The role of a Software Engineer at Diligent Robotics is pivotal to the development and enhancement of robotic systems that support healthcare and service industries. As a Software Engineer, you will contribute directly to creating innovative solutions that improve the efficiency and effectiveness of robotic assistants, ultimately enhancing patient care in hospitals and other environments. This position offers the opportunity to work on cutting-edge technology that merges software engineering with robotics, making a tangible impact on real-world applications. This role is critical not only for the technical expertise required but also for the collaboration with interdisciplinary teams that include hardware engineers, designers, and healthcare professionals. You will engage in problem-solving discussions, utilize your programming skills to develop algorithms, and contribute to the integration of software with robotics. The challenges you face will be complex and require a blend of creativity, technical skills, and teamwork, making this an exciting opportunity for those passionate about robotics and software development.
Initial Screening
reportedAn initial evaluation of the candidate's background and fit for the role.
What to demonstrate
- An initial evaluation of the candidate's background and fit for the role
- Depth in Problem Solving (Interview/Whiteboard)
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 Assessments
reportedCandidates will complete coding challenges and answer technical questions.
What to demonstrate
- Candidates will complete coding challenges and answer technical questions
- Depth in Problem Solving (Interview/Whiteboard)
How to prepare
- Answer aloud and timed: Describe a challenging technical problem you faced and how you solved it.
- Answer aloud and timed: How do you approach debugging a complex software issue?
Final Interviews
reportedIn-depth interviews with team members focusing on technical skills and cultural fit.
What to demonstrate
- In-depth interviews with team members focusing on technical skills and cultural fit
- Depth in Problem Solving (Interview/Whiteboard)
How to prepare
- Answer aloud and timed: What are the key considerations when developing software for robotic systems?
- Answer aloud and timed: How would you optimize a robotic task that requires real-time decision-making?
PracHub editorial advice for the preparation topics above.
Understand the Product
Familiarize yourself with the robotics products developed by Diligent Robotics. Knowing their applications and user impact can strengthen your answers.
Communicate Clearly
During technical discussions, articulate your thought process clearly. Interviewers value clarity and logic in your explanations.
Prepare for Behavioral Questions
Reflect on past experiences that showcase your teamwork and problem-solving abilities. Be ready to discuss how you navigate challenges.
Showcase Your Passion
Let your enthusiasm for robotics and software development shine through. Candidates who express genuine interest often stand out.
Choose a category, try a prompt, then open its approach, worked solution or follow-up when you need it.
Write a function that determines if a given string is a palindrome.
Write a function that determines if a given string is a palindrome.
Approach
- Restate the input: its shape, its size, and what is guaranteed about it.
- Name the brute-force solution and its complexity before improving on it.
- Choose the data structure from the access pattern, not from familiarity.
- State the target complexity and say which constraint rules the naive version out.
Follow-up
- How does this change if the input no longer fits in memory?
- What is the worst case, and how likely is it on real data?
How would you approach writing a sorting algorithm for a list of data?
How would you approach writing a sorting algorithm for a list of data?
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 set of coordinates, how would you calculate the shortest path for a robot?
Given a set of coordinates, how would you calculate the shortest path for a robot?
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?
Hold a per-tenant active cap against concurrent creates
A tenant on the standard plan may hold at most 50 resources with status='active'. The create handler runs SELECT count(*) FROM resource WHERE tenant_id = $1 AND status = 'active', compares to 50, then inserts. Two creates arrive 3 ms apart on different instances and the tenant lands at 51. Name the anomaly, say whether PostgreSQL 16 READ COMMITTED or REPEATABLE READ prevents it and why, then give an implementation that holds the cap at READ COMMITTED with the exact statements. Finally, say what changes when the cap is 'at most one running export per tenant' on job_run.
Approach
- Name it: write skew. The two transactions read an overlapping set and write disjoint rows, so there is no row-level conflict for the engine to detect and each commit is individually legal.
