Freelance Frontend Engineers in California

Freelance Frontend Engineers in CaliforniaFreelance Frontend Engineers in California

Projects People

proCalifornia, USA

Fast-tracking business growth with intuitive interfaces

$25k+: Earned

3x: Hired

5.0: Rating

24: Followers

Fast-tracking business growth with intuitive interfaces

Cover image for Handshake AI Help Center

Handshake AI Help Center

0

13

Cover image for OpenAI x Handshake Codex Creator Challenge

OpenAI x Handshake Codex Creator Challenge

0

12

Cover image for Handshake - AI Outlook Interactive Report

Handshake - AI Outlook Interactive Report

0

15

Cover image for sparkspace.ai + website

sparkspace.ai + website

1

38

Frontend Engineer(7)

Aurelien GERIER

proLos Angeles, USA

Fullstack Engineer | 14+ yrs Shipping React,Next.js,Node,AI

$50k+: Earned

6x: Hired

4.9: Rating

129: Followers

Top

Fullstack Engineer | 14+ yrs Shipping React,Next.js,Node,AI

Cover image for Scalable Digital Platform for Cognitive Testing

Scalable Digital Platform for Cognitive Testing

0

40

Cover image for HumanData Web Application

HumanData Web Application

0

37

Cover image for Braidio

1

57

Cover image for Led delivery of a cloud-native

Led delivery of a cloud-native K-12 student wellness platform that helps counselors monitor wellbeing, surface at-risk students, and act early—balancing product velocity with FERPA/COPPA-aware design and multi-tenant isolation (API RBAC, PostgreSQL RLS, district-scoped analytics). → Owned technical direction and delivery rhythm across a TypeScript monorepo (pnpm/Turbo): backend API, web app, shared packages, DB migrations, CI/CD gates, and staged deploys to GCP (e.g. Cloud Run), aligning engineering work with roadmap and release risk. → Orchestrated an AI assistant for counselors on Google Vertex AI (Gemini): system prompts, safety settings for K-12, function-calling tool design, multi-round tool loops, and strict separation so UI widgets render from verified tool results—not model hallucinations—with tracing/feedback hooks (e.g. Langfuse) for quality and auditability. → Drove access-control and compliance posture for sensitive student data: role/permission middleware, tenant-scoped queries, and defense-in-depth database policies—documentation and evidence suitable for enterprise security reviews (e.g. SOC 2–style narratives). → Partnered on product and program management: phased feature rollout, PR/branch discipline, and clear ownership of scope vs. risk so pilot schools could onboard without compromising data boundaries. → Shaped integrations and platform boundaries: Firebase auth, Neon PostgreSQL + Drizzle ORM, real-time patterns, BigQuery analytics isolation, and operational practices (testing, lint, type-check) that keep the stack maintainable at scale. → Established a disciplined, AI-accelerated delivery model—not ad-hoc prompting: Cursor rules and Claude skills/agents for repeatable workflows; Husky + lint/type-check/test gates; GitHub Actions CI/CD; Cursor Cloud Agents for automated PR review; and daily monitoring of E2E, coverage, and critical issues—owning AI-orchestrated implementation while enforcing accuracy, consistency, and observability

1

499

Frontend Engineer(3)

Christine Straub

Full-Stack AI/ML Software Engineer

$50k+: Earned

1x: Hired

5.0: Rating

78: Followers

Full-Stack AI/ML Software Engineer

Cover image for Chatbot starter with GPT3, Twilio, and React

Chatbot starter with GPT3, Twilio, and React

0

56

Cover image for RAG with AWS Bedrock and

RAG with AWS Bedrock and React

1

760

Cover image for Software Engineer with AI/ML experience

$71K+ earned

Software Engineer with AI/ML experience

2

4

219

Cover image for Creative intelligence & optimisation platform | Dragonfly AI

Creative intelligence & optimisation platform | Dragonfly AI

0

305

Frontend Engineer(1)

Matt Kettelkamp

San Francisco, USA

Web Developer | 3D Developer

63: Followers

Top

Web Developer | 3D Developer

Cover image for Fullstack Web App

Fullstack Web App

3

66

Cover image for I built a custom analytics

I built a custom analytics platform to track usage on projects. We track page views, sources, sessions, bounce rate, custom events, and many more all with just adding a script to the layout of your application.

