// module.04 · engineering

How we build.

The tech stack is a tool. The practice around it is the value. Both are on the record here so you can decide before you talk to us.

// stack.osi

Tech stack, layered.

L7Application
TypeScriptRustGoPythonC++
L6Runtime
Node · Bun · DenoTokioRayWasm
L5Data
PostgresClickHouseKafkaIcebergRedis
L4Platform
KubernetesTerraformArgoNixVault
L3Observability
OpenTelemetryPrometheusLokiTempo
L2Security
OPASPIRECiliumFalcosigstore
L1Compute
AWS · GCP · AzureBare-metalEdge/Cloudflare
// practice.lifecycle

Practice, in phases.

phase.01

Discovery

One-week diagnostic. Repo read, telemetry review, three-hour architecture interview per subsystem. Written report at the end.

phase.02

Design

Design docs before code. ADRs recorded, alternatives considered, constraints named. Reviewed with your senior engineers.

phase.03

Build

Trunk-based development, contract-tested, property-tested. Deployed to a shadow environment before prod.

phase.04

Cutover

Zero-downtime by default. Reconciliation harness runs against both systems until parity is proven, then old system is drained.

phase.05

Handover

Runbooks, on-call training, and a 30-day tail. Success = your team owning it without pinging us.

// hq
Fullerton, CA

2040 Woodbriar Ct · 92831. On-site engagements within Southern California, remote worldwide.

// team
Senior-only

Median 14 years shipping production systems. No junior offshoring, no bench filler.

// posture
SOC2 · HIPAA · PCI

Audited annually. Data-handling controls documented per engagement.