Technical

Focus: Coding and programming (CodeSignal platform).

Language: Java was used across three levels of complexity.

Start with a brute force approach.

Progress to an optimized and scalable solution.

Implement modular code that adheres to best practices and supports extensions.

Mindset:

Prioritize a user-centric approach.

Clearly explain technical concepts and tradeoffs.

Address edge cases effectively and ensure robust commenting in the code.

Adaptability: Follow directions when given, or pivot confidently if a different approach is needed.

System Design

Platform: Zoom whiteboard or CodeSignal whiteboard.

Key Aspects:

Define the scope of the problem and outline the necessary solutions.

Emphasize key design principles: complexity, resilience, scalability, and domain-specific concepts.

Provide a clear rationale for the chosen design and evaluate tradeoffs.

Framework:

Use a 3-tier architecture: APIs, infrastructure, app development, UI, and databases.

Develop solutions where components build on top of one another (e.g., a banking app solution).

Documentation:

Include SQL/NoSQL choices, justify decisions, and adhere to SOLID principles.

Apply architectural patterns such as microservices (minimum two patterns).

Behavioral

Alignment with Capital One Culture:

Demonstrate strong communication, teamwork, and core competencies.

Use the STAR method (Situation, Task, Action, Result) to answer 3–4 behavioral questions.

Key Themes:

Take the initiative to improve processes.

Deliver results with a solution-focused mindset.

Common Questions:

“Why Capital One?”

“What intrigues you about this position?”

Case Interview

Focus: Problem-solving skills.

Approach:

Follow a step-by-step thought process to break down the problem.

Collaborate with a lead to devise a feasible solution.

Tools: Use paper and pen to jot down questions and information.

Evaluation:

Provide an opinion on the approach, assess pros and cons, and perform relevant mathematical calculations.

Debug code for issues or insufficiencies and provide logical recommendations for improvement.

Case interview about VCN

Handout 1: Virtual Credit Card Number Validation Rules

Similar to credit card numbers, the digits in virtual card numbers and associated transaction numbers may seem random, but they actually carry meaning.

When a Capital One Virtual Credit Card is used, the data must be validated against certain business rules to arrive at a spend decision.

These rules are applied to specific digits in the VCN and transaction ID.

Each transaction made with a VCN is assigned a unique eight (8) digit transaction ID.