- Rule out the levels precisely. READ COMMITTED takes a fresh snapshot per statement and takes no lock on the counted rows, so both see 49. PostgreSQL's REPEATABLE READ is snapshot isolation: it removes non-repeatable reads and phantoms within the snapshot but still admits write skew, because the anomaly is not a re-read of a changed row, it is a read of a set that a concurrent transaction invalidates. Only SERIALIZABLE closes it, by tracking the read dependency and aborting one transaction with SQLSTATE 40001 — a guarantee that exists only if the application re-runs the whole transaction from the read.
- Convert the set predicate into a single-row conflict: keep tenant.active_resource_count and run UPDATE tenant SET active_resource_count = active_resource_count + 1 WHERE tenant_id = $1 AND active_resource_count < 50 in the same transaction as the INSERT. Zero affected rows is the cap, returned as 409. The row lock serialises the decision at any isolation level, and contention is bounded to one tenant's row — which is also the fair-scheduling unit, unlike a global counter that would convoy every tenant behind one row.
- State the cost you just took on: a counter is a second source of truth that can drift, so every path that changes status must adjust it inside the same transaction, and a periodic reconciliation has to exist, with resource_revision as the authority for what the count should have been.
Follow-up
- A resource moves from archived back to active. Which statements change, and what breaks if the counter update and the status change land in different transactions?
- The cap becomes plan-dependent and a plan can change mid-month. Where does the number 50 live, and who reads it?
Explain why the owner filter ignores the listing index
The only index on resource is (tenant_id, status, updated_at DESC, resource_id DESC). A new endpoint returns one user's resources across all statuses, newest created first: WHERE tenant_id = $1 AND owner_user_id = $2 ORDER BY created_at DESC LIMIT 20. On a tenant with 2M rows it takes 900 ms and EXPLAIN shows a sort above a large scan. Explain precisely why the existing index cannot serve it, give the index that can, and state which of these the new index still will not help: owner_user_id alone across tenants; the same query ordered by updated_at. PostgreSQL 16.
Approach
- Separate the two jobs an index does. For filtering, a composite btree is seekable only on a left prefix, so with no predicate on status the scan can at best range over tenant_id and test owner_user_id per row; PostgreSQL 16 has no btree skip scan to jump the unconstrained column.
- For ordering, the index is sorted by (status, updated_at) within a tenant and not by created_at, so the LIMIT cannot stop early: every matching row is read and then sorted. That is the 'Sort Method: top-N heapsort' line, and it is why the plan reads 2M rows to answer with 20.
- Derive the replacement from the access path — equality, equality, then the ordering column: CREATE INDEX CONCURRENTLY ON resource (tenant_id, owner_user_id, created_at DESC). The scan seeks to the (tenant, owner) range and walks 20 entries in order, so the Sort node disappears along with the row-read.
- Treat INCLUDE (title, status) as conditional, not free. An index-only scan still visits the heap for any row whose page is not marked all-visible, so on a table taking 1.2k writes/second the win depends on autovacuum keeping the visibility map current, and the wider index costs more on every insert.
Follow-up
- 90% of rows are status='active'. Would a partial index WHERE status = 'active' change your answer, and for which of the three queries?
- A dashboard runs this for 40 owners in one page load. What changes about the design?
What programming languages are you most comfortable with, and why?
What programming languages are you most comfortable with, 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?
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?
What are the key considerations when developing software for robotic systems?
What are the key considerations when developing software for robotic systems?
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 optimize a robotic task that requires real-time decision-making?
How would you optimize a robotic task that requires real-time decision-making?
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?
Imagine a scenario where a robot fails to execute a task correctly. What steps would you take to diagnose the
Imagine a scenario where a robot fails to execute a task correctly. What steps would you take to diagnose the issue?
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 how you would implement a new feature in an existing robotic application.
Describe how you would implement a new feature in an existing robotic 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?
How do you approach debugging a complex software issue?
How do you approach debugging a complex software 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 Diligent Robotics candidates report.
