# Software Engineer
**Role:** Software Engineer · **Level:** Principal Software Architect
**Company:** [FactSet](https://scaleengineer.com/companies/factset)
**Difficulty:** Very High
**Salary:** US$180000 - US$250000
**Experience:** 10 - 15
**Timeline:** ~14 days
FactSet is seeking a Principal Software Architect with a strong background in designing and implementing complex, scalable, and robust software solutions. This role requires deep technical expertise, leadership capabilities, and a proven track record of mentoring engineering teams. The interview process is designed to assess your architectural vision, problem-solving skills, and ability to drive technical strategy.
Canonical: https://scaleengineer.com/interviews/factset/principal-software-architect-software-engineer
---
## Overall evaluation

- Technical and Leadership Assessment
- Architectural Design and Execution
- Leadership and Collaboration

## Questions asked

- Design a real-time analytics platform for financial market data.
- How would you architect a system to handle millions of concurrent users for a trading application?
- Describe a challenging architectural decision you made and the trade-offs involved.
- How do you ensure code quality and maintainability in a large, distributed system?
- What is your approach to managing technical debt?
- How would you design a system for secure and efficient data sharing between multiple financial institutions?
- Discuss your experience with CI/CD pipelines and infrastructure as code.
- How do you mentor and grow engineering talent within a team?
- What are the key considerations when migrating a monolithic application to microservices?
- How do you handle failure scenarios in a distributed system?

## Preparation tips

### lists

- Thoroughly review FactSet's products and services to understand our business context.
- Brush up on core computer science fundamentals, data structures, and algorithms.
- Deep dive into system design principles, distributed systems, and cloud architecture (AWS, Azure, GCP).
- Prepare to discuss your experience with various programming languages and technologies relevant to FactSet's stack.
- Practice articulating your thought process and decision-making for complex technical challenges.
- Review common behavioral interview questions and prepare STAR method responses.
- Familiarize yourself with architectural patterns like microservices, event-driven architecture, and domain-driven design.
- Understand concepts related to scalability, performance, security, and reliability.
- Prepare questions to ask the interviewers about the role, team, and company culture.

### studyPlan

- {"title":"Foundational Knowledge","longDescription":"Weeks 1-2: Focus on foundational computer science concepts, data structures, and algorithms. Review common design patterns and object-oriented principles. Understand the basics of operating systems and networking.","shortDescription":"Weeks 1-2: CS Fundamentals, DS&A, Design Patterns, OS, Networking."}
- {"title":"System Design and Architecture","longDescription":"Weeks 3-5: Deep dive into system design principles. Study distributed systems, microservices architecture, message queues, databases (SQL/NoSQL), caching strategies, and API design. Explore cloud computing platforms (AWS/Azure/GCP) and their services.","shortDescription":"Weeks 3-5: System Design, Distributed Systems, Cloud Architecture, Databases, Caching."}
- {"title":"Scalability and Operations","longDescription":"Weeks 6-7: Focus on scalability, performance optimization, security, and reliability. Understand concepts like load balancing, fault tolerance, disaster recovery, monitoring, and logging. Review common security vulnerabilities and mitigation strategies.","shortDescription":"Weeks 6-7: Scalability, Performance, Security, Reliability, Monitoring."}
- {"title":"Behavioral and Leadership Preparation","longDescription":"Weeks 8-9: Prepare for behavioral and leadership questions. Practice using the STAR method to articulate your experiences in problem-solving, teamwork, conflict resolution, and leadership. Reflect on your career achievements and how they align with the Principal Architect role.","shortDescription":"Weeks 8-9: Behavioral Questions, Leadership, STAR Method, Career Reflection."}
- {"title":"Final Preparation","longDescription":"Week 10: Mock interviews and final review. Conduct mock interviews focusing on system design and behavioral questions. Review all prepared materials and refine your answers. Prepare insightful questions to ask the interviewers.","shortDescription":"Week 10: Mock Interviews, Final Review, Question Preparation."}

