José M. Vasquez

Next.js App Router and React in production: a white-label portal serving 3 brands from a single codebase, with design tokens, i18n at scale and in-house testing infrastructure.

• 3-layer tokens: changing a brand's color is a ~11-line diff
• Atomic library shared by 2 web apps and a React Native app
• React to Next.js migration of a production app

• next.js
• react
• typescript
• tailwind
• vitest
• playwright

Two backend stacks, TypeScript/NestJS and Python/FastAPI, over PostgreSQL, Redis and queues. At a regulated fintech I built the payment orchestrator of an online collections site and co-develop an in-house payment gateway on PSE and Bre-B, designed to never charge twice.

• Idempotency, row-level locks and a transactional outbox in the gateway core
• Signed webhooks to merchants and field-level encryption with AES-256-GCM
• One Go connector per rail, the sole owner of that rail's credentials

• nestjs
• fastapi
• go
• postgresql
• redis/valkey
• bullmq

Delivered the AML/KYC validation module of an insurance platform end to end: FastAPI backend, a hexagonal adapter with typed ports, a case inbox and a 4-step wizard.

• Framework-free hexagonal architecture in the domain
• Blocking import-linter contract in CI against regressions
• Post-mortem of a nullable discriminator leaking data across modules

• python
• fastapi
• sqlalchemy
• postgresql
• pytest

CI gates that scope lint, typecheck, tests and build to the merge-request diff, rolled out to two repositories on the same day. Before that, the first CI/CD pipeline of a company that deployed by hand.

• Fails loudly when the change list comes back empty
• Caches only the package-manager store
• 100% conventional commits across 659 commits

• gitlab ci
• github actions
• docker

AI work with an artifact trail: spec-first Claude Code workflows wired into the issue tracker, and product work on an LLM document-extraction platform.

• 403 AI-paired commits across 4 repositories over 10 months
• Audit of a 339-endpoint legacy backend with parallel agents and cross-verification
• A Claude Code skill that turns git history into progress reports

• claude code
• aws bedrock
• python
• fastapi

People leadership across three stages (a team of 3, a team that grew from 3 to 5–6, and a 4–5 person cell) and process leadership with a documentation standard adopted by 5 developers.

• RFC → ADR → backend reality → atomic steps, across 63 features
• Mentorship, technical direction and hiring input
• Requirement templates with technical context from day zero

• rfc
• adr
• jira