Back Market prep

Back Market Mid-level (3–5 years) Technical deep dive

#91

What is the Python GIL and how does it affect concurrency? — Back Market interview

Reported in Back Market European engineering loops. Python-specific question on threading limits and multiprocessing alternatives.

Medium Read answer →

Back Market Mid-level (3–5 years) Technical deep dive

#92

When would you use useState versus useReducer in React? — Back Market interview

Reported in Back Market European engineering loops. React hooks question on local state complexity and predictable updates.

Medium Read answer →

Back Market Mid-level (3–5 years) Technical deep dive

#93

How does Node.js handle concurrent requests with a single thread? — Back Market interview

Reported in Back Market European engineering loops. Node.js architecture question on libuv, event loop phases, and worker threads.

Medium Read answer →

Back Market Junior (1–3 years) Technical deep dive

#94

What is a database index and when should you add one? — Back Market interview

Reported in Back Market European engineering loops. SQL performance question covering B-trees, composite indexes, and trade-offs.

Medium Read answer →

Back Market Mid-level (3–5 years) Technical deep dive

#95

Compare ACID and BASE consistency models in databases — Back Market interview

Reported in Back Market European engineering loops. Distributed data question bridging SQL transactions and NoSQL eventual consistency.

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Back Market Fresher (0–1 years) Technical deep dive

#96

Explain common HTTP methods and which are idempotent — Back Market interview

Reported in Back Market European engineering loops. Web fundamentals question essential for API and backend interviews.

Easy Read answer →

Back Market Junior (1–3 years) Technical deep dive

#97

What happens during an HTTPS TLS handshake? — Back Market interview

Reported in Back Market European engineering loops. Security and networking question covering encryption, certificates, and performance.

Medium Read answer →

Back Market Mid-level (3–5 years) Behavioral

#98

Tell me about a project that failed or missed its deadline. What did you learn? — Back Market interview

Reported in Back Market European engineering loops. Behavioral question testing accountability, retrospectives, and growth.

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Back Market Mid-level (3–5 years) Technical deep dive

#99

How do you version a public API without breaking clients? — Back Market interview

Reported in Back Market European engineering loops. API evolution question covering compatibility, deprecation, and communication.

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Back Market Mid-level (3–5 years) Technical deep dive

#100

What is dependency injection and why is it useful? — Back Market interview

Reported in Back Market European engineering loops. Java/Spring staple connecting OOP design to testable service architecture.

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Back Market Fresher (0–1 years) Technical deep dive

#101

What is deadlock and how can operating systems prevent it? — Back Market interview

Reported in Back Market European engineering loops. OS synchronization question covering four necessary conditions and mitigation.

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Back Market Fresher (0–1 years) Technical deep dive

#102

Explain INNER, LEFT, RIGHT, and FULL OUTER JOIN with examples — Back Market interview

Reported in Back Market European engineering loops. SQL fundamentals question for filtering and combining relational data.

Easy Read answer →

Back Market Mid-level (3–5 years) Coding / DSA

#103

How do you perform topological sort on a directed acyclic graph? — Back Market interview

Reported in Back Market European engineering loops. Graph algorithm for task scheduling, build systems, and course prerequisites.

Medium Read answer →

Back Market Senior (5–8 years) System design

#104

Design a distributed caching layer for a high-traffic read-heavy application — Back Market interview

Reported in Back Market European engineering loops. Senior system design combining sharding, eviction, consistency, and observability.

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Back Market Lead / Staff (8+ years) Manager / leadership

#105

Describe a significant technical decision you made and the trade-offs involved — Back Market interview

Reported in Back Market European engineering loops. Lead and senior managerial question on architecture judgment and stakeholder alignment.

Hard Read answer →