We're a pre-launch sports event app (Flutter mobile app + Django REST backend) preparing for App Store and Google Play submission. We need to migrate our subscription billing from Stripe to native in-app purchases (Apple StoreKit + Google Play Billing) before we can ship. The work is well-scoped: monthly + annual subscriptions, 7-day free trial, one subscription tier. No legacy users to migrate (no current Stripe subscribers). We have a written strategy document covering subscription lifecycle, edge cases (grace periods, refunds, restores), and store-side configuration — shared with shortlisted candidates.

We're building an internal operations platform to automate utility account management for a large real estate portfolio. Today, much of this work is manual. Information about utility accounts exists across multiple systems, and employees spend significant time identifying missing bills, reconciling account data, researching exceptions, and coordinating follow-up work. We're building a system that automates these processes by synchronizing data between our operational system and accounting system, applying business rules to identify exceptions, and presenting actionable work queues and dashboards for our operations team. Examples include: Utility accounts that exist in one system but not another Missing or delayed utility bills Accounts requiring setup or closure based on occupancy changes Autopay and e-bill tracking Operational exceptions that require human review Dashboards, work queues, assignments, notes, and status tracking Our internal product manager owns the business requirements and workflows. Your role is to work closely with them to design and implement the technical solution, not to perform business process discovery. What You'll Do Design and use AI to build the application's backend and frontend. Design a clean, maintainable application architecture. Use AI to build dashboards and workflows that allow operations teams to efficiently manage exceptions. Translate product requirements into production-ready software. Leverage AI development tools (Codex, Claude Code, Cursor, or similar) as a core part of your workflow to accelerate development. Review, validate, and refine AI-generated code to ensure quality and maintainability. What We're Looking For We're looking for an experienced software engineer with strong software engineering fundamentals who embraces AI-assisted development. You should understand how modern software applications are architected, designed, built, and deployed, and be comfortable making sound technical decisions while moving quickly. Experience in many of the following areas is preferred: Full-stack application development Application architecture and system design APIs and system integrations SQL databases and data modeling Authentication and security Cloud-hosted applications Testing and debugging Source control and collaborative development We care much more about engineering judgment, speed of execution, and the ability to effectively leverage AI than expertise in any particular language or framework. Nice to Have Experience building internal business applications or operations platforms Experience working with accounting, ERP, or workflow systems Experience building dashboards and operational tooling To Apply Please include: A brief summary of your experience building business applications. The AI development tools you use regularly (Codex, Claude Code, Cursor, Windsurf, etc.) and how they fit into your workflow. Examples of projects where AI significantly accelerated your development process. Your availability over the next 2–3 months and your expected hourly rate.

We're looking for a senior full-stack engineer to take on hands-on work across our web platform, architecting features, building APIs, and delivering polished, performant UI. Looking for someone that can do full stack but is heavy UI developmenet leaning. You'll be doing: Building full-stack features end-to-end (dashboards, booking, payments, admin tools, etc.) Modernizing existing code and reducing technical debt Node.js services, REST APIs. Performance optimization across front-end and backend CI/CD, automated testing, container-based deploys You should have: 8+ years building production web apps Strong TypeScript across a modern framework (React) Solid Node.js / Express backend experience AWS or GCP, Docker, and CI/CD experience Comfort with PostgreSQL Automated testing (Jest, Vitest, or similar) Bonus: AdonisJS, Golang

Informativ LLC is the leading provider of fraud prevention, proactive compliance, credit reports, payment calculations, and customer insights to the automotive and general consumer finance industries across the United States. Informativ's software optimizes the consumer finance qualification process, ensures compliance, and enhances profitability through automation and risk mitigation. Informativ is proud to be recognized on the 2025 and 2024 Inc. 5000 list of America's fastest-growing private companies and as a 2024 and 2025 Great Place To Work certified employer. Please visit www.informativ.com for additional information. About the Role We are seeking a Senior PHP Engineer to design, develop, and maintain high-performance web applications and APIs. In this role, you will work closely with product managers, designers, and other engineers to build scalable, secure, and maintainable solutions. You will also play a key role in technical decision making, mentoring junior developers, and improving engineering best practices. Key Responsibilities: • Design, develop, and maintain backend systems using PHP and modern frameworks (Laravel or similar) • Build and maintain RESTful APIs and integrations with third-party services • Optimize application performance, scalability, and security • Write clean, well-documented, and testable code following best practices • Collaborate with frontend, DevOps, and QA teams to deliver end-to-end solutions • Participate in code reviews, architecture discussions, and technical planning • Troubleshoot, debug, and resolve complex production issues • Mentor junior and mid-level engineers and contribute to team growth • Stay up to date with emerging PHP technologies and industry trends Qualifications: • 10+ years of professional software development experience, with strong focus on PHP • Extensive experience with Laravel • Strong understanding of OOP, design patterns, and SOLID principles • Experience with MySQL/PostgreSQL and database design • Proficiency in building and consuming RESTful APIs • Familiarity with Github and CI/CD workflows • Experience with unit and integration testing • Solid understanding of web fundamentals (HTTP, security, caching, sessions) Preferred Qualifications: • Experience with cloud platforms (AWS or Azure) • Frontend exposure (JavaScript, React, or similar) • Experience with message queues (RabbitMQ, Kafka) or caching systems (Redis, Memcached) • Prior experience working in Agile/Scrum environments • Technical mentoring experience Why Join Informativ? We’re a fast-growing technology company where your work will have real impact. You'll be joining a collaborative, forward-thinking environment that values innovation, data-driven decisions, and people-first culture. Informativ is proud to be an equal opportunity employer committed to building a "best in class" work environment. We offer a rich benefit package including paid time off, health insurance, and 401(k).

