How long does the LSEG interview process take?

Most candidates spend between 4 and 8 weeks from recruiter screen to offer. The onsite loop itself runs in a single day or is split across two half-days, with debrief and offer typically within 5 business days after.

How should I prepare specifically for LSEG?

Focus on three things: (1) the company DNA shown above — what they actually grade for, (2) the rounds in your loop, especially the round most candidates underestimate, and (3) drilling on the question types in this guide using a structured framework like CIRCLES or STAR.

Does this apply to engineering or design roles at LSEG?

The DNA stays the same — what changes is the round mix. SWE candidates face coding screens instead of Product Sense; designers face portfolio reviews and design exercises. The "what they value" and behavioral signals carry across all functions.

Why are you interested in joining LSEG, and what specifically about our software engineering opportunities excites you?

Type: Motivation. Sign up at JobMentis to see the full framework, grading signals, and worked answer for this question.

Given a stream of real-time stock trades (timestamp, symbol, price, quantity), design a data structure and algorithm to efficiently calculate the volume-weighted average price (VWAP) for a given symbol over a specified time window.

Type: Algorithmic. Sign up at JobMentis to see the full framework, grading signals, and worked answer for this question.

Implement a function to find the k-th most frequent element in a list of financial instrument IDs. Assume IDs are strings.

Type: Algorithmic. Sign up at JobMentis to see the full framework, grading signals, and worked answer for this question.

Design a system to detect and flag potentially fraudulent financial transactions in real-time. Consider the scale of LSEG's data.

Type: System Design. Sign up at JobMentis to see the full framework, grading signals, and worked answer for this question.

Write a function to calculate the Sharpe Ratio for a given portfolio's historical returns. Handle potential division by zero and edge cases.

Type: Algorithmic. Sign up at JobMentis to see the full framework, grading signals, and worked answer for this question.

Here is a piece of code that is supposed to calculate the correlation matrix for a set of financial time series. It's producing incorrect results or crashing. Find and fix the bugs.

Type: Debugging. Sign up at JobMentis to see the full framework, grading signals, and worked answer for this question.

Tell me about a time you had a significant disagreement with a cross-functional team member (e.g., engineering, sales, legal) about a product decision. How did you approach it, and what was the outcome?

Type: Conflict Resolution. Sign up at JobMentis to see the full framework, grading signals, and worked answer for this question.

Tell me about a time you had to work with a difficult stakeholder or team member. How did you approach the situation and what was the outcome?

Type: Behavioral. Sign up at JobMentis to see the full framework, grading signals, and worked answer for this question.

Other roles at LSEG:Product Manager Software Engineer IB Analyst Sales

Enterprise · Software Engineer Interview Guide

How to Pass the LSEG Software Engineer Interview in 2026

The LSEG DNA (TL;DR)

LSEG values strong analytical skills, problem-solving, and a deep understanding of financial markets and data. They seek candidates who can collaborate effectively and contribute to building robust financial infrastructure and data solutions like Refinitiv Workspace.

The LSEG Interview Loop

Your onsite loop will typically consist of 5 rounds.

1
Round 1
Recruiter Screen
Motivation, role fit, logistics.
2
Round 2
Coding Screen
LeetCode-medium algorithmic problems under time pressure.
3
Round 3
System Design
Distributed systems, trade-offs at scale, architecture under constraints.
4
Round 4
Onsite Coding
LeetCode-hard, debugging, code clarity, edge cases.
5
Round 5
Behavioral / Leadership
Past evidence of ownership, influence, resolving conflict.

The Danger Zone: Top Reasons Candidates Fail

Based on our database of LSEG interview outcomes, avoid these common traps:

Choosing a single-node cache for a high-throughput system.
Introducing unnecessary complexity.
Using inefficient sorting methods after counting frequencies.
Focusing on persuasion tactics rather than understanding the stakeholder's perspective.

Test Yourself: Real LSEG Questions

Three real prompts pulled from our database.

Type · Behavioral

Tell me about a time you had to make a significant technical decision with incomplete information. How did you mitigate the risks associated with your decision?

Type · System Design

Design a distributed caching system for frequently accessed market data (e.g., current prices, order book snapshots). Discuss cache invalidation strategies.

Type · Conflict Resolution

Tell me about a time you had a significant disagreement with a colleague or manager regarding a sales strategy or approach. How did you resolve it?

+ many more questions, signals, and worked examples

Unlock the rubric →

LSEG Interview Question Bank

A sample from our database, grouped by round. Sign up to see the full set.

9 of 19 questions shown

Recruiter Screen

1
Type · Motivation
Why are you interested in joining LSEG, and what specifically about our software engineering opportunities excites you?

Coding Screen

2
Type · Algorithmic
Given a stream of real-time stock trades (timestamp, symbol, price, quantity), design a data structure and algorithm to efficiently calculate the volume-weighted average price (VWAP) for a given symbol over a specified time window.
3
Type · Algorithmic
Implement a function to find the k-th most frequent element in a list of financial instrument IDs. Assume IDs are strings.
+ 1 more questions in this round (sign up to unlock)

System Design

4
Type · System Design
Design a system to detect and flag potentially fraudulent financial transactions in real-time. Consider the scale of LSEG's data.
5
Type · System Design
Design a distributed caching system for frequently accessed market data (e.g., current prices, order book snapshots). Discuss cache invalidation strategies.
+ 1 more questions in this round (sign up to unlock)

Onsite Coding

6
Type · Algorithmic
Write a function to calculate the Sharpe Ratio for a given portfolio's historical returns. Handle potential division by zero and edge cases.
7
Type · Debugging
Here is a piece of code that is supposed to calculate the correlation matrix for a set of financial time series. It's producing incorrect results or crashing. Find and fix the bugs.
+ 1 more questions in this round (sign up to unlock)

Behavioral / Leadership

8
Type · Conflict Resolution
Tell me about a time you had a significant disagreement with a cross-functional team member (e.g., engineering, sales, legal) about a product decision. How did you approach it, and what was the outcome?
9
Type · Behavioral
Tell me about a time you had to work with a difficult stakeholder or team member. How did you approach the situation and what was the outcome?
+ 7 more questions in this round (sign up to unlock)

Unlock the full LSEG question bank

Free signup, no credit card. You get every question + the framework, grading signals, and worked answer for each.

Unlock all questions →

Interview tracks at LSEG

How LSEG's DNA translates across functions. Pick your role.

SWEs are evaluated on data structures, algorithms, system design, and coding proficiency (Java/Python/C++). LSEG seeks experience with high-performance, low-latency systems, cloud (AWS), and financial data processing, emphasizing scalability and reliability for critical financial applications.

Behavioral

Tell me about a time you had to make a significant technical decision with incomplete information. How did you mitigate the risks associated with your decision?

System Design

Design a distributed caching system for frequently accessed market data (e.g., current prices, order book snapshots). Discuss cache invalidation strategies.

+ 1 more

Unlock the Software Engineer grading rubric for LSEG

See full Software Engineer guide