Web development
Go Error Wrapping and Context
Go treats errors as values. A function that can fail returns an error as its last result, and the caller checks it explicitly. Go has no exception mechanism that carries…
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Web development
Finding Regressions with Git Bisect
A regression is a behavior that used to work and now does not. When one appears, you usually know two…
Infrastructure
Diagnosing Docker Container OOM Kills
A container that exits with code 137 has been terminated by a SIGKILL signal, which the operating system uses to…
Web development
Designing Retryable Background Jobs with a Transactional Outbox
When your service changes business data and also needs to trigger background work, you have to keep two systems in…
Web development
How Go Maps Work in Practice
Go's built-in map type is a hash table. A hash table stores key-value pairs and uses a hash function, a…
Web development
Handling Cancellation in Python asyncio TaskGroups
When you run several coroutines at once with Python's asyncio library, you need a way to stop them together when…
Web development
Using the TypeScript satisfies Operator
When you write an object literal and want TypeScript to check that it fits a known shape, the two familiar…
Web development
Replacing Fixed Sleeps in Playwright Tests
A browser test fails on Monday, passes on Tuesday, and fails again in CI. This is a flaky test: it…
Backend & data
Fixing “Database Is Locked” Errors in SQLite WAL Mode
SQLite returns "database is locked" (SQLITE_BUSY) when a connection tries to write but cannot get the write lock in time.…
Web development
Verifying Webhook Signatures Without Breaking Retries
A webhook is an HTTP request a provider sends to your server when something happens: a payment succeeds, an account…
Security
Implementing the OWASP API Security Checklist
The OWASP API Security Top 10 lists the most common and damaging ways APIs fail, published by the Open Worldwide…
Web development
Understanding Maps and Reference Types in Go
When you need to look up a value by a key in Go, a map is the built-in tool. A…
Web development
Go Arrays vs. Slices: Key Differences Explained
When you write Go code that stores a sequence of values, you choose between two built-in types: arrays and slices.…
Web development
Implementing Rate Limiting with Symfony RateLimiter
When your Symfony application exposes endpoints to the public internet, some clients will send more requests than you want to…
Security
Common Authentication Pitfalls for Startups
Your software authenticates someone when it decides whether they are who they claim to be. You implement authentication when you…