QSystem Design · Interview preparation
When should teams use a frontend monorepo?
A monorepo can simplify sharing components, configuration and coordinated changes across multiple apps.
The idea to remember.
A monorepo can simplify sharing components, configuration and coordinated changes across multiple apps. It also needs clear ownership, incremental builds and dependency boundaries to avoid slowing every team.
01Learn by doing
From first example to real project.
Start with the smallest working idea, examine a more detailed example, then look at a real application pattern. Adapt dependencies, error handling and data models to your project.
Basic: separate responsibilities
01 / BEGINNERKeep data access separate from request handling.
async function getProduct(id) {
return productRepository.findById(id);
}Intermediate: use cache with a clear lifetime
02 / INTERMEDIATECache a read with a time to live and invalidate on writes.
const cached = cache.get('catalog');
if (cached && cached.expiresAt > Date.now()) return cached.value;
const value = await database.listProducts();
cache.set('catalog', { value, expiresAt: Date.now() + 60_000 });
return value;Real scenario: resilient search
03 / REAL SCENARIOPaginate and validate input rather than returning thousands of records.
app.get('/api/questions', async (req, res) => {
const page = Math.max(1, Number(req.query.page) || 1);
const limit = Math.min(50, Math.max(1, Number(req.query.limit) || 20));
const result = await searchQuestions({ page, limit, query: String(req.query.q || '') });
res.json(result);
});02Check your understanding
Try it in your own words.
Explain when should teams use a frontend monorepo without looking at the code. Then modify the intermediate example, describe one trade-off and identify when the real-world pattern fits.
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