Software developer building production tools that eliminate manual work at scale. Based in Barcelona.
This is the personal portfolio of Leonardo Cuevas, a software developer based in Barcelona, Spain, focused on internal tooling, automation, platforms, and data pipelines. It presents his experience, quantified case studies, and skills.
The site offers a light ("sun") theme and a dark ("moon") theme via the toggle in the navigation. Both present the same content; the dark theme adds a subtle deep-water backdrop. The page is hand-built with vanilla HTML, CSS, and JavaScript (no framework or build step) and demonstrates front-end fundamentals such as smooth scrolling, scroll-triggered motion, a WebGL noise shader, and a custom cursor.
Inherited a single-file userscript nobody could maintain. Rebuilt it as a 40+ module browser extension. How the architecture changed, how the migration ran, and what the tool does for an operations team.
Inherited a data extraction tool with silent bugs causing 18% data loss. Audited it line by line, fixed compounding issues in deduplication and sorting logic, and designed a migration from browser-based manual execution to scheduled cloud functions.
Replaced manual quality audits with a structured scoring platform. Multiple evaluation categories, weighted deductions, real-time dashboards with trend tracking and per-person benchmarking.
Began in operations and investigations, building tools to automate my own workflows — which grew into a dedicated software engineering role.
Processed complex cross-border VAT compliance cases for EU sellers.
Built dashboards and workflow automations for customer satisfaction, metrics, and quality tracking.
Progressed from email support through phone and chat channels. Handled billing, technical troubleshooting, and escalations for a major app store.
Computer Engineering, Software Engineering track (Ingeniería Informática)
Currently pursuing
CFGS Development of Web Applications (Associate Degree equivalent)
