N+1 query cascades, improper Redis TTLs, missing database indexes, and connection starvation under concurrency.
In serverless environments (Vercel, AWS Lambda), each incoming request can spawn an isolated runtime. If your code connects directly to PostgreSQL without a connection pooler like PgBouncer or Supabase Supavisor, 500 concurrent users will immediately exhaust PostgreSQL's maximum connection limit.
Always place a connection pooler between serverless runtimes and relational databases.
Stress-test your database connections and cache invalidation before traffic hits.
Over 4+ years leading frontend architecture, refactoring monolithic web apps, and partnering with funded founders across Europe and the US.
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