Yausell Ruiz
Senior Software Engineer & Founder
I build high-stakes fintech products with strong engineering execution. Full-stack ownership, system architecture, and AI-driven development are my passions. Currently at Bitvavo.
Experience
Senior Software Engineer
Bitvavo BV
Amsterdam, The Netherlands
- Led delivery of high-impact web and mobile products for crypto trading platform with millions of users
- Delivered self-refund capability reducing support volume by 8%
- Architected cross-stack frontend for core Earn products, enabling concurrent web/mobile feature shipping
- Implemented comprehensive observability metrics improving system responsiveness for high-concurrency flows
Senior Software Engineer
Everon
Amsterdam, The Netherlands
- Led strategic migration from AngularJS to Vue.js, improving maintainability and feature velocity
- Architected custom CLI tool for project lifecycle management standardizing engineering workflows
- Designed feature-toggling architecture enabling safe, decoupled deployments
- Managed high-concurrency systems including PDF generation and mobile architecture
Software Engineer
Mercado Libre
Santiago de Chile, Chile
- Owned full implementation of Guest Contact Form increasing qualified lead conversion
- Engineered geolocation-based ranking strategies improving search relevance
- Spearheaded Price Suggestion feature for vehicle listings optimizing listing quality
- Resolved critical payment and notification workflow issues unblocking platform operations
Senior Frontend Engineer
NISUM SPA Chile
Santiago de Chile, Chile
- Led frontend teams across JavaScript application lifecycles
- Increased unit test coverage from 40% to 85% for core product areas
- Delivered modernization initiatives including server-side rendering and ES6 migration
- Extended internal CLI tooling improving consistency across teams
Projects & Ventures
Fintech Payment System
Built core payment processing infrastructure for a European digital asset exchange. Implemented real-time settlement, wallet management, and compliance frameworks handling millions in daily volume.
EV Charging Platform Migration
Led architectural migration of legacy platform from AngularJS to Vue.js for a leading European EV charging management company serving clients globally.
E-commerce Search & Ranking Engine
Architected geolocation-based ranking strategies and search optimization features for Latin America's leading e-commerce platform, improving relevance and conversion.
Internal Developer Tooling
Designed and deployed custom CLI tools for project lifecycle management and engineering workflow standardization, reducing onboarding time significantly.
Skills & Tech Stack
Frontend
Backend
Mobile
Tools & Practices
Specializations
Core Competencies
- Full-Stack Product Development
- High-Concurrency Systems
- Fintech & Payment Processing
- Performance Profiling & Optimization
- Platform Architecture & Design
- Team Leadership & Mentoring
- Feature Flagging & Deployment
- Cross-Functional Collaboration
Get in Touch
I'm always interested in discussing fintech, system architecture, and building products that matter. Whether it's collaboration, consulting, or just sharing ideas—feel free to reach out.
Based in Amsterdam
Available for remote opportunities, consulting, and collaboration. My preference is flexible work arrangements with impact-driven teams in fintech, developer tools, or high-growth startups.