We are looking for an experienced full-stack developer with strong expertise in React Native and backend development to help identify, troubleshoot, and resolve several issues in our production mobile application. The application is already live, but users are experiencing intermittent problems related to API communication, authentication, and data synchronization. The ideal candidate should be comfortable analyzing both the React Native frontend and the backend services to determine the root cause of bugs rather than simply applying temporary fixes. Your responsibilities will include reviewing the existing codebase, debugging REST API requests and responses, identifying issues related to authentication (JWT/OAuth), investigating server-side errors, optimizing database queries where necessary, fixing inconsistent data returned by the APIs, and ensuring proper error handling throughout the application. You will also be expected to diagnose performance bottlenecks, improve response times, resolve crash reports, and ensure seamless communication between the mobile client and backend services. Experience with Node.js, Express.js or NestJS, PostgreSQL or MongoDB, Firebase, Git, and API testing tools such as Postman is highly desirable. In addition to resolving the current issues, we expect clean, maintainable code that follows industry best practices. Please document the problems you identify, explain the solutions implemented, and provide recommendations for preventing similar issues in the future. Strong debugging skills, attention to detail, and excellent communication are essential. This project may lead to long-term collaboration for future feature development, maintenance, and application enhancements if the initial engagement is successful.

Hello, I’m wanting help from an individual (not an agency) who can assist me in designing, developing and implementing an e-commerce website. I’m wanting to launch an affordable, low cost peptide business that provides customers either 60-80% discounts in exchange for a monthly subscription. Please reach out if this is within your wheelhouse.

We're building the next platform for SBL Nova, a company that already monitors tens of billions of dollars in securities collateral for banks, broker-dealers, and RIAs. The next version of that platform needs to handle collateral that lvives on-chain — tokenized real-world assets, stablecoin settlement, and AI agents that can act on risk in real time instead of just flagging it. We're not hiring someone to build this from a spec doc or a Figma file. We already built a working prototype ourselves — a real Next.js 16 / React 19 / TypeScript app with actual client-side state, a working wallet connect/disconnect flow, a live approve/deny queue for agent actions, working search and filtering, and a functioning notifications inbox. It runs with zero API keys or backend — clone it, npm install, npm run dev, and you can click through the whole thing in under a minute. What it doesn't have yet — and what we need you for — is everything below the surface: - Wiring up a real ERC-4337 smart wallet (ZeroDev, Alchemy Account Kit, or Safe) behind our existing wallet context, replacing our mocked address with a live, session-key-scoped account - Building a real policy engine for our "agentic ops" screen — the UI for approving/denying agent actions already exists, it just needs actual agents behind it reading live testnet events - Pulling real on-chain data into our collateral registry and activity feed via an indexer (The Graph) or an RPC provider (Alchemy/Infura) Standing up and auditing the actual smart contracts our security registry currently mocks (think Slither, Foundry, Echidna) - Replacing our AI risk-scoring mocks with a real model — even a solid heuristic or scikit-learn baseline on real testnet transactions would be a big step up - Adding real authentication, role-based access, and a persistence layer (API + database) so this isn't just in-memory React state anymore What we're looking for: - Someone comfortable across the full stack — Next.js/React/TypeScript on the frontend, and confident building real backend services and APIs - Solid hands-on experience with EVM chains (we're targeting Ethereum, Arbitrum, and Polygon zkEVM) and account abstraction / smart wallets - Experience writing or auditing Solidity contracts, or working closely with a security process (Slither/Foundry/Echidna/Certora are all fair game) - Some real AI/ML experience — not "I used ChatGPT," but building and shipping actual models or pipelines, even simple ones - Someone who can look at existing code, understand the shape of a half-built system, and just start extending it — not someone who needs a fully specced ticket for every step How we'll work together: We'll give you the full prototype repo up front so you can see exactly what's already built and exactly where the mocked pieces are. From there we'd want to move in scoped chunks — smart wallet integration first, then the policy engine, then real data feeds — rather than one giant undefined project. Ongoing engagement if it's a good fit, with clear milestones so both sides know where things stand. Looking forward to hearing from you!