## Location differences

- {"location":"New York","differences":{"tips":["Be prepared to discuss specific examples of complex systems you've designed and their impact.","Articulate your thought process clearly, especially when discussing trade-offs.","Demonstrate a proactive approach to identifying and mitigating risks.","Showcase your ability to influence and guide technical direction across teams."],"interviewFocus":["Deep dive into distributed systems design and trade-offs.","Assessment of leadership and mentorship capabilities.","Evaluation of strategic thinking and long-term technical vision.","Understanding of operational excellence and site reliability engineering (SRE) principles."],"commonQuestions":["Discuss a time you had to make a significant architectural decision with incomplete information. How did you approach it?","How do you balance technical debt with the need for rapid feature delivery?","Describe your experience with cloud-native architectures and microservices. What are the key challenges and best practices?","How do you ensure the security and compliance of a large-scale system?","What are your strategies for mentoring and developing junior engineers into strong technical leaders?"]}}
- {"location":"London","differences":{"tips":["Highlight your experience with performance tuning and scalability challenges.","Be ready to discuss your approach to managing technical roadmaps.","Emphasize your ability to communicate complex technical concepts to both technical and non-technical stakeholders.","Prepare to share examples of how you've driven significant technical improvements."],"interviewFocus":["Emphasis on system resilience and fault tolerance.","Evaluation of experience with large-scale data processing and analytics.","Assessment of ability to drive technical consensus and overcome organizational challenges.","Understanding of performance optimization techniques."],"commonQuestions":["How do you approach designing for high availability and disaster recovery?","Describe a situation where you had to refactor a legacy system. What was your strategy and what were the outcomes?","What are your thoughts on event-driven architectures versus request-response models?","How do you stay current with emerging technologies and evaluate their potential impact on our business?","How do you foster a culture of innovation and continuous improvement within an engineering team?"]}}

## Round 1: System Architecture Design
**Type:** System Design Interview · **Difficulty:** Very High · **Duration:** 60 min
Design a complex software system, discussing architecture, technologies, and trade-offs.
This round focuses on your ability to design and architect complex software systems. You will be presented with a high-level problem statement and expected to design a complete solution, discussing various components, technologies, trade-offs, and scalability considerations. The interviewer will probe into your design choices and challenge your assumptions.
**Interviewers look for:** A candidate who can design robust, scalable, and maintainable systems.; Someone who can articulate technical trade-offs and justify their decisions.; A leader who can guide technical direction and mentor others.; An individual with a strong understanding of modern technology stacks and best practices.
**Evaluation criteria:** Depth of knowledge in software architecture and design patterns.; Ability to think critically and solve complex problems.; Clarity and structure in communication.; Understanding of distributed systems concepts.; Pragmatism in decision-making.
**Common rejection reasons:** Inability to articulate technical vision clearly.; Lack of depth in system design principles.; Poor understanding of trade-offs in architectural decisions.; Failure to demonstrate leadership potential.; Inability to handle complex problem-solving scenarios.
## Questions

- Design a distributed caching system.
- How would you design a notification service for millions of users?

## Preparation tips

- Practice system design problems extensively.
- Be prepared to draw diagrams and explain your design verbally.
- Think about scalability, reliability, availability, and maintainability.
- Consider different technology choices and their pros/cons.
- Be ready to discuss your past architectural experiences.

## Round 2: Core Technical Skills
**Type:** Technical Coding Interview · **Difficulty:** High · **Duration:** 60 min
Solve coding problems focusing on data structures, algorithms, and efficiency.
This round assesses your fundamental technical skills, including data structures, algorithms, and coding proficiency. You will be asked to solve coding problems, explain your approach, and discuss the time and space complexity of your solutions. Expect questions that test your understanding of core computer science principles and your ability to apply them.
**Interviewers look for:** A candidate with strong coding skills and a solid understanding of computer science fundamentals.; Someone who can translate requirements into efficient code.; An individual who can debug and troubleshoot effectively.; A candidate who demonstrates a passion for technology and continuous learning.
**Evaluation criteria:** Proficiency in core programming languages and data structures.; Understanding of algorithms and their complexity.; Problem-solving skills and logical thinking.; Ability to write clean, efficient, and maintainable code.; Familiarity with relevant technologies (e.g., databases, APIs, cloud services).
**Common rejection reasons:** Lack of depth in specific technical areas.; Inability to explain complex technical concepts clearly.; Poor problem-solving approach.; Not demonstrating sufficient experience with relevant technologies.; Difficulty in adapting to new technical challenges.
## Questions

- Implement a function to find the k-th largest element in an unsorted array.
- Given a binary tree, find the lowest common ancestor of two given nodes.

