Full Stack Engineer – Youth Sports SaaS MVP

This role is focused on building a mobile-first SaaS MVP designed to streamline youth sports scheduling for families with multiple children. The application will enable parents to register, create family profiles, add children and teams, manually input events, and leverage AI to extract event details from team messages or uploaded schedules. Parents will confirm or edit extracted information before it is saved to a centralized family calendar. The platform will also feature a family dashboard, an AI assistant for schedule queries, basic conflict detection, email reminders, Stripe-powered subscriptions, free-plan limitations, account deletion, analytics, and production deployment. The ideal candidate will architect and deliver a simple, reliable, and responsive web application, avoiding unnecessary complexity and focusing on core functionality. Deliverables Develop a responsive web application using Next.js, TypeScript, React, and Tailwind CSS. Integrate Supabase/PostgreSQL for data storage and authentication, ensuring robust Row Level Security and API security. Implement AI-powered event extraction using OpenAI structured outputs. Build a family dashboard, event management, and AI assistant for schedule-related queries. Set up Stripe for subscription management and Resend for email notifications. Deploy the application to Vercel and manage code via GitHub. Ensure production readiness, analytics integration, and account management features. Deliver a fixed-price milestone proposal and provide an estimated part-time timeline (8–10 weeks). Requirements Proven experience shipping SaaS MVPs as a full-stack developer. Expertise in Next.js, TypeScript, React, Tailwind CSS, Supabase/PostgreSQL, and authentication best practices. Strong understanding of AI product architecture and integrating OpenAI APIs. Experience with Stripe integration, email notification systems, and analytics. Familiarity with Vercel deployment and GitHub workflows. Ability to design secure, scalable, and maintainable application architectures. Focus on simplicity, reliability, and avoiding over-engineering. Excellent communication skills and ability to work independently. Availability for a part-time commitment over 8–10 weeks. About Twine Twine is a leading freelance marketplace connecting top freelancers, consultants, and contractors with companies needing creative and tech expertise. Trusted by Fortune 500 companies and innovative startups alike, Twine enables companies to scale their teams globally. Our Mission Twine's mission is to empower creators and businesses to thrive in an AI-driven, freelance-first world.

Architect and develop a mobile-first SaaS MVP for youth sports scheduling, including AI-powered event extraction and a family dashboard. Implement secure data storage, subscription management via Stripe, and deploy the application to Vercel.

Proven experience shipping SaaS MVPs with expertise in the Next.js, TypeScript, and Supabase ecosystem. Strong ability to integrate OpenAI APIs and manage production deployments via GitHub and Vercel.

• Next.jsPreferred
• GitHubPreferred
• PostgreSQLPreferred
• ReactPreferred
• Tailwind CSSPreferred
• TypeScriptPreferred

Identified from the job description. Confirm important requirements above.

• Next.js
• TypeScript
• React
• Tailwind CSS
• Supabase
• PostgreSQL
• OpenAI API
• Stripe
• Vercel
• GitHub
• SaaS MVP Development
• AI Product Architecture

• Software
• Technology
• Engineering
• Sports & Recreation

Minimum experience

5+ years

Posting language

English

Working hours

40 hours per week

Seniority

Mid-Senior level