cswork / libraryOpen practice workspace

Interview guides · Dataiku

Dataiku Software Engineer Interview Guide

Dataiku Software Engineer interview guide: reported rounds, questions and how candidates describe the process.

The 60-second brief

At Dataiku, a Software Engineer plays a vital role in advancing The Universal AI Platform™, empowering enterprise organizations to build, deploy, and govern data science, analytics, and machine learning workloads at scale. As part of the engineering organization, you will design and implement resilient systems that bridge complex data infrastructure—such as Kubernetes, Apache Spark, and multi-cloud environments—with intuitive low-code and full-code development environments. The flagship product, Dataiku Data Science Studio (DSS), enables thousands of data scientists, engineers, and analysts globally to turn complex data into actionable models and autonomous AI agents. Your work directly impacts how teams interact with massive data pipelines and sophisticated computing frameworks.

This guide is scoped to a Software Engineer candidate at Dataiku.

Focus areas

  • Production Code Quality
  • Logging / Observability
  • Web Application Development (Website Building)

The Dataiku interview process

Dataiku candidates report 4 rounds over 3-5 weeks. The stages below are what candidates describe, not a published process.

Talent Acquisition Screen

Initial review of your background, career trajectory, and mutual expectations.

What to demonstrate

  • Initial review of your background, career trajectory, and mutual expectations
  • Depth in Production Code Quality

How to prepare

  • Answer aloud and timed: Implement an algorithm to find the shortest path between two nodes in a weighted graph where edge weights change dynamically over time.
  • Answer aloud and timed: How do you detect and handle cycles when executing graph-based data workflows where node waiting times are allowed?

Technical Screen

Discussion with an engineering manager or senior engineer covering architecture, computer science fundamentals, and live problem-solving.

What to demonstrate

  • Discussion with an engineering manager or senior engineer covering architecture, computer science fundamentals, and live problem-solving
  • Depth in Production Code Quality

How to prepare

  • Answer aloud and timed: Design a route optimization algorithm (such as Dijkstra's or A) that navigates around dynamic obstacles efficiently.
  • Answer aloud and timed: What are the time and space complexity trade-offs of using A search versus Dijkstra's algorithm in dynamic constraint environments?

Take-Home Challenge

Candidates construct a complete, functional application or complex algorithm as a technical assignment.

What to demonstrate

  • Candidates construct a complete, functional application or complex algorithm as a technical assignment
  • Depth in Production Code Quality

How to prepare

  • Answer aloud and timed: Write a clean, optimal solution to traverse a multi-node workflow graph and optimize memory allocation across concurrent tasks.
  • Answer aloud and timed: How do you structure a production-ready application comprising a REST API, a CLI, and a modern web interface?

Technical Debriefs

Sessions with senior engineers and VPs involving live code reviews and discussions on architecture and scalability.

What to demonstrate

  • Sessions with senior engineers and VPs involving live code reviews and discussions on architecture and scalability
  • Depth in Production Code Quality

How to prepare

  • Answer aloud and timed: What strategies do you use for centralized logging, error handling, and structured telemetry in microservices?
  • Answer aloud and timed: How do you configure security headers, CORS, and authentication middleware in an enterprise-facing web application?

Where candidates lose points

Clarify Take-Home Requirements Early

The take-home prompt can be intentionally open-ended. Reach out to your recruiter or engineering contact to clarify expectations regarding mandatory vs. additive features before writing code.

Prioritize Code Quality Over Feature Scope

Reviewers prioritize a well-tested, fully logged, and bug-free application with a solid graph algorithm over a bloated feature set that contains console warnings or unhandled exceptions.

Master Graph Pathfinding Fundamentals

Refresh your knowledge of dynamic graph traversal algorithms, including Dijkstra's and A pathfinding. Be prepared to explain edge case handling like graph cycles and changing edge weights.

Never submit a take-home project with unhandled errors, missing unit tests, or console warnings

Interviewers frequently reject submissions on code hygiene issues even if the primary logic works.

Questions & practice

Implement an algorithm to find the shortest path between two nodes in a weighted graph where edge weights chan

Medium · Graph Algorithms & Algorithmic Problem S

Implement an algorithm to find the shortest path between two nodes in a weighted graph where edge weights change dynamically over time.

