As a Software Engineer at Denali Therapeutics, you play a pivotal role in advancing the company’s mission to develop innovative therapies for neurodegenerative diseases. This position is essential for designing, implementing, and maintaining software solutions that drive our research and product development processes. Your contributions will have a direct impact on the efficacy and efficiency of our scientific pursuits, ultimately benefiting patients and healthcare providers. This role is critical due to the complexity and scale of the challenges faced in biotechnology. You will collaborate with cross-functional teams, including researchers, data scientists, and other engineers, to develop applications that support data analysis, modeling, and simulation. You will work on real-world problems, such as improving drug discovery processes or optimizing clinical trial data management, making the work not just technically challenging but also deeply meaningful. Candidates can expect a stimulating environment where creativity and technical expertise are highly valued. You'll be part of a forward-thinking organization that leverages cutting-edge technology in the pursuit of groundbreaking solutions.
Initial Screening Call
reportedAn initial call to assess your background and fit for the role.
What to demonstrate
- An initial call to assess your background and fit for the role
- Depth in Quality Assurance (QA)
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
reportedMultiple interviews focusing on your technical skills and problem-solving abilities.
What to demonstrate
- Multiple interviews focusing on your technical skills and problem-solving abilities
- Depth in Quality Assurance (QA)
How to prepare
- Answer aloud and timed: How do you ensure code quality and maintainability?
- Answer aloud and timed: Explain the principles of object-oriented programming.
Behavioral Assessments
reportedEvaluations aimed at understanding your cultural fit and thought processes.
What to demonstrate
- Evaluations aimed at understanding your cultural fit and thought processes
- Depth in Quality Assurance (QA)
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 assessments above and write down what you would ask to confirm before it.
Discussions with Senior Leadership
reportedFinal discussions to assess alignment with company values and leadership expectations.
What to demonstrate
- Final discussions to assess alignment with company values and leadership expectations
- Depth in Quality Assurance (QA)
How to prepare
- Answer aloud and timed: Describe the considerations you take into account when designing a database schema.
- Answer aloud and timed: Explain the trade-offs between microservices and a monolithic architecture.
PracHub editorial advice for the preparation topics above.
Understand the Mission
Familiarize yourself with Denali Therapeutics’ mission and values. Show how your goals align with their commitment to tackling neurodegenerative diseases.
Practice Coding
Use platforms like LeetCode or HackerRank to practice coding problems, particularly those relevant to the languages you’ll be using.
Prepare Questions
Have thoughtful questions ready to ask your interviewers about their work, challenges they face, and the team culture.
Review Past Projects
Be ready to discuss your previous work in detail, including challenges faced, technologies used, and outcomes achieved. This will demonstrate your practical experience and problem-solving abilities.
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 in your preferred language?
How would you implement a binary search algorithm in your preferred language?
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 a dataset, how would you find duplicates efficiently?
Given a dataset, how would you find duplicates efficiently?
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 differences between depth-first search and breadth-first search.
Explain the differences between depth-first search and breadth-first search.
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 dynamic programming and explain your approach.
Solve a problem involving dynamic programming and 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?
Describe the considerations you take into account when designing a database schema.
Describe the considerations you take into account when designing a database schema.
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 did you choose them?
What programming languages are you most proficient in, and why did you choose 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?
Describe a challenging software project you have worked on and the technologies you used.
Describe a challenging software project you have worked on and the technologies you used.
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 and maintainability?
How do you ensure code quality and maintainability?
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 the principles of object-oriented programming.
Explain the principles of object-oriented programming.
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 tools do you use for version control, and why are they important?
What tools do you use for version control, and why are they important?
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 system to handle real-time data processing?
How would you design a system to handle 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?
Explain the trade-offs between microservices and a monolithic architecture.
Explain the trade-offs between microservices and a 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?
How do you approach API design and documentation?
How do you approach API design and documentation?
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 use for load balancing and high availability?
What strategies do you use for load balancing and high availability?
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 your thought process when faced with an unexpected technical challenge.
Describe your thought process when faced with an unexpected technical challenge.
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?
Provide an example of how you optimized a process or system.
Provide an example of how you optimized a process or system.
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 tackle a project with unclear requirements?
How would you tackle a project with unclear requirements?
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 debugging a production issue?
How would you approach debugging a production 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 Denali Therapeutics candidates report.