Senior Software Engineer (AI-Focused, Contract – US) Position Summary W Energy is seeking a Senior Software Engineer (Contract) to help drive the integration of AI capabilities into our core platform. This role is focused on building AI-powered product features, not just experimenting with models—embedding intelligence directly into workflows across our upstream and midstream solutions. You’ll design and implement AI-driven functionality that improves automation and user experience. This includes leveraging LLMs, machine learning models, and modern AI tooling within a production SaaS environment. This is a hands-on role for someone who can move quickly, make pragmatic decisions, and bring AI concepts into real, scalable product features. Responsibilities • Design and implement AI-powered features within the platform (e.g., automation, recommendations, copilots) • Integrate LLMs and/or ML models into existing services and workflows • Evaluate, select, and optimize AI tools, APIs, and frameworks for production use • Collaborate with Product to translate business problems into AI-driven solutions • Build and maintain scalable backend services to support AI functionality • Profile, test, and optimize performance of AI-integrated systems • Ensure reliability, security, and cost-efficiency of AI components in production • Contribute to architecture decisions around AI integration and system design • Partner with engineering teams to embed AI into existing applications without degrading stability Requirements • 5+ years of experience as a software engineer in a SaaS or cloud-based environment • Strong backend engineering experience (RoR and/or Golang preferred) • Experience integrating APIs and working within distributed systems • Hands-on experience with AI/ML tools (e.g., OpenAI, Anthropic, Hugging Face, or similar) • Experience building or integrating AI-powered features into applications (not just experimentation) • Strong understanding of data flow, system design, and performance optimization • Experience with relational databases (SQL Server or similar) • Familiarity with microservices architecture, Kubernetes, and CI/CD pipelines • Experience deploying applications in Azure or similar cloud environments • Strong problem-solving skills with ability to work in ambiguous, fast-moving environments • Builder mindset—someone who can take an idea and turn it into a working feature quickly • Pragmatic approach to AI (focus on value, not hype) • Ability to work independently in a contract environment while collaborating closely with internal teams • Strong communication skills and ability to explain AI concepts to non-technical stakeholders Preferred • Experience with prompt engineering, embeddings, or retrieval-augmented generation (RAG) • Exposure to model evaluation, fine-tuning, or AI performance monitoring • Experience with event-driven architectures or real-time data processing • Background in energy, fintech, or other complex data-driven industries

Here is what we have so far , a zapier website form that once submitted for a ride request triggers my sms approved twilio number to send me a text with the requested ride info ( lighting fast ) what wouldbe better is Twilio Expert to Build Dispatch Broadcast & Lockout System via Functions & Studio Project Description: We run a local Free community micro courtesy shuttle business utilizing a fleet of 6 gas-powered passenger vans. We need a backend developer to build a text-message-based dispatching system using Twilio Studio, Twilio Functions, and Twilio Sync for data tracking. Core Workflow Required: Web Request Ingestion: Webhook takes ride data (Name, Pickup, Dropoff, Resident Status, Pax count). Active Schedule Check: System checks an internal list of active, on-duty drivers (needs an easy way for me to update weekly schedules or toggles). Simultaneous SMS Broadcast: Send a ride text to only the active drivers on-duty right now. First Responder Wins (Lockout Logic): When a driver replies with a number (e.g., "15"), a Twilio Function checks Twilio Sync. If the ride is still unclaimed, lock it to that driver, store their name and their inputted ETA, and mark the ride as "Claimed". Late drivers must get an automated "Already claimed" text back. Customer Interactive Flow: Trigger a Twilio Studio flow to text the customer: "Your ride is confirmed! [Driver Name] will arrive in [ETA] minutes. Reply CANCEL within 3 minutes if you don't want to wait." Handle customer cancellation loops cleanly. Archival: Push all completed or canceled ride data to a permanent history log. Requirements: Deep experience with Twilio Node.js runtime environments. Proven experience managing race conditions via Twilio Sync Maps/Documents. Ability to build clean, well-commented code so non-technical owners can easily swap out driver lists/phone numbers. Step 2: Prepare Your System Specs (Before the First Call) To keep this fast and budget-friendly, hand developer clean blueprint of your data structure on day one. Have an Excel or Google Sheet ready that maps out exactly what you want tracked: Driver Name Driver Phone Shift Day Start Hour End Hour Status (On/Off Duty) Driver 1 +1727xxxxxxxx Monday 08:00 16:00 Active Driver 2 +1727xxxxxxxx Monday 16:00 23:00 Off-Duty “Can we use Twilio Sync to manage this schedule list, or would it be easier to have the Twilio Function pull this table dynamically from a Google Sheet using the Google Sheets API?” Step 3: Execution and Safeguards the milestone payments based on clear deliverables: Milestone 1 (Setup & Simulation): The developer creates the Twilio Sync environment and proves that if they send two simulate driver texts at the exact same second, one gets the ride and the other gets locked out. Milestone 2 (Studio Integration): The customer text sends successfully with the winning driver's name and ETA, and replying "CANCEL" triggers the cancellation text back to the driver. Milestone 3 (Live Beta Test): I stand on the beach with 2 or 3 of my drivers on a Tuesday afternoon. i hit submit on your webpage, watch the phones drop the texts, claim the ride, and verify the customer workflow. let me know what I missed ?

