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I am a fast learner and hands-on engineer with 16+ years of experience designing, building, and scaling high-performance web and mobile applications across FinTech, SaaS, Real Estate, and Enterprise sectors. I specialize in React, React Native, Node.js, TypeScript, and Python, with a strong track record in cloud-native architectures and microservice ecosystems.…

Joel Maria

Full Stack Developer, Web Developer, Back-End Developer, +2

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I am a fast learner and hands-on engineer with 16+ years of experience designing, building, and scaling high-performance web and mobile applications across FinTech, SaaS, Real Estate, and Enterprise sectors. I specialize in React, React Native, Node.js, TypeScript, and Python, with a strong track record in cloud-native architectures and microservice ecosystems.…

Available to hire

I am a fast learner and hands-on engineer with 16+ years of experience designing, building, and scaling high-performance web and mobile applications across FinTech, SaaS, Real Estate, and Enterprise sectors.

I specialize in React, React Native, Node.js, TypeScript, and Python, with a strong track record in cloud-native architectures and microservice ecosystems.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Work Experience

Senior Software Engineer, React Native (Contract) at Spotify

April 1, 2022 - November 14, 2025

Led the Spotify For Authors React Native app for 500M+ users; implemented Next.js 15 App Router, TypeScript, and Node.js. Optimized startup time by 35% with Hermes architecture and improved GraphQL API performance by 200% through request batching, caching, schema optimizations, and Apollo Client integration.

Lead Frontend Engineer at U.S. Bank

April 30, 2022 - April 30, 2022

Integrated AI-powered voice assistant into a React Native banking app with 20M+ downloads; reduced app size by 15–20% using Android App Bundles, Proguard/R8; Led 22+ engineers in delivering a 90+ component library with 80%+ test coverage.

Fullstack Engineer - Node.js/React.js (Contract) at Grax

January 31, 2020 - January 31, 2020

Launched grax.com with Next.js, Node.js/TypeScript, and Firebase; 100M+ API calls monthly and petabytes of archive data using BigQuery, Kubernetes. Switched to Node.js WebSocket, halving latency, doubling concurrency, zero downtime, $67K+/month saved. Implemented secure OAuth 2.0 authentication with JWT refresh tokens using TypeScript and Axios interceptors for real-time financial transactions.

Senior Software Engineer - Node.js/React at Costar

January 31, 2018 - January 31, 2018

Engineered secure Node.js/Express auth systems with OAuth2, JWT, Okta, and LDAP, supporting 5M+ daily logins. Built 60+ RESTful APIs and a Backend-for-Frontend (BFF) layer unifying microservices across major platforms. Enhanced scalability, resilience, and collaboration through Swagger docs and robust error-handling middleware.

Fullstack Developer - Fraud Detection at Fidelity Investments

March 31, 2016 - March 31, 2016

Built fraud detection microservices with Node.js, Kafka Streams, Redis, and Django, enabling real-time anomaly detection. Integrated external fraud intelligence APIs to automate verification of high-risk transactions and cut false positives. Developed React + D3 dashboards for interactive visualization of suspicious transaction patterns.

Full-stack React.js Developer at Verizon Wireless Solutions

June 30, 2015 - June 30, 2015

Built RESTful microservices in Node.js + MongoDB to manage nationwide cable infrastructure and equipment mapping. Developed cloud management modules for compute, storage, and network automation on Verizon IaaS platform. Enhanced platform scalability and data synchronization across distributed systems.

Senior Mobile Engineer (Contract Role) at Bank of America

February 28, 2014 - February 28, 2014

Developed Turbo Native Module (Kotlin/Swift) including biometrics, ML/OCR scanning for React Native app used by 46M+ users. Led One Returns project across Home Depot stores; Migrated Java monoliths to React microservices, supporting 1.6B+ transactions annually.

CSS3 Lead Developer at TD Ameritrade

November 30, 2012 - November 30, 2012

Built a SASS/Compass framework automating sprite generation and vendor prefixing, cutting load times by 40%. Applied OOCSS + Bootstrap/LESS for modular, maintainable UI architecture. Delivered a hybrid Cordova/Ionic app deployed on Android and iOS.