Cristian Di Carlo

Full-stack Developer

Mobile Developer

I'm Cristian, known online as Okazakee, a full-stack and mobile developer from Italy. I build reliable web and mobile products, including applications involving Bitcoin, Lightning, Nostr and wallet/payment infrastructure.

Outside client work, I build open-source projects around local-first software, peer-to-peer systems, developer tooling and Linux. I enjoy architecture, debugging and implementation, especially under unusual technical constraints.

Skills & Tech Stack

Technologies I use regularly across web, mobile, backend and infrastructure work

Career History

My professional experience across web, mobile and product integration

Apr 2026 - Aug 2026 // 4 months

Blox Space

Turin, Piedmont, Italy // Hybrid

Full-stack Developer

Contributed to application and integration-layer development for digital payment products across React/TypeScript frontends and Node.js backend integrations.
Implemented product and authentication flows including localization and email OTP, while working on payment UI, transaction state, error handling and integration reliability.
Built payment UI and supporting backend integrations for Telegram Mini Apps and product prototypes using existing APIs, SDKs and provider infrastructure.
Researched and specified integrations across wallet and payment providers, including UR / Fiat24, Privy and Gnosis Pay, translating provider capabilities into implementation plans and technical decisions.
Supported product and architecture work around KYC, wallet flows and custodial/non-custodial payment models, including research and prototyping related to Bitcoin, Lightning and digital-asset payments.

TypeScriptReactNode.jsREST APIsPayment IntegrationsWallet Integrations

Apr 2025 - Apr 2026 // 1 year

Portal Technologies Inc

Brescia, Lombardy, Italy // Hybrid

React Native Engineer

Developed and maintained the React Native + Expo application layer of Portal App, integrating a shared Rust core library through UniFFI bindings and consuming its functionality from the mobile application.
Built and maintained onboarding, AppLock, cloud backup, profile and identity synchronization, and offline-first application flows across complex mobile state and lifecycle scenarios.
Integrated Nostr functionality including nsec handling, NIP-05 identity resolution and profile synchronization.
Integrated Bitcoin and Lightning functionality exposed through existing SDKs and core services, including Breez SDK, NWC, QR/NFC payment flows and payment-status synchronization.
Worked on app-side secure storage, biometrics, SQLite/Drizzle data flows, native Kotlin/Swift integrations, Jest and Maestro E2E testing, and debugging of lifecycle, state and migration issues.

React NativeExpoTypeScriptNostrSQLiteE2E Testing

Aug 2023 - Jul 2024 // 11 months

Enhancers - Tinexta Group

Turin, Piedmont, Italy // Remote

Frontend Developer

Developed IoT device management dashboard UI for Tecnoalarm using Angular, implementing designs from Figma specifications
Created new customer portal for Illumia energy company with React, enhancing user experience for account management
Implemented responsive and intuitive interfaces following design system guidelines
Collaborated with backend teams to integrate API endpoints for IoT device data
Applied performance optimization techniques to improve application responsiveness

NextJSViteJSAngularAPIs

May 2023 - Aug 2023 // 3 months

Entiende

Naples, Campania, Italy // Remote

Full-stack Developer

Designed and built a real-time notification system using Socket.io and NestJS
Created a microservice architecture connecting Express.js backend with Angular frontend
Developed real-time lead tracking functionality that displayed Facebook conversions via toast notifications
Designed and built a real-time notification system using Socket.io and NestJS
Created a microservice architecture connecting Express.js backend with Angular frontend

NestJSExpress.jsAngularSocket.ioMicroservices

Frontend Developer

Jan 2023 - May 2023 // 4 months

Naples, Campania, Italy // Remote

Created responsive landing pages for TIM ad campaigns
Implemented key features for the company's backoffice CRM solution using Angular
Main company website maintenance

ReactJSExpress.jsAngularCMS