As a Software Engineer at OpenTable, you will play a crucial role in developing innovative solutions that enhance the dining experience for millions of users and restaurant partners. This position is vital not only for the technical execution of our products but also for shaping the future of our services through collaboration, creativity, and technical excellence. You will be part of a team that impacts essential aspects of our platform, from user interfaces to backend services, ensuring seamless interactions for customers and restaurant operators alike. In this role, you will tackle complex challenges, such as optimizing reservation algorithms, integrating payment systems, and building scalable APIs. You will work with cutting-edge technologies and methodologies, contributing to projects that enhance our core offerings. This position offers the opportunity to influence product strategies and technical design, making your contributions not just impactful but essential to the success of OpenTable.
Recruiter Screen
reportedInitial screening by a recruiter to assess candidate fit for the role.
What to demonstrate
- Initial screening by a recruiter to assess candidate fit for the role
- Depth in Data Structures & Algorithms
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 technical interviews focusing on coding challenges, system design, and problem-solving.
What to demonstrate
- Multiple technical interviews focusing on coding challenges, system design, and problem-solving
- Depth in Data Structures & Algorithms
How to prepare
- Answer aloud and timed: What is the time complexity of your chosen solution, and why?
- Answer aloud and timed: Can you explain how you would handle error management in your code?
Final Round
reportedFinal interview with team members to evaluate cultural fit and collaboration skills.
What to demonstrate
- Final interview with team members to evaluate cultural fit and collaboration skills
- Depth in Data Structures & Algorithms
How to prepare
- Answer aloud and timed: Write a function to merge two sorted arrays.
- Answer aloud and timed: Design a reservation system for a restaurant booking application.
PracHub editorial advice for the preparation topics above.
Prepare for Behavioral Questions
Use the STAR (Situation, Task, Action, Result) method to structure your responses to behavioral questions.
Practice Coding
Regularly solve coding challenges on platforms like LeetCode or HackerRank to sharpen your skills.
Understand the Company’s Products
Familiarize yourself with OpenTable's offerings and how they fit into the dining experience.
Engage in Mock Interviews
Conduct mock interviews with peers to simulate the interview environment and receive constructive feedback.
Choose a category, try a prompt, then open its approach, worked solution or follow-up when you need it.
How would you implement a function to check if a string is a palindrome?
How would you implement a function to check if a 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?
What is the time complexity of your chosen solution, and why?
What is the time complexity of your chosen solution, and why?
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 explain how you would handle error management in your code?
Can you explain how you would handle error management in your code?
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?
Write a function to merge two sorted arrays.
Write a function to merge two sorted arrays.
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 function to find the longest substring without repeating characters.
Implement a function to 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?
Given a binary tree, write a function to perform a depth-first search.
Given a binary tree, write a function to perform a depth-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?
Describe how you would implement a caching mechanism for frequently accessed data.
Describe how you would implement a caching mechanism for frequently accessed 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?
Describe how you would optimize a database query.
Describe how you would optimize a database query.
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?
Denormalise tenant onto revisions and backfill it live
resource_revision (revision_id, resource_id, version, actor_user_id, change_kind, patch, request_id, created_at) has 400M rows and no tenant column; tenant_id lives only on resource. Two reads need it: a tenant-scoped audit feed ordered by created_at DESC, and an offboarding purge. Both join back to resource today. Justify adding tenant_id to resource_revision against those two reads, name the anomaly the copy introduces and the constraint that prevents it, then give the ordered migration for a live table taking 1.2k writes/second — the lock each step takes, how the backfill is batched, and where each step stops being reversible. PostgreSQL 16.
Approach
- Justify from the access path rather than from taste. Without the column, the audit feed either scans resource_revision by created_at and discards other tenants' rows, or resolves the tenant's resource_ids first and probes with them — both proportional to the tenant's whole history rather than to one page. With (tenant_id, created_at DESC, revision_id DESC) it is a seek that stops at 50 rows, and the purge becomes a ranged delete instead of a join.
