Building Linear's agent platform

• Boosted R&D efficiency by >10x for a 40+ person science and eng team, with tools conceived and built 0-to-1

• Created a web app that dramatically improved collaboration and traceability, featuring real-time collaborative docs and slides, interactive high-performance charting, LLM/RAG-based assistance, Jupyter server management, inventory tracking, search, and more (Python, Django, PostgreSQL, GraphQL, TypeScript, React, Yjs CRDTs, JupyterHub)

• Developed a scientific automation platform with real-time GUI applications, modular low-code components, and extensive hardware integrations, shortening research iteration cycles from months to days while enabling otherwise intractable experiments (FastAPI, Pandas, asyncio, React, WebSockets, VISA, gRPC)

• Overhauled measurement data collection and analysis, co-designing a high-performance partitioned database schema to handle heterogeneous time series data with live monitoring (PostgreSQL, SQLAlchemy, Grafana)

• Open-sourced and maintain a rich text editor library, github.com/sjdemartini/mui-tiptap, used in production (TypeScript, React, Tiptap/Prosemirror, CSS)

• Founded and managed the software team, defining strategy and providing mentorship

• Architected geospatial systems and a web application to monitor large-scale disasters and power Airbnb’s Disaster Response & Relief program, increasing operational efficiency 10x and enabling 3x more activations than the prior five years combined

• Developed scalable Java services to expand and improve Airbnb’s Open Homes humanitarian efforts

• Launched home booking flows for disaster evacuees on iOS and Android, self-learning both platforms in my personal time to maximize our impact, ultimately driving >50% of future bookings

• Became a founding member and Security Lead of the Anti-discrimination Product Team, driving engineering and shaping user-facing features

• Created new backend infrastructure to support data scientists’ experiment analysis in an environment with restricted access control

• Led multi-team engineering efforts to revamp Airbnb’s identity verification, introducing new guest onboarding and reservation flows to improve trust and safety