As a Software Engineer at EXOS, you play a vital role in shaping innovative solutions that enhance user experiences and drive business success. Your work will significantly impact a range of products, contributing to the development of state-of-the-art fitness and performance solutions. By leveraging technology to solve complex challenges, you support EXOS in its mission to empower individuals and organizations to reach their full potential. In this role, you will engage with multifaceted systems and work on projects that require both technical acumen and creative problem-solving. You will collaborate closely with cross-functional teams, including product management, design, and data analytics, to build software that not only meets business requirements but also delights users. This is a dynamic and strategic position that offers opportunities to make significant contributions to both the company's products and its overarching goals.
Coding Assessment
reportedCandidates showcase their technical skills through a coding assessment.
What to demonstrate
- Candidates showcase their technical skills through a coding assessment
- Depth in System Design
How to prepare
- Answer aloud and timed: What programming languages are you most proficient in and why?
- Answer aloud and timed: Can you explain how you would optimize a slow-running application?
Phone Screening
reportedA thorough phone screening to evaluate candidate qualifications.
What to demonstrate
- A thorough phone screening to evaluate candidate qualifications
- Depth in System Design
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.
Technical Interviews
reportedInterviews that may include system design and coding challenges.
What to demonstrate
- Interviews that may include system design and coding challenges
- Depth in System Design
How to prepare
- Answer aloud and timed: How do you ensure code quality in your projects?
- Answer aloud and timed: Design a system for a real-time messaging application. What components would you include?
PracHub editorial advice for the preparation topics above.
Practice Coding Regularly
Regular coding practice will enhance your problem-solving skills and prepare you for technical assessments.
Prepare for Behavioral Questions
Think of specific examples from your past experiences that demonstrate your skills and values aligned with EXOS.
Understand the Company Values
Familiarize yourself with EXOS’ mission and values to articulate how you fit within the organization.
Be Ready to Discuss Projects
Prepare to discuss your previous projects in detail, focusing on your role and contributions.
Choose a category, try a prompt, then open its approach, worked solution or follow-up when you need it.
Write a function to reverse a linked list.
Write a function to reverse a linked list.
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?
How would you implement a binary search algorithm?
How would you implement a binary search algorithm?
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, find the two numbers that add up to a specific target.
Given an array, 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?
Solve a problem involving string manipulation, such as checking for anagrams.
Solve a problem involving string manipulation, such as checking for anagrams.
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?
How would you approach optimizing a solution for time complexity?
How would you approach optimizing a solution for time complexity?
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?
Explain the trade-offs between SQL and NoSQL databases in a given scenario.
Explain the trade-offs between SQL and NoSQL databases in a given scenario.
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?
Find version gaps and relay lag with window functions
outbox_event holds event_id, aggregate_type, aggregate_id, aggregate_version, event_type, payload, status ('pending','published','dead'), attempts, created_at, published_at. A projection is missing rows and you must decide whether the relay skipped events or the consumer dropped them. Write three queries over the last seven days: one listing every aggregate_id whose published aggregate_version sequence has a hole, one giving per-day counts with a running total, and one returning the newest published event per aggregate. For each, say where the window function is evaluated relative to WHERE and LIMIT. PostgreSQL 16.
Approach
- Gaps: compute lead(aggregate_version) OVER (PARTITION BY aggregate_id ORDER BY aggregate_version) in a subquery, then filter next_version <> aggregate_version + 1 in the outer query. Window functions are evaluated after WHERE, GROUP BY and HAVING and before the outer ORDER BY and LIMIT, so the predicate cannot sit in the same WHERE clause and PostgreSQL 16 has no QUALIFY.
- Say what the seven-day filter does to the answer: it truncates every partition, so the first row per aggregate has no predecessor inside the window and a hole spanning the boundary is invisible. Widen the window, or join to resource.version as the authority for the true maximum.
- Running total: SELECT date_trunc('day', created_at) AS d, count() AS n, sum(count()) OVER (ORDER BY date_trunc('day', created_at) ROWS UNBOUNDED PRECEDING). An aggregate inside a window call is legal because grouping runs before windowing. The grouping key is unique per row here so ROWS and RANGE agree, but write the frame anyway — over ungrouped rows with tied timestamps the default RANGE frame pulls in every peer row and the total jumps.
- Newest per aggregate: DISTINCT ON (aggregate_id) ... ORDER BY aggregate_id, aggregate_version DESC is the cheap PostgreSQL-only form when an index matches that order; row_number() OVER (PARTITION BY aggregate_id ORDER BY aggregate_version DESC) = 1 is the portable form and needs a subquery for the same evaluation-order reason as the gap query.
Follow-up
- Relay failover redelivers events. Does a duplicate break the gap query, and how would you detect one from this table alone?
- Turn the gap check into a continuous monitor rather than a query someone runs after an incident. What does it watch?
What programming languages are you most proficient in and why?
What programming languages are you most proficient in and why?
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 you would optimize a slow-running application?
Can you explain how you would optimize a slow-running application?
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?
Describe a challenging bug you encountered and how you resolved it.