Approach

  1. Restate the input: its shape, its size, and what is guaranteed about it.
  2. Name the brute-force solution and its complexity before improving on it.
  3. Choose the data structure from the access pattern, not from familiarity.
  4. 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 do you detect and handle cycles when executing graph-based data workflows where node waiting times are all

Medium · Graph Algorithms & Algorithmic Problem S

How do you detect and handle cycles when executing graph-based data workflows where node waiting times are allowed?

Approach

  1. Restate the input: its shape, its size, and what is guaranteed about it.
  2. Name the brute-force solution and its complexity before improving on it.
  3. Choose the data structure from the access pattern, not from familiarity.
  4. 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 are the time and space complexity trade-offs of using A search versus Dijkstra's algorithm in dynamic con

Medium · Graph Algorithms & Algorithmic Problem S

What are the time and space complexity trade-offs of using A search versus Dijkstra's algorithm in dynamic constraint environments?

Approach

  1. Restate the input: its shape, its size, and what is guaranteed about it.
  2. Name the brute-force solution and its complexity before improving on it.
  3. Choose the data structure from the access pattern, not from familiarity.
  4. 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 clean, optimal solution to traverse a multi-node workflow graph and optimize memory allocation across

Medium · Graph Algorithms & Algorithmic Problem S

Write a clean, optimal solution to traverse a multi-node workflow graph and optimize memory allocation across concurrent tasks.

Approach

  1. Say what the runtime actually does before reasoning about the code.
  2. Name what is shared across threads and what owns each piece of state.
  3. Identify the window where an invariant is briefly untrue.
  4. 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?

Why do you want to join Dataiku, and how does our platform compare to other enterprise data and AI solutions?

Medium · Behavioral, Culture & Product Mindset

Approach

  1. Name the grain you start from and join outward from it.
  2. Check whether any join is one-to-many before aggregating, or the sums inflate.
  3. Say which index the query would use, and what makes it unusable.
  4. 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?

Explain why the owner filter ignores the listing index

Medium · composite index · query plans · sort elimination

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

  1. 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.
  2. 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.
  3. 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.
  4. 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?

Design a route optimization algorithm (such as Dijkstra's or A) that navigates around dynamic obstacles effici

Medium · Graph Algorithms & Algorithmic Problem S

Design a route optimization algorithm (such as Dijkstra's or A) that navigates around dynamic obstacles efficiently.

Approach

  1. Fix the scope first: who calls this, how often, and what they do when it fails.
  2. Name the read and write paths separately; they rarely have the same bottleneck.
  3. Choose a partition key and say what query it makes expensive.
  4. 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 structure a production-ready application comprising a REST API, a CLI, and a modern web interface?

Medium · Production-Ready Application & Full-Stac

Approach

  1. Say who the caller is and what they do when the call fails halfway.
  2. Define the identity of a request so a retry cannot double-apply it.
  3. Separate accepted, pending, failed and confirmed; they are different facts.
  4. Design the error taxonomy before the success shape; callers branch on it.

Follow-up

  • What happens if the caller retries after a timeout?
  • How does a client discover it is on an old version of this contract?

What strategies do you use for centralized logging, error handling, and structured telemetry in microservices?

Medium · Production-Ready Application & Full-Stac

Approach

  1. Fix the scope first: who calls this, how often, and what they do when it fails.
  2. Name the read and write paths separately; they rarely have the same bottleneck.
  3. Choose a partition key and say what query it makes expensive.
  4. 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 configure security headers, CORS, and authentication middleware in an enterprise-facing web applica

Medium · Production-Ready Application & Full-Stac

How do you configure security headers, CORS, and authentication middleware in an enterprise-facing web application?

Approach

  1. Clarify what is being asked and what a complete answer contains.
  2. State your assumptions explicitly before working the problem.
  3. Say what you would check first and why it is the highest-information step.
  4. 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 approach to writing comprehensive unit, integration, and end-to-end tests for a asynchronous full

Medium · Production-Ready Application & Full-Stac

Explain your approach to writing comprehensive unit, integration, and end-to-end tests for a asynchronous full-stack application.

Approach

  1. Say who the caller is and what they do when the call fails halfway.
  2. Define the identity of a request so a retry cannot double-apply it.
  3. Separate accepted, pending, failed and confirmed; they are different facts.
  4. Design the error taxonomy before the success shape; callers branch on it.

