Engineering

Technical writing by named senior engineers.

Real architectures we ship. Real trade-offs we evaluate. Real code that runs in production. By engineers under their own bylines — not vendor evangelism.

Posts: 3 published
Authors: Senior engineers
Cadence: Bi-weekly

Library

All engineering posts.

01
AIRAGRetrieval
Hybrid retrieval in production: dense + sparse + filters.
Pure-vector RAG is rarely the right answer at production scale. Here's the hybrid retrieval pattern we ship — dense embeddings + BM25 + metadata filters with reranking — and the failure modes it solves.
Hassan Ali · CORTEX
9 min
Apr 14, 2026
Read the post
02
AWSCloud ArchitectureCompliance
Multi-account AWS topology that survives audit.
Single-account AWS estates eventually hit a regulatory wall. Here's the multi-account topology we ship to enterprises — account purposes, transit gateway, IAM Identity Center, and policy-as-code — designed to survive SOC 2 / HIPAA / PCI audits.
Sarah Mitchell · NEXUS
11 min
Mar 30, 2026
Read the post
03
TerraformIaCPlatformAWS
Terraform at team scale without DynamoDB state locks.
Why we moved off DynamoDB-backed state locks for a 40-engineer Terraform monorepo, and what we replaced them with.
Sarah Mitchell · NEXUS
7 min
Mar 22, 2026
Read the post

Topics

What we’re building on.

AWS2
AI1
RAG1
Retrieval1
Cloud Architecture1
Compliance1
Terraform1
IaC1

Join us

Want to write under your own byline?

We hire senior engineers (G6+) across all 16 departments. Engineers we hire publish under their own bylines.

Open roles Marketing blog

All engineering posts.

Hybrid retrieval in production: dense + sparse + filters.

Multi-account AWS topology that survives audit.

Terraform at team scale without DynamoDB state locks.

Want to write under your own byline?

All engineering posts.

Hybrid retrieval in production: dense + sparse + filters.

Multi-account AWS topology that survives audit.

Terraform at team scale without DynamoDB state locks.

Want to write under your own byline?