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I'm Antonio Casula, a hands-on CTO, Solution Architect, Senior Full Stack and Mobile Developer with 30+ years of experience designing, building, and shipping scalable web and mobile applications across fintech, healthcare, digital media, and travel-tech. I specialize in Node.js/TypeScript and Java backends, REST API design, and modern frontend frameworks (React, Vue.js, Angular, React Native). and Mobile apps in Flutter and Ionic I have a proven track record integrating complex third-party APIs — payment gateways, real-time voice AI, video/WebRTC, and identity verification — delivering production-grade solutions on AWS and Azure. I am a strong written and verbal communicator with Agile leadership experience, comfortable working independently or in cross-functional, distributed teams. I power AI-assisted development (Claude, GitHub Copilot, ChatGPT) to accelerate delivery while preserving code quality. I also bring security-focused practices, CI/CD, and DevOps discipline to align technology with business goals.…I'm Antonio Casula, a hands-on CTO, Solution Architect, Senior Full Stack and Mobile Developer with 30+ years of experience designing, building, and shipping scalable web and mobile applications across fintech, healthcare, digital media, and travel-tech. I specialize in Node.js/TypeScript and Java backends, REST API design, and modern frontend frameworks (React, Vue.js, Angular, React Native). and Mobile apps in Flutter and Ionic I have a proven track record integrating complex third-party APIs — payment gateways, real-time voice AI, video/WebRTC, and identity verification — delivering production-grade solutions on AWS and Azure. I am a strong written and verbal communicator with Agile leadership experience, comfortable working independently or in cross-functional, distributed teams. I power AI-assisted development (Claude, GitHub Copilot, ChatGPT) to accelerate delivery while preserving code quality. I also bring security-focused practices, CI/CD, and DevOps discipline to align technology with business goals.

Antonio Casula

PRO

Fractional CTO, Architect, Full Stack Developer, +1

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I'm Antonio Casula, a hands-on CTO, Solution Architect, Senior Full Stack and Mobile Developer with 30+ years of experience designing, building, and shipping scalable web and mobile applications across fintech, healthcare, digital media, and travel-tech. I specialize in Node.js/TypeScript and Java backends, REST API design, and modern frontend frameworks (React, Vue.js, Angular, React Native). and Mobile apps in Flutter and Ionic I have a proven track record integrating complex third-party APIs — payment gateways, real-time voice AI, video/WebRTC, and identity verification — delivering production-grade solutions on AWS and Azure. I am a strong written and verbal communicator with Agile leadership experience, comfortable working independently or in cross-functional, distributed teams. I power AI-assisted development (Claude, GitHub Copilot, ChatGPT) to accelerate delivery while preserving code quality. I also bring security-focused practices, CI/CD, and DevOps discipline to align technology with business goals.…I'm Antonio Casula, a hands-on CTO, Solution Architect, Senior Full Stack and Mobile Developer with 30+ years of experience designing, building, and shipping scalable web and mobile applications across fintech, healthcare, digital media, and travel-tech. I specialize in Node.js/TypeScript and Java backends, REST API design, and modern frontend frameworks (React, Vue.js, Angular, React Native). and Mobile apps in Flutter and Ionic I have a proven track record integrating complex third-party APIs — payment gateways, real-time voice AI, video/WebRTC, and identity verification — delivering production-grade solutions on AWS and Azure. I am a strong written and verbal communicator with Agile leadership experience, comfortable working independently or in cross-functional, distributed teams. I power AI-assisted development (Claude, GitHub Copilot, ChatGPT) to accelerate delivery while preserving code quality. I also bring security-focused practices, CI/CD, and DevOps discipline to align technology with business goals.

Available to hire

Italy

I’m Antonio Casula, a hands-on CTO, Solution Architect, Senior Full Stack and Mobile Developer with 30+ years of experience designing, building, and shipping scalable web and mobile applications across fintech, healthcare, digital media, and travel-tech. I specialize in Node.js/TypeScript and Java backends, REST API design, and modern frontend frameworks (React, Vue.js, Angular, React Native). and Mobile apps in Flutter and Ionic I have a proven track record integrating complex third-party APIs — payment gateways, real-time voice AI, video/WebRTC, and identity verification — delivering production-grade solutions on AWS and Azure.

