Freelance Fullstack Engineers in California

Freelance Fullstack Engineers in CaliforniaFreelance Fullstack Engineers in California

Projects People

proSan Francisco, USA

AI Campaign Assets + Agents for DTC Growth

$50k+: Earned

19x: Hired

5.0: Rating

203: Followers

Top

Partner

+1

AI Campaign Assets + Agents for DTC Growth

Cover image for AI-Powered Real Estate Recruiting Site + Digital Twin

AI-Powered Real Estate Recruiting Site + Digital Twin

1

132

Cover image for Hawaiian Electrician Identity: Branding + AI Receptionist

Hawaiian Electrician Identity: Branding + AI Receptionist

1

51

Cover image for Abstract AI Chat: Learn Blockchain with Interactive AI & Docs

Abstract AI Chat: Learn Blockchain with Interactive AI & Docs

2

84

Cover image for Bespoke Punks NFT Platform

Bespoke Punks NFT Platform

1

38

Fullstack Engineer(7)

Aurelien GERIER

proLos Angeles, USA

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

$50k+: Earned

5x: Hired

4.9: Rating

99: Followers

Top

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

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

0

257

Cover image for Breakjobs.ai

0

61

Cover image for WhatsApp & RCS Integrated Platform for ParaVet.live

WhatsApp & RCS Integrated Platform for ParaVet.live

1

36

Cover image for Scalable Digital Platform for Cognitive Testing

Scalable Digital Platform for Cognitive Testing

0

30

Fullstack Engineer(13)

Christine Straub

Full-Stack AI/ML Software Engineer

$50k+: Earned

1x: Hired

5.0: Rating

63: Followers

Full-Stack AI/ML Software Engineer

Cover image for Software Engineer with AI/ML experience

$71K+ earned

Software Engineer with AI/ML experience

2

3

181

Cover image for EMR | EHRHealthcare Application ( HIPAA Compliant )

EMR | EHRHealthcare Application ( HIPAA Compliant )

1

208

Cover image for Brandblast AI

1

112

Cover image for Computerized Adaptive Exam Platform

Computerized Adaptive Exam Platform

1

76

Fullstack Engineer(9)

proSan Francisco, USA

Full-stack Engineer | Applied AI/ML

$25k+: Earned

2x: Hired

5.0: Rating

14: Followers

Full-stack Engineer | Applied AI/ML

Cover image for AutoNAV

0

27

Cover image for Logical Root

0

47

Cover image for AI/ML app to generate product descriptions

AI/ML app to generate product descriptions

0

27

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Fullstack Engineer(1)

Silicon Valley Staff Software Engineer

$10k+: Earned

1x: Hired

5.0: Rating

15: Followers

Silicon Valley Staff Software Engineer

Cover image for Just Enough Prep - AI powered Education Platform

Just Enough Prep - AI powered Education Platform

3

51

Cover image for SmartNews - News Aggregator Mobile App

SmartNews - News Aggregator Mobile App

1

25

Cover image for Software engineering and machine learning coach

Software engineering and machine learning coach

1

39

Cover image for Figma Token Studio - Figma Plugin

Figma Token Studio - Figma Plugin

1

22

Fullstack Engineer(1)

Matt Kettelkamp

San Francisco, USA

Web Developer | 3D Developer

54: Followers

Top

Web Developer | 3D Developer

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

38

Cover image for ChapGen

3

52

Cover image for 3D Interactive Footer

3D Interactive Footer

0

10

Cover image for Opti - 3D ECG Visualization Education Tool

Opti - 3D ECG Visualization Education Tool

11

170

Fullstack Engineer(2)

Anush | Foundrline

maxMountain View, USA

100+ websites & products built and launched in 3–5 weeks.

$100k+: Earned

53x: Hired

4.9: Rating

588: Followers

expert

expert

+7

100+ websites & products built and launched in 3–5 weeks.

Cover image for AI-Voice Agent (SaaS) | React to Framer + Custom UI + Framer

AI-Voice Agent (SaaS) | React to Framer + Custom UI + Framer

1

108

Cover image for Sports Platform: Website & Web App for Tournaments & Training

Sports Platform: Website & Web App for Tournaments & Training

0

16

Cover image for Home Renovation Matchmaking Platform | Web Dev (React + Nodejs)

Home Renovation Matchmaking Platform | Web Dev (React + Nodejs)

1

17

Cover image for Foundrline — Build, Launch & Scale Digital Products

Foundrline — Build, Launch & Scale Digital Products

41

1.7K

Fullstack Engineer(10)

maxSan Diego, USA

Framer Designer & Full-Stack Developer

$25k+: Earned

9x: Hired

4.8: Rating

157: Followers

Top

expert

Framer Designer & Full-Stack Developer

Cover image for I got tired of two

I got tired of two things: the nightly "what should I watch?" paralysis across a dozen streaming apps, and rating systems where a single score doesn't really tell you enough about a film. So I built Quartile (quartilefilm.io (http://quartilefilm.io)), a film discovery and rating platform. The core idea: instead of one ambiguous score, every film is broken into the five elements that actually matter — Plot, Acting (Narration for docs), Cinematography, Novelty, and Ending — each scored on a 1–4 scale: Well Below Average, Below Average, Above Average, Well Above Average. There's deliberately no neutral "average" middle — it forces you to actually take a position on each category instead of lazily defaulting everything to the middle, which keeps the ratings honest. Those five combine into a consistent score out of 10, but you can also see what each category scored, which helps you understand why a film is rated what it is. Sometimes a movie is really good but the ending or the acting is terrible, so the overall score isn't that high — and without the Quartile system you'd have no way to know that, because a single number can't tell you. That's exactly why I built it: I wanted to know why a film was rated what it was. Essentially it's a formula and some real quality control for how a film gets rated. The coolest part is it lets you filter in really cool ways. You can filter by Top in any category — so Top Cinematography shows only films rated Well Above Average (4) there. Top Novelty is one of my favorites, and one of the most unique filters we offer. You can also stack these with genre — so Top Novelty in horror, or Top Cinematography in sci-fi — which is where it gets genuinely useful for finding something specific to your mood. On top of the rating system you can log films you've seen, build and share playlists, and follow other users to see what they're watching. The same way you follow friends with good taste in music to find new songs on Spotify, film is a matter of taste too — you can follow friends with good taste in certain genres to find movies you'll actually like. It's in beta right now. Would love feedback from this crowd and general thoughts. Of course I'd be stoked if you made a profile and started rating movies and building playlists too — I'm going to grandfather in the first active users and give them something really cool on their profile eventually to mark that they were one of the first Quartile users.

15

13

361

Cover image for Quartile - Full Stack Mobile Development

Quartile - Full Stack Mobile Development

1

39

Cover image for Quartile - Fullstack Web App Development

Quartile - Fullstack Web App Development

1

71

Cover image for This is the kind of

This is the kind of thing I build. framerforge.io (http://framerforge.io) turns plain English into production-ready Framer code overrides, designed and developed end to end. Full screen recording below covering the generator, marketplace, Learn hub, and themes.

1

166

Fullstack Engineer(3)