As a Software Engineer at Nexxen, you will play a vital role in shaping innovative solutions that directly impact our products and users. Your work will influence the design and functionality of software that enhances user experience and drives business success. You will be part of a dynamic team that tackles complex challenges, integrating cutting-edge technologies to produce scalable and robust applications. This role is critical in driving Nexxen's mission forward, contributing to projects that range from building high-performance applications to designing scalable systems that meet user demands. You will collaborate closely with cross-functional teams, including product managers and UX designers, ensuring that your engineering efforts align with business goals and user needs. Expect to engage in exciting projects that require creative problem-solving and a proactive approach to technology.
HR Screening
reportedInitial discussion about your background and expectations.
What to demonstrate
- Initial discussion about your background and expectations
- Depth in Coding interviews
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
reportedEngage in coding challenges and system design discussions.
What to demonstrate
- Engage in coding challenges and system design discussions
- Depth in Coding interviews
How to prepare
- Answer aloud and timed: Describe a challenging technical problem you've solved in the past.
- Answer aloud and timed: How would you design a RESTful API for a new feature?
Team Interaction
reportedOpportunities to meet team members and understand the work culture.
What to demonstrate
- Opportunities to meet team members and understand the work culture
- Depth in Coding interviews
How to prepare
- Answer aloud and timed: Discuss your experience with version control systems like Git.
- Answer aloud and timed: Design a system that can handle real-time data processing for a social media application.
PracHub editorial advice for the preparation topics above.
Prepare for Behavioral Questions
Use the STAR method (Situation, Task, Action, Result) to structure your answers and provide clear, concise responses.
Show Enthusiasm for the Role
Demonstrating genuine interest in the position and the company's mission will leave a positive impression.
Ask Insightful Questions
Prepare questions that reflect your research about the company and its projects; this shows your engagement and interest.
Practice Coding Challenges
Regularly practice coding problems on platforms like LeetCode or HackerRank to solidify your skills.
Choose a category, try a prompt, then open its approach, worked solution or follow-up when you need it.
Explain the difference between synchronous and asynchronous programming.
Explain the difference 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?
Solve a coding challenge using your preferred programming language.
Solve a coding challenge using your preferred programming 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?
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?
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?
Write the update path that detects a concurrent edit
resource carries version INT NOT NULL DEFAULT 1. resource_revision holds revision_id, resource_id, version, actor_user_id, change_kind, patch JSONB, request_id, created_at with UNIQUE (resource_id, version). outbox_event holds aggregate_type, aggregate_id, aggregate_version, event_type, payload, status. A PUT carries the version the client read. Write the exact statements for the single transaction that applies the edit, records the revision and enqueues 'resource.updated', and give the handler's branch on zero affected rows. Then say what PostgreSQL 16 does under READ COMMITTED when two of these updates hit one row at once.
Approach
- One transaction, three writes, no network call inside it: UPDATE resource SET title = $3, version = version + 1, updated_at = now() WHERE resource_id = $1 AND tenant_id = $4 AND version = $2; then INSERT the resource_revision row at version $2 + 1; then INSERT the outbox_event row at the same aggregate_version. The event goes to a table rather than a broker because no transaction spans both.
- Branch on the affected-row count before doing anything else. Zero has three causes — stale version, wrong tenant, row gone — so re-read once and map to 409 carrying the current version, or 404 for an id outside the caller's tenant, which also stops the endpoint confirming that another tenant's id exists.
- State the engine behaviour instead of assuming it. Under READ COMMITTED the second UPDATE blocks on the row lock, and when the first commits PostgreSQL re-evaluates the WHERE clause against the newly committed row, so the version predicate now fails and the statement reports zero rows. Under REPEATABLE READ the identical collision raises SQLSTATE 40001 instead, so the handler must fold both shapes into one conflict response.
- Keep UNIQUE (resource_id, version) even though the predicate already serialises writers. It is what makes a lost update unwritable if any other path ever reaches the revision table, and it converts a logic bug into 23505 rather than into a silently missing history row.
Follow-up
- A client sends the version it read ten minutes ago and the resource has moved three versions. What is in your 409 so it can resolve the conflict without a full re-fetch?
- Two editors, two disjoint fields, no overlap. Does your answer still refuse the second write, and should it?
