We are seeking a U.S.- or Canada-based developer to provide ongoing management and technical support for a custom React-based SaaS website and application hosted on Vercel, with Supabase supporting the backend. Responsibilities include: Managing React/Vercel deployments Implementing HTML, content, and layout updates Maintaining metadata, canonicals, schema, sitemaps, and robots.txt Ensuring public pages remain crawlable and SEO-friendly Troubleshooting rendering, routing, performance, and indexing issues Supporting GA4 and Google Tag Manager implementation Protecting private application routes from search indexing Working from clear SEO and design instructions Providing reliable ongoing maintenance and documentation Requirements Based in the United States or Canada Strong React and modern JavaScript experience Production experience with Vercel Familiarity with Supabase Strong understanding of technical SEO and semantic HTML Experience with GA4, GTM, schema, redirects, canonicals, and sitemaps Clear communication and dependable availability

Title: Full-Stack SaaS Developer — React + Supabase + Stripe + Anthropic Claude API Description: We are building FreightSignal — an AI-powered freight sales intelligence platform for logistics professionals. The core product is already live at freightsignal.net with a working signal scanner, territory map, partner network page, and marketing site. We need a full-stack developer to build Phase 2: the complete SaaS dashboard with auth, payments, and core product features. What you'll build: User authentication and account management (Supabase Auth, single session security, login notifications) Signal intelligence dashboard — HOT/WARM/WATCH daily lead feed with AI-written outreach per signal Stripe subscription billing ($34/mo and $149/mo plans, 14-day trial, customer portal) Territory configuration — city radius, freight mode, cargo verticals, score threshold Simple pipeline tracker — 6 stages, CSV import, one-click Excel export FreightSignal Connect tab — exclusive partner network, document uploads, admin approval, AI matching Territory intelligence map integration — geofence alerts, trip outreach mode, mobile responsive Customs push engine — CBP AMS data processing, new importer signal cards Tech stack required: React + Tailwind CSS, Python FastAPI or Node.js Express, Supabase (PostgreSQL + Auth + Storage), Stripe, Anthropic Claude API, Netlify + Railway or Render, Leaflet.js + CartoDB What's already built: Live marketing site, working Python signal scanner (120+ RSS feeds), territory map HTML, partner network page, Privacy Policy. You are building the dashboard and SaaS infrastructure around these. What we're looking for: Strong portfolio showing React + Supabase + Stripe SaaS builds Experience with Anthropic or OpenAI API integration Ability to work milestone-based — not open-ended hourly Interest in ongoing work — Phase 3 features available after Phase 2 launch Clear English communication — you will work directly with the founder Budget: $9,500–$17,000 fixed price (milestone-based payments) Timeline: 8–12 weeks Engagement: Looking for a long-term partner, not a one-time hire To apply: Share relevant portfolio links showing SaaS work with auth, billing, and API integrations. Include your fixed price quote and estimated timeline. Detailed technical brief shared after initial screening.

Job Description Project Overview We have a fully code-complete Micro-SaaS platform called BounceBack SMS. The app is an automated missed-call text-back and lead recovery system built using Next.js 15, Tailwind CSS, Twilio API, and Supabase. The repository is isolated, structured, and securely hosted in a private GitHub repository. We are looking for an experienced Full-Stack/DevOps Engineer to handle the production deployment, configure live API pipelines, manage database environment mapping, and ensure the entire setup runs on a frictionless, automated continuous integration/continuous deployment (CI/CD) framework. Scope of Work (Key Deliverables) 1. Infrastructure Mapping & Production Deployment Deploy the Next.js 15 frontend/backend application from our private GitHub repository to production hosting (Vercel/Render). Map and connect production environment variables, database schemas, and connection strings to our live database instance (Supabase/PostgreSQL). Configure a permanent automated CI/CD pipeline (e.g., GitHub Actions or Vercel integration) ensuring any future push to the ⁠main⁠ branch automatically rebuilds and deploys the app flawlessly. 2. Twilio API & A2P 10DLC Compliance Configuration Connect and secure our live Twilio API gateways within the backend architecture. Audit and verify that our messaging endpoints cleanly support incoming webhooks for missed-call detection. Crucial Milestone: Assist and audit our US A2P 10DLC Campaign Registration via Twilio to ensure 100% carrier delivery compliance (Privacy Policy and Terms pages are already live and coded in the repo). 3. Live Stripe Billing Integration Transition our checkout environment variables from Stripe Sandbox/Test Mode into Live Production Mode. Wire up our exact pricing architecture: $0 Setup Fee, 100 Free Leads Usage Trial, transitioning into a flat $19.99/Month Recurring Subscription. Ensure Stripe webhooks are completely listening to successfully provision, pause, or update customer account access tiers inside our database based on subscription state. 4. Handover & Bulletproof Documentation Provide a brief, plaintext ⁠.txt⁠ or ⁠.md⁠ technical handover file outlining the deployed environment structure, a list of active API webhooks, and step-by-step instructions for simple environment variable updates. Required Tech Stack Expertise Frameworks: Next.js 15 (App Router), React, Tailwind CSS Database: Supabase / PostgreSQL (Schema sync, migrations, security policies) APIs: Twilio SMS Gateway (Webhook architecture, A2P 10DLC registration compliance) Payment Rail: Stripe Billing API (Usage-based trials, recurring webhooks) DevOps/Version Control: Git, Private GitHub Repositories, Vercel/Render, CI/CD automation Preferred Qualifications Proven track record deploying independent Micro-SaaS or automation applications. Deep familiarity with strict US telecom carrier A2P SMS delivery guidelines to prevent messaging blocking or spam flags. Obsession with clean environment variable separation—absolutely no hardcoded credentials. Excellent technical communication skills and availability to run live end-to-end integration testing before final milestone sign-off. 🎯 Candidate Screening Questions (Include on Upwork) 1. Briefly describe your experience configuring Twilio webhooks and handling the US A2P 10DLC registration process to ensure high carrier delivery rates. 2. How would you configure Stripe to trigger a recurring $19.99/mo flat-rate subscription specifically after a user consumes exactly 100 free database actions/leads? 3. Confirm that you are comfortable working out of a private GitHub repository and setting up an automated CI/CD pipeline so I never have to manually pay for developer redeployments.