I am a strong written and verbal communicator with Agile leadership experience, comfortable working independently or in cross-functional, distributed teams. I power AI-assisted development (Claude, GitHub Copilot, ChatGPT) to accelerate delivery while preserving code quality. I also bring security-focused practices, CI/CD, and DevOps discipline to align technology with business goals.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

Italian

Fluent

English

Fluent

French

Advanced

Work Experience

Senior Full Stack Developer / Head of Technology (External) at Tantum Corporate – E-Money Institution

August 1, 2025 - Present

Hands-on full-stack development of TantumWallet platform and TantumPay React Native mobile application; designed and implemented REST APIs and backend services in Java/Spring Boot and Node.js; integrated payment processing, identity verification and core-banking systems; built secure authentication flows (WebAuthn passkeys, SMS OTP hardening), rate limiting and anti-abuse measures; implemented encryption with AWS KMS and secrets migration to AWS Secrets Manager; integrated third-party services for IBAN/SWIFT validation and EU compliance; maintained CI/CD pipelines on AWS (EC2, EKS).

Chief Technology Officer / Lead Full Stack Developer at Tantum Corporate – Liechtenstein

January 1, 2023 - August 1, 2025

Designed and built the full e-money platform from scratch: REST APIs, backend services, web admin, and React Native mobile wallet; architected microservices and integrations with core-banking, payment rails, KYC/age verification and compliance systems; hands-on contribution across Node.js/TypeScript, Java Spring Boot, React, React Native, MongoDB, AWS; led a cross-functional team and documented architecture.

Senior Full Stack Engineer (Consultant, 50%) at Apprentice.io

January 1, 2020 - December 31, 2021

Built Microsoft Teams BOT integration with proprietary Tandem platform; stack included Angular, TypeScript, Node.js, MongoDB, MS Teams SDK, WebRTC.

Senior Full Stack Engineer (Consultant, 50%) at Roche Diagnostics AG

January 1, 2019 - December 31, 2022

Tellme: predictive-maintenance support tool; STING UI feasibility and full architecture design; developed custom ElectronJS/Node.js browser; coordinated remote team in India.

Application Manager / System Integration Architect at Cembra Money Bank AG

January 1, 2016 - December 31, 2018

Full-stack development of IPS — Embeddable Multiformat Document Viewer; delivered 25%+ productivity gains in loan and auto-leasing origination; stack included Ionic, AngularJS, HTML5, Java 8, Node.js, Groovy/Grails.

Founder / Lead Full Stack Developer at Dolidas MB (Lithuania) / Assiomatica AG (Switzerland)

January 1, 2014 - Present

Founded BabelTalkie real-time AI voice translation platform; full-stack development across React/Vue frontend, Node.js/WebSocket backend; integrated Deepgram STT, DeepL, ElevenLabs TTS; BabelTalkieOne/Duo web apps for live translation; Idiomaone Chrome Extension with OpenAI Realtime API; implemented Stripe billing and loyalty platforms (LoyalToMe).

CTO / Solution Architect at Provatis SA

January 1, 2012 - December 31, 2014

Built PROVALERTE web/mobile fleet-management platform for MobilityBox IoT devices; stack included Groovy/Grails, Java, AKKA, AngularJS, Cassandra, iOS, Android, Cordova.

Senior Java Web Consultant at Italian Ministry of Transport

January 1, 2009 - December 31, 2010

Freelance engagement (Struts, Hibernate, Oracle).

CTO / Tech Committee at Consorzio Sardegna Digitale

January 1, 2006 - December 31, 2008

HW/SW architecture for Italian Digital-TV broadcasting platform & CMS.

Freelance Project Manager at Unione Editoriale S.p.A.

January 1, 2006 - December 31, 2008

Scaled unionesarda.it from 0 to 2M page-views/month within one year.

CTO / Founder at Softfobia srl

January 1, 2000 - December 31, 2006

Web agency focused on web/mobile projects; early R&D activity.

Senior Java Architect at TISCALI S.p.A.

January 1, 1999 - December 31, 2000

Senior Java Architect; contributed to core web architecture.

Senior Web Engineer / PM at Video On Line S.p.A.

January 1, 1996 - December 31, 1999

Senior Web Engineer / Project Manager at one of Europe’s first ISPs; web platforms.

Project Manager at KRENESIEL S.p.A. / Banco di Sardegna

January 1, 1991 - December 31, 1996

Project management for banking and telecom-related projects.

Owner / CTO at Centro Sistemi srl (DIGITAL dealer) / Passamonti

January 1, 1983 - December 31, 1991

R&D and hardware/software development focused on telecommunication and online services; mobile R&D, real-time video streaming (iOS/Android), computer vision, QR/Arduino projects.