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Nikita Chekmarev
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Odesa , Ukraine

Full-Stack Developer

Full Stack Developer with hands-on experience building and scaling complex web applications. Experienced in
delivering end-to-end features, from designing frontend architecture and reusable UI components to implementing
backend APIs, data models and asynchronous processing. Passionate about writing clean, maintainable code, solving
complex technical challenges, and continuously improving application performance and user experience. Looking for
opportunities to contribute to technically challenging products while continuing to grow as an engineer.

TECHNICAL SKILLS
● Typescript
● Javascript
● Angular
● React
● Nodejs ( Express.js )
● MongoDB
● Cypress , Playwright
● MinIo
● RabbitMQ
● NestJS

PROFESSIONAL EXPERIENCE

Full stack developer at Cardstop, Inc 2024-present

● Multi-Storage Allocation System.

- Owned the technical design and implementation of a cross-platform multi-storage allocation system,
coordinating frontend and backend development while integrating the feature into marketplace listings,
auctions, and personal collection management.
- Designed the storage architecture around reusable abstractions, allowing new storage types,
placement algorithms, and allocation variants to be introduced with minimal changes to existing
application logic.
- Engineered an interactive 3D binder experience in Angular using modern CSS transforms and
animations, implementing realistic page-flipping mechanics, adaptive layouts, configurable storage
layouts, drag-and-drop allocation, and multiple viewing modes while maintaining smooth interaction
across desktop and mobile devices.
- Implemented virtualized page rendering and selective DOM rendering, ensuring only visible binder
 pages were mounted at any given time, substantially reducing DOM size, layout and
rendering overhead, and Angular change detection costs when navigating large collections.
- Enhanced user experience through smooth animations, adaptive layouts, responsive interactions,
and intuitive storage workflows while preserving rendering performance. - Designed and
implemented synchronization pipelines between MongoDB and Elasticsearch, handling asynchronous
updates, partial failures, and eventual consistency to ensure search indexes accurately reflected
transactional storage state.
- Established a reusable storage platform that became the foundation for marketplace listings,
auctions, and personal collection management, reducing feature-specific implementations and
simplifying future storage enhancements.

● Order Returns System.

- Architected a comprehensive order returns system, introducing configurable return policies that
enabled buyers to resolve issues directly with sellers or escalate disputes to platform support based on
configurable business rules.
- Owned the end-to-end return lifecycle across frontend and backend, developing APIs, database
models, and user workflows covering return requests, approvals, shipping, dispute resolution,
refunds, inventory reconciliation, and final order settlement.
- Integrated shipment tracking directly into return conversations, providing real-time delivery
updates through WebSockets and RabbitMQ-driven event processing to keep buyers, sellers, and
support agents synchronized throughout the return process.
- Engineered extensible workflow logic that accommodated multiple return scenarios, seller
decisions, support interventions, and automated status transitions while maintaining a clear audit
trail of return activity.
- Developed asynchronous event-driven workflows using RabbitMQ to coordinate return state
transitions, notifications, inventory updates, payment events, and external service integrations
while ensuring reliable processing and eventual consistency across distributed services.
- Delivered a scalable, event-driven returns platform that streamlined buyer, seller, and
support interactions while improving transparency throughout the entire return lifecycle.

● Financial & Accounting Integration.

- Led the integration between the marketplace platform and the Bigcapital accounting system,
automating financial synchronization across customer orders, returns, refunds, platform
commissions, taxes, and accounting records.
- Built communication between multiple backend services spanning Express.js (MongoDB) and
NestJS (MariaDB) applications, ensuring reliable financial data exchange between operational
and accounting domains.
- Developed backend APIs, event-driven workflows, and data transformation pipelines
responsible for converting marketplace events into accounting operations while maintaining
data integrity and minimizing manual reconciliation.
- Delivered a reliable financial integration that eliminated manual accounting operations and
ensured accurate synchronization between operational and accounting systems.
 EDUCATION

Shipping at National University “Odesa Maritime Academy” 2018-2021

ADDITIONAL COURSES AND TRAININGS

Front End Pro at Hillel IT School 2022
https://certificate.ithillel.ua/view/43813996

TypeScript at Hillel IT School 2024
https://certificate.ithillel.ua/view/18039193

Node.js at Hillel IT School 2025
https://certificate.ithillel.ua/view/35140720