Fullstack Applied AI Engineer (Lumo)

Das ist der Job

What You Will Do Build and maintain AI tool‑calling frameworks that enable secure integrations with external services.

Darum lohnt es sich

Build responsive web interfaces and admin dashboards using modern JavaScript frameworks. Front‑end development skills with modern JavaScript frameworks (React).

Technical Environment Backend: Rust (primary), PHP (integration) Frontend: React Infrastructure: Ansible, Docker Security: Zero‑access encryption, PGP/AES protocols Monitoring: Prometheus, Grafana, distributed tracing Why Join Lumo You’ll be joining a mission‑driven team at Proton, trusted by over 100 million people worldwide and owned by the nonprofit Proton Foundation.

Flexible Working: Define your own working hours as long as you meet team meetings. Employee Benefits: Comprehensive health insurance plans, competitive retirement savings options, generous vacation and leave policies, and wellness programs.

Role Summary 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, encrypted services, and ensuring 99.9% uptime for millions of users.

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.

Fullstack Infrastructure Design high‑performance backend services in Rust for AI processing and PHP for web integration. Improve our micro‑service 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. Site Reliability & Operations 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. Core Technical Requirements 5+ years full‑stack development experience with production AI/ML systems. Expert proficiency in Rust for high‑performance backend services.

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. AI & Privacy Expertise 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.

Infrastructure & Operations Knowledge of monitoring tools (Prometheus, Grafana) and incident response. Experience with CI/CD pipelines and automated deployment systems. Professional Qualities Passion for privacy rights and user‑centric AI technology. Strong problem‑solving skills with attention to security and reliability.

Self‑motivated with the ability to own complex technical challenges end‑to‑end. Excellent communication skills for cross‑functional collaboration. Preferred Qualifications Advanced degree in Computer Science, AI/ML, or related technical field. Experience with privacy‑focused or security‑critical applications.

Contributions to open‑source AI, privacy, or infrastructure projects. This role offers the opportunity to shape the future of AI by building full‑stack infrastructure that proves privacy, performance, and reliability aren’t mutually exclusive.

What We Offer Office First: Collaboration is easier and more effective in person; we have offices in Geneva, Zurich, Prague, Barcelona, Paris, London, Vilnius, Skopje, and Taipei. You can also work from home up to 30% of the time for flexibility. Technology: All devices and software you need are provided.

Food: Lunch and snacks are provided in the offices. Transport: We support employees with transport costs through public transport subsidies, bike allowances, or parking spaces. Stock Options: As a Proton employee, you receive stock options upon joining.

Learning and Development: Continuous learning opportunities, training programs, conferences, and events. Work That Matters: Proton is community‑first, funded by user subscriptions, and we put users and community first in everything we do.

Our Commitment to Diversity and Inclusion At Proton, we believe diversity drives innovation and strengthens our mission to provide privacy as a default for all.

We are committed to fostering an inclusive environment where all individuals, regardless of race, ethnicity, gender, age, sexual orientation, physical ability, or socio‑economic background, feel valued and empowered.

We strive to create equal opportunities, promote open dialogue, and support continuous learning to ensure every voice is heard and respected. #J-18808-Ljbffr