Fullstack Engineer — Lazo
Lazo is building the AI-powered operating system for modern startups — automating everything founders shouldn't have to think about: finance, legal, tax, payroll, and fundraising, all under one roof. You'll have massive ownership and work directly with founders.

The role
The Software Engineer will design, develop, and maintain robust software solutions for the Lazo Platform. You will work across a modern TypeScript and Python stack, building product features that help startup founders manage incorporation, compliance, and accountability in a high-trust, regulated domain.
As part of the product team, you will translate business requirements into scalable technical solutions that drive product growth and improve user experience. You'll collaborate closely with product management, design, and engineering to ship high-quality software in a fast-paced startup environment.
This position reports to the Chief Technology Officer.

Tech stack
Lazo is built as an Nx polyglot monorepo (pnpm workspaces) deployed to Container Apps:
- Frontend — Next.js 16 (App Router,



React Server Components) + React 19 + TypeScript, organized with Feature-Sliced Design (FSD).
- Backend — FastAPI (Python 3.11) with async SQLAlchemy 2.0 over PostgreSQL.
- Data — PostgreSQL per service; Prisma and SQLAlchemy as the ORM seams.
- Testing — BDD/Gherkin across layers: Vitest + vitest-cucumber (TS), pytest-bdd + httpx (FastAPI), Playwright (e2e).
- Infra & delivery — GitHub Actions CI/CD, Docker, Container Apps, Key Vault, OIDC federated auth.

Lazo handles sensitive data — SSNs, EINs, passports, bank accounts, cap tables, tax filings. Security, data integrity, and auditability are the top priorities, ahead of availability, privacy/compliance (SOC 2, GDPR, CCPA), testability, and maintainability.

What you'll do
- Take specs and features all the way to production — backend, frontend, tests, deploy.
- Write Gherkin tests before writing code. A claim that isn't backed by a test

📌 Lazo - Fullstack Engineer (Argentina)
🏢 Silver.dev
📍 Argentina