Visa Interview Experience - SDE-1 Role

Interviewing at Visa was a mix of DSA challenges, graph-based reasoning and behavioral evaluation. The process tested not only coding ability but also how well you can model real-world problems and communicate your thought process. Here’s a detailed breakdown of my rounds.

Round 1: Online Coding Assessment

The first round was a timed online test with four coding problems, increasing in difficulty:

• Q1 & Q2 (Easy): Focused on basics like arrays, strings and number operations.
• Q3 (Medium/Hard): Required careful implementation, handling edge cases.
• Q4 (Hard): Optimization-heavy, designed to test deeper problem-solving under time pressure.

Tip: Pace yourself. Solve the easy ones cleanly, then move to the harder problems with structured thinking.

Round 2: Technical Interview 1

Problem Statement:

Given a list of strings, construct a graph where the last character of one string connects to another string starting with that character. Detect if there's a cycle in the graph.

Example:

Input: `["abc", "def", "cfg", "gza"]`  
Connections: `abc → cfg`, `cfg → gza`, etc.

My Approach:

• Modeled the problem using adjacency lists.
• Implemented cycle detection with DFS.
• Covered disconnected components and edge cases.

The interviewer appreciated the clarity in graph modeling and reasoning.

Round 3: Technical Interview 2

Problem Statement:

Reconstruct a city travel path from given source → destination mappings and identify the true starting city.

Example Input:

Mumbai → Bangalore
Goa → Dehradun
Calcutta → Mumbai
Dehradun → Calcutta

Expected Output:

Goa → Dehradun → Calcutta → Mumbai → Bangalore

My Approach:

• Proposed a graph traversal using DFS.
• Discussed an alternative HashSet-based approach to track unique sources/destinations.
• Talked through edge cases and efficiency.

The interviewer liked the real-world analogy and systematic explanation.

Round 4: Hiring Manager Interview

Questions Asked:

• Why Visa?
• Tell me about a time you made a mistake and what you learned.
• How do you plan to grow in your career?

The manager focused on mindset, adaptability and willingness to upskill.

Overall Experience

Visa's process felt balanced — DSA for coding ability, graph problems for reasoning and behavioral checks for mindset.

Key Takeaways:

• Graphs are critical. Be comfortable modeling real-world problems into graphs (cycle detection, path reconstruction).
• Online test ramps up fast. Don’t rush the easy problems. write clean, correct code before tackling harder ones.
• Behavioral rounds matter. Be honest about growth, mistakes and future aspirations.

Preparation Tips

• Revise graph fundamentals (DFS, cycle detection, topological sort, path reconstruction).
• Practice sliding window, arrays and string problems.
• For behavioral prep, align your answers with continuous learning and ownership.

In Interviews:

• Keep talking, share your thought process.
• Ask clarifying questions.
• Bring up optimizations proactively — shows depth of thinking.

Recommendation

• A Structured Approach to Cracking Technical Interviews
• How to Approach HR Interview Questions
• DSA with Our 80 Coding Problems Sheet – Your Fast-Track to Cracking Tech Interviews