0

161

Cover image for 3D Interactive Footer

3D Interactive Footer

0

21

Cover image for Opti - 3D ECG Visualization Education Tool

Opti - 3D ECG Visualization Education Tool

13

251

Frontend Engineer(1)

proSan Francisco, USA

❖ Narrative-driven Framer sites for mission-focused brands ❖

$10k+: Earned

14x: Hired

5.0: Rating

240: Followers

Top

expert

+1

❖ Narrative-driven Framer sites for mission-focused brands ❖

Cover image for ❖ Optiwatt - Figma to Framer ❖

❖ Optiwatt - Figma to Framer ❖

3

465

Cover image for CLIPI Historical Archive — Framer D&D

$4.3K+ earned

CLIPI Historical Archive — Framer D&D

2

71

Cover image for ❖ TWYNE - Framer Website ❖

❖ TWYNE - Framer Website ❖

43

1.7K

Cover image for ❖ TEDxBoulder - Framer Site ❖

❖ TEDxBoulder - Framer Site ❖

11

433

Frontend Engineer(1)

proSan Francisco, USA

AI Campaign Assets + Agents for DTC Growth

$100k+: Earned

21x: Hired

5.0: Rating

282: Followers

Top

Partner

+1

AI Campaign Assets + Agents for DTC Growth

Cover image for AriaLeaf AI - AI Voice Agent Platform for Dispensaries

AriaLeaf AI - AI Voice Agent Platform for Dispensaries

1

116

Cover image for GreenOurPlanet Chatbot

GreenOurPlanet Chatbot

0

127

Cover image for GavelGab Law Chatbot

GavelGab Law Chatbot

1

166

Cover image for Crypto Luminary Web App

Crypto Luminary Web App

0

97

Frontend Engineer(4)

Scotty Waggoner

maxOrangevale, USA

Backend-leaning Full-stack & AI Engineer

$25k+: Earned

1x: Hired

7: Followers

Backend-leaning Full-stack & AI Engineer

Cover image for AirPay, a nearby payments app

AirPay, a nearby payments app

0

7

Cover image for Educate to Space

Educate to Space

0

14

Cover image for Ask AI for Foodnoms

Ask AI for Foodnoms

1

27

Cover image for Health Insurance Marketing and Quoting Responsive Website

Health Insurance Marketing and Quoting Responsive Website

0

18

Frontend Engineer(2)

proCalifornia, USA

Websites, workflow apps & product launch visuals

7: Followers

Websites, workflow apps & product launch visuals

Cover image for What if customers could explore

What if customers could explore your product before asking about it? FOLD is an original interactive camera concept by Launch in Seven. Turn it in 3D, try three finishes, unfold the lens, then frame a miniature sculpture garden and save your own postcard. I built the camera, the scene and the working capture flow together. The images here come from the live prototype. We can build a focused interactive launch page or product configurator around your idea. Message me with the product and the interaction you want visitors to try. Fictional product study, not a client commission or physical camera for sale.

3

11

1.1K

Cover image for Imagine sending someone a link

Imagine sending someone a link and saying, “This is my business.” I made this 30-second film for Launch in Seven’s new Business Idea to First Launch service. It shows an illustrative plant-care idea becoming a clear offer, a mobile-friendly page, an inquiry path and outreach drafts. The $1,500 fixed package includes one offer brief, one responsive landing page, one connected inquiry form, three outreach drafts and one consolidated revision. Domain and hosting costs are separate. Scope, inputs and delivery date are agreed before we start. Explore the package or message me with your idea and who it helps: https://contra.com/s/beq6QLOb-business-idea-to-first-launch-landing-page-and-inquiry-form Original illustrative example, not a client commission or sales result. Custom motion, generated imagery, narration and original music.

7

12

2.1K

Cover image for Pace Commons — Running Membership UX & Access Policy

Pace Commons — Running Membership UX & Access Policy

0

4

Cover image for EARTHEN — Prelaunch Commerce & Signup Concept

EARTHEN — Prelaunch Commerce & Signup Concept

0

6

Frontend Engineer(7)