Experience
6+ years of backend-focused production delivery
Senior Backend Engineer
Babio
United States · RemoteOwn backend services and web modules for a fintech / solar-quoting platform, collaborating with product, frontend and operations stakeholders in a remote contractor environment.
- Build and maintain production microservices with FastAPI, MongoDB and Docker, deployed on DigitalOcean with GitLab CI/CD and standardized PR/review practices.
- Design API workflows, validation rules and persistence logic focused on maintainability, reliability and operational support.
- Support portal modules while keeping backend contracts, data flows and release quality aligned across teams.
Senior Backend Engineer
Kloov
Barcelona, Spain · RemoteArchitected and maintained backend microservices for a music-tech platform spanning low-latency APIs, media-heavy workflows and monetization flows.
- Designed Java/Spring Boot and Node.js/NestJS services in TypeScript with GraphQL and REST integrations; defined service boundaries, data models and integration flows for media-heavy product features.
- Architected a green-field NestJS + GraphQL backend with Redis on AWS and DigitalOcean, reaching sub-100ms API latency for artist, event and storefront data.
- Improved API responsiveness, maintainability and release readiness across backend services; integrated Stripe end-to-end (checkout + secure webhooks).
- Automated CI/CD with GitHub Actions and strengthened delivery quality through Cypress E2E tests and repeatable review practices; mentored a 3-engineer squad on coding standards and sprint execution.
Rust ML Engineer
5e Creative Labs
San José, Costa Rica · RemotePart-time AI engineering engagement focused on scripting and experimentation support for model training pipelines.
- Created and modified training scripts in Rust, Go, Python, and TypeScript to support end-to-end AI training workflows.
- Standardized execution scripts and environment automation to improve repeatability across training jobs.
Senior Software Engineer, Backend
Opratel
Buenos Aires, Argentina · RemoteDelivered scalable SaaS backend systems, payment-gateway services and automation tooling for a multi-country carrier-billing platform.
- Designed REST API workflows for payment operations, service automation and real-time observability across distributed microservices in Java/Spring Boot, Node.js and Python.
- Delivered multi-country payment gateway services (Express.js, Fastify and PHP services) processing 1.5M+ micro-transactions monthly.
- Built real-time monitoring and log capabilities with Socket.IO/WebSocket updates and Redis queues, aggregating 20+ microservices and cutting debug time by 40%.
- Implemented multi-tenant RBAC dashboards supporting access control and production operations, sustaining <300ms end-to-end latency at 2k TPS peaks.
- Instituted Dockerized delivery plus GitHub Actions CI/CD and Cypress E2E quality gates, halving release cycles and reducing production bugs by 40%.
Backend / Full-Stack Engineer
TowerHouseStudio
Montevideo, Uruguay · RemoteOptimized backend APIs for mobile-first products connected to React Native and Flutter applications across multiple clients.
- Built and tuned Java/Spring Boot, Node.js and Laravel APIs supporting mobile clients, reducing median response latency by ~40%.
- Integrated Stripe and PayPal flows (checkout, webhooks, subscriptions) with backend logic for PCI-DSS compliance reviews.
- Improved delivery speed through reusable backend patterns, clearer API contracts for mobile clients and automated tests with Jest and PHPUnit.
- Reduced infrastructure spend by ~25% by off-loading heavy processing jobs to AWS Lambda and S3.
Backend Engineer
Vendible
Texas, United States · RemoteBuilt backend services and product features for Web3 / e-commerce workflows, using Node.js, GraphQL, FastAPI and Java/Spring Boot where service requirements demanded JVM APIs.
- Developed FastAPI services with PostgreSQL and deployed workloads on Kubernetes, scaling to 10M blockchain calls per month.
- Engineered multi-chain gateway services in Express.js for Ethereum, Polygon and Solana flows with <300ms latency targets.
- Implemented CI/CD with Bitbucket Pipelines and GitLab; containerized workloads with Docker Compose + Helm and automated tests, SCA scans and blue-green deployments, sustaining 99.9% uptime.
- Supported wallet and product integrations across distributed systems; launched a non-custodial Algorand wallet that onboarded 50k+ users and passed third-party pentests.
Backend / Full-Stack Engineer
Fidecorp
Madrid, Spain · RemoteDesigned backend services with hexagonal architecture patterns, choosing the right stack per module across NestJS, Java/Spring Boot, Django/FastAPI and GraphQL.
- Built a hexagonal backend layered with NestJS, Django, FastAPI and GraphQL, reducing average API latency from 450ms to <200ms.
- Built event-driven services in Node.js, Python and Java with Docker + RabbitMQ for near-real-time FX rate processing.
- Integrated Stripe and PayPal payout flows under PCI-DSS SAQ A requirements and expanded instant deposits to additional markets.
- Shipped React Native iOS/Android apps for multi-currency balances and fee calculations while coordinating API contracts with backend services; added real-time customer-support channels with WebSocket and WebRTC.
Backend / Full-Stack Engineer
TowerHouseStudio
Montevideo, Uruguay · RemotePart-time engagement focused on backend / API hardening and rapid mobile MVP delivery for client projects.
- Built and maintained Java/Spring Boot APIs with Spring Data JPA, backed by JUnit and Mockito test suites.
- Optimized Node.js + Laravel APIs, reducing average response latency by ~35% and improving test coverage.
- Integrated Stripe and PayPal for one-off and subscription payments, reducing checkout abandonment.
- Delivered two cross-platform mobile MVPs in React Native and Flutter, publishing to iOS / Android stores in under eight weeks.
Full-Stack Developer
Easy MGT
Miami, United States · RemoteBuilt Django + PostgreSQL backend services and Vue dashboards for a real-estate SaaS platform.
- Designed Django + PostgreSQL backend services with relational modeling and JWT-based authentication.
- Implemented WebSocket chat features for real-time buyer-agent messaging.
- Improved backend performance through indexing and Django ORM tuning, reducing catalog latency from ~450ms to <250ms.
- Shipped a Vue 2 + Vuex + Vuetify dashboard for listings, leads and analytics workflows.
Full-Stack Developer
Global Ratings
Caracas, Venezuela · RemoteBuilt API layers with Express.js, GraphQL and Java/Spring Boot for investor-facing web platforms at a risk-rating firm.
- Engineered secure Express + GraphQL APIs to serve real-time ratings data with 99.9% uptime.
- Improved backend reliability, query performance and data availability for business users.
- Optimized MongoDB aggregation pipelines, cutting complex report queries from ~4s to <800ms.
- Delivered investor-facing websites with React and a headless WordPress workflow, reducing content update cycles from days to under one hour.