Preparation tips

- Study common system design patterns and concepts (e.g., load balancing, caching, databases, message queues).
- Practice designing systems like Twitter, Instagram, Uber, etc.
- Understand the trade-offs between different technologies and approaches.
- Consider non-functional requirements like scalability, availability, latency, and consistency.
- Be prepared to draw diagrams and explain your design choices clearly.
- Review BNY Mellon's technology stack and consider how it might apply.

## Round 4: Leadership and Management Interview
**Type:** Managerial / Leadership Interview · **Difficulty:** Hard · **Duration:** 45 min
Assess leadership, team management, and strategic thinking skills.
This round focuses on your leadership capabilities, team management experience, and strategic thinking. The interviewer will delve into your experience leading development teams, mentoring engineers, handling conflicts, and driving projects to completion. Expect questions about your leadership style, how you foster collaboration, manage performance, and make critical technical decisions. They will also assess your ability to align technical strategy with business goals.
**Interviewers look for:** Demonstrated leadership qualities.; Ability to motivate and guide a team.; Experience in making technical and strategic decisions.; Effective communication and interpersonal skills.; Proactive approach to problem-solving and team development.
**Evaluation criteria:** Leadership and team management abilities.; Mentorship and coaching skills.; Strategic thinking and decision-making.; Conflict resolution.; Communication and influence.; Project oversight.
**Common rejection reasons:** Lack of leadership experience or potential.; Poor conflict resolution skills.; Inability to articulate strategic vision.; Difficulty managing team dynamics or performance.; Poor stakeholder management.
## Questions

- Describe your leadership style and how you adapt it to different team members.
- How do you handle a situation where team members have conflicting technical opinions?
- Tell me about a time you had to deliver difficult feedback to a team member.
- How do you foster a culture of continuous learning and improvement within your team?
- What is your approach to project planning and execution as a lead?

## Preparation tips

- Prepare specific examples of your leadership experience using the STAR method.
- Think about your leadership philosophy and how you motivate teams.
- Be ready to discuss how you handle underperformance or conflicts within a team.
- Consider how you delegate tasks and empower team members.
- Prepare examples of strategic technical decisions you've made.
- Understand how to balance team needs with project deadlines and business objectives.