Josh Mccarthy, Senior Frontend Engineer · React & TypeScript

Description

9+ years building scalable, production-grade web applications for e-commerce and tech companies.

What I bring

Frontend architecture and complex refactoring

End-to-end feature delivery with senior-level ownership

Cross-team collaboration across web, mobile, and backend

Clean, maintainable code with strong testing practices

Recent highlights

Led architectural refactor to integrate a new multi-tenant Consent Management Platform (Didomi) across web and mobile at Ocado Technology

Removed legacy middleware layer, strengthening frontend/backend boundaries

Introduced MSW-based testing standards and New Relic monitoring adopted across teams

I typically work on

React / TypeScript web apps

Frontend architecture and legacy migrations

API integration and full-stack features (Node.js)

Testing strategy and developer tooling

Available for remote and hybrid projects worldwide.

Languages

English
Native or bilingual
Spanish
Fluent

Workplace preferences

Can work on-site

Barcelona (up to 50km)

Ocado Technology
Software Engineer (Frontend)
E-COMMERCE
January 2024 - Today (2 years and 6 months)
Barcelona, Spain
• • Owned end-to-end web delivery of customer-facing features across domains, aligning stakeholders to ship on time
• • Contributed to the removal of a legacy middleware layer, strengthening frontend/backend architectural boundaries
• • Standardised feature discovery and delivery processes (Spikes/Epics), reducing implementation errors and improving cross-team alignment
• • Initiated regular frontend knowledge-sharing sessions to increase collaboration and visibility across teams
React.js Front-End development Typescript redux SASS
Codeworks
Instructor
EDUCATION AND E-LEARNING
January 2023 - January 2024 (1 year)
Barcelona, Spain
Full-stack, JavaScript-based coding bootcamp
- Delivered part-time full-stack JavaScript instruction and mentored students through production-style projects
JavaScript React.js Typescript redux Node.js
Rithum
Software Engineer
E-COMMERCE
January 2023 - January 2024 (1 year)
Barcelona, Spain
E-commerce management system and marketing solution.
- Delivered full-stack features using Node.js and Angular within an e-commerce platform
- Investigated and resolved production issues across frontend and backend systems in AWS-hosted environments
Node.js AngularJS Amazon Web Services Typescript Fullstack

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Bachelor of Science
University of Otago
Bachelor of Science