The role of a Software Engineer at DraftKings is pivotal for the continued success and innovation of the company within the competitive landscape of digital gaming and sports betting. As a Software Engineer, you will be deeply involved in developing and optimizing software solutions that power the core functionalities of DraftKings’ platforms. This includes designing robust systems that handle high volumes of transactions, implementing features that enhance user experience, and ensuring the reliability and scalability of applications. Your work directly impacts the company’s ability to deliver high-quality products to users, which is crucial for maintaining DraftKings’ reputation as a leader in the industry. You will collaborate with cross-functional teams, including product managers, designers, and other engineers, to create engaging products that meet the evolving demands of sports enthusiasts. This role is not only about coding; it involves strategic problem-solving, critical thinking, and a passion for sports and technology. At DraftKings, you will have the opportunity to work on exciting projects that challenge you to push the boundaries of what is possible in online gaming. Whether it’s enhancing real-time data processing for live betting or developing features that engage users, your contributions will play a key role in shaping the future of sports entertainment.
Phone Screen
reportedInitial call with a recruiter to evaluate your background and role fit.
What to demonstrate
- Initial call with a recruiter to evaluate your background and role fit
- Depth in Object-Oriented Programming (OOP)
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
reportedIncludes coding challenges and system design problems to assess technical skills.
What to demonstrate
- Includes coding challenges and system design problems to assess technical skills
- Depth in Object-Oriented Programming (OOP)
How to prepare
- Answer aloud and timed: Explain the concept of RESTful services and their importance in web applications.
- Answer aloud and timed: How do you manage state in a React application?
Technical Interviews
reportedA series of interviews focusing on technical skills and problem-solving.
What to demonstrate
- A series of interviews focusing on technical skills and problem-solving
- Depth in Object-Oriented Programming (OOP)
How to prepare
- Answer aloud and timed: Discuss a challenging technical problem you solved and the approach you took.
- Answer aloud and timed: Design a system to handle live sports data streaming.
Behavioral Discussions
reportedConversations to evaluate cultural fit and alignment with company values.
What to demonstrate
- Conversations to evaluate cultural fit and alignment with company values
- Depth in Object-Oriented Programming (OOP)
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 discussions above and write down what you would ask to confirm before it.
Final Panel Interview
reportedPossibly a concluding interview with multiple interviewers to finalize the evaluation.
What to demonstrate
- Possibly a concluding interview with multiple interviewers to finalize the evaluation
- Depth in Object-Oriented Programming (OOP)
How to prepare
- Answer aloud and timed: Explain how you would ensure fault tolerance in a distributed system.
- Answer aloud and timed: Describe a time when you had to work under pressure. How did you handle it?
PracHub editorial advice for the preparation topics above.
Prepare for Coding Challenges
Focus on practicing coding problems on platforms like LeetCode or HackerRank. Familiarize yourself with common algorithms and data structures.
Understand the Company’s Products
Have a solid grasp of DraftKings’ offerings and how your role will contribute to their success. This knowledge can enhance your discussions during interviews.
Practice Behavioral Questions
Be ready to discuss your past experiences and how they shaped your approach to teamwork and problem-solving.
Communicate Clearly
During technical interviews, articulate your thought process and reasoning as you solve problems. Effective communication can demonstrate your problem-solving approach.
Choose a category, try a prompt, then open its approach, worked solution or follow-up when you need it.
What are the key differences between synchronous and asynchronous programming?
What are the key differences between synchronous and asynchronous programming?
Approach
- Say what the runtime actually does before reasoning about the code.
- Name what is shared across threads and what owns each piece of state.
- Identify the window where an invariant is briefly untrue.
- Distinguish a value from a reference to it, and say which one you handed out.
Follow-up
- What happens if two callers reach this at the same time?
- Where could this allocate more than you expect?
Write a function to find the longest substring without repeating characters.
Write 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?
Implement a binary search algorithm in your preferred language.
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?
How would you reverse a linked list? Provide both iterative and recursive solutions.
How would you reverse a linked list? Provide both iterative and recursive solutions.
Approach
- Restate the input: its shape, its size, and what is guaranteed about it.
- Name the brute-force solution and its complexity before improving on it.
- Choose the data structure from the access pattern, not from familiarity.
- State the target complexity and say which constraint rules the naive version out.
Follow-up
- How does this change if the input no longer fits in memory?
- What is the worst case, and how likely is it on real data?
Discuss the trade-offs between SQL and NoSQL databases in your design.
Discuss the trade-offs between SQL and NoSQL databases in your design.
Approach
- Name the grain you start from and join outward from it.
- Check whether any join is one-to-many before aggregating, or the sums inflate.
- Say which index the query would use, and what makes it unusable.
- Handle the rows that do not match: that is usually the actual question.
Follow-up
- How does the query change if that join becomes one-to-many?
- What happens to this when the table is ten times larger?
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 how you would optimize a function for performance.
Describe how you would optimize a function for 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?
Explain the concept of RESTful services and their importance in web applications.
Explain the concept of RESTful services and their importance in web applications.
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 manage state in a React application?
How do you manage state in a React 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?
Discuss a challenging technical problem you solved and the approach you took.
Discuss a challenging technical problem you solved and the approach you took.
Approach
- Clarify what is being asked and what a complete answer contains.
- State your assumptions explicitly before working the problem.
- Say what you would check first and why it is the highest-information step.
- Work from the requirement backwards to the design.
Follow-up
- What assumption would you test first?
- How would you know your answer was wrong?
Design a system to handle live sports data streaming.
Design a system to handle live sports data streaming.
