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Samuel Rojas

@samuelrojas

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I build secure Python LLM agents and full-stack apps, defending against prompt injection and data leakage.

Colombia

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What I'm looking for

I'm looking for remote, async work building LLM agents, AI security defenses, Python back ends, or full-stack applications. I value hands-on building, secure implementation, and opportunities to learn through real products.

I built agent-security-lab, a public B2B sales-agent lab that protects internal product data from prompt injection and information-disclosure attacks using Python, Supabase, and the Gemini API.

I also build mobile and back-end products, including Checho, an offline-first financial-education app with budgeting, debt-management, savings, gamification, and GitHub Actions CI. I tested it with real users and iterated on their feedback.

Through freelance development, I create Flutter online and offline apps, REST APIs, and Supabase- and Firebase-based integrations. I work remotely and asynchronously in English and Spanish, and I manually review AI-generated code.

Experience

Work history, roles, and key accomplishments

Freelance Mobile & Back-end Developer

Independent

Developed Flutter mobile apps (online/offline) and planned AI agent security auditing services including prompt-injection testing and defense implementation. Heavily used AI assistants in development while manually reviewing all generated code.

Flutter Dart REST APIs AI Security Agents Prompt Injection Testing Defense Implementation AI assisted Development

Education

Degrees, certifications, and relevant coursework

Google

Google Cloud Cybersecurity Certificate, Cybersecurity

Completed the Google Cloud Cybersecurity Certificate, covering cloud security principles, IAM, networking, compliance, risk management, and zero trust.