Build polished, performance-conscious React/TypeScript UI for map-driven workflows: 3D entity rendering, real-time status, modal-driven dispatch, complex form ergonomics. Own the UX of multi-step operator flows end-to-end — visual hierarchy, loading/error states, keyboard, accessibility, edge cases. Collaborate on AI-driven features: integrating Claude Agent SDK tool flows, designing prompts and MCP tools, surfacing agent actions and audit logs in the UI. Occasional Python work on FastAPI services when frontend changes need backend hooks. Must-haves 5+ years shipping production React apps with TypeScript. Heavy day-to-day AI tooling — Cursor / Claude / agentic workflows. You move fast with AI, refactor with it, and reason about prompts and tool design (not just autocompletes). Strong UI/UX intuition. You see a Figma or sketch and can ship something that feels right; you push back when the design hurts the user. Works independently and takes initiative — you scope your own work, surface unknowns early, and ship without hand-holding. Detail-oriented — you sweat the loading states, the empty states, the off-by-ones, and the cases everyone else forgot about. Comfort with styled-components, modern hooks, Redux (or equivalent), and careful state design in long-lived single-page apps. Nice-to-haves CesiumJS, Leaflet, Mapbox, or Three.js — anything map / 3D. Python (FastAPI + Postgres) for working across the stack. Experience designing or consuming MCP servers, or building tool-using agents. Real-time / streaming UI experience (SSE, WebSockets, telemetry). A few hard truths before you apply AI is a tool, not a substitute for engineering. We use Cursor and Claude every day, but you still need to understand the code AI produces, debug it when it breaks, and explain trade-offs and decisions when asked. If AI is your only path to a working PR — and you can't defend the PR once it lands — this won't be a fit. You'll inherit complexity. This is a real codebase with history. You'll spend time reading before you write. The bar for "done" is high. "It works on my machine" doesn't ship. We care about edge cases, accessibility, regressions, and the ten things the user might do that you didn't think of. Generic AI-generated cover letters get instant rejection. We can tell. So can the next reviewer.

We’re looking for a designer/developer to visually redesign our landing page: https://www.groupswatcher.com/ The site is built with Next.js. This project is focused strictly on the visual design and user experience, all existing copy will remain the same. Our goal is to make the page feel clean, polished, and premium without falling into the generic “AI-generated SaaS” look. We’re looking for thoughtful typography, spacing, layout, and visual details that feel intentional and distinctive. If you’re confident you can deliver a refined SaaS landing page with a strong, human-designed aesthetic, we’d be interested in working with you. Please include the following in your proposal: 1. The best SaaS website or landing page you’ve designed or developed. 2. The names and prices of our two plans, as shown on our website. This helps us confirm that you reviewed the site before applying.

A true budget of up to $2000. I am looking for a full stack developer (US, Canada based) that can support me 1. backend bug fixes of a mobile and website travel services application. 2. The app has been vibe coded and cannot launch without security, scalable, and stable audit and fixes. 3. There are also bug fixes on the front end that needs attention. 4. Enhancement on API's for two of our features which involve some of the front end bug fixes Happy to give the independent audit that has been done to make sure we are aligned on the work. Please respond with 1. Portfolio 2. Your price range of this type of fixing working on vibe coded apps and websites

Looking for a front-end developer to use AI to build a React web app MVP. App will access Django/Supabase backend through custom endpoints (working with a backend dev). The developer must use AI to code (e.g. Cursor, Claude Code) but personally review code to ensure architectural integrity. IMPORTANT: Expectation is that most JIRA tickets (e.g. connecting a new backend endpoint, adding a new component) will take 1-2 hours of total work. Most of that time is human review of new AI code.

