Alex Rivera
he/himFull-Stack Developer & UI Designer
Crafting polished, high-performance web apps & digital design systems.
Years Experience
Building web apps & design systems
Shipped Projects
For global startups & clients
Client Satisfaction
5-star delivery track record
GitHub Contributions
In the last 12 months
Technical Stack & Core Skills
Categorized technologies, frameworks, and design tools I leverage to build production products.
Frontend Development
Building interactive, accessible, and reactive user interfaces
Backend & Cloud Services
Scalable APIs, authentication, microservices, and databases
UI/UX & Creative Tools
Prototyping, design systems, vector illustration, and developer handoff
DevOps & Engineering Practices
Modern tooling, CI/CD, version control, and team productivity
Background & Engineering Philosophy
I'm a passionate Full-Stack Engineer and UI/UX Designer based in San Francisco. My work bridges the gap between clean engineering architecture and world-class product design.
Over the past 4 years, I've collaborated with early-stage Y-Combinator founders, independent creators, and established tech teams to turn product visions into responsive, accessible, and ultra-fast web applications.
When I'm not writing code or tweaking Figma layouts, you can find me exploring typography, contributing to open-source developer tooling, or brewing specialty pour-over coffee.
Core Specializations
- Modern Web Applications (Next.js, React 19)
- Design Systems & Component Libraries
- REST & GraphQL API Architecture
- Performance & SEO Optimization
- Interactive Micro-Interactions & Motion
Clean Architecture
Modular, typed, and maintainable codebase adhering to best engineering practices.
Fast Performance
Sub-second loading speeds, lightweight bundles, and 95+ Lighthouse scores.
Pixel-Perfect UI
Obsessive attention to typography, spacing, glassmorphism, and micro-interactions.
Fast Turnaround
Agile delivery cycles with rapid prototyping and proactive client communication.
Featured Projects
Production web applications, component libraries, and open-source tools.
Pulse Analytics Suite
Real-time SaaS telemetry dashboard with AI anomaly detection.
An all-in-one cloud monitoring dashboard engineered for dev teams. Features interactive charts, live WebSocket streaming data, team workspace management, and sub-100ms analytics queries.
Zenith UI Component Kit
Ultra-accessible, light-mode-first React UI library with micro-animations.
A comprehensive open-source design system comprising 50+ accessible, fully typed components. Designed for enterprise SaaS applications with strict WCAG AA compliance.
HyperWrite Markdown Editor
Distraction-free desktop & web markdown workspace with cloud sync.
A sleek, minimalist writer's studio with live bi-directional Markdown rendering, local-first offline storage via IndexedDB, and collaborative real-time editing rooms.
Experience & Academic Timeline
Chronological track record of professional software engineering roles and educational qualifications.
Leading the frontend engineering and core design system for high-growth SaaS client applications.
- •Spearheaded redesign of flagship product interface, resulting in a 34% increase in user retention.
- •Engineered reusable component architecture used across 6 cross-functional engineering pods.
- •Mentored 4 junior engineers on TypeScript best practices, modern state management, and unit testing.
Partnered with 12+ startups and design agencies to build MVPs, landing pages, and web applications.
- •Delivered 14 bespoke web applications on time and under budget with 100% 5-star client ratings.
- •Integrated payment workflows using Stripe, webhooks, and Supabase database authentication.
- •Optimized web performance across all projects to consistently achieve 95+ Google Lighthouse scores.
Collaborated with the platform infrastructure team to build internal diagnostic dashboards.
- •Built internal monitoring telemetry views using React, D3.js charts, and REST API microservices.
- •Automated CI/CD pull request preview deployments reducing QA feedback cycles by 40%.
Bachelor of Science in Computer Science
University of California, Berkeley
Focused on Software Architecture, Human-Computer Interaction (HCI), and Distributed Systems.
Honors & Leadership:
- President, Web Development & Open Source Student Club
- 1st Place Winner, CalHacks Annual Hackathon (2021)
AWS Certified Solutions Architect
AssociateIssued by Amazon Web Services
Meta Frontend Developer Professional Certificate
ProfessionalIssued by Meta
Client & Team Feedback
What founders, product managers, and design directors say about collaborating with me.
"Alex is rare engineer who has exceptional taste in design combined with pristine technical execution. He delivered our client dashboard 2 weeks ahead of schedule and it was pixel-perfect."
Sarah Jenkins
Head of Product • VentureFlow Labs
Re: Pulse Analytics Suite
"Working with Alex was the smoothest engineering collaboration our company has had. His communication is crystal clear and his attention to micro-interactions elevated our app immensely."
Marcus Chen
Founder & CEO • HyperWrite Studios
Re: HyperWrite Markdown Editor
"I've never met a full-stack engineer who understands design systems and typographic hierarchy as naturally as Alex. DevCard template is a masterpiece in itself."
Elena Rostova
Design Director • Studio Forma
Re: Zenith UI Kit
Let's build something remarkable together.
Whether you have an upcoming project, freelance inquiry, or just want to connect — my inbox is always open.