Sergio Jimenez Jimenez

Senior Software Engineer, AI Enablement

• Own the AI enablement platform consumed across Pdftools product lines: ONNX Runtime model serving, FastAPI inference services, and NLP pipelines on Hugging Face Transformers and spaCy.
• Take models from research to production end-to-end (PyTorch / TensorFlow training, ONNX export, containerized Kubernetes inference) with CI/CD, observability, and regression evaluation built into the release pipeline.
• Partner with product and research engineers to translate model research into reliable services consumed by multiple product teams.

Senior Software Engineer

• Core engineer (team of 4 within a 20+ engineer Swiss organization) on Smart Redact, the AI-based PII removal product for regulated industries (healthcare, finance, insurance, government, legal). Hybrid Named Entity Recognition plus deterministic rules across seven languages.
• Also contributed to OCR Service (180+ languages). Both products run on AWS on a horizontally scalable manager / worker architecture I helped design.
• Own infrastructure as code (Terraform), CI/CD (Azure DevOps and GitHub Actions), observability, and on-call practices across product lines.
• Drove the team's SDLC standards (review norms, testing strategy, release automation, architecture decision records) and mentor engineers across teams.

Lead Engineer, Flight Operations Optimization (OPSD)

• Architected the Grand Solver: a real-time cost-evaluation system used by operations crews across multiple airlines in the Lufthansa Group to make live operational decisions. Cloud-native on GCP, delivered in partnership with Google Cloud.
• Promoted to lead on the Lufthansa Group-wide OPSD initiative. Built simulation and automation components for cross-airline cost comparison, contributed to the long-term roadmap, and ran cross-airline refinement sessions.
• Recognized internally as an outstanding high achiever for technical depth, stakeholder communication with non-engineering domain experts, and collaborative mindset.

Liftory

• Founder and sole engineer. Shipped end-to-end: an Ionic and Angular mobile app on the App Store and Google Play, native watchOS (Swift) and Wear OS (Kotlin and Jetpack Compose) companions with bidirectional phone-to-watch sync, a Next.js marketing site at liftory.ch, and a .NET 10 backend on PostgreSQL.
• Built an agentic AI chat worker (skill-driven, multi-turn) that designs personalized training plans. RAG over a curated training and nutrition corpus using a local ONNX bge-m3 embedding model and hybrid BM25 plus cosine retrieval, orchestrated via OpenAI's gpt-5-mini with constrained decoding for typed tool calls. Chose RAG over fine-tuning: the corpus updates frequently and is too small for fine-tuning to add value.
• Workers are stateless and horizontally scalable behind RabbitMQ, mirroring the manager / worker pattern I work on at Pdftools. Full OpenTelemetry observability (Grafana, Loki, Tempo, Prometheus) and a private Gitea content pipeline publishing versioned brand-asset packages consumed by the web and mobile builds.