P.01Laravel 13 needs PHP 8.3 and changes CSRF, cache and session defaults. What breaks when you upgrade from 12, in order of risk, with the fixes.
P.02A good Django hire reads the ORM's SQL, knows the support calendar and treats settings as a security surface. A screening plan with tests you can run.
P.03PostgreSQL 14 gets its last release on November 12, 2026. Pick 18 (or 17), choose pg_upgrade or logical replication, and fix what breaks between 14 and 18.
P.04Switching agencies or freelancers? Get repo, cloud, app store and domain ownership in your name first, then audit the code. A step-by-step handover list.
P.05How to hire a developer to audit an app built with an AI tool: what the audit covers, what the report must contain, and how to judge the quote.
P.06Hiring a freelancer or agency does not make you the owner of the code. What the law defaults to in the US and India, and the clauses that fix it.
P.07A paid trial project of 20-40 hours on real backlog work tells you more than any interview. How to scope it, pay for it and score the result fairly.
P.08Use a monotonic clock for durations and timeouts, the wall clock only for timestamps. Python, JavaScript and Go code, plus the leap-second bug that shows why.
P.09Go 1.27 now drains unread HTTP/1 response bodies on Close, so connections get reused. What changes, what to delete, and how to test it in your client.
P.10How gossip protocols spread state across a cluster in log(N) rounds, why Cassandra and Consul use them, and a 20-line simulation you can run yourself.
P.11Two-phase commit makes several databases commit or abort together. How prepare and commit work, why a coordinator crash blocks you, and Postgres examples.
P.12HyperLogLog counts millions of unique visitors in about 12 KB with roughly 0.81% error. How it works, a Python sketch, and Redis PFADD in production.