Олексій

Oleksii Volkov
Full-Stack Developer
Kharkiv, Ukraine
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Professional Summary
Full-Stack Developer with 10+ years of experience building production web applications, primarily frontend-
led but with full-stack delivery experience across Node.js, GraphQL, NestJS, and Express on the backend,
plus PostgreSQL, MongoDB, and Redis. Strong React and TypeScript foundation, comfortable owning
features end-to-end and collaborating closely with backend teams on API contracts and data models.
Background spans fintech, AI-powered analytics, e-commerce, and content platforms. Known for moving
fast without leaving a mess behind.

Technical Skills
• Languages: TypeScript, JavaScript (ES6+), HTML5, CSS3
• Frontend: React, Next.js, Gatsby
• Backend: Node.js, NestJS, Express, GraphQL, REST APIs, Prisma, Mongoose, Knex.js
• Databases: PostgreSQL, MySQL, MongoDB, Redis, Elasticsearch
• State & Data: Redux, Redux-Saga, Zustand, React Query, GraphQL clients
• Testing: Jest, React Testing Library, Cypress, Chai, Sinon
• Styling: Tailwind CSS, SCSS/SASS, Styled Components, Material UI, Bootstrap
• Tools & DevOps: Git (GitHub, GitLab, Bitbucket), Turborepo, pnpm, AWS S3, RabbitMQ, Docker
• CMS: Drupal, Directus, Magento
• Project Management: Jira, ClickUp, Redmine, Trello, Everhour

Professional Experience
Frontend Developer — Freelance (US Client) January 2025 – Present
Drupal-based website platform — CMS-driven architecture with AI-powered semantic search. Remote.
• Delivered frontend features for a Drupal-based website platform, working within a CMS-driven
architecture while maintaining performance, code quality, and consistent UX across dynamic, content-
driven pages.
• Designed and developed a reusable AI-powered semantic search module for Drupal, replacing
keyword-based search with intent-driven results and positioning it as a productized feature for website
templates.
• Applied AI-assisted development workflows (Claude, ChatGPT) to accelerate prototyping, debugging,
and implementation.
• Stack: React, TypeScript, Drupal, PHP, OpenSearch.
Lantern AI — Frontend Developer June 2022 – December 2024
Private equity intelligence platform — financial datasets, benchmarking tools, corporate hierarchy
visualization. Remote.
• Built high-performance charting components handling 10k–50k live data points, enabling smooth
interaction with large datasets and removing UI performance bottlenecks for analysts.
• Integrated the yFiles graph visualization library to represent multi-level corporate ownership structures,
introducing a new analytical capability for exploring fund relationships.
• Designed a unified client-side data model across multiple APIs, eliminating recurring data
inconsistencies and reducing frontend mapping errors in production.
• Delivered responsive, WCAG-compliant dashboards across a wide range of screen sizes, maintaining
usability under high data density conditions.
• Established modular architecture in a Turborepo monorepo, enabling shared components across
applications and reducing cross-package regressions.
• Stack: React, TypeScript, Next.js, Redux, Redux-Saga, Tailwind CSS, Turborepo.
OpenBook — Frontend Developer February 2020 – June 2022
Task management SaaS — hierarchical data structures, budgeting, and time tracking. Remote.
• Migrated state management from Redux to Zustand, reducing boilerplate by ~60% and simplifying state
logic across the application.
• Designed a reusable data-table component supporting sorting, filtering, pagination, and inline editing —
became the core UI building block across the product.
• Built a shared component library and custom hooks that accelerated feature development and reduced
setup time for new screens.
• Collaborated with the backend team on API contracts, identifying schema mismatches early and
preventing integration issues before QA.
• Stack: React, TypeScript, Zustand, Redux-Saga, React PDF, SCSS.
Threadstudio — Full-Stack Developer March 2018 – February 2020
Custom-print e-commerce platform for apparel and merchandise, with admin tooling for order and print-
quality management.
• Designed and built Node.js/Express backend services exposing a GraphQL API for internal admin tools
and a REST API for external customer integrations.
• Modeled new data entities in MongoDB/Mongoose and implemented CRUD operations, business logic,
and validation end-to-end.
• Maintained a distributed order-processing system using MongoDB, Redis, and RabbitMQ, ensuring
stable operation without data-loss incidents.
• Extended the React admin app with new features and connected it to GraphQL endpoints.
• Contributed to 80%+ test coverage on new code, enabling frequent and reliable production releases.
• Stack: React, Node.js, Express, Next.js, GraphQL, MongoDB/Mongoose, Elasticsearch, Redis,
RabbitMQ, Material UI.
Earlier Frontend Roles August 2016 – March 2018
• Cryptocurrency Marketplace (Front-End Developer): Built layouts in React with Redux, integrated
backend APIs, implemented project cards (sorting, viewing, navigation), marketplace section, and
newsfeed.
• Ukrainian Architecture Exhibition — ukrarchipedia.com (Front-End Developer): Built an
interactive online exhibition with Next.js, TypeScript, Directus CMS, and Styled Components, with
server-side rendering for SEO and performance.
• IdeaBank — ideabank.ua (Front-End Developer): Integrated a React frontend with a Drupal 8 CMS
for a major Ukrainian bank; implemented AMP pages, improved form functionality, and provided
ongoing maintenance.

Education
Kharkiv National University of Radio Electronics September 2005 – June 2010
Specialist Degree, Laser and Optoelectronic Technology
Ukrainian IT School — Front-End Development Certificate 2016

Languages
English: Professional working proficiency · Ukrainian: Native