As a Software Engineer at Caddi, you will play a pivotal role in designing, developing, and maintaining software solutions that drive our business and enhance user experiences. This position is integral to the success of our products, as you will work on complex systems that streamline operations and deliver innovative functionalities to our clients. Your contributions will directly impact our ability to deliver high-quality, scalable software that meets the needs of our users and stakeholders. At Caddi, engineers work collaboratively across teams, focusing on a variety of projects that range from creating new features for existing products to architecting entirely new systems. You will have the opportunity to engage with cutting-edge technologies and methodologies, ensuring that our engineering practices are not only efficient but also aligned with the strategic goals of the company. This role is both challenging and rewarding, demanding a proactive approach to problem-solving and a commitment to continuous learning.
Technical Assessment
reportedInitial assessment to evaluate technical abilities through coding tests.
What to demonstrate
- Initial assessment to evaluate technical abilities through coding tests
- Depth in System Design
How to prepare
- Answer aloud and timed: Explain the difference between a stack and a queue.
- Answer aloud and timed: How do you handle version control in your projects?
HR Interview
reportedInterview with HR to discuss cultural fit and candidate background.
What to demonstrate
- Interview with HR to discuss cultural fit and candidate background
- Depth in System Design
How to prepare
- Answer aloud and timed: Describe a challenging bug you encountered and how you resolved it.
- Answer aloud and timed: What are the principles of object-oriented design?
Technical Lead Interview
reportedIn-depth technical discussions with technical leads to assess problem-solving skills.
What to demonstrate
- In-depth technical discussions with technical leads to assess problem-solving skills
- Depth in System Design
How to prepare
- Answer aloud and timed: Can you explain RESTful services and their benefits?
- Answer aloud and timed: Design a URL shortening service. What considerations would you take into account?
PracHub editorial advice for the preparation topics above.
Understand the company culture
Research Caddi’s mission and values to show alignment during your interviews.
Be prepared for coding assessments
Brush up on coding practices and algorithms to ensure you perform well in technical tests.
Communicate clearly
Articulate your thoughts and reasoning during problem-solving discussions to demonstrate your analytical skills.
Ask thoughtful questions
Prepare insightful questions to ask your interviewers, which shows your interest in the role and the company.
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?
Implement a binary search algorithm.
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?
How would you find the longest substring without repeating characters?
How would you find the longest substring without repeating characters?
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 dynamic programming and provide an example of where it can be applied.
Explain dynamic programming and provide an example of where it can be applied.
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 coding challenge from platforms like LeetCode or HackerRank.
Solve a coding challenge from platforms like LeetCode or HackerRank.
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?
Discuss the trade-offs between SQL and NoSQL databases in your design.
Discuss the trade-offs between SQL and NoSQL databases in your design.
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?
Explain the difference between a stack and a queue.
Explain the difference between a stack and a queue.
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 are the principles of object-oriented design?
What are the principles of object-oriented design?
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 RESTful services and their benefits?
Can you explain RESTful services and their benefits?
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 URL shortening service. What considerations would you take into account?
Design a URL shortening service. What considerations would you take into account?
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 creating a scalable chat application?
How would you approach creating a scalable chat 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?
What are key factors to consider in designing microservices?
What are key factors to consider in designing microservices?
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 an architecture you implemented in a previous project.
Describe an architecture you implemented in a previous project.
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 optimizing a slow-running application?
How would you approach optimizing 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?
Given a dataset, how would you determine if it is appropriate for machine learning?
Given a dataset, how would you determine if it is appropriate for machine learning?
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 steps would you take to ensure software quality in your projects?
What steps would you take to ensure software 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?
Explain how you would troubleshoot a system outage.
Explain how you would troubleshoot a system outage.
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 Caddi candidates report.
Prepare, practise & reflect
One practical outcome each day. Spend longer where you need it.
0 / 7 done01Map the Caddi loop
- Write out the reported sequence: Technical Assessment, HR Interview, Technical Lead 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 3 reported rounds, with the weakest marked.
02Work System Design
- Spend the session on System Design, which Caddi 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 Coding Assessments (Online/Take-home)
- Spend the session on Coding Assessments (Online/Take-home), which Caddi candidates report being tested on.
- Write one worked example in Coding Assessments (Online/Take-home) and time yourself on it.
Deliverable: One timed worked example in Coding Assessments (Online/Take-home).
04Work Large-Scale System Experience
- Spend the session on Large-Scale System Experience, which Caddi candidates report being tested on.
