Backend Engineer – API Integrations, Messaging & Automation UPDATE: We have broadened the desired skillset beyond the messaging interface described below, to include a full-stack aspect as well - essentially, working hand-in-hand with our lead developer to accelerate completion of the overall build. Owning the messaging piece is still a key requirement, although we are looking for someone experienced and flexible enough to assist in other areas - including troubleshooting issues as they arise with clients during our current beta period. Our lead developer needs a capable ally to complete delivery on our timetable. We would love to hear more about why you could be that person. Thank you for your interest! We’re preparing to launch an industry-specific marketing and growth platform designed to help businesses deliver high-performance, data-driven marketing campaigns through intelligent automation. Our platform combines real-time POS data, advanced analytics, AI-powered workflow automation, campaign management, customer engagement tools, and marketing attribution into a single system that helps businesses market more effectively and measure real results. The core platform is essentially complete and in active pilot deployments with select customers. We’re preparing for commercial launch within 60-90 days and are looking for a Backend Integration Engineer – Messaging & APIs to help bring one of our final major capabilities online: integrated SMS and email communications. This is an opportunity to join an exciting pre-launch product at a pivotal stage while working alongside our lead developer on a focused, well-defined engineering project. About the Role Our platform already includes a robust CRM, AI-powered audience segmentation and journey builder capabilities, advanced analytics, and real-time integration with commercial point-of-sale (POS) systems, among other features. The automation engine is designed to create campaigns and customer journeys. Your role is to connect those capabilities to the outside world by integrating the platform with SMS and email providers, building reliable messaging workflows, processing messaging events, and enabling campaign attribution. You’ll become the primary developer responsible for messaging integrations while working closely with our lead developer, who owns the overall platform architecture. Responsibilities * Integrate the platform with an SMS provider already in use by existing pilot customers to support immediate campaign testing (API documentation/access already secured) * Implement the platform's production messaging capabilities for A2P 10DLC SMS and transactional email. * Process inbound webhooks. * Track message delivery, replies, clicks, and opt-outs. * Build campaign attribution using tracked links and landing pages. * Design integrations so additional messaging providers can be added with minimal changes to the platform. * Design the messaging architecture to support future short code implementation. * Integrate with email providers (Mailgun, SendGrid, or similar). * Build clean internal APIs between our platform and external messaging providers. * Write clean, maintainable, production-quality code and documentation. Required Skills * Backend software development * REST API integration * Webhook development and processing * SQL databases * Git * Experience integrating third-party APIs Experience with one or more of the following is highly desirable: * SMS messaging platforms * Twilio * Telnyx * Mailgun * SendGrid * A2P 10DLC * Queue processing * Background workers * Event-driven systems Contract Details This is a part-time contract expected to average approximately 10–20 hours per week over the next 2 months as we prepare for launch. The platform is in active pilot deployments, and this engagement is focused on completing one of the final capabilities before commercial release. While this engagement is intended to achieve a specific pre-launch objective, there may be opportunities for future work if the platform continues to grow and the working relationship is a good fit. Confidentiality Because this project involves proprietary software currently under development, applicants selected for interviews will be asked to sign a mutual Non-Disclosure Agreement before receiving demonstrations, architecture documentation, API documentation, or industry-specific information. To Apply Please answer the following: 1. Tell us about a communications or API integration project you’ve built that you’re proud of. 2. Which SMS and email platforms have you integrated with? 3. Describe your experience building webhook-driven systems. 4. If you were designing a messaging capability that initially supported one SMS provider but might later support several, how would you architect it so the rest of the application wouldn’t need to change? 5. Include links to your GitHub profile, portfolio, or examples of similar backend work, if available. 6. What is your expected hourly rate for this engagement? 7. What is your availability (days, times, etc.) and how soon can you start? To confirm you’ve read this posting in full, please begin your proposal with the words: “Integrated messaging is my world.” We’re looking for someone who enjoys connecting great software to the outside world through clean, scalable integrations. If you’re excited by messaging systems, APIs, and helping launch a SaaS product for real-world success, we’d love to hear from you. # # #