Describe a challenging bug you encountered and how you resolved it.
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?
What design patterns are you familiar with, and when would you use them?
What design patterns are you familiar with, and when would you use them?
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 ensure code quality in your projects?
How do you ensure code quality in your 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?
Design a system for a real-time messaging application. What components would you include?
Design a system for a real-time messaging application. What components would you include?
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 handle data consistency in a distributed system?
How would you handle data consistency in a distributed system?
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 approach designing a RESTful API.
Describe how you would approach designing a RESTful API.
Approach
- Say who the caller is and what they do when the call fails halfway.
- Define the identity of a request so a retry cannot double-apply it.
- Separate accepted, pending, failed and confirmed; they are different facts.
- Design the error taxonomy before the success shape; callers branch on it.
Follow-up
- What happens if the caller retries after a timeout?
- How does a client discover it is on an old version of this contract?
What considerations would you take into account for system security?
What considerations would you take into account for system security?
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?
Given a dataset, how would you identify patterns or anomalies?
Given a dataset, how would you identify patterns or anomalies?
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?
You are given a performance problem in a web application. What steps would you take to diagnose and fix it?
You are given a performance problem in a web application. What steps would you take to diagnose and fix it?
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 approach a situation where you don’t have enough information to solve a problem?
How would you approach a situation where you don’t have enough information to solve a problem?
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?
Walk me through your thought process for debugging a complex issue.
Walk me through your thought process for debugging a complex issue.
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 EXOS candidates report.
Prepare, practise & reflect
One practical outcome each day. Spend longer where you need it.
0 / 7 done01Map the EXOS loop
- Write out the reported sequence: Coding Assessment, Phone Screening, Technical Interviews.
- 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 3 reported rounds, with the weakest marked.
02Work System Design
- Spend the session on System Design, which EXOS candidates report being tested on.
- Write one worked example in System Design and time yourself on it.
Deliverable: One timed worked example in System Design.
03Work Scalability Concepts
- Spend the session on Scalability Concepts, which EXOS candidates report being tested on.
- Write one worked example in Scalability Concepts and time yourself on it.
Deliverable: One timed worked example in Scalability Concepts.
04Work Coding Assessments (Take-home/Timed)
- Spend the session on Coding Assessments (Take-home/Timed), which EXOS candidates report being tested on.
- Write one worked example in Coding Assessments (Take-home/Timed) and time yourself on it.
Deliverable: One timed worked example in Coding Assessments (Take-home/Timed).
05Answer out loud: Technical / Domain Questions
- Answer aloud, timed: What programming languages are you most proficient in and why?
- Answer aloud, timed: Can you explain how you would optimize a slow-running application?
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 for a real-time messaging application. What components would you include?
- Answer aloud, timed: How would you handle data consistency in a distributed system?
Deliverable: Spoken answers to 2 reported System Design / Architecture question(s), under time.
07Answer out loud: Behavioral / Leadership
- Answer aloud, timed: Describe a time you had a conflict with a teammate. How did you handle it?
- Answer aloud, timed: How do you prioritize your tasks when faced with multiple deadlines?
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 you had a conflict with a teammate. How did you handle it?
Describe a time you had a conflict with a teammate. How did you handle 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 your tasks when faced with multiple deadlines?
How do you prioritize your tasks when faced with multiple deadlines?
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 perform at your best?
What motivates you to perform at your best?
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?
Share an example of a time you led a project or initiative.
Share an example of a time you led a project or initiative.
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 adapt to changes in project scope or requirements?
How do you adapt to changes in project scope or requirements?
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?
Explain a time when you had to learn a new technology quickly to complete a project.
Explain a time when you had to learn a new technology quickly to complete a project.
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 you had a conflict with a teammate. How did you handle it?
- 02
How do you prioritize your tasks when faced with multiple deadlines?
- 03
What motivates you to perform at your best?
- 04
Share an example of a time you led a project or initiative.
How difficult is the interview process?
The interview process can be challenging, with a focus on both technical and behavioral assessments. Candidates typically benefit from thorough preparation, especially in coding and system design areas.
EXOS Software Engineer candidate reports ↗What differentiates successful candidates?
Successful candidates demonstrate a strong technical foundation, effective communication skills, and a collaborative mindset. They align well with the culture and values of EXOS.
EXOS Software Engineer candidate reports ↗How long does the interview process typically take?
The timeline from initial screening to offer can vary, but candidates should expect a few weeks of interviews and assessments.
EXOS Software Engineer candidate reports ↗What is the culture like at EXOS?
The culture at EXOS is collaborative and innovative, encouraging team members to share ideas and drive projects forward.
EXOS Software Engineer candidate reports ↗Are there opportunities for remote work?
EXOS offers flexible work arrangements, including remote and hybrid options, depending on team needs and individual preferences.
EXOS Software Engineer candidate reports ↗What topics does EXOS test in interviews?
EXOS interviews most often cover Stakeholder Management, Program Management, Program Delivery & Execution, Time Management, and Process Improvement. The exact emphasis depends on the specific role you apply for.
EXOS 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.
- 01EXOS 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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