Experienced Flutter Developer

Role Overview

We're hiring a Flutter developer with strong backend instincts to join our team building WinSync, a pre-launch fintech app for secure, skill-based contests between friends. Your primary role will be to help implement and test anti-fraud systems, simulate contest abuse scenarios, and improve logging, edge-case handling, and QA automation across both client and backend layers.

This is a critical role — our current backend dev is carrying most of the stack and needs support on fraud prevention, contest state testing, and improving observability. Most of the UI is already done, so you’ll focus more on making the app reliable, secure, and testable before launch.

Responsibilities

• Design and test fraud protection logic (e.g., velocity limits, multi-account abuse, payout caps)
• Improve backend observability (contest logging, test coverage, state transitions)
• Build tools or flows to test edge cases across different user types
• Assist with basic UI work tied to fraud or contest states (e.g., modals, status indicators)
• Work closely with our backend lead to move faster toward launch

Requirements

• Strong Flutter experience with real apps shipped
• Comfortable working with Firebase and TypeScript APIs
• Experience working in fraud prevention, abuse logic, or data validation
• Comfortable working with backend APIs and designing/testing state logic
• Strong communicator and collaborator — you'll work alongside one other dev and a founder

Nice to Have

• Fintech, gaming, or crypto experience
• Familiarity with testing frameworks and QA automation
• Eye for UI/UX