Dmitry Gvozdev

ONLYOFFICE Spreadsheet Editor (SaaS and Desktop, sdkjs core, millions of users). Owned complex features from research to release: Goal Seek, Solver with a Simplex based optimization engine, and Series. Shipped 6 features, 3 built from scratch. Cut load time for 1 MB files with 10,000+ elements from 30s to 5s. Fixed 80+ deep rooted bugs via reverse engineering. Wrote unit and integration tests and built a Node.js CLI that generated QUnit tests, covering 150+ formulas in a month.

JavaScript developer on a low-code platform. Grew from Junior to Middle while shipping production features. Built a JSON data mapping layer with a configurable UI, improving import accuracy. Set up a code review process with the tech lead, spreading reviews across the team and removing the bottleneck. Mentored a junior, reviewed interns' code, advised clients, and ran onboarding. Wrote SQL for OrientDB to clean data: duplicates, empty records, indexes. Modeled entities and business logic in UML.