Yersultan Sansyzbay

Frontend Developer

Globerce Capital LLC

Developing digital products for Sky Bank

Moved eight banking apps into a shared Turborepo and reduced initial load times; also built an auto-loan platform and shared design system.

• Migrated 8 frontend applications into a Turborepo monorepo, centralizing shared libraries and UI components and cutting initial page load time from 2.5-5s to 0.5-1.5s. • Designed and implemented a modular frontend architecture across multiple banking products. • Built and maintained a shared design system based on shadcn/ui, standardizing UI development across all 8 applications. • Optimized API interactions with RTK Query, eliminating redundant network calls through caching and deduplication, and standardized validation using Zod.

Frontend Developer

Shinhan Finance LLC

Optimized a Next.js application and built an employee document self-service portal using React and Redux Toolkit.

• Optimized SSR and client-side hydration in a Next.js application, reducing initial page load time and improving the user experience. • Developed an employee self-service portal for managing corporate documentation with search, filtering, change history, and version control using React and Redux Toolkit, simplifying document handling for the entire team. • Structured the frontend codebase using Feature-Sliced Design (FSD), improving code organization, scalability, and long-term maintainability.

Frontend Developer

IDIA Market LLC

Contributed to a sales platform associated with a 2.5x revenue increase in six months and improved organic traffic by 40%.

• Participated in building a trading equipment sales platform with React.js and Next.js, contributing to a 2.5x revenue increase in 6 months. • Migrated legacy vanilla JavaScript code to React, improving codebase maintainability and simplifying project scaling. • Optimized SEO and the technical foundation of the websites, increasing organic traffic by 40%. • Refactored the component architecture and extracted reusable logic into custom hooks, reducing code duplication.

Fullstack Developer

Meloman LLC

Worked on the Meloman and Marwin e-commerce platforms and PRIME loyalty program; migrated backend work from Laravel to Node.js.

• Migrated the backend from Laravel to Node.js, speeding up performance and simplifying development. • Developed and maintained the frontend and backend for the e-commerce platforms "Meloman" and "Marwin" — serving a catalog of 200,000+ products and the PRIME loyalty program used by hundreds of thousands of active customers — using Laravel. • Implemented real-time features to enhance user experience.

Professional Training Course, Algorithms and Data Structures

nFactorial School

B.Eng., Engineering

International Engineering and Technology University

Advanced Level Practical JavaScript

Udemy