Follow-up

  • What happens if the caller retries after a timeout?
  • How does a client discover it is on an old version of this contract?

How do you manage web console warnings, dependency trees, and third-party library performance in modern fronte

Medium · Production-Ready Application & Full-Stac

How do you manage web console warnings, dependency trees, and third-party library performance in modern frontend applications?

Approach

  1. Clarify what is being asked and what a complete answer contains.
  2. State your assumptions explicitly before working the problem.
  3. Say what you would check first and why it is the highest-information step.
  4. 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 does Dataiku DSS integrate with distributed compute engines like Apache Spark and container orchestration

Medium · Cloud, Infrastructure & Big Data Systems

How does Dataiku DSS integrate with distributed compute engines like Apache Spark and container orchestration via Kubernetes?

Approach

  1. Fix the scope first: who calls this, how often, and what they do when it fails.
  2. Name the read and write paths separately; they rarely have the same bottleneck.
  3. Choose a partition key and say what query it makes expensive.
  4. 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 deploy a containerized full-stack service into cloud environments such as Microsoft Azur

Medium · Cloud, Infrastructure & Big Data Systems

Explain how you would deploy a containerized full-stack service into cloud environments such as Microsoft Azure or AWS.

Approach

  1. Fix the scope first: who calls this, how often, and what they do when it fails.
  2. Name the read and write paths separately; they rarely have the same bottleneck.
  3. Choose a partition key and say what query it makes expensive.
  4. 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 are the operational challenges of managing stateful vs. stateless microservices on Kubernetes clusters?

Medium · Cloud, Infrastructure & Big Data Systems

Approach

  1. Fix the scope first: who calls this, how often, and what they do when it fails.
  2. Name the read and write paths separately; they rarely have the same bottleneck.
  3. Choose a partition key and say what query it makes expensive.
  4. 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 the data flow and execution path when processing multi-terabyte datasets using distributed query engi

Medium · Cloud, Infrastructure & Big Data Systems

Describe the data flow and execution path when processing multi-terabyte datasets using distributed query engines.

Approach

  1. Fix the scope first: who calls this, how often, and what they do when it fails.
  2. Name the read and write paths separately; they rarely have the same bottleneck.
  3. Choose a partition key and say what query it makes expensive.
  4. 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 are the primary attributes and evaluation metrics used to assess Large Language Models (LLMs) in enterpri

Medium · Domain Knowledge & Technical Architectur

What are the primary attributes and evaluation metrics used to assess Large Language Models (LLMs) in enterprise applications?

Approach

  1. Fix the scope first: who calls this, how often, and what they do when it fails.
  2. Name the read and write paths separately; they rarely have the same bottleneck.
  3. Choose a partition key and say what query it makes expensive.
  4. 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 design a scalable service that enables non-technical users to build and evaluate machine learnin

Medium · Domain Knowledge & Technical Architectur

How would you design a scalable service that enables non-technical users to build and evaluate machine learning pipelines?

Approach

  1. Fix the scope first: who calls this, how often, and what they do when it fails.
  2. Name the read and write paths separately; they rarely have the same bottleneck.
  3. Choose a partition key and say what query it makes expensive.
  4. 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 financial services and enterprise clients leverage big data architecture to execute real-time risk

Medium · Domain Knowledge & Technical Architectur

Explain how financial services and enterprise clients leverage big data architecture to execute real-time risk modeling.

Approach

  1. Fix the scope first: who calls this, how often, and what they do when it fails.
  2. Name the read and write paths separately; they rarely have the same bottleneck.
  3. Choose a partition key and say what query it makes expensive.
  4. 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 architectural considerations are necessary when designing APIs meant for high-concurrency enterprise work

Medium · Domain Knowledge & Technical Architectur

What architectural considerations are necessary when designing APIs meant for high-concurrency enterprise workloads?

Approach

  1. Fix the scope first: who calls this, how often, and what they do when it fails.
  2. Name the read and write paths separately; they rarely have the same bottleneck.
  3. Choose a partition key and say what query it makes expensive.
  4. 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 monitor and debug performance bottlenecks in distributed data pipelines running across cloud enviro

Medium · Cloud, Infrastructure & Big Data Systems

How do you monitor and debug performance bottlenecks in distributed data pipelines running across cloud environments?

