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TA N I A
BILENKO
L: Ukraine
E: [open contact info](look above in the "contact info" section)
T: [open contact info](look above in the "contact info" section)
F U L L- S TAC K D E V E LO P E R W: www.toyless.dev

SUMMARY
Product-focused Full-Stack Developer specializing in end-to-end product development, building scalable web and mobile
applications from the ground up — from idea and system design to production release. Proficient in React.js, Next.js, React Native
and Node.js, with experience in REST API architecture and integration, scalable relational and NoSQL database design, and
enhancing backend performance via database query optimization, caching, and API efficiency improvements. Adept at
collaborating with developers, designers, and QA while also working directly with founders, product owners, and business
stakeholders to turn product ideas into scalable, user-focused solutions.
EXPERIENCE SKILLS
Full Stack Developer [ Freelance ] Remote JavaScript (ES6+)
May 2023 - Present TypeScript
Delivered production web and mobile applications using React, Next.Js, React Native, React.js
Node.Js, and TypeScript, supporting full product development from architecture to release. Next.js
Designed and implemented REST APIs, backend services, and scalable data models with React Native
PostgreSQL, enabling reliable integrations between applications, CMS platforms, and external Node.js
services. Express.js
Improved maintainability and development speed by introducing reusable component systems Nest.js
and modular project structures. HTML5
Increased application performance through query optimization, caching strategies, and more CSS3
efficient API data flows. Git
Implemented Technical SEO Improvements for dynamic web platforms including sitemap
architecture, internal linking strategies, and metadata optimization, increasing the number of
crawlable and indexed pages. ADDITIONAL
Refactored and stabilized Legacy Codebases, reducing technical debt and improving Redux Toolkit
scalability and reliability of production systems. RTK Query
Automated deployments through CI/CD Pipelines and containerized environments with TanStack Query
Docker, reducing manual release overhead. Context API
Collaborated with distributed teams and directly with product stakeholders to deliver Tailwind CSS
production-ready features aligned with business requirements. ShadCN
Styled Components
PROJECTS GraphQL
REST API
UkrPas Socket.io
[ TypeScript, Node.Js, PostgreSQL, Strapi, SEO, REST API ] Part-Time Contract Collaboration PostgreSQL
Sep 2025 - Present Redis
Problem: Dynamically generated route and listing pages had limited search visibility due to MySQL
weak internal linking, incomplete sitemap coverage, and suboptimal page structure for MongoDB
search indexing. Zustand
Action: Redesigned the SEO architecture of the platform: implemented a scalable sitemap GitFlow
structure, expanded indexable route pages, and introduced internal linking across route Firebase
listings with a dynamically rotating link block updated weekly without cron jobs or Redis Supabase
using PostgreSQL and Next.Js capabilities. Deployed and configured a self-hosted Strapi Strapi
instance for managing SEO content and dynamic page blocks. Refactored critical pages for Payload
SEO-first performance and implemented zero-render-delay SEO content sections. Docker
Result: Significantly increased the number of indexed pages and improved crawlability of CI/CD
route listings while reducing page load time by ~30–40%. The new sitemap architecture and SCSS
SEO content management enabled stable indexing of dynamically generated pages.
Avocado App Admin Dashboard CERTIFICATIONS
[ Next.Js, TypeScript, Tailwind CSS, Supabase, PostgreSQL, REST API, Server Actions, Admin Panel React, React Router & Redux
Architecture ] Contract-Based Freelance Project Toolkit
Apr 2025 - Sep 2025 Udemy
Problem: The Avocado App lacked a secure internal system for managing users, application
content, and operational data. Routine operations required direct database access, creating IT security: protection
risks for data integrity and slowing internal workflows. against digital cyber fraud
Action: Architected and developed a custom admin dashboard using Next.Js, TypeScript, Google
and Tailwind CSS. Integrated Supabase for authentication, PostgreSQL data management, JavaScript Algorithms and
and role-based access control. Implemented core administrative modules including user Data Structures
management, content moderation, analytics views, and configuration controls. Built freeCodeCamp
structured data tables with server-side filtering, pagination, and editing capabilities.
Introduced audit-safe data operations and controlled write flows through API routes and Layout and Creation of
server actions to prevent unsafe direct database manipulation. Websites from Scratch
Result: Delivered a centralized operational interface that enabled the team to manage users Udemy
and application data through a controlled environment, improving data visibility, reducing
operational friction, and eliminating the need for manual database interactions.
Avocado App LANGUAGES
[ Dart, Flutter, REST API, Go, LLM API, Gamification ] Contract-Based Freelance Project English Intermediate
Feb 2025 - Jul 2025 Ukrainian Native
Problem: Users required personalized nutrition guidance capable of adapting to goals, Russian Advanced
preferences, and behavioral patterns.
Action: Developed a Flutter mobile application integrated with a Go backend and
implemented an LLM-driven recommendation pipeline combined with rule-based logic.
Result: Delivered an AI-assisted nutrition planning system capable of generating
personalized meal recommendations and adaptive diet plans.
VsiProbihy
[ TypeScript, React.Js, Next.Js, Tailwind CSS, TanStack Query, Hey API, IcoMoon, I18n ]
Feb 2025 - Apr 2025 Social Project [ Role: Frontend Developer ]
Problem: The existing platform interface and architecture limited performance and
responsiveness across devices.
Action: Rebuilt the frontend using Next.Js, implemented modern data-fetching patterns,
and optimized API integration.
Result: Reduced page load time by ~30–40% and improved responsiveness, delivering a
faster and more accessible experience.
BeBalance
[ TypeScript, React, React Native, Redux, Redux Toolkit, PostgreSQL, Fastify, Knex, Objection ]
Aug 2024 - Oct 2024 Internship Project [ Role: React Native Developer ]
Problem: Users needed a digital tool for tracking mental and physical well-being.
Action: Implemented scalable mobile features using React Native, Redux Toolkit, and
TypeScript while integrating backend APIs.
Result: Delivered cross-platform features enabling users to track goals and monitor progress
in a structured way.
CV Builder
[ TypeScript, React, Redux, Redux Toolkit, PrimeReact, Sass, Biome ] Contract-Based Project
Nov 2024 - Jan 2025
Problem: Developers needed a simple way to create professional resumes directly within a
dashboard environment.
Action: Built a modular React-based resume builder with multiple templates, real-time
preview, and PDF export functionality.
Result: Delivered a flexible resume generation tool integrated into the Same-Code
dashboard.
EDUCATION
JavaScript Developer Ukraine
[ Binary Studio Academy ]
May 2024 - Sep 2024
Online intensive course with full-stack experience, including React Native for mobile app
development.