*** IF YOU CONTACT US OUTSIDE OF THE UPWORK PLATFORM PLEASE NOTE IT IS AN AUTOMATIC DISQUALIFICATION!! WE RESPECT THE TERMS OF UPWORK AND WILL NOT ENGAGE. DO NOT CALL OUR OFFICE, ASK FOR OWNERSHIP. WE HAVE BEEN BOMBARDED BY THOSE BYPASSING THE UPWORK PLATFORM & ARE NOT ACCEPTING THOSE CALLS ** We are seeking an experienced, detail-oriented WordPress developer to partner with us in improving, expanding, and optimizing our existing website: www.EuropeanStoneTile.com. This is not a one-time project—we are looking for a long-term collaborator who can help us continuously evolve our digital presence to attract high-end residential clients and luxury B2B projects. 🏢 About Us European Stone & Tile Design specializes in high-end countertop fabrication and installation, slab materials, and custom tile design and installation for kitchens, bathrooms, and luxury spaces. Our clients include discerning homeowners, designers, builders, and developers who expect top-tier craftsmanship and presentation. 🎯 Project Goals Your primary objective is to: Refine and repair the existing website Elevate design and user experience to reflect a luxury brand Increase traffic and lead generation Build SEO-focused content targeting high-value customers Set the foundation for future ecommerce and content expansion 🔧 Scope of Work Phase 1: Site Audit + Fixes Review current website structure and identify issues left by previous developer Fix broken layouts, formatting inconsistencies, and functionality errors on child pages Improve page speed, responsiveness, and performance across devices Ensure consistency in branding, typography, and layout Phase 2: Core Improvements Contact Page Optimization Fix form functionality and improve user experience Optimize for conversions (clear CTAs, lead capture) Gallery Enhancement Rebuild and expand gallery with organized categories: Countertops (quartz, natural stone, porcelain) Kitchens Bathrooms Tile installations Improve image quality, layout, and navigation Enhance internal linking and page structure Phase 3: Content + SEO Development Create and update pages with SEO-driven content Target keywords related to: Luxury countertops Slab countertops Custom tile design High-end kitchen and bathroom installations Develop location-aware and service-based pages Optimize metadata, headers, and on-page SEO structure Align content to attract high-income residential clients and professional partners Phase 4: Page Design + Expansion Design visually compelling, conversion-focused pages Create new service-specific landing pages Ensure all pages are: Desktop, mobile, and tablet optimized Clean, modern, and aligned with luxury branding Ability to present page designs before development is a strong plus Phase 5: Future Development (Long-Term) We are looking for someone interested in growing with us. Future projects include: Video Content Page Showcasing installations, process, and brand story Shopify Integration Selling fixed goods (e.g., materials, accessories) Potential expansion into basic service offerings Ongoing SEO content creation and blog expansion Potential second website build for our construction division: Dogwood Home Remodel ✅ Ideal Candidate We’re looking for someone who: Has strong experience with WordPress development and customization Understands luxury branding and high-end client targeting Has proven ability in SEO-driven page creation Is skilled in both design and functionality Can identify problems and proactively recommend improvements Has experience with conversion-focused web design Is reliable, communicative, and detail-oriented 💡 Bonus Skills Experience integrating Shopify with WordPress Background in home services, construction, or interior design industries Graphic design or visual presentation skills Experience building scalable site architectures 📌 Project Structure Initial work will be performed on a test environment Final implementation will be completed by our internal team Ongoing collaboration expected based on performance 🚀 What Success Looks Like A polished, high-end website that reflects our craftsmanship Increased qualified traffic and lead generation Strong SEO visibility in our target market A scalable platform for future growth and services

