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leo_tillier

Leo Tillier

@leo_tillier

Full Stack and Desktop Developer

France
French, English
About me
Hi, I’m Leo, a French full-stack and desktop developer. I build responsive websites, secure backend systems, REST APIs and Windows applications using JavaScript, Node.js, Python, C#, .NET and SQL. I focus on clean architecture, maintainable code, performance and clear communication. Please contact me before ordering so I can review your requirements and recommend the right solution.... Read more

Skills

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leo_tillier
Leo Tillier
Offline • 
Average response time: 1 hour

See my services

Custom Websites
I will develop a custom full stack website with secure backend
From$80 / projectMore details
Bug Fixes
I will fix HTML CSS javascript react nodejs bugs professionally
From$20 / projectMore details

Portfolio

Work experience

Self_Employed

Self Employed

Freelance • 2 yrs 3 mos

Full Stack Developer

Oct 2025 - Present • 9 mos

I develop modern websites, desktop applications, APIs, and backend systems using HTML, CSS, JavaScript, Node.js, C#, and Python. I specialize in backend development, responsive web applications, automation tools, and database integration. My goal is to deliver clean, secure, scalable, and high-performance solutions tailored to each client's needs.

Security Researcher

Jan 2025 - Present • 1 yr 6 mos

I perform authorized security assessments, vulnerability analysis, and web application security reviews. I help identify security weaknesses and provide clear remediation recommendations following industry best practices.