Distributed Ecommerce
Distributed e-commerce platform with microservices architecture and CQRS, Stripe payments, and Kubernetes deployment.
NestJSNext.jsTypeScriptPostgreSQL
+8
Available for remote work
Hi, I'm
Javier Rojas
Full Stack Engineer
Full Stack Engineer with 2+ years of experience building scalable web applications with React/Next.js and NestJS. Specialized in microservices architectures, CQRS and AI integration in production.
2+
Years experience
React · NestJS
4
Delivered projects
Client work
3+
AI models
Gemini · Claude · OpenAI
50%
Performance boost
Redis + TanStack
JR
Javier Rojas
Full Stack Engineer
React
NestJS
AWS
Docker
GraphQL
LangChain
Tech Stack
My Tech Stack
Frontend, backend, and infrastructure for production-ready products
- React
- Next.js
- NestJS
- TypeScript
- LangChain
- PostgreSQL
- MongoDB
- BullMQ
- Tailwind CSS
- Shadcn UI
- RabbitMQ
- Prisma
- TanStack Query
- Zustand
- Astro
- AWS
- Docker
- Kubernetes
- GraphQL
- Redis
- GitHub Actions
- S3
- Amplify
- Lambda
- SQS
- ECR
- SNS
- Jest
- Vitest
- Deepgram SDK
- Pusher
// stack.config.ts — Javier Rojas
const stack = {
Frontend : ["React", "Next.js", "TypeScript", "Tailwind CSS", "GraphQL", "TanStack Query", "Zustand"],
Backend : ["NestJS", "PostgreSQL", "MongoDB", "Redis", "BullMQ", "RabbitMQ", "Prisma", "GraphQL", "Jest"],
Infrastructure: ["AWS", "Docker", "Kubernetes", "GitHub Actions"]
}
export default stackExperience
Professional Experience
Technical wins focused on delivery, performance, and scale
Full Stack Developer
Key achievements
- Designed and built a financial management API with NestJS 11, async pipeline using BullMQ (3 queues, Redis), SHA-256 deduplication, and ACID transactions in MongoDB.
- Integrated multiple AI providers (Gemini, Claude, OpenAI) via LangChain and Strategy Pattern, implementing prompt engineering v1.6.0 with confidence scoring.
- Implemented Google OAuth2 authentication with JWT HTTP-only cookies and real-time notifications with Pusher.
- Built the frontend with feature-based architecture, Deepgram SDK for voice transcription, and a component system with Shadcn UI + Framer Motion.
Core stack
NestJS 11Next.js 15TypeScriptMongoDBBullMQRedisLangChainGeminiClaudeOpenAIDeepgram SDKPusher
Projects
Projects
Projects where I solved product, architecture, and execution with clear impact
About Me
Learn more about my professional profile
Javier Rojas
Full Stack Engineer
📍 Peru
I'm a Full Stack Engineer with 2+ years of experience building scalable web applications with React/Next.js and NestJS.
I specialize in microservices architectures, CQRS and event-driven systems, with real experience integrating AI models (Gemini, Claude, OpenAI) in production.
Focused on writing clean, well-structured and maintainable code. I enjoy the full cycle: from designing the architecture to deploying on AWS.
Values
Speed with judgment
I move fast without compromising the product's technical foundation.
Impact over complexity
I prioritize solutions that improve operations, product, or user experience.
AI with real utility
I apply it when it reduces manual work or improves an important decision.
Foundations ready to grow
I build systems others can maintain, extend, and scale.
Contact
Open to remote roles, freelance work, and SaaS teams that need fast execution
Recruiters and clients: reach out for full stack roles, backend-heavy work, or short builds