# Zachary Weiss > Software Engineer Location: New York City Metropolitan Area, United States Profile: https://flows.cv/zacharyweiss Enthusiastic Software Engineer and communicator passionate about creating innovative products. Experienced in JavaScript/TypeScript, React/Redux, Node.js/Express, and both SQL and NoSQL databases, among other technologies. Co-creator of KafOpticon. Enthusiast of New York sports teams (Giants, Knicks, Yankees). Check out my work: https://github.com/zackweiss ## Work Experience ### Software Engineer @ Alki Jan 2024 – Present • Implemented an FSRS spaced-repetition scheduler in Rust, compiled to native (server-authoritative) and WASM (client preview), maintaining a single source of truth while enabling instant client-side feedback. • Improved recommendation and due-review p95 latency ~3.3x (400ms to 120ms) by pushing priority scoring into PostgreSQL using CTEs and GIN indexing to support real-time ranking at 3,500+ problem scale. • Designed a dual-date model (fsrs_due vs display_due) to preserve algorithm state during user setting changes, preventing schedule drift and eliminating stuck review queues. • Built a Rust-to-TypeScript type-generation pipeline using ts-rs with CI enforcement, reducing API/frontend integration regressions ~80% by detecting contract mismatches pre-deploy. • Increased nightly content sync reliability from ~92% to >99% by implementing retry/backoff, partial re-syncs, and idempotent upserts for the content ingestion pipeline (LeetCode API). • Implemented timezone-correct day-boundary logic in PostgreSQL (AT TIME ZONE), ensuring streaks, heatmaps, and due-date calculations remain accurate across user locales. ### Software Engineer @ KafOpticon (Open Source) Jan 2023 – Jan 2024 • Co-founder of Kafopticon, an open source tool accelerated by OS Labs that facilitates seamless connections to local Kafka clusters with support for both native and Docker-contained environments, enhancing developer productivity and Kafka management • Utilized Dockerode to programmatically control Docker containers, orchestrating dynamic container creation, networking setup, and data streams • Incorporated Prometheus and Grafana to provide insightful health and performance metrics visualization and alerts, enabling consumers to monitor and optimize Kafka cluster operations efficiently • Engineered a cross-platform Electron application, ensuring wide accessibility across various operating systems • Implemented KafkaJS to simulate mock producer and consumer groups, facilitating robust testing and development against a self-hosted Kafka cluster, simulating real-world usage scenarios • Integrated React Router, creating a seamless single-page application (SPA) with a clean, user-friendly interface that improved navigation and interaction efficiency for Kafka cluster management • Leveraged PromQL to enable advanced data querying and manipulation, enhancing the capability of Prometheus for detailed and efficient monitoring of Kafka cluster metrics, thereby improving the tool's analytical depth and operational insight • Implemented JMX Exporter as a java agent to effectively scrape and monitor metrics from Kafka clusters, enhancing the tool's capability to provide real-time data insights and improve cluster performance management •Developed a comprehensive testing suite using Jest, Supertest, and React Testing Library to ensure codebase stability, streamline new feature additions, and significantly reduce QA time through meticulous unit and integration tests ### Academic Tutor @ Foley Prep Inc. Jan 2019 – Jan 2023 • Contributed to the redesign of the Foley Prep website, implementing a modern UI/UX design with HTML5, CSS3, and JavaScript to enhance visual appeal and user experience, and developed a fully responsive layout using CSS Flexbox and Grid to ensure optimal functionality across desktops, tablets, and mobile devices • Optimized website performance by leveraging asynchronous JavaScript, image compression techniques, and browser caching, reducing load times by 40% • Implemented SEO best practices, including meta tags, alt attributes, and structured data, resulting in a 30% increase in organic traffic ## Education ### Bachelor's degree University of Pennsylvania Jan 2015 – Jan 2019 ### Master's degree in Computer Science Georgia Institute of Technology Jan 2025 ## Contact & Social - LinkedIn: https://linkedin.com/in/zack-weiss1881 - GitHub: https://github.com/zackweiss --- Source: https://flows.cv/zacharyweiss JSON Resume: https://flows.cv/zacharyweiss/resume.json Last updated: 2026-04-01