- Name the cost exactly: a second copy of a fact can disagree with the first. Make the disagreement unwritable rather than documented — add UNIQUE (resource_id, tenant_id) on resource so it can serve as a foreign-key target, then FOREIGN KEY (resource_id, tenant_id) REFERENCES resource (resource_id, tenant_id) on the revision table. A revision can then only ever carry its parent's tenant.
- Step one, expand: ALTER TABLE resource_revision ADD COLUMN tenant_id BIGINT NULL, with no default, so it is a catalogue change and no rewrite. It still needs ACCESS EXCLUSIVE for an instant, and that instant queues behind the longest open transaction on the table while every later query queues behind it — set lock_timeout to 2s and retry rather than wait.
- Step two, dual-write: deploy the writer that populates tenant_id on every new revision while reads still use the join. Reversible by redeploying the previous build, because nothing reads the column yet.
Follow-up
- The backfill is half finished and a rollback is required. What state is the table in, and what does the previous build do with a half-populated column?
- How do you verify the backfill actually finished, given rows are still being inserted while it runs?
Design a reservation system for a restaurant booking application.
Design a reservation system for a restaurant booking 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?
Explain how you would structure a microservices architecture for an e-commerce platform.
Explain how you would structure a microservices architecture for an e-commerce platform.
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 ensure data consistency across distributed systems?
How would you ensure data consistency across distributed systems?
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?
Discuss the trade-offs involved in using a relational database versus a NoSQL database.
Discuss the trade-offs involved in using a relational database versus a NoSQL database.
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 handle a sudden spike in traffic to your application.
Describe how you would handle a sudden spike in traffic to your 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?
If a restaurant receives negative feedback, how would you approach the situation?
If a restaurant receives negative feedback, how would you approach the situation?
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?
If a project is falling behind schedule, what steps would you take to address this?
If a project is falling behind schedule, what steps would you take to address this?
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?
Listing latency scales with page size, not with filters
The tenant listing endpoint reads resource filtered by tenant_id and status, ordered by updated_at DESC, and returns each row plus the owner's display name from app_user and the actor of that resource's latest resource_revision. p99 is 55 ms at 10 rows per page and 1.4 s at 200. Database telemetry shows 401 statements per request, each under 1 ms, and nothing in the slow-query log. Diagnose the cause and give the fix, stating the statement count per request and the p99 you expect afterwards.
Approach
- Read the counters before forming a theory. 401 statements for 200 rows is one driver query plus two per row, and sub-millisecond execution with an empty slow-query log rules out a bad plan. The time is round trips, which is why it is invisible in every per-query metric and scales with rows returned rather than with filter selectivity.
- Name the two per-row statements from their normalised text: a single-row app_user lookup by user_id, and a resource_revision lookup by resource_id ordered by version DESC LIMIT 1. Confirm by dropping those two response fields and watching the statement count fall to one. That locates the calls in the serialisation layer, not the repository.
- Check that the arithmetic accounts for the whole gap. Measure one round trip to the replica in isolation; 400 trips at roughly 3 ms of network plus 0.2 ms of execution is about 1.3 s on top of a 55 ms baseline, which matches. If the multiplication had fallen short, the N+1 would only be part of the story and you would keep looking.
- Batch both lookups. Collect owner_user_ids and resource_ids from the driver query, then issue WHERE tenant_id = $1 AND user_id = ANY($2) for the users, and PostgreSQL's SELECT DISTINCT ON (resource_id) ... WHERE resource_id = ANY($2) ORDER BY resource_id, version DESC for the latest revision, which the UNIQUE (resource_id, version) index serves directly. On an engine without DISTINCT ON, use a lateral join or a row_number window. Three statements per request at any page size.
Follow-up
- The page size is capped at 200 today. What breaks first if it is raised to 2,000, and is it still this bug?
- How do you stop the next N+1 from reaching production, given that no individual query is slow and the endpoint's tests pass?
Built from the rounds and topics OpenTable candidates report.
Prepare, practise & reflect
One practical outcome each day. Spend longer where you need it.
0 / 7 done01Map the OpenTable loop
- Write out the reported sequence: Recruiter Screen, Technical Interviews, Final Round.