We’re looking for a Full-Stack Engineer who actually enjoys owning a product after it ships, not just building features, merging a PR, and disappearing into the internet. Our web app is already live, already has paying/active users, and is continuing to grow. The foundation is there. What we need now is an experienced engineer who can learn the existing system, keep it healthy, solve the weird problems that inevitably show up in production, and help us scale without turning the codebase into a haunted house six months from now. We also work a little differently. Our development process is heavily AI-assisted. We use Claude along with a dedicated AI engineering agent that helps monitor the application, troubleshoot issues, and handle development work. We’re not looking for someone who feels threatened by that, or someone who blindly accepts whatever the AI spits out because “the tests passed.” We want the human in the loop who knows when the AI is right, when it’s confidently wrong, and when a problem needs actual engineering judgment. The Current Stack You’ll be working with: Supabase — database, authentication, and backend services Railway — deployment and production infrastructure Claude + AI engineering tools — development, debugging, and monitoring Whop — plus other third-party APIs and integrations A live production application with real users and real-world edge cases What You’ll Own You’ll become the technical owner and escalation point for the application. That means keeping production stable, investigating bugs, handling customer-reported technical issues, and stepping in when our AI engineering agent hits something it can’t reliably solve. You’ll review AI-generated code when needed, trace issues across the frontend, backend, database, authentication, APIs, and third-party integrations, and implement new features and improvements as the product evolves. We also want someone proactive enough to spot smoke before the kitchen is on fire. That includes monitoring performance and reliability, improving logging and observability, tightening testing and deployment processes, reviewing security and data integrity, checking backups and recovery processes, cleaning up technical debt, and recommending architecture changes when the current setup starts reaching its limits. Just as importantly, you should be able to explain what’s happening to a non-technical founder without requiring a 47-slide architecture deck. You’ll Probably Be a Great Fit If You... Have strong full-stack experience and have maintained real production applications with real users, not just demos or side projects. You should be comfortable jumping into an unfamiliar codebase and figuring out how the pieces connect without needing everything explained line by line. Strong experience with Supabase, SQL/databases, APIs, authentication, third-party integrations, deployments, debugging, and production troubleshooting is important. Experience with Railway is a big plus, although experience running applications on similar cloud platforms translates well. You should also be comfortable working with AI development tools such as Claude, Cursor, GitHub Copilot, or similar tools. The important part isn’t simply knowing how to prompt them. We want someone capable of reviewing AI-generated code critically, catching bad assumptions, identifying security or scalability problems, and deciding what should—and absolutely should not—make it into production. Experience with SaaS products, membership platforms, customer-facing applications, or startup environments is especially useful. Strong English communication matters too. You’ll be working directly with a non-technical founder, so being able to turn “something weird happens when customers do X” into a root cause and sensible solution is part of the job. Hours & Compensation This will start at approximately 20-30 hours per week, at $70-$90 USD/hour, with the intention of building a long-term working relationship. Most normal weeks will probably be closer to five hours. When we’re shipping a larger feature, improving infrastructure, or chasing down an especially stubborn production gremlin, additional hours will be available. We’re particularly interested in engineers based in Latin America because U.S. time-zone overlap makes collaboration easier, but location isn’t a hard requirement. If you’re excellent, reliable, and communicate well, we’re happy to hear from you wherever you’re based. As the product and customer base grow, there’s plenty of room for the role—and the number of hours—to grow with it. When You Apply Please keep it straightforward. Tell us about one live production application you’ve maintained or taken technical ownership of, what the stack looked like, and one difficult production issue you personally diagnosed and solved. Also tell us about your experience with Supabase/Railway and how you currently use Claude, Cursor, Copilot, or other AI coding tools in your development workflow. No need for a novel. We’d much rather hear about a messy production problem you actually solved than read another paragraph about being a “results-driven technology professional.”

