Backend Engineer | TypeScript | Blockchain | Fintech & DeFi | LATAM → Global Remote

I build high-performance backend systems that drive operational efficiency and real-time decision-making. Over the past 3+ years, I've helped healthcare organizations and fintech startups transition from legacy data pipelines to scalable, event-driven architectures that process critical operations in under 5 seconds.
My technical expertise centers on designing distributed backend systems, real-time architectures, and blockchain-based solutions.
Backend: Python, TypeScript, Node.js, Solidity, FastAPI, Express.js, NestJS, Microservices, REST APIs
Architecture & Patterns: Clean Architecture, DDD, Hexagonal Architecture, Event-Driven Systems, Server-Sent Events (SSE)
Cloud & Infrastructure: Docker, Kubernetes, GitHub Actions, CI/CD, Render
Databases: PostgreSQL, MongoDB, Redis, SQL Server, Turso
Blockchain & Web3: Solidity, Smart Contracts, DeFi protocols
Some highlights of my recent work include:
- Architected real-time hospital census monitoring system using Server-Sent Events, reducing data latency from 15 minutes to under 5 seconds for critical healthcare operations across 15+ hospital services
- Engineered intelligent two-tier polling strategy that decreased database load by 90% while maintaining sub-5-second update latency for a high-complexity clinic
- Optimized oncology patient tracking backend by replacing N+1 query patterns with batch operations, reducing database round trips by 90% across 39 production endpoints
- Developed FastAPI REST API implementing Clean Architecture, achieving 85% more maintainable codebase and reducing developer onboarding time from 2 days to 30 minutes
- Building Kipu, a personal finance product with Clean Architecture DDD (15 business domains), targeting 40% improvement in users' financial awareness through zero-effort expense tracking via Telegram NLP bot
I'm always open to connecting with Engineering Leaders, CTOs, and Tech Recruiters looking for Senior Backend Talent for high-impact remote roles in HealthTech, Fintech, and Blockchain.
Email: juandavidperaltafuentes@gmail.com
Portfolio / Code: github.com/JPeralta-dev