Approach

  1. Establish what changed and when, before forming any theory.
  2. Pick a bisection that eliminates candidates whichever way it turns out.
  3. Check the instrumentation before believing the symptom.
  4. 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?

Suggested practice checklist

Built from the rounds and topics Dataiku candidates report.

Day 1 — Map the Dataiku loop

  • Write out the reported sequence: Talent Acquisition Screen, Technical Screen, Take-Home Challenge, Technical Debriefs.
  • 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.

Day 2 — Work Production Code Quality

  • Spend the session on Production Code Quality, which Dataiku candidates report being tested on.
  • Write one worked example in Production Code Quality and time yourself on it.

Deliverable: One timed worked example in Production Code Quality.

Day 3 — Work Logging / Observability

  • Spend the session on Logging / Observability, which Dataiku candidates report being tested on.
  • Write one worked example in Logging / Observability and time yourself on it.

Deliverable: One timed worked example in Logging / Observability.

Day 4 — Work Web Application Development (Website Building)

  • Spend the session on Web Application Development (Website Building), which Dataiku candidates report being tested on.
  • Write one worked example in Web Application Development (Website Building) and time yourself on it.

Deliverable: One timed worked example in Web Application Development (Website Building).

Day 5 — Answer out loud: Graph Algorithms & Algorithmic Problem Solving

  • Answer aloud, timed: Implement an algorithm to find the shortest path between two nodes in a weighted graph where edge weights change dynamically over time.
  • Answer aloud, timed: How do you detect and handle cycles when executing graph-based data workflows where node waiting times are allowed?

Deliverable: Spoken answers to 2 reported Graph Algorithms & Algorithmic Problem Solving question(s), under time.

Day 6 — Answer out loud: Production-Ready Application & Full-Stack Development

  • Answer aloud, timed: How do you structure a production-ready application comprising a REST API, a CLI, and a modern web interface?
  • Answer aloud, timed: What strategies do you use for centralized logging, error handling, and structured telemetry in microservices?

Deliverable: Spoken answers to 2 reported Production-Ready Application & Full-Stack Development question(s), under time.

Day 7 — Answer out loud: Cloud, Infrastructure & Big Data Systems

  • Answer aloud, timed: How does Dataiku DSS integrate with distributed compute engines like Apache Spark and container orchestration via Kubernetes?
  • Answer aloud, timed: Explain how you would deploy a containerized full-stack service into cloud environments such as Microsoft Azure or AWS.

Deliverable: Spoken answers to 2 reported Cloud, Infrastructure & Big Data Systems question(s), under time.

Behavioural preparation

Behavioural rounds judge the decision you made and what it cost.

Describe a time you had to deliver a complex project under ambiguous requirements or incomplete specifications

Medium · Behavioral, Culture & Product Mindset

Describe a time you had to deliver a complex project under ambiguous requirements or incomplete specifications.

Approach

  1. Pick a story where you made the decision, not one where you watched it.
  2. State the situation in two sentences and spend the rest on the reasoning.
  3. Give the blast radius: what could have broken, and what you measured.
  4. 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 technical debt, refactoring, and code quality against tight delivery deadlines?

Medium · Behavioral, Culture & Product Mindset

Approach

  1. Pick a story where you made the decision, not one where you watched it.
  2. State the situation in two sentences and spend the rest on the reasoning.
  3. Give the blast radius: what could have broken, and what you measured.
  4. 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 technical decision you made that resulted in trade-offs between system performance and develop

Medium · Behavioral, Culture & Product Mindset

Tell me about a technical decision you made that resulted in trade-offs between system performance and developer velocity.

Approach

  1. Pick a story where you made the decision, not one where you watched it.
  2. State the situation in two sentences and spend the rest on the reasoning.
  3. Give the blast radius: what could have broken, and what you measured.
  4. 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 when senior engineers or stakeholders critique your architectural choices during re

Medium · Behavioral, Culture & Product Mindset

How do you handle feedback when senior engineers or stakeholders critique your architectural choices during review?

Approach

  1. Pick a story where you made the decision, not one where you watched it.
  2. State the situation in two sentences and spend the rest on the reasoning.
  3. Give the blast radius: what could have broken, and what you measured.
  4. 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?