We’re an established cybersecurity company building out a multi-tenant SaaS platform (GRC and security tooling). The core product is already live and we’re scaling it. We’re looking for a senior full-stack engineer to take real ownership of the build, not just work tickets. You’ll work directly with the founder, make architecture decisions, and see them through. This is an ongoing role, with a clear path to expanding scope as the product grows. What you’ll own • Feature development across the stack, frontend through database • Multi-tenant architecture: tenant isolation, data segregation, per-tenant access boundaries • Auth, roles, and permissions • Supabase schema design, RLS policies, Edge Functions, Storage • Stripe billing and subscription logic • Third-party integrations (cloud providers, identity, PSA tools) • Clean, secure, maintainable code you’d be comfortable having audited Our stack • Next.js (React, TypeScript) • Supabase (Postgres, Auth, Storage, Edge Functions, RLS) • Stripe • Vercel Must have • A strong track record shipping production SaaS with Next.js and TypeScript • Real multi-tenant SaaS experience. You understand tenant isolation and why it matters, and you’ve implemented row-level security or an equivalent before • Hands-on Supabase, or deep Postgres with the willingness to ramp fast • A security-first mindset. This is a cybersecurity product, so secure defaults, careful handling of sensitive data, and awareness of common web vulnerabilities are non-negotiable • The ability to work independently and own outcomes without hand-holding • Clear written communication and reliable availability during overlapping hours Nice to have • Experience with GRC, compliance, or security tooling • PSA/RMM or MSP-ecosystem integration experience (ConnectWise, HaloPSA, Datto) • Prior work on products that went through SOC 2 or a similar audit

Title: React Native Mobile Developer – Music & Influencer Marketing App (Remote, PST Hours) Description: We’re sound.me, a fast-growing platform at the intersection of influencer marketing and music promotion. We’re looking for a skilled React Native developer to join our remote team and help build the future of music discovery. What You’ll Work On -Building and maintaining cross-platform mobile features on iOS and Android -Integrating with our AWS backend (API Gateway, Lambda, DynamoDB, S3) -Collaborating with designers and product to ship polished, performant UIs -Writing clean, testable, well-documented code Required Skills & Experience -3+ years of React Native development -Strong JavaScript/TypeScript fundamentals -Experience consuming RESTful APIs and working with AWS services -Familiarity with app store deployment (Apple App Connect, Google Play) -Solid understanding of mobile UX patterns and performance optimization Nice to Have -Experience in music tech, creator economy, or social apps -Experience with push notifications, deep linking, and analytics SDKs Requirements -Available during PST business hours -Strong English communication skills -Portfolio or GitHub with React Native work -Must be willing to sign an NDA

We have a healthcare platform that is already in use and are looking for a senior Full Stack Developer to help us review and improve a specific area of the product. This initial task is expected to take around 1–2 hours for an experienced developer and will focus on understanding the current setup, identifying the root cause of an issue and making the right improvement without unnecessary changes. If the collaboration goes well, there will be opportunities to continue supporting the platform as new features, improvements and technical challenges come up. As the platform grows, we are seeing the kind of real-world challenges that come after launch: workflows that need refinement, areas where data flow can be improved, integrations that need attention and new features that require changes across the frontend, backend and database. We are looking for someone who can understand the full system, build thoughtful solutions with technologies like React, TypeScript, Node.js, PostgreSQL and APIs and help us make reliable improvements without creating unnecessary complexity. Experience with healthcare applications, patient portals, SaaS platforms or workflow-based systems is a strong plus. We are also exploring AI-powered improvements such as medical document processing, intelligent search, patient data organization, workflow automation and LLM-based features that can reduce manual work and improve the overall healthcare experience. Experience integrating AI APIs or building AI-assisted products would be valuable.

