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Lauri Ojala Interview Preparation
Medium-HardEducation/ Teaching/ Training, Consulting · New York, United States
PhD Economics candidate at Columbia University, specializing in labor and personnel economics and active research on labor markets and organizations.
About Lauri Ojala
PhD Economics candidate at Columbia University, specializing in labor and personnel economics and active research on labor markets and organizations.
New York, United States
Interview Rounds4
1
Online Assessment60–90 min
2–3 DSA coding problems on HackerRank, CodeSignal, or company platform
2
Technical Interview I45–60 min
Data structures & algorithms — arrays, trees, graphs, dynamic programming
3
Technical Interview II45–60 min
System design or low-level design — scalability, APIs, databases
4
HR / Culture Round30 min
Career goals, teamwork, strengths/weaknesses, role expectations
Practice Questions10
Key Topics
- Data Structures & Algorithms150q
- System Design50q
- Object-Oriented Design40q
- SQL & Databases25q
- CS Fundamentals (OS, Networking)25q
Expert Tips
- Practice LeetCode easy and medium problems before the OA — focus on arrays, strings, trees, and graphs.
- For system design, use the RESHADED framework: Requirements, Estimation, Storage, High-level design, APIs, Detailed design, Evaluation.
- Prepare 3–4 STAR stories covering: a challenge you solved, a time you worked in a team, a project you owned end-to-end.
- After every coding solution, proactively state the time and space complexity — interviewers expect it.
- Study common CS fundamentals: process vs thread, TCP vs UDP, REST vs GraphQL, SQL indexing, CAP theorem.