# Overview We're a healthcare analytics company with an internal web portal (built in **Next.js 16 / React 19 / TypeScript / Tailwind CSS v4**) that embeds Power BI reports for our partners. The app works, but it was built quickly and needs to be brought up to a **production-quality standard**. It's a small, focused codebase (~2,400 lines), so this is a high-impact, well-scoped engagement — not a sprawling legacy rescue. We're looking for a senior frontend engineer to either **refactor the existingcode or rebuild it from a clean foundation** (your call — we want your recommendation), and to leave us with a maintainable, tested, polished application. # What you'll be working on A single Next.js App Router application that: - Renders a landing/navigation experience and a set of dashboard pages. - Embeds Power BI reports via `powerbi-client-react` ("App Owns Data"). - Reads a small amount of data from Postgres for user settings. **Authentication is fully handled upstream (SSO) and is OUT OF SCOPE.** You will never need credentials, secrets, or access to our production environment. (See "How we work" below.) # Scope of work 1. **Code quality & structure** — Establish a clean, consistent architecture: sensible component structure, strict TypeScript, and tooling (ESLint + Prettier). The repo currently has no linting or formatting setup. 2. **Testing & CI** — Add a testing setup (unit + a few integration/e2e tests for critical paths) and GitHub Actions CI gates (lint, typecheck, test on PR). There are currently **no tests** — establishing this foundation is a core deliverable. 3. **UI / UX polish** — Implement to our provided design direction: responsive layout, proper loading/error/empty states, and a polished feel around the (heavy) Power BI embeds. **We will provide the design/branding** — you implement it well, you don't need to invent the visual identity. 4. **Recommendation up front** — In an early milestone, give us a short written assessment: refactor vs. rebuild, and your proposed approach. **Out of scope:** authentication/SSO, SEO (the app is private and login-gated), backend/Power BI infrastructure, and anything touching production data. # Required skills - Deep, demonstrable experience with **Next.js (App Router)**, **React 19**, and **TypeScript** (strict mode). - **Tailwind CSS** proficiency and a strong eye for implementing designs faithfully. - Experience setting up **testing (e.g. Vitest/Jest + Playwright)** and **CI pipelines (GitHub Actions)** for frontend apps. - A track record of taking quick-build apps to **maintainable, production-grade** quality. ### Nice to have - Prior **Power BI embedding** experience (`powerbi-client-react`, "App Owns Data") - Accessibility (WCAG AA) and frontend performance optimization experience. # How we work (please read) - We operate in a regulated healthcare environment. You will work against a **sanitized copy of the repository** — no real report IDs, secrets, customer data, or production access. All data is mock/synthetic. - **Hourly engagement** via Upwork's tracker, with a cap. We estimate **~40–100 hours**; we'll set a weekly cap and review progress in milestones. - We value clear communication, small reviewable PRs, and your honest technical judgment over just "doing what's asked."

Northstar Healthcare has developed a custom CRM on Supabase/Vercel. We are looking for a developer to come in house and help us with post launch support, as well as "Phase 2" additions and functionality. Ideally this would lead to a permanent position or contract with Northstar. We are not looking for vibcoders, AI coding, or AI integration. We need someone that has experience building custom applications and supporting them.

WordPress Front-End Developer Needed – Interactive "Choose Your Lane" Website Widget & Interactive listing map widget About LLANE & Co LLANE & Co is a boutique real estate brokerage specializing in builder representation, strategic marketing, public relations, digital marketing, and new construction sales. Our website reflects our unique approach to the industry, with every service organized into specialized "Lanes" that represent the different ways we partner with builders, developers, and industry professionals. We're looking for an experienced front-end developer to build a **fully custom, interactive "Choose Your Lane" widget** that will become a centerpiece of our website. # Project Overview We have designed the concept and user experience for this feature and will provide detailed mockups, branding guidelines, copy, and creative direction. We need a developer who can bring the concept to life with clean, responsive code and thoughtful animations. This should feel like a premium, custom-built experience—not a standard accordion or tab section. # Widget Concept The homepage (or designated landing page) will feature multiple "Lanes," each representing a different service offered by LLANE & Co. Examples include: * New Construction Sales Lane * Strategic Marketing Lane * Public Relations Lane * Digital Marketing Lane * Social Media Lane * Consulting Lane * Residential Resale Lane Each lane should be fully interactive. # Desired User Experience As visitors interact with the widget: * Hovering over a lane should create subtle animations. * Clicking a lane should expand it into a larger experience. * The selected lane should become the primary focus while the remaining lanes elegantly minimize or shift. * Relevant content should smoothly animate into view. * Each lane should have its own unique imagery, iconography, headline, and supporting copy. * Each lane should include a clear call-to-action button linking to its dedicated webpage. The overall experience should feel smooth, intuitive, and premium. # Animations We're looking for subtle luxury-inspired animations such as: * Smooth panel expansion * Image transitions * Fade and slide content * Hover effects * Micro-interactions * Soft movement (nothing overly flashy) Animation should enhance the experience without distracting from the content. # Design Style The finished widget should reflect the LLANE & Co brand: * Clean * Modern * Editorial * Luxury * Minimal * Sophisticated We value thoughtful typography, generous white space, and polished user interactions. # Technical Requirements The widget should be: * Fully responsive across desktop, tablet, and mobile * Built specifically for WordPress * Compatible with Elementor * Easy to update with new content * Fast-loading and optimized for performance * Built using clean, maintainable code * Cross-browser compatible # Deliverables The completed project should include: * Fully functional interactive "Choose Your Lane" widget * Responsive layouts for all screen sizes * Smooth animations and transitions * Integration into our existing WordPress website * Basic documentation explaining how content can be updated if needed # Required Skills * WordPress Development * HTML5 * CSS3 * JavaScript * Responsive Web Design * UI/UX Development * Interactive Web Components **Bonus Skills** * GSAP animations * Three.js (if appropriate) * Elementor development * Experience creating premium interactive landing pages * Luxury brand or real estate website experience We're looking for someone who enjoys creating exceptional digital experiences and can transform a static design into an elegant, interactive feature that reflects the premium quality of the LLANE & Co brand.

