As a Software Engineer at Kraken Digital Asset Exchange, you play a vital role in shaping the future of digital finance. This position is critical not only for the development of innovative trading features but also for ensuring the security and reliability of our platform. By delivering robust and scalable software solutions, you directly impact the user experience for millions of customers globally, helping to build trust in the cryptocurrency ecosystem. In this role, you will collaborate with cross-functional teams, including product managers and UX designers, to develop cutting-edge features that meet the evolving needs of traders. Whether you are working on our trading engine, enhancing security protocols, or developing APIs for third-party integrations, your contributions will help drive the strategic direction of our products. Expect to engage with complex challenges, such as optimizing performance and ensuring compliance with regulatory standards, making this position both rewarding and intellectually stimulating.
Initial Screening
reportedThe first step involves an initial screening to assess candidate qualifications and fit.
What to demonstrate
- The first step involves an initial screening to assess candidate qualifications and fit
- Depth in Technical interviews (coding + architecture)
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 Assessment
reportedCandidates undergo technical assessments to evaluate their technical skills.
What to demonstrate
- Candidates undergo technical assessments to evaluate their technical skills
- Depth in Technical interviews (coding + architecture)
How to prepare
- Answer aloud and timed: Can you explain the architecture of a system you designed or worked on?
- Answer aloud and timed: What strategies do you employ to optimize application performance?
Behavioral Interview
reportedA behavioral interview to assess cultural fit and communication skills.
What to demonstrate
- A behavioral interview to assess cultural fit and communication skills
- Depth in Technical interviews (coding + architecture)
How to prepare
- Prepare three examples from your own work, each with a decision you made and an outcome you can quantify.
- Re-read the description of the behavioral interview above and write down what you would ask to confirm before it.
Final Interview
reportedFinal interviews with management to discuss overall fit and expectations.
What to demonstrate
- Final interviews with management to discuss overall fit and expectations
- Depth in Technical interviews (coding + architecture)
How to prepare
- Answer aloud and timed: Describe how you would implement a feature that requires real-time data processing.
- Answer aloud and timed: What considerations do you take into account when designing APIs for external integrations?
PracHub editorial advice for the preparation topics above.
Understand the crypto landscape
Familiarize yourself with the basics of cryptocurrency, blockchain technology, and Kraken's product offerings. This knowledge will enhance your discussions during interviews.
Prepare for a collaborative approach
Be ready to showcase how you work well in teams, emphasizing your interpersonal skills and ability to contribute positively to group dynamics.
Demonstrate your problem-solving process
When answering questions, articulate your thought process clearly. Interviewers are interested in how you arrive at solutions, not just the final answer.
Be ready for feedback
Embrace constructive criticism during coding assessments or design discussions, as it reflects a growth mindset essential for success at Kraken.
Choose a category, try a prompt, then open its approach, worked solution or follow-up when you need it.
Write a function to implement a specific algorithm (e.g., sorting, searching).
Write a function to implement a specific algorithm (e.g., sorting, searching).
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 using Rust within a specified time limit.
Solve a coding challenge using Rust within a specified time limit.
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 time and space complexity of your solution.
Discuss the time and space complexity of your solution.
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?
Can you refactor your code to make it more efficient or readable?
Can you refactor your code to make it more efficient or readable?
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?
Stop tag and share joins from fanning out a page
resource_tag is (resource_id, tag_id) with PK (resource_id, tag_id); resource_share is (resource_id, shared_with_user_id, permission). The tagged-and-shared listing inner-joins resource to both, filters tenant_id, tag_id = ANY($2) and shared_with_user_id = $3, orders by updated_at DESC and takes 50. Pages come back with fewer than 50 distinct resources and the total in the header is far too high. Explain the row multiplication, rewrite both the page query and the count query so each is correct, and name the index each one needs. PostgreSQL 16.
