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Oscar Ruiz
Oscar Ruiz

Senior Full Stack Software Engineer

Open to offers · Member since 22 Oct 2026
Message
Location
Maracay, Venezuela
Desired salary
Unspecified
Work preference
Remote Only / Full Time, Freelance
Experience level
Senior

About

Professional summary

I am a Full Stack Software Engineer with more than seven years of experience building software products across web, mobile, cloud, and desktop environments. I solve business problems through end-to-end technical delivery, from architecture and implementation to deployment and ongoing maintenance.

I have led the development of Toki, a Latin American super app that combines marketplace, payments, social features, real-time messaging, municipal services, and media streaming. My work has covered Next.js and React Native clients, NestJS and Node.js services, AWS infrastructure, and native iOS and Android functionality.

I specialize in TypeScript, JavaScript, Python, PHP, React, Next.js, React Native, Node.js, NestJS, Laravel, and SQL. I am experienced in designing REST APIs, microservices, database schemas, secure payment flows, CI/CD pipelines, and cloud-based systems.

My domain experience includes payments, fintech, fraud prevention, e-commerce, SaaS, ERP integrations, and legacy-system automation. I have implemented QR payments, digital wallets, card processing, recurring subscriptions, ACH billing, transaction screening, risk scoring, biometric authentication, NFC, and device-bound cryptographic signing.

I work effectively with distributed international teams and clients, owning scope, architecture, delivery timelines, and stakeholder communication. I have worked remotely since 2020 with clients and teams in Latin America, Spain, and the United States.

I am fluent in Spanish and English, and I can lead technical meetings, communicate with stakeholders, and produce technical documentation in both languages. I am focused on remote senior full-stack engineering opportunities where I can build reliable, secure, and scalable products.

Skills

41 capabilities
Android DevelopmentAPI DevelopmentCI CDCloud ComputingCloud InfrastructureDatabase DesignDevOpsERP IntegrationFintechFraud PreventionIntegration TestingiOS DevelopmentJavaScriptKotlinLaravelMicroservicesMobile DevelopmentMongoDBMySQLNestJSNext.jsNFCPayment ProcessingPHPPostgreSQLPythonReactReact NativeREST APIsRisk ScoringSaaS DevelopmentServerless ArchitectureSoftware EngineeringSQLStakeholder ManagementSwiftTechnical LeadershipTest Driven DevelopmentTypeScriptUnit TestingWeb Development

Tech stack & tools

Working toolkit

Application Hosting

ApacheSupabase

Development

DockerGit

Mobile

Xcode

Experience

Career history

Full Stack Developer Idelia SpA

I led development of Toki, originally launched as Bacan, a Chilean super app unifying marketplace, payments, social feeds, real-time messaging, and municipal services. I owned delivery across web, mobile, backend, infrastructure, and release automation.

I built React Native mobile applications with Swift and Kotlin native modules for NFC, biometric verification, and Secure Enclave device signing. I developed the Next.js web platform and NestJS backend, implemented payment features with Transbank, QR payments, and digital wallets, and delivered AWS serverless HLS video processing. I designed MongoDB and Supabase data layers, containerized services with Docker, maintained CI/CD pipelines, and automated mobile releases with Fastlane.

Full Stack Developer Independent Consultant

I deliver end-to-end web and mobile products for international clients in the United States, Spain, Peru, and Chile. I own project scope, system architecture, timelines, and stakeholder communication in both English and Spanish.

I built Node.js and TypeScript backend services for banking and anti-fraud providers, including real-time transaction screening and risk scoring. I also developed KOPAPLAY and SQUAAD, sports-management SaaS platforms using Laravel, React Native, Next.js, TypeScript, Supabase, Authorize.Net, and PayPal for registrations, payments, subscriptions, scheduling, digital identities, and live operations.

Full Stack Developer Neoma SpA

I worked as a core developer on Omnico, a commercial ERP platform. I contributed across the product stack to support business operations and commercial workflows.

I delivered the ReactJS web client, React Native mobile application, and Laravel REST backend. My work involved building user-facing interfaces, mobile functionality, and backend API capabilities for the ERP system.

Full Stack Developer Limonbyte

I developed ReactJS frontend applications that consumed a Laravel-based microservices API layer. I contributed to web products requiring coordinated frontend and backend delivery.

I also designed and implemented backend microservices, defining service boundaries, authentication mechanisms, and communication between services. This work strengthened my experience with distributed application architecture.

Web Developer Tecno D2

I developed and maintained web applications for client projects. My work focused on implementing functional, maintainable web features and supporting existing applications.

I used Laravel, PHP, JavaScript, and MySQL to build frontend and backend functionality. I contributed to application maintenance and delivery for client-facing web systems.

Education

Learning history

Universidad Bicentenaria de Aragua

B.Sc. in Systems Engineering, Systems Engineering

In progress. Expected completion in 2030.

Universidad Nacional Experimental Politécnica de la Fuerza Armada (UNEFA)

Systems Engineering coursework, Systems Engineering

Completed four semesters of core Systems Engineering coursework.

Platzi

Professional Certifications, Backend Development, Frontend Architecture, HTML and CSS

Completed professional certifications in Backend Development with PHP, Frontend Architecture, HTML and CSS, and CSS Grid Layout.

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