Q1. What are microservices compared with a monolith?
A microservice architecture structures an application as a set of small, independently deployable services, each built around a business capability, owning its own data s...
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Q2. How do you design a CI/CD pipeline for a microservices application?
Optimise for independent, fast, and safe delivery per service. - Per-service pipelines: each repository builds, tests, and deploys its own service, avoiding a monolith pi...
Q3. When should you not use microservices?
Avoid microservices when: - The domain is still being explored. Wrong boundaries are far more expensive to move than within a monolith. - The team is small. Each service ...
Q4. What is cross-validation and why use it?
Cross-validation repeatedly splits data into training and validation folds to estimate how well a model generalizes. In k-fold, the data is split into k parts; the model ...
Q5. How would you run an A/B test on a landing page?
I start with a hypothesis tied to a metric: for example, moving social proof above the form will lift sign up conversion by ten percent because trust is the main blocker....
Q6. How do you schedule recurring tasks with cron and what are common pitfalls?
cron runs commands on a schedule defined by five time fields: minute, hour, day of month, month and day of week. ```bash # m h dom mon dow command 30 2 * * * /usr/local/b...
Q7. What is GraphQL federation and when do you need it?
Federation lets several teams own separate GraphQL subgraphs and compose them into one graph for clients. Each subgraph declares the entities it owns with a key directive...
Q8. How would you design a test strategy for a microservices system?
Testing a distributed system needs a layered strategy, because full end-to-end coverage does not scale. - Unit tests per service for domain logic, run on every commit. - ...