A Software Engineer at Root plays a pivotal role in shaping the technological landscape of the company. This position is essential for developing scalable software solutions that enhance user experiences and drive business innovation. As part of a dynamic team, you will be responsible for designing, building, and maintaining applications that directly impact how customers interact with Root's insurance products and services. The work you do as a Software Engineer at Root is critical, not only for product development but also for establishing the company as a leader in the insurtech space. You will collaborate closely with cross-functional teams, including product managers and designers, to tackle complex challenges and deliver high-quality software that meets user needs. The position offers an opportunity to work on diverse projects, from backend services to mobile applications, all while contributing to a mission-driven environment that values creativity and efficiency.
Phone Screen
reportedNon-technical phone screen with a recruiter to assess initial fit.
What to demonstrate
- Non-technical phone screen with a recruiter to assess initial fit
- Depth in Object-Oriented Programming (OOP)
How to prepare
- Be able to walk your CV end to end in two minutes, and say why this company specifically.
- Have your salary expectations, notice period and location constraints ready, and ask for the rest of the loop in writing.
Coding Assessment
reportedSelf-paced coding assessment to evaluate your technical skills.
What to demonstrate
- Self-paced coding assessment to evaluate your technical skills
- Depth in Object-Oriented Programming (OOP)
How to prepare
- Answer aloud and timed: Describe a time when you had to optimize an algorithm for performance.
- Answer aloud and timed: What are the differences between synchronous and asynchronous programming?
Technical Phone Interview
reportedInterview with two engineers focusing on coding skills and problem-solving.
What to demonstrate
- Interview with two engineers focusing on coding skills and problem-solving
- Depth in Object-Oriented Programming (OOP)
How to prepare
- Answer aloud and timed: Can you explain how RESTful APIs work and their significance in software development?
- Answer aloud and timed: Design a system that can handle real-time data processing for a mobile application.
Onsite Interview
reportedMultiple technical assessments including pair programming and architecture discussion.
What to demonstrate
- Multiple technical assessments including pair programming and architecture discussion
- Depth in Object-Oriented Programming (OOP)
How to prepare
- Answer aloud and timed: How would you approach scaling a web service to handle increased traffic?
- Answer aloud and timed: Discuss the trade-offs between microservices and monolithic architecture.
PracHub editorial advice for the preparation topics above.
Practice coding challenges
Focus on common algorithms and data structures, as these are frequently tested during technical interviews.
Understand Root’s products
Familiarize yourself with Root's offerings and how technology plays a role in enhancing customer experiences.
Prepare for behavioral questions
Reflect on past experiences that showcase your problem-solving and teamwork abilities, as cultural fit is highly valued.
Clarify your thought process
During technical interviews, articulate your reasoning clearly while coding, as interviewers value transparency in your approach.
Choose a category, try a prompt, then open its approach, worked solution or follow-up when you need it.
What are the differences between synchronous and asynchronous programming?
What are the differences between synchronous and asynchronous programming?
Approach
- Say what the runtime actually does before reasoning about the code.
- Name what is shared across threads and what owns each piece of state.
- Identify the window where an invariant is briefly untrue.
- Distinguish a value from a reference to it, and say which one you handed out.
Follow-up
- What happens if two callers reach this at the same time?
- Where could this allocate more than you expect?
Write a function to reverse a linked list. Explain your approach.
Write a function to reverse a linked list. Explain your approach.
Approach
- Restate the input: its shape, its size, and what is guaranteed about it.
- Name the brute-force solution and its complexity before improving on it.
- Choose the data structure from the access pattern, not from familiarity.
- State the target complexity and say which constraint rules the naive version out.
Follow-up
- How does this change if the input no longer fits in memory?
- What is the worst case, and how likely is it on real data?
Given an array of integers, find the two numbers that add up to a specific target.
Given an array of integers, find the two numbers that add up to a specific target.
Approach
- Restate the input: its shape, its size, and what is guaranteed about it.
- Name the brute-force solution and its complexity before improving on it.
- Choose the data structure from the access pattern, not from familiarity.
