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Perguntas de entrevistas da empresa
O que já apareceu em processos da DataArt
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CodingSenior
Find the single number that appears once when every other number appears twice, in O(n) time and O(1) extra space
Live coding challenge. Given an integer array with one unpaired value and all others appearing twice, return the unique value. Required linear runtime and constant extra space; optimal approach uses XOR.
O que treinar
Estruture solução, trade-offs e complexidade com clareza.
1 empresa
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TechnicalSenior
What are the main drawbacks of a microservice architecture?
Senior Python/backend technical round. Probed distributed complexity, team coordination, fragmented business rules and operational overhead.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
How many microservices were in the environment you worked on?
Senior Python/backend technical round. Follow-up to calibrate the scale and maturity of the candidate's microservices experience.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
What is the difference between a Kubernetes pod and a container?
Senior Python/backend technical round. Probed pods as Kubernetes scheduling units that can contain one or more tightly coupled containers.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
What Kubernetes concepts have you worked with?
Senior Python/backend technical round. Covered Kubernetes, Helm charts, Argo CD, environment configuration and DevOps collaboration.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
What production platform does your system run on?
Senior Python/backend technical round. Asked whether production used containers, a VPS, an application server or another platform.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
Which CI/CD tool have you used?
Senior Python/backend technical round. Follow-up asking for the concrete pipeline platform used in practice.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
What experience do you have with CI/CD?
Senior Python/backend technical round. Asked about pipelines for tests, container images and deployment.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
What is a mock in software testing?
Senior Python/backend technical round. Probed replacing dependencies such as database connections and controlling behavior in unit tests.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
What experience do you have writing unit tests in Python?
Senior Python/backend technical round. Broad testing experience question, including frameworks used in production projects.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
Tell me about a slow SQL query you helped optimize
Senior Python/backend technical round. Probed execution plans, early filtering, join order and measurable improvement.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
How do INNER, LEFT, RIGHT and FULL OUTER JOIN differ?
Senior Python/backend technical round. Follow-up on matched rows, preserved sides and NULL-filled columns.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
What is a SQL JOIN, and which types of JOIN exist?
Senior Python/backend technical round. Asked the candidate to name and explain INNER, LEFT, RIGHT and FULL OUTER JOIN.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
What does atomicity mean in a database transaction?
Senior Python/backend technical round. Follow-up on all-or-nothing execution and preventing partial commits.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
What is a database transaction, and what are its main benefits?
Senior Python/backend technical round. Probed transactions as units of work, commit/rollback behavior and ACID guarantees.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
Which SQL database engines have you worked with?
Senior Python/backend technical round. Follow-up asking for concrete relational database technologies used in projects.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
Which NoSQL database engines have you used?
Senior Python/backend technical round. Follow-up asking for concrete NoSQL technologies used in projects.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
What experience do you have with SQL and NoSQL databases?
Senior Python/backend technical round. Broad database experience question comparing relational and non-relational systems.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
Which component actually blocks a browser request when CORS headers are invalid?
Senior Python/backend technical round. Probed browser enforcement, preflight requests, response headers and why CLI clients behave differently.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
Have you worked with CORS, and how did you configure it?
Senior Python/backend technical round. Experience with allowed origins and framework middleware configuration.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
What authentication method did you use in the most recent API you worked on?
Senior Python/backend technical round. Covered an identity provider, OAuth-style flow, JWT bearer tokens, sessions and authorization checks.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
What are the main HTTP methods in a REST API, and when is each used?
Senior Python/backend technical round. Usage and semantics for GET, POST, PUT, PATCH and related methods, including idempotency.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
What happens when a parameter is mutated versus reassigned inside a Python function?
Senior Python/backend technical round. Follow-up on mutation, reassignment, mutable and immutable objects, and visibility to the caller.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
Are Python function parameters passed by value, by reference, or another model?
Senior Python/backend technical round. Tested Python's call-by-object-reference/call-by-sharing parameter model.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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