Short-lived sessions, long-lived workers
Database pool problems often start with unclear ownership. Put the transaction boundary around the work that actually needs it.
3 min read01
Field notes by Osvaldo Demo
Software.
Infrastructure.
The messy middle.
I'm Osvaldo Demo. This is my engineering journal: software, infrastructure, and the decisions that make systems useful and dependable.
Backend architecture · Production reliability · Automation
Featured field note01 / Article
Databases
Short-lived sessions, long-lived workers
Database pool problems often start with unclear ownership. Put the transaction boundary around the work that actually needs it.
Osvaldo Demo3 min read
The journal
Notes from the work.
Load testing is an investigation
A request rate only becomes useful when you know the workload, the constraint, and what the experiment actually demonstrated.
3 min read02
When a worker disappears: leases, retries, and safe recovery
An expired lease does not stop a worker. Make recovery safe by guarding writes, identifying retries, and testing the handoff.
7 min read03
The practice
Make it useful.
Make it dependable.
Good engineering connects the application, the infrastructure, and the people who need both to work.
01
Backend & distributed systems
APIs, domain models, data pipelines, and background work designed to recover.
02
Cloud & platform engineering
Infrastructure automation, delivery systems, migrations, and operational ownership.
03
Performance & reliability
Experiments, observability, and capacity decisions grounded in what the system does.
The person behind the notes
Hi, I'm Osvaldo.
I work where software meets infrastructure. My career has taken me from enterprise Unix and virtualization to backend platforms, cloud migrations, and the everyday decisions that keep products running.
More about my workSomething worth solving?