Personal details
Yosvel Q.
Technical skills
About
Senior Full-Stack Engineer | Scalable Architecture, TypeScript & Distributed Systems | AI-Augmented Engineering
Full-Stack Engineer with 15+ years architecting and scaling multi-tenant SaaS platforms across fintech, insurance, HR-tech, and manufacturing verticals. Deep specialization in TypeScript, Node.js/NestJS, and Nx monorepo architectures, with a consistent record of cutting latency, hardening security, and leading legacy-to-TypeScript migrations at enterprise scale. Extends core full-stack engineering with production-grade AI agent orchestration (LangChain, LangGraph), building automation into the product itself rather than bolting it on as a side feature.
Core Skills
- AI & Agentic Systems: LangGraph (stateful graphs, Postgres checkpointing), LangChain, Claude API, OpenAI API, Gemini API, pgvector / RAG, LLM extraction & structuring pipelines, prompt eval sets
- Languages: TypeScript, JavaScript (ES6+), SQL, NoSQL
- Backend & Architecture: Node.js (NestJS, Hono, Express), modular monoliths, contract-first APIs (Zod, oRPC, OpenAPI/Scalar), REST, GraphQL, event-driven systems (BullMQ, transactional outbox, Kafka, RabbitMQ), Drizzle, TypeORM, Mongoose
- Frontend: Next.js (App Router, RSC), React, TanStack Query/Table, Zustand, Redux, Angular (NgRx, RxJS), Vue/Nuxt (Pinia), Tailwind CSS, shadcn/ui
- Data & Storage: PostgreSQL (RLS, multi-tenant design, pgvector), Redis, MySQL, MongoDB, DynamoDB
- Platforms & SaaS Integrations: Supabase (managed Postgres, storage, migrations), Better Auth, Stripe (subscriptions, metered billing), Resend, Sentry
- Cloud & DevOps: AWS, Google Cloud, Azure, Docker, Coolify (self-hosted PaaS), CI/CD (GitHub Actions, CircleCI), Nx monorepos, Uptime Kuma
- Data Ingestion: Crawlee, Playwright, tiered scraping (API → RSS → HTTP → headless), PDF extraction
- Testing: Vitest, Jest, Playwright, Cypress, pgTAP
Work Experience
- Architected two multi-tenant SaaS platforms as NestJS modular monoliths in Nx monorepos (TypeScript, Next.js, oRPC, Drizzle, Supabase), replacing a legacy ASP.NET/SQL Server facility-management system of 90+ controllers and 140+ tables.
- Enforced row-level tenant isolation with Postgres RLS plus scoped query factories, proven by cross-tenant leakage tests that run through the connection pooler in CI.
- Built a durable event backbone on a transactional Postgres outbox and BullMQ, with idempotent consumers, dead-letter queues and graceful shutdown.
- Established a contract-first workflow where Zod schemas drive DB, API and UI types, with snapshot tripwires that block breaking changes and machine-checked module boundaries.
- Designed an agentic data pipeline with LangChain and LangGraph for tiered ingestion, structured extraction and translation, with a per-run cost ledger and circuit breaker.
- Delivered a responsive Next.js dashboard on shadcn/ui, TanStack Query and Table with keyset pagination and Azure AD sign-in, backed by 690+ Playwright end-to-end tests.
Tech: TypeScript, Node.js, NestJS, Next.js, React, oRPC, Zod, Drizzle, Supabase (Postgres, RLS, Auth), BullMQ, Redis, LangChain, LangGraph, TanStack Query, shadcn/ui, Tailwind, Zustand, Nx, Playwright, Vitest, GitHub Actions
- Migrated legacy Express.js services to a type-safe NestJS/TypeScript Nx monorepo, eliminating a class of runtime errors and easing future scaling.
- Designed and deployed AWS infrastructure (EC2, Lambda, S3, RDS, DynamoDB, IAM) for production workloads.
- Delivered REST APIs with <100ms response times and 99.95% uptime.
Tech: TypeScript, NestJS, Express.js, AWS (EC2, Lambda, S3, RDS, DynamoDB, IAM), Nx, Docker