- State the target complexity and say which constraint rules the naive version out.
Follow-up
- How does this change if the input no longer fits in memory?
- What is the worst case, and how likely is it on real data?
Implement a function to check if a string is a palindrome.
Implement a function to check if a string is a palindrome.
Approach
- Restate the input: its shape, its size, and what is guaranteed about it.
- Name the brute-force solution and its complexity before improving on it.
- Choose the data structure from the access pattern, not from familiarity.
- State the target complexity and say which constraint rules the naive version out.
Follow-up
- How does this change if the input no longer fits in memory?
- What is the worst case, and how likely is it on real data?
Describe your process for writing unit tests for your code.
Describe your process for writing unit tests for your code.
Approach
- Restate the input: its shape, its size, and what is guaranteed about it.
- Name the brute-force solution and its complexity before improving on it.
- Choose the data structure from the access pattern, not from familiarity.
- State the target complexity and say which constraint rules the naive version out.
Follow-up
- How does this change if the input no longer fits in memory?
- What is the worst case, and how likely is it on real data?
Solve a problem involving data manipulation and provide a detailed explanation of your approach.
Solve a problem involving data manipulation and provide a detailed explanation of your approach.
Approach
- Restate the input: its shape, its size, and what is guaranteed about it.
- Name the brute-force solution and its complexity before improving on it.
- Choose the data structure from the access pattern, not from familiarity.
- State the target complexity and say which constraint rules the naive version out.
Follow-up
- How does this change if the input no longer fits in memory?
- What is the worst case, and how likely is it on real data?
What considerations would you have when designing a database schema for a new application?
What considerations would you have when designing a database schema for a new application?
Approach
- Name the grain you start from and join outward from it.
- Check whether any join is one-to-many before aggregating, or the sums inflate.
- Say which index the query would use, and what makes it unusable.
- Handle the rows that do not match: that is usually the actual question.
Follow-up
- How does the query change if that join becomes one-to-many?
- What happens to this when the table is ten times larger?
Keep soft-deleted accounts from blocking re-registration
app_user holds user_id, tenant_id, email CITEXT, password_hash (NULL for SSO principals), email_verified_at, auth_version, status ('invited','active','suspended','deactivated'), created_at, updated_at, deleted_at. Two live accounts for one address inside a tenant must be impossible, but an address freed by a soft delete must be reusable, and the same tenant may delete and re-register it repeatedly. Write the uniqueness DDL for PostgreSQL 16, then the equivalent for MySQL 8 where partial indexes do not exist, and say what each permits once three deleted rows already hold that address.
Approach
- Start from what is actually unique: not (tenant_id, email), but (tenant_id, email) among live rows. PostgreSQL says that directly — CREATE UNIQUE INDEX app_user_live_email ON app_user (tenant_id, email) WHERE deleted_at IS NULL. A full constraint over the same two columns burns the address permanently the first time someone deletes an account.
- Keep case-insensitivity in the type or the index, never in the application: CITEXT as given, or UNIQUE (tenant_id, lower(email)) as an expression index where the extension is unavailable. A case-sensitive unique column is exactly how two accounts for one human appear.
- For MySQL 8 the predicate has to move inside the key: add a discriminator column that is a constant 0 while the row is live and is set to user_id on delete, with UNIQUE (tenant_id, email, deleted_marker). Live rows share the constant and still collide; deleted rows differ from each other and stop colliding.
- State the NULL variant and its dependency: leaving the marker NULL for deleted rows also works, because a unique index treats NULLs as distinct — true in MySQL, and true in PostgreSQL only under the default NULLS DISTINCT, which PostgreSQL 15 lets you reverse. Check the polarity against the three existing deleted rows: constant-on-live is what preserves the collision you want, and reversing it silently admits duplicate live accounts.
Follow-up
- A deleted account re-registers with the same address the next day. Do the old resource rows follow the new user_id, and how does the API keep the two principals apart?
- How do you honour an erasure request while resource_revision.actor_user_id still references this table?
Explain the principles of Object-Oriented Programming (OOP).