## Preparation tips

- Practice coding problems on platforms like LeetCode, HackerRank, or AlgoExpert.
- Review common data structures (arrays, linked lists, trees, graphs, hash maps) and algorithms (sorting, searching, dynamic programming).
- Understand Big O notation for analyzing algorithm efficiency.
- Be prepared to explain your code and thought process clearly.
- Practice coding in a collaborative environment (e.g., using a shared editor).

## Round 3: Leadership and Behavioral Assessment
**Type:** Behavioral and Leadership Interview · **Difficulty:** High · **Duration:** 45 min
Assess leadership, teamwork, and behavioral fit through past experiences.
This round focuses on your leadership, teamwork, and behavioral aspects. You'll be asked questions about your past experiences, how you handle challenges, manage teams, resolve conflicts, and contribute to a positive work environment. The interviewer aims to understand your leadership style and how you would fit into the FactSet culture.
**Interviewers look for:** A candidate who can lead and inspire engineering teams.; Someone who can collaborate effectively across different functions.; An individual who demonstrates strong communication and interpersonal skills.; A person who aligns with FactSet's culture and values.
**Evaluation criteria:** Leadership and team management capabilities.; Communication and interpersonal skills.; Problem-solving and decision-making in a team context.; Cultural fit and alignment with FactSet's values.; Motivation and career aspirations.
**Common rejection reasons:** Poor communication skills.; Inability to articulate past experiences effectively.; Lack of leadership or mentorship examples.; Not demonstrating cultural fit or alignment with company values.; Negative attitude or lack of enthusiasm.
## Questions

- Tell me about a time you had to lead a team through a difficult technical challenge.
- How do you handle disagreements within your team?

## Preparation tips

- Prepare examples using the STAR method (Situation, Task, Action, Result) for common behavioral questions.
- Reflect on your leadership experiences, including mentoring, conflict resolution, and project management.
- Be ready to discuss your strengths and weaknesses.
- Showcase your passion for technology and your desire to contribute to FactSet's success.
- Research FactSet's company culture and values.

## Round 4: Executive Vision and Strategy
**Type:** Executive / Strategic Interview · **Difficulty:** High · **Duration:** 45 min
Discuss strategic thinking, business alignment, and long-term technical vision with senior leadership.
This final round is with senior leadership, often the VP of Engineering or CTO. The discussion will be high-level, focusing on your strategic thinking, business acumen, and how you envision contributing to FactSet's long-term technical vision. You'll have the opportunity to ask strategic questions about the company's direction.
**Interviewers look for:** A strategic thinker who can influence the company's technical direction.; Someone who understands the business impact of technology decisions.; A candidate who can operate at a senior level and contribute to high-level strategy.; An individual who embodies FactSet's values and contributes to its success.
**Evaluation criteria:** Strategic thinking and business acumen.; Ability to align technical strategy with business objectives.; Understanding of the financial services industry.; Executive presence and communication.; Overall fit for the Principal Architect role.
**Common rejection reasons:** Lack of strategic vision.; Inability to connect technical solutions to business goals.; Poor understanding of the company's market and challenges.; Failure to demonstrate executive presence.; Unrealistic expectations regarding role or compensation.
## Questions

- What are the biggest technological challenges facing the financial services industry today, and how should FactSet address them?
- How would you foster innovation within a large engineering organization?

## Preparation tips

- Understand FactSet's business model, market position, and strategic goals.
- Think about how technology can drive business value.
- Prepare to discuss your vision for the future of software architecture.
- Be ready to articulate your leadership philosophy at an executive level.
- Have thoughtful questions prepared for senior leadership.