Prepare, practise & reflect
One practical outcome each day. Spend longer where you need it.
0 / 7 done01Map the Diligent Robotics loop
- Write out the reported sequence: Initial Screening, Technical Assessments, Final 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 Problem Solving (Interview/Whiteboard)
- Spend the session on Problem Solving (Interview/Whiteboard), which Diligent Robotics candidates report being tested on.
- Write one worked example in Problem Solving (Interview/Whiteboard) and time yourself on it.
Deliverable: One timed worked example in Problem Solving (Interview/Whiteboard).
03Work Coding Challenge
- Spend the session on Coding Challenge, which Diligent Robotics candidates report being tested on.
- Write one worked example in Coding Challenge and time yourself on it.
Deliverable: One timed worked example in Coding Challenge.
04Work ROS (Robot Operating System)
- Spend the session on ROS (Robot Operating System), which Diligent Robotics candidates report being tested on.
- Write one worked example in ROS (Robot Operating System) and time yourself on it.
Deliverable: One timed worked example in ROS (Robot Operating System).
05Answer out loud: Technical / Domain Questions
- Answer aloud, timed: What programming languages are you most comfortable with, and why?
- Answer aloud, timed: Can you explain your experience with ROS (Robot Operating System)?
Deliverable: Spoken answers to 2 reported Technical / Domain Questions question(s), under time.
06Answer out loud: Problem-Solving / Case Studies
- Answer aloud, timed: How would you optimize a robotic task that requires real-time decision-making?
- Answer aloud, timed: Imagine a scenario where a robot fails to execute a task correctly. What steps would you take to diagnose the issue?
Deliverable: Spoken answers to 2 reported Problem-Solving / Case Studies question(s), under time.
07Answer out loud: Behavioral / Leadership
- Answer aloud, timed: Describe a time you worked on a team project. What was your role, and how did you contribute?
- Answer aloud, timed: How do you handle conflicts with team members?
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.
Can you explain your experience with ROS (Robot Operating System)?
Can you explain your experience with ROS (Robot Operating 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 you worked on a team project. What was your role, and how did you contribute?
Describe a time you worked on a team project. What was your role, and how did you contribute?
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 conflicts with team members?
How do you handle conflicts with team members?
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 robotics field?
What motivates you to work in the robotics field?
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
Can you explain your experience with ROS (Robot Operating System)?
- 02
Describe a time you worked on a team project. What was your role, and how did you contribute?
- 03
How do you handle conflicts with team members?
- 04
What motivates you to work in the robotics field?
How difficult is the interview process?
The interview process can vary, but candidates often find it moderately challenging, particularly in technical assessments. It's advisable to prepare thoroughly for coding challenges and technical discussions.
Diligent Robotics Software Engineer candidate reports ↗What differentiates successful candidates?
Successful candidates demonstrate strong technical skills, a collaborative spirit, and a clear alignment with the company's values and mission. They effectively communicate their thought processes and solutions.
Diligent Robotics Software Engineer candidate reports ↗What is the culture like at Diligent Robotics?
The culture at Diligent Robotics is collaborative and innovative, focusing on user-centered design and teamwork. Employees are encouraged to share ideas and work together to solve complex problems.
Diligent Robotics Software Engineer candidate reports ↗What is the typical timeline from initial interview to offer?
The timeline can range from two weeks to a month, depending on the number of interview rounds and candidate availability.
Diligent Robotics Software Engineer candidate reports ↗Are there remote work opportunities?
While Diligent Robotics has a presence in Austin, TX, they may offer flexible working arrangements depending on the role and team.
Diligent Robotics Software Engineer candidate reports ↗What topics does Diligent Robotics test in interviews?
Diligent Robotics interviews most often cover ROS (Robot Operating System), Problem Solving, Behavioral Interviewing, QA Engineering (General), and Robotics Engineering. The exact emphasis depends on the specific role you apply for.
Diligent Robotics 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.
- 01Diligent Robotics 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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