rumofe
Lead Software Engineer · Backend & Web3
Software Engineer with a backend foundation and hands-on focus on Web3 — account abstraction (ERC-4337), smart wallets and on-chain integration. Co-founder & CTO at Wrap Investing, a fintech brokerage, where I led end-to-end product development — Go backend, cross-platform mobile app and the non-custodial wallet layer (ERC-4337 smart wallets on Base). Analytical, data-driven approach honed through competitive poker and chess. Currently seeking remote roles in fintech / Web3.
Experiece: 6 months
Yearly salary: $50,000
Hourly rate: $25
Nationality: 🇪🇸 Spain
Residency: 🇪🇸 Spain
Experience
Co-Founder & CTO
Wrap Investing (Fintech Brokerage) 2026 - 2026
Architected and developed an end-to-end multi-asset fintech brokerage platform, owning technical decisions from first commit to deployment. Built the Go backend end to end — brokerage integration (Alpaca), KYC/AML onboarding with webhook signature verification, JWT auth with token revocation, and idempotent financial transactions. Hardened the deployment from plaintext HTTP to Nginx + TLS after a security review; added per-IP rate limiting and a custom SQL migration runner. Developed the cross-platform mobile app with Flutter and Riverpod — SPKI certificate pinning (OWASP M3) and biometric unlock. Prototyped the non-custodial wallet layer hands-on with Solidity / ERC-4337 (account abstraction) on Base testnet.
Skills
javascript
node
python
solidity
golang
english
spanish