We are seeking a motivated and skilled Front-End Developer to join our apparel technology team. In this exciting role, you will play a key role in building and enhancing the next generation of operational tools that will be utilized across various departments within our organization. Your primary focus will be on creating intuitive web applications and interactive dashboards that deliver real-time insights into crucial aspects of our operations, including production performance, inventory movement, sales trends, and overall operational efficiency. As a Front-End Developer, you will collaborate closely with a diverse group of professionals, including data analysts, operations managers, product stakeholders, and back-end engineers. Your collaborative efforts will be essential in transforming complex business data into clear, concise, and actionable user experiences. You will be responsible for designing and implementing user interfaces that not only convey critical information effectively but also enhance user engagement and accessibility. This position is particularly well-suited for developers who are passionate about creating data-rich applications and who excel at building user-friendly interfaces. You will be challenged to solve complex problems related to information presentation and workflow optimization, all while employing best practices in front-end development. Additionally, you will have the opportunity to stay updated on emerging technologies and trends, allowing you to improve and innovate the applications you develop. Your contributions will have a significant impact on the organization, empowering teams to make informed decisions, improving workflow visibility, and ultimately increasing productivity in multiple areas of the business. This is a unique opportunity for a talented developer looking to make a meaningful difference in an innovative and fast-paced environment. The required skills and requirements for this position are listed below: - Strong proficiency in React, JavaScript, TypeScript, HTML5, and CSS3. - Experience developing data-driven web applications or dashboard interfaces. - Understanding of frontend architecture and reusable component design. - Experience consuming APIs and handling dynamic data within applications. - Familiarity with state management solutions such as Redux, Zustand, or similar tools. - Strong debugging and troubleshooting skills. - Experience working with Git and collaborative development environments. - Ability to communicate effectively with both technical and non-technical stakeholders. - Strong attention to detail and commitment to user experience quality.

**Job Description:** We're looking for a frontend developer to recreate the design of a single-page website using **React** and **JavaScript**. The UI/UX design has already been completed—you'll simply be translating the existing design into clean, responsive, and maintainable code. ### Responsibilities * Convert an existing one-page website design into a React application. * Ensure the page is responsive across desktop and mobile devices. * Write clean, well-organized, and reusable React/JavaScript code. * Match the provided design as closely as possible. ### Requirements * Experience with React and modern JavaScript (ES6+). * Strong HTML and CSS skills. * Ability to accurately recreate designs from mockups. * Attention to detail and responsive design best practices. ### Future Opportunities If we're happy with the work, there may be opportunities for additional frontend development projects in the future. These would be separate, paid engagements involving new components and features.

