Aleksei Chernov

Led frontend development for a liveops and monetization platform for games and game designers. Delivered key features including Roles & Permissions and a Git-like Save & Revert workflow using React 18, Redux RTK, Chakra UI, Webpack, and TypeScript. Improved UI quality and prevented regressions by integrating Storybook & Loki with unit/integration/e2e testing standards (Jest, Enzyme, React Testing Library). Performed system-wide architecture and technical-debt audits and prioritized a stability roadmap with staged refactoring. Optimized performance to improve SEO-critical metrics (LCP: 5.8s → 1.9s, CLS: 0.25 → 0.05), contributing to client retention. Coordinated with CTO, CEO, Backend, DevOps, and Product to align engineering delivery with product goals; led estimation and task decomposition for complex projects.

Built multiple SaaS applications from scratch for the Semrush ecosystem (Plagiarism Checker, Website Speed Test, Email Verifier). Implemented a clean Simple Modular Architecture using Atomic Design and the Intergalactic UI kit to ensure reusable, scalable UI across projects. Established frontend code standards and modern testing practices, achieving full test coverage for new products by integrating Storybook & Loki and using Jest & React Testing Library. Projects were delivered in an average of ~2.5 months each.

Architected a complex refactor of a micro-services monorepo for a real-estate virtual tours and 3D camera solution. Applied Feature-Slicing Design (FSD) and modern frontend patterns to increase stability and performance. Improved page load performance (LCP: 3.2s → 1.1s, CLS: 0.2 → 0) and increased system reliability. Implemented a quality-first approach with Storybook & Loki (visual regression), e2e/integration testing, and Jest & Enzyme unit testing (up to ~90% coverage), along with standardized architectural design patterns. Reduced post-release defects by introducing a pair code-review process and CI/CD automation (linting and auto-tests approvals) in collaboration with DevOps.