Available for new opportunities

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 Bi**** BV.

Experience

Senior Software Engineer

Bi**** BV

04/2022 - Present
  • 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

Ev****

07/2019 - 03/2022
  • 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

Me***** Li***

07/2018 - 05/2019
  • 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

NI*** SPA

04/2016 - 06/2018
  • 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.

ReactTypeScriptNode.jsPostgreSQL
Active

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.

Vue.jsTypeScriptSystem DesignCI/CD
Completed

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.

ReactNode.jsElasticsearchAWS
Completed

Internal Developer Tooling

Designed and deployed custom CLI tools for project lifecycle management and engineering workflow standardization, reducing onboarding time significantly.

TypeScriptNode.jsCLI Tools
Active

Skills & Tech Stack

Frontend

ReactNext.jsTypeScriptVue.jsTailwind CSSshadcn/ui

Backend

Node.jsExpressPostgreSQLSystem DesignAPI Architecture

Mobile

React NativeCross-platform DevelopmentMobile Architecture

Tools & Practices

Feature FlaggingCI/CDObservability (Sentry, Embrace)Performance OptimizationAI-Driven Development (Cursor, Claude)

Specializations

Fintech & Payment FlowsFull-Stack OwnershipPlatform ReliabilityArchitecture DesignTeam Leadership

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 build fintech products and developer tools with strong engineering execution, thoughtful system architecture, and a bias toward useful, durable software.

Open to meaningful work

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.

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