Freelance Backend Engineers in PasadenaFreelance Backend Engineers in Pasadena
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Aurelien GERIER's avatar
Aurelien GERIER
proLos Angeles, USA
Fullstack Engineer | 14+ yrs Shipping React,Next.js,Node,AI
$50k+
Earned
5x
Hired
4.9
Rating
87
Followers
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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
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27
Cover image for HumanData Web Application
HumanData Web Application
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27
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
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73
Cover image for Breakjobs.ai
Breakjobs.ai
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50
Backend Engineer(2)
Andrew ReVille's avatar
Andrew ReVille
Burbank, USA
Fortune 500 AI tools. Small business prices.
New to Contra
Fortune 500 AI tools. Small business prices.
Cover image for Automate Client Delivery: AI-Powered Solution for Small Busi...
Build in Public Built an entire client delivery engine yesterday. One day. 18 deployments. 6 AI agents. Delivered SAME DAY. Client pays → onboarding auto-fills → they hit submit → six agents start building their website, CRM, emails, chatbot, content, and voice system. In parallel. No human in the loop. First site out of the pipeline? A floral boutique with scroll animations, a working chatbot, and AI-generated images. Live in under 20 minutes. This is what I build for small businesses at BizStack.vip. DM me .
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69
Cover image for Most small businesses pay $2K–$5K/month
Most small businesses pay $2K–$5K/month across 4 different vendors for their website, CRM, email marketing, and social media. None of those vendors talk to each other. BizStack AI bundles all of it — website, CRM, lead automation, email sequences, chatbot, content engine, voice agent — into one subscription starting at $99/month. The secret? AI agents don't bill hourly. 75–90% gross margins. Happy to walk anyone through the math.
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Cover image for Client Website - Bloom Boutique Built
Client Website - Bloom Boutique Built a complete website for a curated floral boutique using BizStack AI's automated delivery engine - designed, animated, and deployed SAME DAY. Delivered: scroll-animated site with fade-in reveals and stat counters, custom Playfair Display + DM Sans typography, AI-generated images via Kie.ai (http://Kie.ai) (no stock photos), lead capture popup, working AI chatbot with 20 industry FAQs, contact form, blog template, full mobile responsiveness, Schema.org (http://Schema.org) structured data, and SEO setup. No templates. No stock assets. Every element custom to the client's brand. Live: bizstack-bloom-boutique.vercel.app (http://bizstack-bloom-boutique.vercel.app)
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24
Cover image for AI-generated premium branded proposal for
AI-generated premium branded proposal for a commercial real estate firm in Detroit. Built the entire 7-page document — cover, situation analysis, deliverables, ROI projections, and pricing. Branded to the client's exact colors, typography, and voice.
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33
Backend Engineer(1)
Yao Xue's avatar
Yao Xue
Los Angeles, USA
Senior Full Stack Software Engineer
Senior Full Stack Software Engineer
Cover image for Buy Automotive Tires Online for Less | SimpleTire
Buy Automotive Tires Online for Less | SimpleTire
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3
Cover image for College Board
College Board
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2
Cover image for SimpleNursing
SimpleNursing
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2
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Backend Engineer(1)
Zach Vaillancourt's avatar
Zach Vaillancourt
Los Angeles, USA
Application Development with a Silicon Valley Engineer
Application Development with a Silicon Valley Engineer
Cover image for Founder: Bloqqit (Developer Oriented CMS)
Founder: Bloqqit (Developer Oriented CMS)
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6
Cover image for OpenAI Agent System
OpenAI Agent System
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7
Cover image for Technical Cofounder: Visual note-taking web app with ChatGPT
Technical Cofounder: Visual note-taking web app with ChatGPT
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15
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Backend Engineer(1)
Jared Bartlett's avatar
Jared Bartlett
Los Angeles, USA
Senior Mobile Engineer | UX/UI Design| React Native, Flutter
New to Contra
Senior Mobile Engineer | UX/UI Design| React Native, Flutter
Cover image for Producer Connect Producer Connect is a farming platform that...
Producer Connect Producer Connect is a farming platform that helps farmers log and track field data including flowmeters, wells, and chemigations. I built the iOS app using SwiftUI and AWS for reliable infrastructure, ensuring secure and scalable performance.
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145
Cover image for Noble Innovations Noble Innovations is a trading card market...
Noble Innovations Noble Innovations is a trading card marketplace app that helps collectors discover, buy, sell, and complete their card collections. I built the iOS app in SwiftUI and Swift with a Node.js backend, integrating secure transactions and collection tracking.
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153
Cover image for Therapy made by Flutter developer The
Therapy made by Flutter developer The Therapy app is built by SolidAppMaker with Flutter, FlutterFlow, React Native, Node.js, React, JavaScript, Swift, Java, and Firebase for seamless iOS and Android Mobile App Development. Solidappmaker combines Flutter, OpenAI, and more to push smart apps forward.
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210
Cover image for Date Night Date Night, a social networking app, connects you...
Date Night Date Night, a social networking app, connects you with individuals who share your interests and values. Constructed on a scalable architecture, the app utilizes cutting-edge mobile development technologies, guaranteeing a seamless and responsive user experience across both iOS and Android platforms. It is integrated with Google Maps for location services and features a sophisticated AI matching algorithm. Since its beta version, Date Night has garnered a substantial user base with positive feedback, and we continue to actively enhance and refine the app.
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144
Backend Engineer(2)
Samuel M's avatar
Samuel M
Los Angeles, USA
Full-stack Developer for your web & iOS needs
Full-stack Developer for your web & iOS needs
Cover image for maarketplace.com — a b2b sneaker marketplace
maarketplace.com — a b2b sneaker marketplace
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12
Cover image for your next project
your next project
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5
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your next project
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4
Cover image for brandskazka.ru — e-commerce for high-end luxury products
brandskazka.ru — e-commerce for high-end luxury products
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16
Backend Engineer(1)
Angushylesh Subburaj's avatar
Angushylesh Subburaj
Pasadena, USA
Backend & AI Engineer · Java · Python · Go · AWS · LLMs
New to Contra
Backend & AI Engineer · Java · Python · Go · AWS · LLMs
Cover image for PDF Data Extraction Engine —
PDF Data Extraction Engine — NLP Backend
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12
Cover image for Beat Battle Platform — CNTNDR
Beat Battle Platform — CNTNDR
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22
Cover image for know-my-health — AWS Infrastructure CLI
know-my-health — AWS Infrastructure CLI Tool
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19
Cover image for Suede — AI-Powered B2B SaaS
Suede — AI-Powered B2B SaaS for Fashion Wholesale
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20
Backend Engineer(2)