I run a production system that spans four code-bases: • a React-based web admin dashboard that visualises data with Chart.js and talks to our REST/GraphQL layer • a Flutter mobile client using Dart, Firebase push and an in-app crypto payment flow • several Python AI automation bots that parse the same APIs and trigger business logic • a Solidity smart contract (deployed on testnet) that settles payments and emits event logs Recent releases introduced a chain reaction of issues—broken charts and time-outs on the dashboard, a payment page crash and silent push notifications in the app, AI bots getting stuck in loops after mis-parsing responses, and smart-contract event logs that no longer match on-chain state, occasionally causing transaction failures. Because the bugs interact, I need someone who can reason across the entire stack, spot where one layer is poisoning the next, and ship solid fixes quickly. You’ll have direct access to the repos (GitHub), logs (Datadog + Firebase Crashlytics), test wallets, and a staging environment. I can reproduce each bug consistently and will share steps as soon as we start. Deliverables (all code pushed via pull request and peer-reviewed): 1. Web dashboard loads under 2 s, charts render correctly, and no API time-outs. 2. Flutter payment screen operates end-to-end without crashes; push notifications reach devices on both Android & iOS. 3. AI bots exit gracefully after every run, interpreting API responses correctly. 4. Solidity contract emits accurate event logs; testnet transactions pass 100 % of the provided Hardhat test suite. 5. A short changelog outlining what was fixed, where, and why. Reach out if you have proven debugging experience with React, Flutter/Dart, Python, Solidity, and dev-ops tooling; I’m ready to give you repo access right away so we can ship the hot-fix release this week.