Scale Engineer

Software Engineer

Software EngineerL2Hard

The Software Engineer interview at Jane Street for an L2 level position is a rigorous process designed to assess a candidate's technical proficiency, problem-solving abilities, and cultural fit within the firm. It typically involves multiple rounds, including technical interviews focusing on data structures, algorithms, and system design, as well as behavioral interviews to gauge teamwork and communication skills. The goal is to identify candidates who can contribute effectively to the firm's trading and technology initiatives.

Rounds·4

Timeline·~14d

Experience·2 - 5 yrs

Comp band·US$110000 - US$150000

Interview time·150 min

Evaluation

What they measure.

  • Problem-solving approach and clarity of thought.
  • Correctness and efficiency of algorithms and data structures.
  • Ability to design scalable and robust systems.
  • Communication skills and ability to articulate technical concepts.
  • Behavioral aspects such as teamwork, adaptability, and learning agility.

Preparation

How to prepare.

Tips

  1. Master fundamental data structures (arrays, linked lists, trees, graphs, hash tables) and algorithms (sorting, searching, dynamic programming, graph traversal).
  2. Practice coding problems on platforms like LeetCode, HackerRank, and AlgoExpert, focusing on medium to hard difficulty.
  3. Study system design principles, including scalability, reliability, and performance optimization.
  4. Review common behavioral interview questions and prepare STAR method (Situation, Task, Action, Result) responses.
  5. Understand the basics of financial markets and trading if interviewing for a trading-related role.
  6. Research Jane Street's culture, values, and recent projects.
  7. Prepare thoughtful questions to ask the interviewers.

Study plan

Fig · Study plan — 06 phases

01 / 06
01

Phase 01 of 06

Data Structures Fundamentals

Weeks 1-2: Data Structures (Arrays, Lists, Trees, Graphs, Hash Tables). Practice implementations and basic problems.

Weeks 1-2: Focus on core data structures like arrays, linked lists, stacks, queues, hash tables, trees (binary trees, BSTs, heaps), and graphs. Practice implementing them and understanding their time and space complexities. Solve problems related to these structures.

Questions

Commonly asked.

  • Given an array of integers, find the contiguous subarray with the largest sum.
  • Design a rate limiter.
  • Explain the difference between a process and a thread.
  • Tell me about a time you failed and what you learned from it.
  • How would you optimize a slow database query?
  • Implement a function to reverse a linked list.
  • Describe the CAP theorem and its implications for distributed systems.
  • What are your strengths and weaknesses?
  • How would you design a system to handle real-time notifications for a social media platform?
  • Write a function to find the k-th smallest element in an unsorted array.

Locations

Regional differences.

Fig · Regions — 03 locations

01 / 03

Location

New York

Interview focus

Emphasis on low-latency systems and performance optimization.Understanding of financial markets and trading concepts is a plus.Adaptability to fast-paced, dynamic environments.

Common questions

  • Discuss a time you had to debug a complex system. What was your approach?
  • How would you design a system to handle real-time stock price updates for a large number of users?
  • Explain the trade-offs between different database technologies for a high-frequency trading application.

Tips

  • Familiarize yourself with common trading strategies and financial instruments.
  • Be prepared to discuss your experience with high-performance computing and distributed systems.
  • Highlight any experience with C++, Java, or Python in a performance-critical context.

Rounds

Round-by-round.

Expand a step for evaluation criteria, sample questions, and prep notes.

DSA

Coding questions at Jane Street.

Frequently reported on Jane Street loops

View all at Jane Street

Other guides

More at Jane Street.