Frontend Engineering
Polished UI systems, responsive layouts, and accessible component foundations.
Full-Stack Engineer
I build polished, accessible, and performant web applications.
Hi, I'm Jeff Villarina. I'm a Full-Stack Engineer with a strong frontend focus, building polished user experiences and reliable full-stack systems with React, Next.js, and TypeScript.
Technologies I Work With
- react
- nextjs
- typescript
- nodejs
- graphql
- tailwind
About Me
Engineering strengths that power polished, performant web applications.
I am a Full-Stack Engineer with a strong frontend focus, collaborating with Product and Design to deliver polished, accessible user experiences.
I own features end to end with React, Next.js, TypeScript, and Node.js, pairing frontend craftsmanship with reliable backend architecture and performance-minded delivery.
Core Strengths
A focused set of capabilities for modern web applications.
Full-Stack Development
API-first architecture, backend services, and data-layer integration.
Accessible UI
Keyboard-friendly navigation, semantic markup, and inclusive interaction patterns.
Performance
Optimized rendering, caching, and delivery strategies for fast first loads.
Responsive Design
Adaptive layouts, mobile-first thinking, and device-agnostic product quality.
Product-Focused Engineering
Systems designed for clarity, maintainability, and collaborative delivery.
Core Stack
Technologies I Master
A polished set of tools for modern web applications, from frontend systems to backend services and data infrastructure.
- Frontend
React
Component-driven UI systems, hooks, and modular frontend architecture.
- Frontend
Next.js
Server components, routing, and performance-optimized page delivery.
- Language
TypeScript
Type-safe codebases, maintainable APIs, and robust developer experience.
- Language
JavaScript
Modern ES6+ patterns, browser features, and runtime optimization.
- Backend
Node.js
Runtime services, APIs, and scalable server-side application logic.
- Backend
NestJS
Structured backend frameworks, typed APIs, and modular services.
- Database
PostgreSQL
Relational data modeling, schema design, and robust query patterns.
- Frontend
Tailwind CSS
Utility-first styling, responsive layouts, and consistent visual systems.
Career Path
Professional Timeline
A concise editorial timeline designed for recruiters and engineering teams to scan quickly.
–
Sold.comFull-TimeFull-stack Engineer
Irvine, CA
- Owned and delivered end-to-end product features using React, Next.js, TypeScript, and NestJS, partnering closely with Product and Design from requirements through production release and ongoing maintenance.
- Built secure billing and subscription services using Stripe APIs and webhooks, designing scalable backend workflows and REST APIs to automate payment lifecycle events.
- Designed and implemented browser-based contract signing workflows with real-time validation, audit logging, and compliance-focused user experiences for high-value business transactions.
- Contributed to a shared Storybook design system, improving component consistency, accessibility, and development velocity while collaborating with designers to maintain a high-quality user experience.
- Developed event-driven SMS and email communication services using Twilio and SendGrid, enabling reliable transactional messaging and customer notifications across the platform.
- Collaborated with Product Managers, UX designers, QA engineers, and fellow developers throughout the software development lifecycle, supporting feature planning, testing, and deployment.
–
Wells FargoFull-TimeWeb Developer 4
Concord, CA
- Built and optimized a real-time customer support chat interface used by thousands of concurrent users.
- Implemented frontend analytics and marketing integrations using Tealium and modular JavaScript patterns.
- Improved UI performance and accessibility, helping applications meet WCAG 2.1 compliance standards.
- Partnered with designers and backend engineers to deliver responsive, pixel-accurate interfaces.
- Participated in code reviews and provided technical support and guidance to junior engineers.
–
AppstemContractFull-stack Engineer
San Francisco, CA
- Modernized a legacy React codebase, improving component structure, performance, and maintainability.
- Implemented token-based design system styles, increasing UI consistency and reusability.
–
GlamCamFull-TimeFull-stack Engineer
San Francisco, CA
- Built and maintained a live video streaming platform using TokBox for real-time broadcasting.
- Designed and implemented GraphQL APIs with Node.js/Express to support authentication, stream metadata, and user data.
- Developed responsive, data-driven React interfaces with real-time updates and state synchronization.
- Supported cloud deployment workflows and contributed to automation efforts to improve system reliability.
–
Gofind.aiContractFull-stack Engineer
Berkeley, CA
- Built mobile features using React Native (iOS) integrated with Node.js/NestJS APIs.
- Integrated third-party APIs (including Facebook APIs) for real-time data ingestion and display.
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LiveAdsContractFull-stack Engineer
San Francisco, CA
- Developed real-time single-page applications to visualize live social data using serverless APIs.
- Implemented GraphQL queries to aggregate and consume data from multiple backend services.
–
Bank of the WestFull-TimeData Analyst
San Francisco, CA
- Built internal reporting tools using SQL and ensured data integrity across teams.
–
Rushmore Loan Management ServicesFull-TimeSupport Specialist
Irvine, CA
- Led internal process automation efforts, improving operational efficiency.