Freelance Backend Engineers in California

Freelance Backend Engineers in CaliforniaFreelance Backend Engineers in California

Projects People

proSacramento, USA

iOS Developer & Designer: From Concept to Completion

$100k+: Earned

5x: Hired

5.0: Rating

31: Followers

iOS Developer & Designer: From Concept to Completion

Cover image for Magic, A Short Form Video Platform

Magic, A Short Form Video Platform

1

34

Cover image for Follk, A Social Platform Experiment

Follk, A Social Platform Experiment

2

59

Cover image for Sage AI Chatbot Development

Sage AI Chatbot Development

2

46

Cover image for UI Development for Bento MacOS App

UI Development for Bento MacOS App

0

1

Backend Engineer(1)

proSan Francisco, USA

AI Campaign Assets + Agents for DTC Growth

$50k+: Earned

19x: Hired

5.0: Rating

189: Followers

Top

Partner

+1

AI Campaign Assets + Agents for DTC Growth

Cover image for Kevin from Home Alone Telegram Bot

Kevin from Home Alone Telegram Bot

1

54

Cover image for Bespoke Punks NFT Platform

Bespoke Punks NFT Platform

1

37

Cover image for Chad: The Ultimate Crypto Degen Bot

Chad: The Ultimate Crypto Degen Bot

1

63

Cover image for Morpheus AI Persona Chatbot

Morpheus AI Persona Chatbot

0

103

Backend Engineer(14)

Aurelien GERIER

proLos Angeles, USA

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

$50k+: Earned

5x: Hired

4.9: Rating

91: 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

27

Cover image for HumanData Web Application

HumanData Web Application

0

28

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

141

Cover image for Breakjobs.ai

0

55

Backend Engineer(2)

Scotty Waggoner

maxOrangevale, USA

Senior TypeScript backend, web, and mobile developer

$10k+: Earned

1x: Hired

6: Followers

Senior TypeScript backend, web, and mobile developer

Cover image for AirPay

0

1

Cover image for Educate to Space

Educate to Space

0

12

Cover image for Ask AI for Foodnoms

Ask AI for Foodnoms

1

20

Cover image for Health Insurance Marketing and Quoting Responsive Website

Health Insurance Marketing and Quoting Responsive Website

0

12

Backend Engineer(3)

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 EMR | EHRHealthcare Application ( HIPAA Compliant )

EMR | EHRHealthcare Application ( HIPAA Compliant )

1

207

Cover image for Empowering Pineapple Farmers through Drone Imagery Analysis

Empowering Pineapple Farmers through Drone Imagery Analysis

1

135

Cover image for The Compliance Space

The Compliance Space

0

68

Cover image for RAG with AWS Bedrock and

RAG with AWS Bedrock and React

1

355

Backend Engineer(3)

proCalifornia, USA

World-Class UX, Full-Stack, Context Engineering

12: Followers

expert

World-Class UX, Full-Stack, Context Engineering

Cover image for Full-stack Micro Web Apps 🖥️🔗⚙️

Full-stack Micro Web Apps 🖥️🔗⚙️

1

16

Cover image for Non-Profit Web Apps 🤲💙🌎

Non-Profit Web Apps 🤲💙🌎

0

5

Cover image for MBM Website, App & Rebranding

MBM Website, App & Rebranding

2

4

Cover image for Tired of paying for multiple tools just to get a basic calen...

Tired of paying for multiple tools just to get a basic calendar and kanban? 🤦‍♂️ So I built YouSoul 🐳 – Vibe Productivity AI Agent Free & Unlimited on YouBase beta. No AI slop. No pricing. No BS. BYO key What’s different? - Ask: “Add call mom tomorrow at 3 pm” - It just happens. - Ask: “What are my high-priority tasks this month?” - Instant answers - Beautiful UI, Underwater visuals, smooth motion, and ambient sounds for focus No more 5+ subscriptions! Powered by YouWare + YouBase Check it out 👇 🔗 App: https://yousoul.app/ (https://yousoul.app/)🔗 YouBase: https://yousoul.youware.app/ (https://yousoul.youware.app/)✍️ LinkedIn Post (https://www.linkedin.com/posts/whoisoak_youwarechallenge-productivity-ai-activity-7409462097467650049-Qwa-?utm_source=share&utm_medium=member_desktop&rcm=ACoAACH0bjUBmfrBHlpPfjSSAdHjfxvQlrU9uYM)

3

7

317

Backend Engineer(2)

Fullstack Dev: Expert in Ruby on Rails & Laravel

Fullstack Dev: Expert in Ruby on Rails & Laravel

Cover image for IFME Password Creation Standards

IFME Password Creation Standards

0

9

Cover image for FormulaFolios Data Processing

FormulaFolios Data Processing

0

1

Cover image for Marketing Tag Managers Setup

Marketing Tag Managers Setup

0

5

Cover image for Style Refresh / Redesign

Style Refresh / Redesign

0

2

Backend Engineer(2)

San Francisco, USA

Frontend Engineer | iOS Developer 🚀

Frontend Engineer | iOS Developer 🚀

Cover image for lanad22/tuiter-react-web-app-5610-fa22

lanad22/tuiter-react-web-app-5610-fa22

0

4

Cover image for lanad22/web-dev-project

lanad22/web-dev-project

0

1

Cover image for lanad22/ios-project-trivia

lanad22/ios-project-trivia

0

7

Placeholder project card media

View more →

Backend Engineer(2)