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Perguntas de entrevistas da empresa
O que já apareceu em processos da DataArt
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CodingSenior
Coding challenge: find the single number when every other number appears twice.
Senior Python technical round. Coding challenge: given a list where every value appears twice except one value that appears once, return the single value. Expected discussion includes an O(n) hash map solution and the optimal XOR approach with O(n) time and O(1) space.
O que treinar
Estruture solução, trade-offs e complexidade com clareza.
1 empresa
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TechnicalSenior
What are the drawbacks of microservices?
Senior backend technical round. Asked about microservices trade-offs, including distributed-system complexity, deployment coordination, observability, service boundaries, data consistency, versioning contracts, and operational overhead.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
Explain CI/CD and Kubernetes basics, including pods and containers.
Senior backend technical round. Asked about CI/CD experience and Kubernetes basics, including the difference between a container and a pod, deployment pipelines, and how cloud-native services are packaged and deployed.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
What is mocking in tests and when would you use it?
Senior Python/backend technical round. Asked about mocks in unit tests, replacing dependencies such as databases, HTTP clients, queues, or external services, and verifying behavior without real external systems.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
Describe a query optimization you performed.
Senior backend technical round. Asked for a real query optimization example, including EXPLAIN/query plans, reducing rows before joins, moving filters earlier, indexing or query restructuring, and latency improvement.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
Explain SQL join types.
Senior backend technical round. Asked about SQL joins, especially inner join, left join, right join and full outer join, including returned rows and NULLs for missing matches.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
What are database transactions and ACID properties?
Senior backend technical round. Asked for a definition of transactions and ACID properties: atomicity, consistency, isolation and durability, including why they matter for reliable database updates.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
What is CORS and who enforces it?
Senior Python/backend technical round. Asked about CORS, browser enforcement, Access-Control-Allow-Origin headers, preflight OPTIONS requests, and why server-to-server or CLI calls are not restricted the same way.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
How does authentication work with OAuth, JWT, bearer tokens, or Keycloak?
Senior backend technical round. Asked about practical authentication with Keycloak, OAuth/JWT, bearer tokens, token validation, route authorization, roles/scopes, and API request validation.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
Explain REST methods and idempotency.
Senior Python/backend technical round. Asked about GET, POST, PUT, PATCH and DELETE, with emphasis on semantics and idempotency from the client perspective.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
How does Python pass parameters to functions?
Senior Python technical round. Tested object references, assignment, mutability, reassignment inside functions, and the difference between mutating an object and rebinding a local variable.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
Do you have experience with concurrency or parallelism in Python?
Senior Python technical round. Asked about concurrency and parallelism, CPU-bound versus I/O-bound work, processes versus threads, async I/O, and how the GIL affects design choices.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
Have you had performance issues with Python and how did you address them?
Senior Python technical round. Follow-up on concrete performance limitations and when to use profiling, SQL/index optimization, queues, compiled libraries, multiprocessing, or external systems instead of pure Python.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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TechnicalSenior
Why did you choose Python and what are its trade-offs?
Senior Python technical round. Asked about Python experience, why Python was chosen, whether it was project-driven, and trade-offs around productivity, syntax, performance, abstraction, backend and data use cases.
O que treinar
Revise fundamentos, debugging e tomada de decisão técnica.
1 empresa
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