Approach
- Do the arithmetic against the predicates that are actually there. An inner join emits one row per matching child row, and both joins are filtered: tag_id = ANY($2) admits only the requested tags, shared_with_user_id = $3 admits one user's share rows. So a resource holding three of the requested tags and shared with $3 once yields three rows, not one — the multiplier is its count of matching tags times its share rows for that single user, and that second factor is 1 unless the table admits duplicate (resource_id, shared_with_user_id) pairs. LIMIT 50 then limits rows rather than resources, and COUNT(*) counts pairs — the header is the product, not the population.
- Reject DISTINCT as the fix. It deduplicates after the product has been built, so the planner must materialise and sort the fanned-out set before the LIMIT can apply, and it leaves any SUM or AVG in the same select list wrong.
- Rewrite both filters as semi-joins, keeping resource as the only row source: AND EXISTS (SELECT 1 FROM resource_tag rt WHERE rt.resource_id = r.resource_id AND rt.tag_id = ANY($2)) and the same shape against resource_share. A semi-join stops at the first match per resource and preserves the driving index order, so ORDER BY updated_at DESC, resource_id DESC LIMIT 50 still stops after 50 rows.
- Count with the same predicates and no join at all: SELECT count(*) FROM resource r WHERE r.tenant_id = $1 AND r.status = 'active' AND EXISTS (...) AND EXISTS (...). Nothing multiplies a resource, so the number is the population.
Follow-up
- The filter changes from 'any of these tags' to 'all of these tags'. Rewrite it and state what it costs relative to the ANY form.
- A resource can be shared with the same user twice under different permissions. Does your count change, and should it?
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?
Describe a challenging technical problem you faced and how you solved it.
Describe a challenging technical problem you faced and how you solved 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 do you ensure the security of your code in a production environment?
How do you ensure the security of your code in a production environment?
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 the architecture of a system you designed or worked on?
Can you explain the architecture of a system you designed or worked on?
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 strategies do you employ to optimize application performance?
What strategies do you employ to optimize application performance?
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 design a trading system that can handle thousands of transactions per second?
How would you design a trading system that can handle thousands of transactions per second?
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 implement a feature that requires real-time data processing.
Describe how you would implement a feature that requires real-time data processing.
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 considerations do you take into account when designing APIs for external integrations?
What considerations do you take into account when designing APIs for external integrations?
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?
Discuss potential bottlenecks in your design and how you would address them.
Discuss potential bottlenecks in your design and how you would address them.
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 improve an existing feature based on user feedback?
How would you improve an existing feature based on user feedback?
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 situation where you had to make a trade-off between performance and maintainability. What did you d
Describe a situation where you had to make a trade-off between performance and maintainability. What did you decide?
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 a technical decision you made that had significant implications for your project.
Explain a technical decision you made that had significant implications for your project.
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 evaluate the success of a new feature you implemented?
How would you evaluate the success of a new feature you implemented?
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 hypothetical scenario, how would you approach troubleshooting a critical system failure?
Given a hypothetical scenario, how would you approach troubleshooting a critical system failure?
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?
How would you approach debugging a complex piece of code?
How would you approach debugging a complex piece of 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 Kraken Digital Asset Exchange candidates report.
Prepare, practise & reflect
One practical outcome each day. Spend longer where you need it.
0 / 7 done01Map the Kraken Digital Asset Exchange loop
- Write out the reported sequence: Initial Screening, Technical Assessment, Behavioral Interview, Final 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 Technical interviews (coding + architecture)
- Spend the session on Technical interviews (coding + architecture), which Kraken Digital Asset Exchange candidates report being tested on.
- Write one worked example in Technical interviews (coding + architecture) and time yourself on it.
Deliverable: One timed worked example in Technical interviews (coding + architecture).
03Work System design
- Spend the session on System design, which Kraken Digital Asset Exchange 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.
04Work Live coding
- Spend the session on Live coding, which Kraken Digital Asset Exchange candidates report being tested on.
- Write one worked example in Live coding and time yourself on it.
