Elwin Ernst

Product-minded software engineer, 4+ years shipping SaaS, web, desktop and mobile to production. Now focused on security: building Sytadel Suite, a Zero Trust platform for identity, vaults and audit.

Montevideo, Uruguay Joined on Jul 31, 2026 https://www.linkedin.com/in/elwin-ernst/

Education

Systems Engineering — Universidad Adventista del Plata (grad. 2026)

Work

Product / Software Engineer @ Freelance

Elwin Ernst

Aug 28

Session anomaly detection in a multi-tenant auth service — with the real bugs I hit

#programming #security #typescript #startup

8 min read

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Elwin Ernst

Aug 28

Automated secret rotation with a 24-hour grace window — done right in NestJS + Postgres

#webdev #programming #tutorial #security

8 min read

Elwin Ernst

Aug 23

Harden for the reader: three red flags an AppSec engineer hits on `git clone`

#cybersecurity #github #security #softwareengineering

5 min read

Elwin Ernst

Aug 7

Adding WebAuthn to a multi-tenant NestJS + Next.js app: what nobody tells you

#appsec #webauthn #security #passkeys

11 min read

Elwin Ernst

Aug 5

Building a tamper-evident audit log in NestJS with hash chains

#nestjs #security #typescript #postgres

11 min read

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Elwin Ernst

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Session anomaly detection in a multi-tenant auth service — with the real bugs I hit

Want to connect with Elwin Ernst?

Automated secret rotation with a 24-hour grace window — done right in NestJS + Postgres

Harden for the reader: three red flags an AppSec engineer hits on `git clone`

Adding WebAuthn to a multi-tenant NestJS + Next.js app: what nobody tells you

Building a tamper-evident audit log in NestJS with hash chains