Looking for a React/Supabase developer to build a backend for an existing web app. Responsibilities include implementing user authentication using Supabase Auth and designing a database schema. The ideal candidate will have experience in backend development and a strong understanding of React and Supabase.

We are looking for an exceptional Full-Stack Engineer who enjoys solving challenging technical problems across the entire technology stack—from modern user interfaces to scalable backend services, cloud infrastructure, and AI-assisted software development. This engagement begins as a contract position with strong potential to become a long-term member of our engineering team. What You’ll Be Building This is not a typical CRUD application. You will be working on a technically sophisticated SaaS platform involving: • AI-powered healthcare analytics • Large-scale clinical and pharmacy datasets • Complex SQL and data processing pipelines • Interactive analytics dashboards • Modern React-based user interfaces • High-performance backend APIs • Enterprise system integrations • Cloud-native infrastructure • AI-assisted software engineering workflows If you enjoy designing scalable systems, solving complex technical challenges, and building products that have real-world impact, we’d love to hear from you. Responsibilities You will work closely with our founders and engineering team to: • Design and develop new product features from frontend through backend. • Build intuitive, responsive, and high-performance web applications. • Design scalable backend services and REST/GraphQL APIs. • Design and optimize relational databases and complex SQL queries. • Improve application performance, scalability, and reliability. • Build integrations with external healthcare systems and third-party services. • Participate in architectural and technology decisions. • Debug and resolve complex production issues. • Write clean, maintainable, well-tested production code. • Contribute to engineering best practices and continuous improvement. Required Technical Skills Frontend • React • TypeScript • Modern JavaScript • Responsive web development • Component-based architecture • State management Backend • Expert-level Python • Node.js • FastAPI, Django, or Flask • REST APIs • GraphQL • Authentication & Authorization • Asynchronous programming Databases Strong experience with relational databases including: • PostgreSQL • MySQL • SQL query optimization • Indexing • Performance tuning • Data modeling • Database design Cloud & Infrastructure • Docker • Kubernetes • AWS • CI/CD pipelines • Git Modern AI-Assisted Development We strongly prefer engineers who actively leverage modern AI-assisted software development tools to improve productivity while maintaining exceptional engineering quality. We view AI as a productivity multiplier—not a replacement for software engineering expertise. The ideal candidate understands how to use AI effectively while applying sound engineering judgment, architecture, debugging skills, and rigorous code review. What We’re Looking For We’re looking for engineers who: • Think like software architects—not just programmers. • Can independently solve complex technical problems. • Take ownership of their work. • Write elegant, maintainable, and well-tested code. • Have excellent debugging and troubleshooting skills. • Make thoughtful architectural decisions. • Learn quickly and continuously improve. • Communicate clearly and professionally. • Enjoy working in a fast-moving startup environment. We value engineering excellence, problem-solving ability, and sound technical judgment far more than years of experience alone. Nice to Have Experience with one or more of the following is a plus: • Large-scale analytics platforms • Event-driven architectures • Redis • Elasticsearch • Message queues • Data engineering • Performance optimization • DevOps Required Application Questions To help us identify the strongest candidates, please answer the following questions in your proposal. 1. Describe the most technically challenging application you have built. Please include: • Overall system architecture • Your specific role • Technologies used • The biggest technical challenge • How you solved it • What you would do differently today 2. Which area of software engineering do you enjoy the most, and why? Examples: • System architecture • Backend development • Frontend development • Databases • Performance optimization • Infrastructure • Debugging • AI applications

JOB POSTING: React Developer Needed — Quick Fix on Base44 App ($250 Fixed) We have a web app built on Base44 (React + Vite) that needs three things fixed. The app was working until a recent update broke the routing and login. Should be 1-2 hours of work for someone who knows React. What needs fixing: Remove the auth gate. Right now the app shows a marketing landing page and requires login. We want the home route ("/") to load the dashboard directly — no landing page, no sign-in, no auth redirect. Just open the app and see the dashboard. Restore 4 broken routes. They got renamed and now 404. The page components still exist in src/pages — the routes just need to point to the right paths: /dispatch, /manager-dashboard, /marketing-studio, /digital-agents Verify the app loads clean — sidebar navigation works, no console errors, no 404s. What you need to know: The app is on Base44. There's a Code tab where you can edit the React source directly. Standard React + Vite project structure (src/pages, src/components, src/hooks, src/entities, src/functions). You'll get access to our Base44 account for this one app only. No need to know Base44 specifically — it's just React. The Code tab is a code editor. What we don't need: No new features, no styling changes, no refactoring. Just the three fixes above. An NDA needs to be signed before access is granted. You'll be looking at proprietary code and business logic. Standard stuff — don't share it, don't steal it. $250 fixed price, paid on completion once all three fixes are verified working. Need this done within 24-48 hours. There is room for additional ongoing work. To apply: confirm you understand the three fixes, give your timeline, and confirm you're OK signing an NDA.