Explain the principles of Object-Oriented Programming (OOP).
Approach
- Clarify what is being asked and what a complete answer contains.
- State your assumptions explicitly before working the problem.
- Say what you would check first and why it is the highest-information step.
- Work from the requirement backwards to the design.
Follow-up
- What assumption would you test first?
- How would you know your answer was wrong?
Can you explain how RESTful APIs work and their significance in software development?
Can you explain how RESTful APIs work and their significance in software development?
Approach
- Clarify what is being asked and what a complete answer contains.
- State your assumptions explicitly before working the problem.
- Say what you would check first and why it is the highest-information step.
- Work from the requirement backwards to the design.
Follow-up
- What assumption would you test first?
- How would you know your answer was wrong?
Design a system that can handle real-time data processing for a mobile application.
Design a system that can handle real-time data processing for a mobile application.
Approach
- Fix the scope first: who calls this, how often, and what they do when it fails.
- Name the read and write paths separately; they rarely have the same bottleneck.
- Choose a partition key and say what query it makes expensive.
- State the consistency you need, and where you are willing to be stale.
Follow-up
- What breaks first when traffic grows ten times?
- How does this behave when that dependency is down for an hour?
How would you approach scaling a web service to handle increased traffic?
How would you approach scaling a web service to handle increased traffic?
Approach
- Fix the scope first: who calls this, how often, and what they do when it fails.
- Name the read and write paths separately; they rarely have the same bottleneck.
- Choose a partition key and say what query it makes expensive.
- State the consistency you need, and where you are willing to be stale.
Follow-up
- What breaks first when traffic grows ten times?
- How does this behave when that dependency is down for an hour?
Discuss the trade-offs between microservices and monolithic architecture.
Discuss the trade-offs between microservices and monolithic architecture.
Approach
- Fix the scope first: who calls this, how often, and what they do when it fails.
- Name the read and write paths separately; they rarely have the same bottleneck.
- Choose a partition key and say what query it makes expensive.
- State the consistency you need, and where you are willing to be stale.
Follow-up
- What breaks first when traffic grows ten times?
- How does this behave when that dependency is down for an hour?
Describe how you would ensure the security of data in your application.
Describe how you would ensure the security of data in your application.
Approach
- Fix the scope first: who calls this, how often, and what they do when it fails.
- Name the read and write paths separately; they rarely have the same bottleneck.
- Choose a partition key and say what query it makes expensive.
- State the consistency you need, and where you are willing to be stale.
Follow-up
- What breaks first when traffic grows ten times?
- How does this behave when that dependency is down for an hour?
Imagine you are tasked with improving the performance of a slow-running application. What steps would you take
Imagine you are tasked with improving the performance of a slow-running application. What steps would you take?
Approach
- Clarify what is being asked and what a complete answer contains.
- State your assumptions explicitly before working the problem.
- Say what you would check first and why it is the highest-information step.
- Work from the requirement backwards to the design.
Follow-up
- What assumption would you test first?
- How would you know your answer was wrong?
How would you handle a situation where the requirements of a project change midway through development?
How would you handle a situation where the requirements of a project change midway through development?
Approach
- Clarify what is being asked and what a complete answer contains.
- State your assumptions explicitly before working the problem.
- Say what you would check first and why it is the highest-information step.
- Work from the requirement backwards to the design.
Follow-up
- What assumption would you test first?
- How would you know your answer was wrong?
Discuss how you would approach a new feature development when you are unfamiliar with the technology stack.
Discuss how you would approach a new feature development when you are unfamiliar with the technology stack.
Approach
- Clarify what is being asked and what a complete answer contains.
- State your assumptions explicitly before working the problem.
- Say what you would check first and why it is the highest-information step.
- Work from the requirement backwards to the design.
Follow-up
- What assumption would you test first?
- How would you know your answer was wrong?
Present a plan for refactoring legacy code while minimizing disruption to ongoing projects.
Present a plan for refactoring legacy code while minimizing disruption to ongoing projects.
Approach
- Clarify what is being asked and what a complete answer contains.
