Martina O.

Demo profile

Full-stack Developer - Internal Tools & Admin Panels

Córdoba, Argentina·5+ years·Spanish / English

Bio

I build the tools that operations teams use every day. 5 years creating admin dashboards, data management interfaces, and workflow automation tools. I focus on clarity over flash - good labels, sensible defaults, and dangerous actions that require confirmation. Self-taught, started in customer support and automated myself into engineering. I ask a lot of questions upfront to understand the actual workflow.

Skills

TypeScriptReactNext.jsNode.jsPostgreSQLREST APIs

Work style

Asks sharp questionsPragmaticUX-firstCalm communicator

Portfolio (sample case studies)

Authentication & Authorization Revamp

Sample

Rebuilt auth system with SSO, MFA, and granular permissions. Implemented secure session management and audit logging.

Node.jsPostgreSQL

SaaS Billing & Subscription System

Sample

Designed and implemented complete subscription management with Stripe. Handled proration, dunning, usage tracking, and admin billing tools.

Node.jsPostgreSQL

Search & Filter System Optimization

Sample

Rebuilt product search with faceted filtering, autocomplete, and relevance ranking. Improved search speed by 10x using proper indexing.

PostgreSQLNode.js

High-volume Background Job Processor

Sample

Architected reliable job processing system handling 100K+ tasks daily with proper retry logic, dead letter queues, and observability.

Node.js

Real-time Collaboration Dashboard

Sample

Built multi-user dashboard with live updates using WebSockets and optimistic UI. Handled conflict resolution and implemented robust offline-first architecture.

ReactNode.js