Project Background We are building a financial data aggregation and risk control verification system. We need to retrieve account balances, UPI IDs, and transaction history from major Indian UPI wallet accounts for multi-account fund monitoring and transaction status verification. ⸻ Core Requirements All data retrieval must be done using API-level HTTP requests: • For wallets with a Web interface: analyze and call their Web API • For App-only wallets: capture and replicate API calls via traffic analysis API-level implementations only. ⸻ Responsibilities 1. Implement mobile number + OTP login flow (manual input allowed) with session persistence (to reduce repeated logins) 2. Analyze the API call flow of the target wallet (Web or App) 3. Extract account balance, UPI ID, and transaction history as standardized JSON 4. Deliver stable, reusable API logic for future wallet integrations ⸻ Tech Requirements • Proficient in Python or Node.js, familiar with requests / httpx / axios • Experience with OTP login automation and Cookie/Token management • Skilled in using mitmproxy, Burp Suite, Fiddler, or similar tools for API traffic analysis • Experience with reverse engineering mobile/web APIs (e.g., analyzing network traffic, replicating undocumented endpoints) • Bonus: prior experience with wallet automation or Indian fintech API integrations ⸻ Budget • Fixed price per wallet, range: $100 – $200 per wallet • Bonus for developers who can provide stable login persistence or reusable session/token logic • Long-term opportunity with continuous wallet/API work in the future ⸻ Acceptance Criteria 1. Fully functional code 2. API request logic & login persistence (mobile + OTP) 3. Standardized JSON output (balance, UPI ID, transaction history) 4. Simple documentation & demo (how to run, sample output) ⸻ Apply With 1. What API traffic analysis tools have you used? (e.g., mitmproxy, Burp Suite, Charles) 2. Have you previously reverse engineered mobile or web APIs? Can you share an example (no sensitive details required)? 3. Have you implemented OTP login flows before? How did you handle session/token persistence? 4. Are you familiar with Indian UPI wallets? 5. Can you provide sample code or screenshots from similar projects? ⸻ Clarification • Each wallet is an independent module/deliverable • The scope is limited to OTP login (mobile + OTP) + data extraction (balance, UPI ID, transaction history) • No backend systems, databases, or admin dashboards are required • The deliverable is standalone executable code that outputs standardized JSON and meets the acceptance criteria $1500-2000 USD Remote project