We are looking for an experienced senior full-stack developer to take over an existing mobile application that is approximately 90% complete. The mobile app is already built, and we now need an experienced developer to bring it across the finish line by fixing bugs, completing the remaining features, optimizing performance, and preparing it for production. In addition to completing the mobile app, we also need help finishing our React web application, so experience with both mobile and web development is required. Required Skills Expert in React Native Expert in React Strong JavaScript/TypeScript experience Experience integrating and maintaining Stripe Experience deploying and managing applications on Heroku Experience working with REST APIs Strong Git/GitHub workflow Experience publishing apps to the Apple App Store and Google Play Experience taking over existing codebases Strong debugging and problem-solving skills Excellent communication skills AI Experience (Required) You must have experience using Claude AI (Anthropic) as part of your development workflow to accelerate debugging, code reviews, refactoring, and feature development. We are looking for a developer who knows how to effectively leverage AI tools to improve productivity while maintaining high-quality code. Responsibilities Review and understand the existing codebase Fix all remaining bugs Complete unfinished features Finish our React web application Optimize performance Complete Stripe integrations Ensure smooth communication between frontend and backend Deploy updates through Heroku Prepare both mobile apps for App Store and Google Play submission What We're Looking For This project is not for a beginner. We need someone who is comfortable stepping into an existing project, understanding another developer's architecture, and delivering a polished, production-ready product. When You Apply, Please Include Links to at least 3 React Native apps you've personally built Links to React web applications you've worked on Your GitHub profile Your hourly rate Your availability over the next 30 days A brief explanation of your experience with Stripe, Heroku, and Claude AI An estimate of how many hours you believe it will take after reviewing the codebase Only apply if you have extensive experience with React Native, React, Stripe, Heroku, and taking over existing projects.

Project Overview Andco Construction is a small but growing GC specializing in retail/commercial interior finish-outs. We need an experienced AI/business automation expert to fully set up, configure, integrate, and optimize our complete tech stack. Current AI/Tech Stack • JobTread (project management, job costing, scheduling) • QuickBooks Online (QBO – accounting & financials) • Google Workspace (Drive, Gmail, Sheets, Calendar) • RingCentral AI Receptionist (call handling, transcription, lead capture) • Website (ANDCOGC.com) for lead capture • Zapier (automation layer) • AI Agents: Grok + Claude (Cowork mode for workflows, bidding, content) Scope of Work (Consultant will handle) • Full initial setup and optimization of JobTread and QuickBooks Online (accounts, templates, chart of accounts, custom fields, sample jobs, basic configuration). • Build robust Zapier automations for seamless data flow across all tools. • Fully optimize and customize RingCentral AI Receptionist for construction workflows. • Develop custom templates (bids, job costing, reports, proposals) in JobTread + QBO. • Create advanced AI agent workflows using Grok + Claude for bidding support, automation, reporting, and admin tasks. • Implement end-to-end automated workflows (see below). • Provide complete documentation, SOPs, and training sessions (1-2 Zoom calls). • Test, troubleshoot, and deliver a polished, ready-to-run system. Key Expected Workflows • Website form / RingCentral AI calls → auto lead creation in JobTread + AI qualification. • Call transcription & notes → auto-logged in JobTread / Google Drive. • JobTread project costs & expenses → real-time sync to QBO for invoicing & financials. • AI-assisted bidding, proposal generation, and scheduling. • Automated reporting, alerts, email rules, and archiving. Milestone Payment Structure (Fixed-Price) Payments released upon your approval of each milestone: 1. Audit, Planning & Basic Setup (JobTread + QBO) – 20% 2. Core Integrations & Zapier Automations – 30% 3. AI Workflows, Templates & RingCentral Optimization – 30% 4. Testing, Documentation & Training/Handover – 20% Budget: $3,000 – $4,500 total (milestone-based). Timeline: 1–3 weeks for complete delivery. Requirements • Proven experience with JobTread setup, QuickBooks Online setup/configuration, RingCentral AI Receptionist, Zapier, Google Workspace, and Claude/Grok-style AI tools. • Construction or small GC automation experience strongly preferred. • US-based preferred for time zone (Dallas, TX).