- Write one worked example in Large-Scale System Experience and time yourself on it.
Deliverable: One timed worked example in Large-Scale System Experience.
05Answer out loud: Technical / Domain Questions
- Answer aloud, timed: Explain the difference between a stack and a queue.
- Answer aloud, timed: How do you handle version control in your projects?
Deliverable: Spoken answers to 2 reported Technical / Domain Questions question(s), under time.
06Answer out loud: System Design / Architecture
- Answer aloud, timed: Design a URL shortening service. What considerations would you take into account?
- Answer aloud, timed: How would you approach creating a scalable chat application?
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 had a conflict with a teammate and how you resolved it.
- Answer aloud, timed: What motivates you to perform your best work?
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.
How do you handle version control in your projects?
How do you handle version control in your 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?
Tell me about a time you had a conflict with a teammate and how you resolved it.
Tell me about a time you had a conflict with a teammate and how you resolved 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 perform your best work?
What motivates you to perform 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?
Describe a situation where you had to learn something new quickly.
Describe a situation where you had to learn something new quickly.
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 managing multiple projects?
How do you prioritize tasks when managing 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?
Have you ever disagreed with a decision made by your manager? How did you handle it?
Have you ever disagreed with a decision made by your manager? 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?
Describe a time when you had to make a difficult decision with limited information.
Describe a time when you had to make a difficult decision with limited information.
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
How do you handle version control in your projects?
- 02
Tell me about a time you had a conflict with a teammate and how you resolved it.
- 03
What motivates you to perform your best work?
- 04
Describe a situation where you had to learn something new quickly.
What is the typical difficulty of the interviews?
The interviews at Caddi can vary in difficulty, but candidates often report them as being average to challenging. Preparation in both technical skills and behavioral aspects is crucial.
Caddi Software Engineer candidate reports ↗How much preparation time is recommended?
It is advisable to spend at least a few weeks preparing for your interviews. Focus on coding practice, system design, and understanding the company culture.
Caddi Software Engineer candidate reports ↗What differentiates successful candidates?
Successful candidates typically exhibit a clear understanding of both technical and non-technical skills, effectively communicate their problem-solving approaches, and align well with Caddi's culture.
Caddi Software Engineer candidate reports ↗What is the typical timeline from initial screen to offer?
The timeline can range from a few weeks to over a month, depending on scheduling and the number of candidates being considered.
Caddi Software Engineer candidate reports ↗Are there remote work options or hybrid expectations?
Caddi values flexibility and may offer remote or hybrid work arrangements, depending on the role and team dynamics.
Caddi Software Engineer candidate reports ↗How many rounds does Caddi have for a Software Engineer interview, and what are they?
For a Caddi Software Engineer role, the process commonly includes a Technical Assessment first, then an HR Interview, and finally a Technical Lead Interview. The Technical Assessment is used to evaluate your technical abilities through coding tests, and the Technical Lead Interview focuses on in-depth technical discussions to assess problem-solving.
Caddi Software Engineer candidate reports ↗How hard is the Caddi Software Engineer interview compared to other companies?
Candidates most commonly report the Caddi Software Engineer interviews as average in difficulty.
Caddi Software Engineer candidate reports ↗What topics does Caddi test for Software Engineer coding and system design?
Caddi’s top tested topics for Software Engineer include system design, coding assessments (online and take-home), large-scale system experience, and architecture and product flow design. You should also be ready for frontend architecture and engineering topics, plus programming and data topics like Ruby, JSON parsing, and SQL scripting.
Caddi Software Engineer candidate reports ↗Does Caddi test Ruby, JSON parsing, and SQL for Software Engineer interviews?
Yes, Ruby and JSON parsing appear in Caddi’s top topics, along with SQL (scripting). If you are interviewing for Software Engineer, you should prepare coding and practical reasoning that can involve these areas.
Caddi Software Engineer candidate reports ↗What coding formats should I expect for Caddi Software Engineer, take-home or online?
Coding assessments are listed as part of Caddi’s process, and the top topics explicitly call out coding assessments in online and take-home formats. Plan to be ready to demonstrate problem-solving in a coding environment, not just in verbal discussion.
Caddi Software Engineer candidate reports ↗How much does Caddi pay a Software Engineer?
The provided information does not include salary or compensation figures for Caddi Software Engineer roles, so there is nothing supported to report on pay here. If you want, share the job posting or range you are looking at, and I can help you interpret it against what the process tests.
Caddi 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.
- 01Caddi 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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