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 structure a microservices architecture for an online betting platform?
How would you structure a microservices architecture for an online betting 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?
Explain how you would ensure fault tolerance in a distributed system.
Explain how you would ensure fault tolerance in a distributed system.
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 a project where you had to pivot your approach due to unforeseen challenges.
Describe a project where you had to pivot your approach due to unforeseen challenges.
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 your process for estimating project timelines and deliverables.
Explain your process for estimating project timelines and deliverables.
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 critical production issue?
How would you approach debugging a critical 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 DraftKings candidates report.
Prepare, practise & reflect
One practical outcome each day. Spend longer where you need it.
0 / 7 done01Map the DraftKings loop
- Write out the reported sequence: Phone Screen, Technical Assessment, Technical Interviews, Behavioral Discussions, Final Panel 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 5 reported rounds, with the weakest marked.
02Work Object-Oriented Programming (OOP)
- Spend the session on Object-Oriented Programming (OOP), which DraftKings candidates report being tested on.
- Write one worked example in Object-Oriented Programming (OOP) and time yourself on it.
Deliverable: One timed worked example in Object-Oriented Programming (OOP).
03Work Technical Interviewing (Coding Interview)
- Spend the session on Technical Interviewing (Coding Interview), which DraftKings candidates report being tested on.
- Write one worked example in Technical Interviewing (Coding Interview) and time yourself on it.
Deliverable: One timed worked example in Technical Interviewing (Coding Interview).
04Work Object-Oriented Design
- Spend the session on Object-Oriented Design, which DraftKings candidates report being tested on.
- Write one worked example in Object-Oriented Design and time yourself on it.
Deliverable: One timed worked example in Object-Oriented Design.
05Answer out loud: Technical / Domain Questions
- Answer aloud, timed: Describe how you would optimize a function for performance.
- Answer aloud, timed: What are the key differences between synchronous and asynchronous programming?
Deliverable: Spoken answers to 2 reported Technical / Domain Questions question(s), under time.
06Answer out loud: System Design / Architecture
- Answer aloud, timed: Design a system to handle live sports data streaming.
- Answer aloud, timed: How would you structure a microservices architecture for an online betting platform?
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 under pressure. How did you handle it?
- Answer aloud, timed: How do you prioritize tasks when faced with multiple 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.
Describe a time when you had to work under pressure. How did you handle it?
Describe a time when you had to work under pressure. 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 faced with multiple deadlines?
How do you prioritize tasks when faced with multiple 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?
Give an example of how you handled a conflict within a team.
Give an example of how you handled a conflict within a team.
Approach
- Pick a story where you made the decision, not one where you watched it.
- State the situation in two sentences and spend the rest on the reasoning.
- Give the blast radius: what could have broken, and what you measured.
- Name the disagreement and how you resolved it with evidence.
Follow-up
- What would you do differently if you ran that again?
- How did you know your change caused the improvement?
What motivates you to perform well in your role?
What motivates you to perform well in your role?
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 under pressure. How did you handle it?
- 02
How do you prioritize tasks when faced with multiple deadlines?
- 03
Give an example of how you handled a conflict within a team.
- 04
What motivates you to perform well in your role?
What is the interview difficulty level at DraftKings?
The interview process can be considered challenging, with a strong emphasis on technical skills and problem-solving abilities. Candidates should prepare thoroughly, particularly in areas related to algorithms and system design.
DraftKings Software Engineer candidate reports ↗What differentiates successful candidates?
Successful candidates often demonstrate a balance of technical proficiency, effective communication, and a strong cultural fit with DraftKings' values. They showcase their problem-solving skills and ability to collaborate within teams.
DraftKings Software Engineer candidate reports ↗What is the timeline from initial screen to offer?
The overall hiring process typically takes several weeks, often involving multiple rounds of interviews. Candidates are encouraged to stay proactive in communication with recruiters for updates.
DraftKings Software Engineer candidate reports ↗How does DraftKings support remote work?
DraftKings has embraced a flexible work environment, accommodating both in-office and remote work arrangements. Candidates should inquire about specific team policies during their interviews.
DraftKings Software Engineer candidate reports ↗What is the company culture like at DraftKings?
DraftKings fosters an innovative and dynamic culture, emphasizing collaboration, creativity, and a passion for sports and technology. Candidates should be prepared to discuss how they align with these values during interviews.
DraftKings Software Engineer candidate reports ↗How many interview rounds does DraftKings have for a Software Engineer role and what are the stages?
For DraftKings Software Engineer roles, the process starts with a recruiter phone screen, then moves to a technical assessment with coding and system design problems. After that, candidates typically go through a series of technical interviews and behavioral discussions, with a possible final panel interview to conclude the evaluation.
DraftKings Software Engineer candidate reports ↗How hard is it to get an offer at DraftKings for Software Engineer?
In aggregated candidate reports, the most common self-reported difficulty for DraftKings interviews is average.
DraftKings Software Engineer candidate reports ↗What technical topics does DraftKings test for Software Engineer interviews?
Commonly tested areas include object-oriented programming, algorithmic problem solving, object-oriented design, and coding interview style practice. The topic list also includes input parsing and text processing, REST API development, and system design, plus JavaScript (Node.js) as a specific language focus.
DraftKings Software Engineer candidate reports ↗What coding and system design style questions should I expect for DraftKings Software Engineer?
Expect a mix of coding challenges and system design problems during the technical assessment, followed by additional technical interviews focused on problem-solving. The publicly listed sample questions include prioritizing conflicting high-stakes work and motivation through high-stakes account ownership.
DraftKings 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.
- 01DraftKings 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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