Faevaa Detail World is a Houston-based, 100% hand car wash and auto detailing company seeking an experienced Full-Stack Website Developer / Web Systems Engineer to build our new website and online customer platform completely from scratch. Our previous website has been removed. There is no existing website to redesign or copy. We will provide new branding, photographs, videos, pricing, service information, policies, company information, and other necessary content. This is not a basic informational website project. We need a developer capable of building a complete digital platform that helps customers discover our services, compare packages, schedule appointments, make payments, purchase memberships and gift cards, shop online, manage their accounts, and interact with our company from one system. We are looking for a long-term developer who can become part of our remote team and continue supporting and improving the platform after launch. What We're Building The website will include approximately 5–10 primary pages, along with service pages, dynamic pages, customer functionality, and required legal/policy pages. Core areas may include: Home About Us Services Individual Service Pages Packages & Pricing Mobile Detailing Memberships Specials & Promotions Online Booking Online Shop Gift Cards Fleet & Commercial Accounts Gallery Reviews & Testimonials Customer Account/Dashboard Contact FAQ Service Areas Terms & Conditions Privacy Policy Refund/Cancellation Policies Membership Terms Other necessary policies Online Booking System Customers should be able to complete the booking process online from start to finish. The booking system should support: Service selection Vehicle type/class selection In-shop or mobile service Add-on services Available dates and times Customer information Deposits or full payment Appointment confirmations Appointment reminders Rescheduling rules Customer appointment history The system should reduce the amount of manual scheduling our staff has to perform. Customer Accounts & Dashboard Customers should have their own account area where appropriate. Their dashboard should allow them to access information such as: Profile information Upcoming appointments Booking history Order history Active memberships Membership status Account information Available self-service options Membership & Subscription System Memberships are an important part of our long-term business model. Customers should be able to: View membership plans Compare membership benefits Select a membership Register their vehicle Subscribe online Be billed automatically Access their membership through their account View membership status Manage appropriate account information Receive member-only offers Manage or cancel memberships according to company policies We currently utilize Zoho for recurring memberships and Zoho Payments, so experience with Zoho APIs and integrations is highly desirable. We want the selected developer to review our existing systems and determine the best technical approach rather than forcing us into unnecessary software. Payments & Checkout The website must support secure online transactions for services, memberships, products, promotions, and other purchases. Payment functionality may include: Deposits Full service payments Recurring membership payments Product purchases Gift cards Promotional offers Coupons Receipts Payment status Refund workflows Applicable taxes You must have experience integrating payment APIs and handling secure online checkout. E-Commerce Store We want a complete online store capable of selling: Auto detailing products Car-care supplies Equipment Branded merchandise Gift cards Promotional offers Other products added in the future The shop should include: Product categories Product pages Shopping cart Checkout Coupons Inventory fields Order confirmations/emails Customer order history Local pickup and/or shipping capabilities where applicable Gift Cards & Promotions Customers should be able to purchase digital gift cards and promotional offers online. Functionality may include: Preset gift-card amounts Custom gift-card values Digital delivery Redemption instructions Coupon codes Expiration rules Promotional landing pages Service upsells Limited-time offers Fleet & Commercial Accounts We also want to generate commercial and fleet business. The website should include a structured fleet/commercial inquiry system capable of capturing information such as: Company information Contact information Number of vehicles Vehicle types Services needed Service frequency Preferred contact method Quote request Photo & Video Gallery We will provide photos and videos showcasing our work. The gallery should support: Before-and-after photographs Detailing videos Customer vehicles Shop/facility photos Promotional videos Categorized galleries Customer media submissions where appropriate Reviews, Referrals & Customer Retention We don't want the customer journey to end when their vehicle leaves the shop. The website should support systems for: Customer testimonials Google review requests Internal customer feedback Referral calls-to-action Post-service thank-you messages Maintenance reminders Membership offers Seasonal promotions Repeat-service campaigns CRM & Lead Management Every meaningful customer inquiry should be captured instead of disappearing into an email inbox. We want a system where: A customer submits a form, begins checkout, requests information, or schedules a service. Their information is captured in the CRM. The system identifies their lead source and service interest where possible. Confirmation communication is automatically sent. Incomplete bookings can receive approved follow-up communication. Booked customers receive reminders and service-preparation instructions. Completed customers receive thank-you and review communications. Existing customers can receive approved membership, maintenance, and promotional campaigns. Email automation is required, with SMS integration being highly desirable. The underlying proposal similarly calls for lead capture, CRM records, automated