Deliverable: One timed worked example in Live coding.
05Answer out loud: Technical / Domain Questions
- Answer aloud, timed: Describe a challenging technical problem you faced and how you solved it.
- Answer aloud, timed: How do you ensure the security of your code in a production environment?
Deliverable: Spoken answers to 2 reported Technical / Domain Questions question(s), under time.
06Answer out loud: System Design / Architecture
- Answer aloud, timed: How would you design a trading system that can handle thousands of transactions per second?
- Answer aloud, timed: Describe how you would implement a feature that requires real-time data processing.
Deliverable: Spoken answers to 2 reported System Design / Architecture question(s), under time.
07Answer out loud: Behavioral / Leadership
- Answer aloud, timed: Describe a time when you had to work with a difficult team member. How did you handle it?
- Answer aloud, timed: How do you prioritize tasks when working on multiple projects simultaneously?
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.
Discuss your experience with Rust and its concurrency model.
Discuss your experience with Rust and its concurrency model.
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 handle data consistency in a distributed system?
How do you handle data consistency in a distributed system?
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 work with a difficult team member. How did you handle it?
Describe a time when you had to work with a difficult team member. 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 tasks when working on multiple projects simultaneously?
How do you prioritize tasks when working on multiple projects simultaneously?
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 how you contributed to a positive team culture.
Share an example of how you contributed to a positive team culture.
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 work in the cryptocurrency space?
What motivates you to work in the cryptocurrency space?
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 handle ambiguity in project requirements?
How do you handle ambiguity in project 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?
- 01
Discuss your experience with Rust and its concurrency model.
- 02
How do you handle data consistency in a distributed system?
- 03
Describe a time when you had to work with a difficult team member. How did you handle it?
- 04
How do you prioritize tasks when working on multiple projects simultaneously?
What is the typical interview difficulty level at Kraken for this position?
The interview process is generally considered challenging, with a strong emphasis on technical skills and problem-solving abilities. Candidates should prepare for rigorous technical assessments alongside behavioral interviews.
Kraken Digital Asset Exchange Software Engineer candidate reports ↗How long does the interview process typically take?
The entire process can vary but generally lasts around three to four weeks, depending on scheduling and the number of candidates being interviewed.
Kraken Digital Asset Exchange Software Engineer candidate reports ↗What differentiates successful candidates from others?
Successful candidates demonstrate strong technical expertise, effective communication skills, and a genuine passion for cryptocurrency and the mission of Kraken. They also align well with the company's values and culture.
Kraken Digital Asset Exchange Software Engineer candidate reports ↗Is remote work an option for this role?
Yes, Kraken has a flexible remote work policy, allowing employees to work from various locations. However, candidates should confirm specific expectations during the interview process.
Kraken Digital Asset Exchange Software Engineer candidate reports ↗How can I best prepare for the technical interviews?
Focus on practicing coding problems, system design scenarios, and reviewing relevant technologies. Consider engaging in mock interviews to refine your problem-solving and communication skills.
Kraken Digital Asset Exchange Software Engineer candidate reports ↗What topics does Kraken Digital Asset Exchange test in interviews?
Kraken Digital Asset Exchange interviews most often cover Problem Solving, Stakeholder Management, Structured Problem Solving, System Design, and Risk Management. The exact emphasis depends on the specific role you apply for.
Kraken Digital Asset Exchange 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.
- 01Kraken Digital Asset Exchange 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
Explore related engineering environments and compare the preparation focus.
Red Ventures Software Engineer Interview Guide
What Red Ventures asks Software Engineer candidates, from reported rounds and questions.
Neighbor Software Engineer Interview Guide
What Neighbor asks Software Engineer candidates, from reported rounds and questions.
A10 Networks Software Engineer Interview Guide
What A10 Networks asks Software Engineer candidates, from reported rounds and questions.
Cognition Software Engineer Interview Guide
What Cognition asks Software Engineer candidates, from reported rounds and questions.