- State your assumptions explicitly before working the problem.
- Say what you would check first and why it is the highest-information step.
- Work from the requirement backwards to the design.
Follow-up
- What assumption would you test first?
- How would you know your answer was wrong?
How do you approach debugging a complex issue in your code?
How do you approach debugging a complex issue in your code?
Approach
- Establish what changed and when, before forming any theory.
- Pick a bisection that eliminates candidates whichever way it turns out.
- Check the instrumentation before believing the symptom.
- Separate the trigger from the cause; the deploy is rarely the bug.
Follow-up
- What would you look at first, and what would it rule out?
- How would you tell a cause from a coincidence here?
Built from the rounds and topics Root candidates report.
Prepare, practise & reflect
One practical outcome each day. Spend longer where you need it.
0 / 7 done01Map the Root loop
- Write out the reported sequence: Phone Screen, Coding Assessment, Technical Phone Interview, Onsite Interview.
- For each round, write one sentence on what it is judging, from the description above, and mark the one you are least ready for.
Deliverable: A one-page map of the 4 reported rounds, with the weakest marked.
02Work Object-Oriented Programming (OOP)
- Spend the session on Object-Oriented Programming (OOP), which Root candidates report being tested on.
- Write one worked example in Object-Oriented Programming (OOP) and time yourself on it.
Deliverable: One timed worked example in Object-Oriented Programming (OOP).
03Work Pair Programming
- Spend the session on Pair Programming, which Root candidates report being tested on.
- Write one worked example in Pair Programming and time yourself on it.
Deliverable: One timed worked example in Pair Programming.
04Work System Architecture / Architecture Interview
- Spend the session on System Architecture / Architecture Interview, which Root candidates report being tested on.
- Write one worked example in System Architecture / Architecture Interview and time yourself on it.
Deliverable: One timed worked example in System Architecture / Architecture Interview.
05Answer out loud: Technical / Domain Questions
- Answer aloud, timed: Explain the principles of Object-Oriented Programming (OOP).
- Answer aloud, timed: How do you approach debugging a complex issue in your code?
Deliverable: Spoken answers to 2 reported Technical / Domain Questions question(s), under time.
06Answer out loud: System Design / Architecture
- Answer aloud, timed: Design a system that can handle real-time data processing for a mobile application.
- Answer aloud, timed: How would you approach scaling a web service to handle increased traffic?
Deliverable: Spoken answers to 2 reported System Design / Architecture question(s), under time.
07Answer out loud: Behavioral / Leadership
- Answer aloud, timed: Tell me about a time you faced a significant challenge at work and how you overcame it.
- Answer aloud, timed: How do you prioritize tasks when working on multiple projects?
Deliverable: Spoken answers to 2 reported Behavioral / Leadership question(s), under time.
Expand any day for tasks and deliverables. Your progress is saved on this device.
Behavioural rounds judge the decision you made and what it cost.
Describe a time when you had to optimize an algorithm for performance.
Describe a time when you had to optimize an algorithm for performance.
Approach
- Pick a story where you made the decision, not one where you watched it.
- State the situation in two sentences and spend the rest on the reasoning.
- Give the blast radius: what could have broken, and what you measured.
- Name the disagreement and how you resolved it with evidence.
Follow-up
- What would you do differently if you ran that again?
- How did you know your change caused the improvement?
Tell me about a time you faced a significant challenge at work and how you overcame it.
Tell me about a time you faced a significant challenge at work and how you overcame it.
Approach
- Pick a story where you made the decision, not one where you watched it.
- State the situation in two sentences and spend the rest on the reasoning.
- Give the blast radius: what could have broken, and what you measured.
- Name the disagreement and how you resolved it with evidence.
Follow-up
- What would you do differently if you ran that again?
- How did you know your change caused the improvement?
How do you prioritize tasks when working on multiple projects?
How do you prioritize tasks when working on multiple projects?
Approach
- Pick a story where you made the decision, not one where you watched it.
- State the situation in two sentences and spend the rest on the reasoning.