What this is: I'm the founder of a working AI SaaS platform (FastAPI/uvicorn backend, React/Vite frontend, deployed on AWS). The product pipeline is built and live! I need an experienced engineer to build the authentication, payments, and usage-entitlement layer that gates the product behind login and paid usage. You'll work against a runnable stub repository (real routes + data shapes, proprietary internals removed) - so you can build and test the full layer without ever touching the core IP, and afterwards - I will merge your work into the production app! Scope: • Auth (Clerk): signup/login, session lifecycle, backend session/JWT verification, inject a validated `user_id` into protected endpoints. • Payments (Stripe): Checkout for purchasing usage credits, plus a webhook that credits the user's ledger on successful payment. The webhook MUST be signature-verified, idempotent (Stripe retries-credit exactly once), and reconcilable (handle webhook-failed-but-payment-succeeded). • Entitlement ledger (the core): a credit balance per user with atomic check-and-decrement (two concurrent requests must never double-spend) on PostgreSQL. A `check_entitlement(user_id, ...)`gate that expensive endpoints call before doing paid work. • Server-side route gating: enforce entitlement on every paid endpoint (not just hidden in the UI); clean 401/402/403 responses. • Frontend integration (React): login/signup UI, buy-credits/checkout flow, balance display,graceful "out of credits" states, wired to the above. • Tests for the money-critical paths (webhook idempotency, atomic decrement, gating-bypass attempts). Stack you'll work with: Python 3.11, FastAPI, Pydantic, uvicorn (Linux). React + Vite, Tailwind. PostgreSQL. Clerk. Stripe. Who I'm looking for: Someone who has shipped this exact kind of system to production before. In your proposal, briefly tell me: 1. How you ensure Stripe webhook idempotency and handle reconciliation when a webhook fails but payment succeeded. 2. How you'd implement the atomic credit check-and-decrement so concurrent requests couldn't double-spend. 3. A relevant production system you've built (Stripe + auth + usage metering ideally). *I'd much rather a short, specific proposal - than a long generic one!* Working with me: I'm an engaged founder who genuinely enjoys building, and I want this to be a good experience for both of us! I'm responsive, communicate clearly, and I respect your expertise - because you're the specialist here,and I'm hiring you because you know this much better than I do! I'm not a micromanager and I'm not nitpicky - I just want the end results to be solid! I review in milestones, asking questions because I like understanding the work (not because I'm second-guessing you), and I make decisions quickly so you're never stuck waiting on me! The scope is already well-defined (detailed spec + a runnable stub repo on engagement), so you're not pricing around a vague, shifting target - it's a clean, bounded build. I care about getting the money-handling pieces right, and I'm betting you do too - if that resonates, I think we'll work well together! IP / engagement: A mutual NDA + IP-assignment (work-for-hire) before repo access. You build against stubs; you won't receive the proprietary pipeline. Work is milestone-based, fixed-bid preferred. To apply: Answer the three questions above + share 1-2 relevant examples, and ballpark your timeline and milestone structure (suggested: auth → payments+webhook → ledger+gating → frontend → tests/docs)!

We are seeking a skilled frontend software developer to enhance our web application. The ideal candidate will have experience in modern web technologies and a strong understanding of user interface design. Responsibilities include developing responsive and interactive web pages, collaborating with the backend team, and ensuring cross-browser compatibility. Familiarity with React and Angular is a plus.

We have a fully built and working React app — a patient engagement platform for medical spas called Present. It's currently running on CodeSandbox using localStorage. We need a developer to migrate it to Supabase and deploy it to Vercel. This is not a build-from-scratch project. The app is complete — patient portal, provider portal, authentication, photo upload, booking integration, all working. We need the data layer migrated from localStorage to a real production database. Scope of work (detailed brief attached): Set up Supabase project — create database tables, enable Row Level Security, configure Auth, set up photo storage Swap the storage layer — replace two functions (dbGet/dbSet) that currently read/write localStorage with Supabase equivalents. Full key-to-table mapping provided. Migrate authentication — move from custom localStorage auth to Supabase Auth (sign up, sign in, forgot password) Deploy to Vercel with custom domain mypresentapp.com End-to-end testing and handoff Timeline: We need this completed within 10 days of project start. Please only apply if you can commit to this timeline. Tech stack: React 18, plain JavaScript (no TypeScript), Supabase, Vercel, single ~2,400-line JSX file. What we provide on day one: Complete working app source code Detailed migration guide with exact data mappings Database schema documentation Live reference app to test against Test login credentials for all user roles Required: Strong Supabase experience — specifically Auth and Row Level Security Experience deploying React apps to Vercel Available to start within 24–48 hours Clear English communication — client is non-technical To apply, please include: Your experience with Supabase Auth and RLS specifically A link to a React + Supabase project you've built Confirmation that you can complete this within 10 days Your availability to start Applications without specific Supabase experience will not be considered.