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.

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 a fast-growing telecom / AI-First CPaaS serving sms and voice API's. We are building the first AI-first communications platform (SMS, Voice, RCS, AI agents) designed for speed, simplicity, and real-world business outcomes. We are not looking for a “task completer.” We are looking for a true senior engineer who: thinks in systems moves fast makes decisions independently writes clean, scalable code uses AI tools (Claude, etc.) as a force multiplier ⚠️ Read This First Most applicants will not be a fit. If you need: detailed tickets hand-holding constant direction This is NOT the role for you. If you are the type of engineer who: sees a problem and solves it end-to-end improves architecture without being asked ships quickly without sacrificing quality You will thrive here. What You’ll Do Build and ship full-stack features across our platform (messaging, voice, AI workflows) Make architectural decisions (not just implement) Improve system performance, reliability, and scalability Work directly with founders (no PM layers) Move from idea → production very quickly What We Expect (Non-Negotiable) 5+ years real full-stack experience (not just titles) Strong backend experience (Node.js / APIs / infra) Strong frontend experience (React or similar) Experience building production systems at scale Ability to work autonomously with minimal direction High ownership mentality Bonus (but highly valuable) Experience with telecom / CPaaS / messaging Experience with AI integrations (LLMs, agents, workflows) Experience optimizing performance at scale Startup experience (especially early-stage or fast growth) How We Work Small, high-output team Very fast iteration cycles No unnecessary meetings High trust, high expectations We use AI tools heavily (Claude, etc.) — you should too What We Care About Most Not your resume. We care about: How you think How you build How fast you execute The quality of your code To Apply Please include: Links to projects you’ve built (real production work) A short explanation of: a system you designed end-to-end a difficult technical decision you made independently Your GitHub Optional (but strong signal): Share how you use AI (Claude, etc.) in your workflow Compensation Competitive (based on experience) Long-term opportunity with a fast-growing, profitable company If you are truly senior, this will feel obvious. If not, this role will be very uncomfortable.

We are a fast-growing telecom / AI-First CPaaS serving sms and voice API's. We are building the first AI-first communications platform (SMS, Voice, RCS, AI agents) designed for speed, simplicity, and real-world business outcomes. We are not looking for a “task completer.” We are looking for a true senior engineer who: thinks in systems moves fast makes decisions independently writes clean, scalable code uses AI tools (Claude, etc.) as a force multiplier ⚠️ Read This First *DO NOT APPLY IF YOU ARE PRETENDING TO BE IN A DIFFERENT COUNTRY. PROOF OF RESIDENCY IS REQUIRED. Most applicants will not be a fit. If you need: detailed tickets hand-holding constant direction This is NOT the role for you. If you are the type of engineer who: sees a problem and solves it end-to-end improves architecture without being asked ships quickly without sacrificing quality You will thrive here. What You’ll Do Build and ship full-stack features across our platform (messaging, voice, AI workflows) Make architectural decisions (not just implement) Improve system performance, reliability, and scalability Work directly with founders (no PM layers) Move from idea → production very quickly What We Expect (Non-Negotiable) 5+ years real full-stack experience (not just titles) Strong backend experience (Node.js / APIs / infra) Strong frontend experience (React or similar) Experience building production systems at scale Ability to work autonomously with minimal direction High ownership mentality Bonus (but highly valuable) Experience with telecom / CPaaS / messaging Experience with AI integrations (LLMs, agents, workflows) Experience optimizing performance at scale Startup experience (especially early-stage or fast growth) How We Work Small, high-output team Very fast iteration cycles No unnecessary meetings High trust, high expectations We use AI tools heavily (Claude, etc.) — you should too What We Care About Most Not your resume. We care about: How you think How you build How fast you execute The quality of your code To Apply Please include: Links to projects you’ve built (real production work) A short explanation of: a system you designed end-to-end a difficult technical decision you made independently Your GitHub Optional (but strong signal): Share how you use AI (Claude, etc.) in your workflow Compensation Competitive (based on experience) Long-term opportunity with a fast-growing, profitable company If you are truly senior, this will feel obvious. If not, this role will be very uncomfortable. **THIS IS A FT, HOURLY ROLE. PROVIDE YOUR REQUESTED HOURLY RATE IN PROPOSAL**