What strategies do you use to optimize application performance?
What strategies do you use to optimize application performance?
Approach
- Clarify what is being asked and what a complete answer contains.
- State your assumptions explicitly before working the problem.
- Say what you would check first and why it is the highest-information step.
- Work from the requirement backwards to the design.
Follow-up
- What assumption would you test first?
- How would you know your answer was wrong?
Describe a challenging technical problem you've solved in the past.
Describe a challenging technical problem you've solved in the past.
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 RESTful API for a new feature?
How would you design a RESTful API for a new feature?
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?
Design a system that can handle real-time data processing for a social media application.
Design a system that can handle real-time data processing for a social media 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?
What considerations would you take into account when designing a microservices architecture?
What considerations would you take into account when designing a microservices 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?
Describe how you would approach scaling an existing application.
Describe how you would approach scaling an existing 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 tasked with improving an existing feature, what steps would you take?
If tasked with improving an existing feature, what steps would you take?
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 Nexxen candidates report.
Prepare, practise & reflect
One practical outcome each day. Spend longer where you need it.
0 / 7 done01Map the Nexxen loop
- Write out the reported sequence: HR Screening, Technical Interviews, Team Interaction.
- 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 Coding interviews
- Spend the session on Coding interviews, which Nexxen candidates report being tested on.
- Write one worked example in Coding interviews and time yourself on it.
Deliverable: One timed worked example in Coding interviews.
03Work Architecture / Systems design (theory)
- Spend the session on Architecture / Systems design (theory), which Nexxen candidates report being tested on.
- Write one worked example in Architecture / Systems design (theory) and time yourself on it.
Deliverable: One timed worked example in Architecture / Systems design (theory).
04Work SQL
- Spend the session on SQL, which Nexxen candidates report being tested on.
- Write one worked example in SQL and time yourself on it.
Deliverable: One timed worked example in SQL.
05Answer out loud: Technical / Domain Questions
- Answer aloud, timed: Explain the difference between synchronous and asynchronous programming.
- Answer aloud, timed: What strategies do you use to optimize application performance?
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 that can handle real-time data processing for a social media application.
- Answer aloud, timed: What considerations would you take into account when designing a microservices architecture?
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 had to work with a difficult team member.
- Answer aloud, timed: How do you prioritize tasks when facing 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.
Discuss your experience with version control systems like Git.
Discuss your experience with version control systems like Git.
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?
Tell me about a time you had to work with a difficult team member.
Tell me about a time you had to work with a difficult team member.
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 facing multiple deadlines?
How do you prioritize tasks when facing 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?
Describe a situation where you took the lead on a project.
Describe a situation where you took the lead 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?
- 01
Discuss your experience with version control systems like Git.
- 02
Tell me about a time you had to work with a difficult team member.
- 03
How do you prioritize tasks when facing multiple deadlines?
- 04
Describe a situation where you took the lead on a project.
How difficult are the interviews, and how much preparation time is typical?
The interviews are designed to challenge your skills but are also structured to assess your fit for the role. Candidates typically spend several weeks preparing, focusing on technical skills and behavioral questions.
Nexxen Software Engineer candidate reports ↗What differentiates successful candidates?
Successful candidates demonstrate a combination of strong technical skills, effective problem-solving abilities, and a collaborative mindset. They also align well with Nexxen's values and culture.
Nexxen Software Engineer candidate reports ↗What is the culture and working style like at Nexxen?
Nexxen fosters a collaborative and innovative work environment. Teamwork is highly valued, and employees are encouraged to share ideas and contribute to projects.
Nexxen Software Engineer candidate reports ↗What is the typical timeline from initial screen to offer?
The entire process usually takes around 2-4 weeks, depending on scheduling and team availability.
Nexxen Software Engineer candidate reports ↗Are there remote work or hybrid expectations?
Nexxen supports flexible work arrangements, including remote and hybrid options. Be prepared to discuss your preferences during the interview process.
Nexxen Software Engineer candidate reports ↗What topics does Nexxen test in interviews?
Nexxen interviews most often cover Stakeholder Communication, Product Management, UX/UI Design, Project Management, and Machine Learning Engineering. The exact emphasis depends on the specific role you apply for.
Nexxen 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.
- 01Nexxen 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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