Fullstack Applied AI Engineer, Proton

• 5+ years fullstack development experience with production AI/ML systems
• Expert proficiency in Rust for high-performance backend services
• Frontend development skills with modern JavaScript frameworks (React)
• Understanding of AI/ML model integration and tool calling architectures
• Experience with end-to-end encryption implementation and cryptographic protocols
• Knowledge of infrastructure automation and site reliability practices
• Experience with large language models, AI agents, and function calling systems
• Understanding of AI model serving frameworks (e.g. vLLM)
• Knowledge of privacy-preserving technologies and zero-knowledge protocols
• Experience building search systems and information retrieval pipelines
• Familiarity with vector databases and semantic search technologies
• Knowledge of monitoring tools (Prometheus, Grafana) and incident response
• Experience with CI/CD pipelines and automated deployment systems
• Passion for privacy rights and user-centric AI technology
• Strong problem-solving skills with attention to security and reliability
• Self-motivated with ability to own complex technical challenges end-to-end
• Excellent communication skills for cross-functional collaboration

Desirable

• We are seeking a Fullstack Applied AI Engineer to build and maintain the complete AI infrastructure powering Lumo's privacy-first platform
• You'll own the full stack from database to frontend, implementing AI tool calling systems, privacy-preserving search, and encrypted services while ensuring 99.9% uptime for millions of users
• This role combines AI/ML engineering, backend development, site reliability, and frontend integration using Rust, PHP, and modern web technologies to deliver scalable, encrypted AI experiences
• Build and maintain AI tool calling frameworks that enable secure integrations with external services
• Implement a privacy-preserving search infrastructure that doesn't expose user queries
• Develop AI model serving pipelines with encrypted data processing throughout
• Create intelligent query routing and result filtering systems optimized for AI consumption
• Build real-time AI conversation APIs that maintain zero-access encryption
• Design high-performance backend services in Rust for AI processing and PHP for web integration
• Build responsive web interfaces and admin dashboards using modern JavaScript frameworks
• Improve our microservice architecture with service mesh for scalable AI platform development
• Improve our automated deployment pipelines and infrastructure-as-code for reliable operations
• Develop monitoring and observability systems that preserve user privacy
• Maintain highly available AI services with automated monitoring, alerting, and incident response
• Implement chaos engineering and performance testing for encrypted AI workloads
• Build auto-scaling systems for cost-effective GPU utilization and global traffic handling
• Conduct capacity planning and optimize system performance for millions of users
• You'll be joining a mission-driven team at Proton, trusted by over 100 million people worldwide and owned by the nonprofit Proton Foundation
• This role offers the opportunity to shape the future of AI by building fullstack infrastructure that proves privacy, performance, and reliability aren't mutually exclusive
• As a Fullstack Applied AI Engineer at Lumo, you'll own the complete technical stack powering privacy-first AI experiences, ensuring millions of users can rely on Lumo for their most sensitive conversations with complete confidence in both AI capabilities and privacy protection
• Technical Environment:
• Backend: Rust (primary), PHP (integration)
• Frontend: React
• Infrastructure: Ansible, Docker
• Security: Zero-access encryption, PGP/AES protocols
• Monitoring: Prometheus, Grafana, distributed tracing