Prepare, practise & reflect
One practical outcome each day. Spend longer where you need it.
0 / 7 done01Map the Denali Therapeutics loop
- Write out the reported sequence: Initial Screening Call, Technical Interviews, Behavioral Assessments, Discussions with Senior Leadership.
- 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 Quality Assurance (QA)
- Spend the session on Quality Assurance (QA), which Denali Therapeutics candidates report being tested on.
- Write one worked example in Quality Assurance (QA) and time yourself on it.
Deliverable: One timed worked example in Quality Assurance (QA).
03Work Validation Testing
- Spend the session on Validation Testing, which Denali Therapeutics candidates report being tested on.
- Write one worked example in Validation Testing and time yourself on it.
Deliverable: One timed worked example in Validation Testing.
04Work Software Engineering (General)
- Spend the session on Software Engineering (General), which Denali Therapeutics candidates report being tested on.
- Write one worked example in Software Engineering (General) and time yourself on it.
Deliverable: One timed worked example in Software Engineering (General).
05Answer out loud: Technical / Domain Questions
- Answer aloud, timed: What programming languages are you most proficient in, and why did you choose them?
- Answer aloud, timed: Describe a challenging software project you have worked on and the technologies you used.
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 system to handle real-time data processing?
- Answer aloud, timed: Describe the considerations you take into account when designing a database schema.
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?
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 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?
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?
Can you give an example of a time you took the initiative on a project?
Can you give an example of a time you took the initiative on 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?
How do you handle feedback and criticism?
How do you handle feedback and criticism?
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 does teamwork mean to you, and how do you contribute to a team dynamic?
What does teamwork mean to you, and how do you contribute to a team dynamic?
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?
Discuss a time when you used data to inform a decision.
Discuss a time when you used data to inform a decision.
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 work with a difficult team member. How did you handle it?
- 02
How do you prioritize tasks when working on multiple projects?
- 03
Can you give an example of a time you took the initiative on a project?
- 04
How do you handle feedback and criticism?
How difficult are the interviews, and how much preparation time is typical?
The interviews can be challenging, primarily due to the technical depth and the focus on problem-solving skills. Candidates typically spend several weeks preparing to ensure they are comfortable with both technical questions and behavioral assessments.
Denali Therapeutics Software Engineer candidate reports ↗What differentiates successful candidates?
Successful candidates demonstrate a strong blend of technical expertise and collaborative skills. They communicate effectively, embrace feedback, and show a genuine interest in the company's mission and values.
Denali Therapeutics Software Engineer candidate reports ↗What is the culture and working style at Denali Therapeutics?
Denali Therapeutics fosters a collaborative and innovative culture. Employees are encouraged to share ideas and work together across disciplines to tackle complex challenges in drug development.
Denali Therapeutics Software Engineer candidate reports ↗What is the typical timeline from initial screen to offer?
The process generally takes about 4-6 weeks, depending on the scheduling of interviews and the number of candidates in the process.
Denali Therapeutics Software Engineer candidate reports ↗Is there flexibility regarding remote work or hybrid expectations?
While the company has embraced hybrid work models, the specific arrangements can vary by team and role. It’s best to clarify expectations during the interview process.
Denali Therapeutics Software Engineer candidate reports ↗What topics does Denali Therapeutics test in interviews?
Denali Therapeutics interviews most often cover Test Planning, Quality Assurance (QA) Engineering, AI Engineering, Clinical Data Management, and Technical Seminars / Job Talk Delivery. The exact emphasis depends on the specific role you apply for.
Denali Therapeutics 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.
- 01Denali Therapeutics 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.
Cognition Software Engineer Interview Guide
What Cognition asks Software Engineer candidates, from reported rounds and questions.
Discord Software Engineer Interview Guide
Database practice for Discord candidates: how an index changes a query plan, and which anomalies survive a given isolation level, since read committed still permits non-repeatable reads.
CoreWeave Software Engineer Interview Guide
Failure-handling practice for CoreWeave software engineer candidates: requests whose outcome a timeout leaves unknown, where a retry is safe, and deduplicating at the receiver instead of assuming exactly-once delivery.
Aerospike Software Engineer Interview Questions & Guide 2026
Aerospike database-engine preparation through an original single-owner Python key-value store with bounded logical index accounting, disk-offset reads, conditional writes, tombstones, process-restart recovery and 3,240 checks. Existing 14 p