- Give the blast radius: what could have broken, and what you measured.
- Name the disagreement and how you resolved it with evidence.
Follow-up
- What would you do differently if you ran that again?
- How did you know your change caused the improvement?
Describe a situation where you had to work with a difficult colleague and how you handled it.
Describe a situation where you had to work with a difficult colleague and how you handled it.
Approach
- Pick a story where you made the decision, not one where you watched it.
- State the situation in two sentences and spend the rest on the reasoning.
- Give the blast radius: what could have broken, and what you measured.
- Name the disagreement and how you resolved it with evidence.
Follow-up
- What would you do differently if you ran that again?
- How did you know your change caused the improvement?
What motivates you to deliver your best work?
What motivates you to deliver your best work?
Approach
- Pick a story where you made the decision, not one where you watched it.
- State the situation in two sentences and spend the rest on the reasoning.
- Give the blast radius: what could have broken, and what you measured.
- Name the disagreement and how you resolved it with evidence.
Follow-up
- What would you do differently if you ran that again?
- How did you know your change caused the improvement?
How do you incorporate feedback into your development process?
How do you incorporate feedback into your development process?
Approach
- Pick a story where you made the decision, not one where you watched it.
- State the situation in two sentences and spend the rest on the reasoning.
- Give the blast radius: what could have broken, and what you measured.
- Name the disagreement and how you resolved it with evidence.
Follow-up
- What would you do differently if you ran that again?
- How did you know your change caused the improvement?
Describe how you would conduct a code review and the aspects you would focus on.
Describe how you would conduct a code review and the aspects you would focus on.
Approach
- Pick a story where you made the decision, not one where you watched it.
- State the situation in two sentences and spend the rest on the reasoning.
- Give the blast radius: what could have broken, and what you measured.
- Name the disagreement and how you resolved it with evidence.
Follow-up
- What would you do differently if you ran that again?
- How did you know your change caused the improvement?
- 01
Describe a time when you had to optimize an algorithm for performance.
- 02
Tell me about a time you faced a significant challenge at work and how you overcame it.
- 03
How do you prioritize tasks when working on multiple projects?
- 04
Describe a situation where you had to work with a difficult colleague and how you handled it.
How difficult is the interview process for the Software Engineer position?
The interview process is moderately rigorous, with an emphasis on both technical skills and behavioral fit. Candidates typically spend several weeks preparing to ensure they can effectively showcase their capabilities.
Root Software Engineer candidate reports ↗What differentiates successful candidates at Root?
Successful candidates demonstrate a strong technical foundation, excellent problem-solving skills, and the ability to communicate effectively with both technical and non-technical team members.
Root Software Engineer candidate reports ↗What is the culture like at Root?
Root fosters a collaborative and innovative culture that values transparency, teamwork, and a commitment to continuous improvement. Engineers are encouraged to contribute ideas and take ownership of their work.
Root Software Engineer candidate reports ↗How long does the interview process usually take?
The timeline from the initial screening to a potential offer can vary, but candidates typically receive feedback within 1-2 weeks after interviews.
Root Software Engineer candidate reports ↗Are there remote work options available for this role?
Root has embraced flexible work arrangements, and candidates may have the option to work remotely or in a hybrid capacity, depending on team needs.
Root Software Engineer candidate reports ↗What topics does Root test in interviews?
Root interviews most often cover SQL, Experiment Design, Data Interpretation, Behavioral Interviewing, and Predictive Modeling. The exact emphasis depends on the specific role you apply for.
Root Software Engineer candidate reports ↗Sources & methodology 3 sources ↗
No official company page is cited. Rounds and questions come from candidate reports and PracHub editorial material; each source shows the date it was read.
- 01Root Software Engineer candidate reports ↗
Company-reported rounds, questions and FAQ.
Candidate reports · Accessed 2026-09-22 - 02PracHub Software Engineer practice ↗
PracHub practice material, not company-reported.
PracHub page · Accessed 2026-09-22 - 03PracHub preparation framework ↗
PracHub preparation guidance.
PracHub page · Accessed 2026-09-22
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