Looking for a job

Carlos Tello

@carlostello

Senior Web UI Developer at Globant rebuilding OCLC’s admin platform with React and TypeScript, cutting feature delivery time in half.

Colombia

Message

At Globant, I’m leading the frontend rebuild of OCLC’s user-administration module, replacing a legacy Java 8 and JSP interface with a React and TypeScript application. The work reached functional parity and WCAG 2.1 AA accessibility while reducing UI regression defects by 80%.

I built a Claude Code harness to automate coding and testing tasks, helping cut feature delivery from two sprints to one. I also automate recurring data migration and QA work with Python and AI-assisted workflows.

For Interbanking’s B2B Investments Platform, I delivered a real-time portfolio dashboard for institutional investors and an investment subscription engine. The dashboard load time fell from six seconds to 1.5 seconds, and transaction processing time dropped from 12 minutes to four.

At Disney, I built full-stack telemetry-monitoring features and optimized the dashboard’s rendering, reducing initial load time from four seconds to 2.4. Earlier, I built reporting tools at Uber that cut report rendering from three seconds to 0.5, and mobile wallet modules for COEN Group’s Pako Wallet.

Experience

Work history, roles, and key accomplishments

Senior Web UI Developer

Globant

Jan 2023 - Oct 2026 (3 years 9 months)

Led frontend rebuilds and feature development for enterprise clients including OCLC, Interbanking, Disney, and COEN Group. Achieved significant performance improvements and reduced delivery times through AI-assisted engineering and modern React practices.

React TypeScript Next.js Zustand React Hook Form Redux NodeJS Python Claude Code AI Agents MCP Jest Vitest Grafana React Native Expo GA4 A B Testing WCAG 2.1 AA Docker AWS

Senior Frontend Developer II

Uber

Jun 2022 - May 2023 (11 months)

Built interactive reporting tools and optimized rendering for high-volume datasets, cutting report render times from 3s to 0.5s. Designed reusable filtering architecture and developed Node.js mock services to accelerate frontend delivery.

React TypeScript Chart.Js NodeJS API Design Data Visualization Performance Optimization

Frontend Developer

Cornershop

Sep 2021 - Jun 2022 (9 months)

Rebuilt multistep store-onboarding experience for a grocery-delivery platform, increasing completion rate from 60% to 82%. Architected schema-driven wizard and integrated Google Maps API for location accuracy.

React React Query Google Maps API TypeScript Schema Driven Development

Frontend Developer

Asesoftware

May 2021 - Jun 2021 (1 month)

Delivered React and TypeScript forms and case-management workflows for a government platform, reducing data entry errors from 20% to 1%. Improved accessibility and usability of citizen-facing screens, achieving WCAG 2.1 AA compliance.

React TypeScript Redux Accessibility WCAG 2.1 AA Form Validation

Mid Senior Developer

MAS Global Consulting

Aug 2020 - May 2021 (9 months)

Delivered features across U.S.-based client projects in distributed agile teams, building React/TypeScript front ends and Node.js/Express REST services. Modernized legacy screens and raised test coverage from 50% to 80%.

React TypeScript NodeJS Express MongoDB Redux Jest REST APIs

Full Stack Web Developer

Freelance

Jun 2018 - Jun 2020 (2 years)

Built catalog, booking, and contact features with lightweight backends, increasing client booking conversions by 25%. Managed full client lifecycle and secured 80% repeat business.

NodeJS Express Firebase HTML CSS JavaScript SEO Google Analytics