- 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 Data Structures & Algorithms
- Spend the session on Data Structures & Algorithms, which OpenTable candidates report being tested on.
- Write one worked example in Data Structures & Algorithms and time yourself on it.
Deliverable: One timed worked example in Data Structures & Algorithms.
03Work Take-home Coding Assignments
- Spend the session on Take-home Coding Assignments, which OpenTable candidates report being tested on.
- Write one worked example in Take-home Coding Assignments and time yourself on it.
Deliverable: One timed worked example in Take-home Coding Assignments.
04Work Whiteboarding
- Spend the session on Whiteboarding, which OpenTable candidates report being tested on.
- Write one worked example in Whiteboarding and time yourself on it.
Deliverable: One timed worked example in Whiteboarding.
05Answer out loud: Technical / Coding Questions
- Answer aloud, timed: How would you implement a function to check if a string is a palindrome?
- Answer aloud, timed: Describe how you would optimize a database query.
Deliverable: Spoken answers to 2 reported Technical / Coding Questions question(s), under time.
06Answer out loud: System Design / Architecture
- Answer aloud, timed: Design a reservation system for a restaurant booking application.
- Answer aloud, timed: Explain how you would structure a microservices architecture for an e-commerce platform.
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 faced a significant challenge in a team project. How did you handle it?
- Answer aloud, timed: How do you prioritize tasks when working under tight deadlines?
Deliverable: Spoken answers to 2 reported Behavioral / Leadership question(s), under time.
Expand any day for tasks and deliverables. Your progress is saved on this device.
Behavioural rounds judge the decision you made and what it cost.
Tell me about a time you faced a significant challenge in a team project. How did you handle it?
Tell me about a time you faced a significant challenge in a team project. 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 under tight deadlines?
How do you prioritize tasks when working under tight deadlines?
Approach
- Pick a story where you made the decision, not one where you watched it.
- State the situation in two sentences and spend the rest on the reasoning.
- Give the blast radius: what could have broken, and what you measured.
- Name the disagreement and how you resolved it with evidence.
Follow-up
- What would you do differently if you ran that again?
- How did you know your change caused the improvement?
Describe a situation where you had to persuade others to adopt your point of view.
Describe a situation where you had to persuade others to adopt your point of view.
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 software development?
What motivates you to work in software development?
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 approach receiving and giving feedback?
How do you approach receiving and giving feedback?
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 how you would handle conflicting priorities among team members.
Describe how you would handle conflicting priorities among 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?
- 01
Tell me about a time you faced a significant challenge in a team project. How did you handle it?
- 02
How do you prioritize tasks when working under tight deadlines?
- 03
Describe a situation where you had to persuade others to adopt your point of view.
- 04
What motivates you to work in software development?
How difficult are the interviews at OpenTable?
The interviews are generally considered to be of average to difficult difficulty, testing both technical and behavioral skills. Candidates should prepare extensively to ensure they are comfortable with coding challenges and system design discussions.
OpenTable Software Engineer candidate reports ↗What differentiates successful candidates?
Successful candidates demonstrate not only strong technical skills but also effective communication and collaboration abilities. They align well with OpenTable's values and show a genuine interest in contributing to the team and product.
OpenTable Software Engineer candidate reports ↗What is the culture like at OpenTable?
OpenTable fosters a collaborative and innovative culture, valuing teamwork and open communication. Employees are encouraged to share ideas and take ownership of their projects.
OpenTable Software Engineer candidate reports ↗How long does the interview process usually take?
The typical timeline from initial screening to offer can vary but usually spans several weeks. Candidates should be prepared for multiple interview rounds, including technical assessments and behavioral evaluations.
OpenTable Software Engineer candidate reports ↗Are there remote work options available?
OpenTable offers flexible work arrangements, including remote and hybrid options. Candidates should inquire about specific policies during the interview process.
OpenTable Software Engineer candidate reports ↗What topics does OpenTable test in interviews?
OpenTable interviews most often cover SQL, Cross-functional collaboration, Design process, React, and Google Sheets. The exact emphasis depends on the specific role you apply for.
OpenTable 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.
- 01OpenTable 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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