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Full Stack Engineer
Job
Sell It or No
Remote
$140,000 Salary, Full-Time
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83
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Job Description
About the Project Sell It or No is a mobile-first online auction marketplace that gives sellers unique control over bid acceptance. The platform features real-time bidding, AI-assisted listing creation, Stripe payment processing with auth holds, comprehensive shipping coordination, vehicle and real estate transaction workflows, a full admin center, and advertising integrations. The product is in active development targeting a quick launch and needs a skilled engineer to carry it across the finish line. Engagement Type Contract to start with a strong path to hire for the right candidate Post-launch support retainer expected Mostly Remote, but must be able to meet in person in or near Milwaukee, WI or Chicago, IL as part of interview and on occasion during role. What You'll Be Doing Launch preparation — finish remaining features, resolve open issues, and harden the product for go-live Testing — write and execute integration/end-to-end tests; manually verify critical user flows (bidding, checkout, payments, shipping) Security review — audit API endpoints, rate limiting, session handling, input sanitization, Stripe webhook verification, and auth flows; fix any findings Performance optimization — database query analysis, Redis cache tuning, frontend bundle sizing, pagination, and image delivery Code quality — address tech debt, enforce TypeScript strictness, clean up dead code Post-launch support — monitor production logs, triage bugs, ship hotfixes, support feature requests Must-Have Experience 3+ years of professional full-stack development (TypeScript required — both frontend and backend) Solid React — hooks, query management, complex component state Node.js / Express —