confirmations, incomplete-booking follow-up, appointment reminders, post-service review requests, and future membership/seasonal offers. Local SEO & Tracking The website must be properly structured for search engines and future growth. We need: Technical SEO Local SEO foundation Page metadata Schema markup XML sitemap Search-engine indexing Google Analytics 4 Google Search Console Conversion tracking Service-area architecture Scalable local landing pages Image optimization Performance optimization We want to be able to expand into additional Houston-area service areas and potentially additional locations/services without rebuilding the website architecture. Performance, Security & Backups The developer will also be responsible for establishing appropriate: Website security SSL Login protection Backups Database protection Caching Image compression Performance optimization Error monitoring Updates Browser compatibility Mobile optimization Responsive Design The website must work properly across: Desktop Laptop Tablet iPhone Android Modern browsers and common screen sizes We want a polished, premium automotive appearance—not a generic template with our logo inserted. Our branding and creative team may provide graphics, photographs, videos, promotional assets, and other materials for you to incorporate. Technology We are open to professional recommendations regarding the final technology stack. A previous technical concept considered WordPress/WooCommerce together with booking, subscriptions, CRM, automation, SEO, analytics, security, and performance tools. However, we are not requiring a developer to use that exact stack. We want an experienced full-stack professional who can review our requirements, hosting environment, Zoho systems, payment requirements, expected traffic, maintenance needs, and future expansion plans and recommend the most appropriate architecture. If WordPress/WooCommerce is best, explain why. If custom development or another framework is better, explain why. We are hiring an expert because we want you to help architect the solution. Complete Production Deployment We need someone capable of handling the project from: Architecture → UI/UX → Development → Integrations → Testing → Deployment → LIVE Production Website A project is not complete because a homepage design looks good. It is complete when customers can actually use the website. Before launch, functionality must be thoroughly tested, including: Booking Payments Memberships Customer accounts Checkout Coupons Gift cards Forms CRM Emails Mobile responsiveness Links Security Performance Analytics Conversion tracking The expected finished system includes a responsive website, booking and payments, e-commerce, memberships, CRM/customer automation, fleet forms, technical/local SEO, analytics, performance optimization, security, and administrative ownership. Long-Term Relationship This is not intended to be a developer who builds the website and disappears. After launch, we'll continuously need: New landing pages Website updates Promotions New products Membership changes New services API integrations Bug fixes Security updates Performance improvements Conversion improvements New functionality Future business expansion You'll collaborate with our CEO and other remote team members through Slack, Zoom, RingCentral, email, phone, and other company systems. For the right person, you'll become our go-to web developer and web systems partner. Engagement Structure Remote Central Time availability strongly preferred Houston-area developers are a plus Long-term Upwork hourly contract Start ASAP This engagement is hourly—not milestone-based or fixed-price. Work will be tracked and paid based on actual hours worked through Upwork. We're open to an exceptional individual developer or an experienced development team, provided there is clear accountability and a consistent primary point of contact. Who We're Looking For We want proven experience in: Full-stack development Front-end development Back-end development UI/UX implementation Database architecture API integrations Payment systems Subscription billing Customer portals Authentication Booking systems E-commerce CRM integrations Automation Hosting/server administration Website security Production deployment Technical SEO Analytics and conversion tracking Experience developing platforms for service businesses, automotive companies, appointment-based businesses, membership businesses, or e-commerce operations is a major plus. Required Application Questions Please answer these questions instead of submitting a generic proposal: What comparable booking/e-commerce/membership websites have you personally developed? Please provide links. Have you built customer dashboards and recurring subscription systems? What payment APIs have you integrated? Do you have experience with Zoho APIs, Zoho Payments, Zoho CRM, or Zoho Subscriptions? How would you architect a system combining booking, payments, memberships, customer accounts, e-commerce, CRM, and automation? What technology stack would you recommend and why? Can you handle front-end, back-end, databases, APIs, hosting, testing, and deployment? What experience do you have with automated customer follow-up and CRM workflows? Are you comfortable working inside our server/hosting environment? What is your Central Time availability? Are you available for a long-term hourly Upwork engagement after the initial website launches? How soon can you start? Our Goal We don't simply want another website. We want Faevaa Detail World's complete digital customer platform. A customer should eventually be able to find us online, learn about our company, compare services and pricing, see our work, book their vehicle, select add-ons, pay, purchase a membership, manage their account, buy products or gift cards, contact us about fleet services, receive reminders and follow-ups, and return to us for future services—all through one connected system. If you have the experience to design, architect, develop, integrate, launch, and continuously improve that type of platform, we want to speak with you.