Valentina C.
✓ Vetted CrafterSenior Software Engineer – Maintenance & Performance
I refactor and optimise — making old code fast and maintainable again.
About
I specialise in taking over legacy systems and making them better: refactoring tangled code, optimising slow queries, and introducing modern practices without big-bang rewrites. Cursor helps me understand unfamiliar codebases and generate safe refactors. I have reduced bundle sizes by 50%, fixed N+1 queries that were killing performance, and extracted reusable modules from monoliths.
My approach is incremental: profile first, fix the biggest wins, add tests, then iterate. I use Chrome DevTools for frontend profiling, EXPLAIN ANALYZE for PostgreSQL, and Redis for caching layers. I have also maintained production systems — fixing bugs, updating dependencies, and keeping services stable.
I work with TypeScript, React, Node.js, and PostgreSQL. I care about performance budgets, lazy loading, and database indexing. The goal is always to make the system faster and easier to change.
AI Expertise
Notable Projects
Legacy Dashboard Performance Overhaul
Optimised a 5-year-old React dashboard: reduced bundle from 2.1MB to 800KB with code splitting, fixed 12 N+1 queries, added Redis caching. Refactored 40 components for lazy loading. Used Cursor for test generation.
✓ Load time 8s to 1.5s; user-reported slowness tickets down 75%; team can now add features without fear.
API Response Time Optimisation
Reduced P99 API latency from 4.2s to 320ms for a reporting service. Added database indexes, query optimisation, and response caching. Refactored aggregation logic that was recalculating on every request.
✓ P99 320ms; timeout errors eliminated; customer satisfaction with API improved 35%.
Monolith Module Extraction
Extracted a notifications module from a Node.js monolith. Refactored 3,000 lines, added proper interfaces, and migrated without downtime. Used feature flags for gradual rollout.
✓ Module now independently deployable; reduced coupling; zero incidents during extraction.
Work Experience
Senior Software Engineer
Satellogic
2022 – Present
Lead maintenance and performance for internal platforms. Refactored legacy code, optimised data pipelines, and introduced modern tooling. Use AI tools to accelerate refactoring. Reduced tech debt by 40%.
Software Engineer
Mercado Libre
2019 – 2022
Maintained and optimised e-commerce features. Fixed production bugs, refactored legacy React components, and improved API performance. Introduced performance monitoring.
Education & Certifications
Lic. Ciencias de la Computacion
Universidad de Buenos Aires · 2019
Interested in working with Valentina?
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