Implementing WebAuthn Passkeys: Inside the FIDO2 Registration Ceremony
Inside the WebAuthn registration ceremony: how challenges are minted, how authenticators create key pairs, and what your backend needs to verify.
Inside Apache Flink's Checkpointing Algorithm: How Exactly-Once State Guarantees Survive Pipeline Failures
How Apache Flink’s distributed snapshot algorithm coordinates barriers across operators, persists state to durable storage, and recovers jobs after failure without losing or duplicating records.
Inside OpenTelemetry's Span Processor: Tail-Sampling and Adaptive Bucket Aggregations
How modern span processors decide what to keep, what to drop, and how to bucket latency without lying to you. We unpack tail-sampling evaluators and adaptive bucket strategies used in OpenTelemetry Collector pipelines.
Inside HashiCorp Vault: Unsealing, Audit Logs, and Transit Encryption
A practitioner’s tour of three Vault primitives engineers touch daily — the Shamir-based unseal flow, the tamper-evident audit log device, and the stateless transit encryption engine — with concrete config and production patterns.
Inside gVisor: How User-Space Kernels Sandbox Containers at the Syscall Boundary
gVisor moves the Linux kernel into userspace to sandbox containers at the syscall boundary, trading raw throughput for a dramatically smaller attack surface.