Данило

Danylo Kholkin
Middle Full-Stack Developer / Middle Software Engineer / AI Engineer

location Lviv, Ukraine / Remote telegram [open contact info](look above in the "contact info" section)

e-mail [open contact info](look above in the "contact info" section) links LinkedIn

SUMMARY
Full-Stack Engineer with 3.5+ years of experience building complex web, and AI-powered
products across healthcare, and e-commerce domains. Deep expertise across the full JS/TS
stack (React, Next.js, Node.js, NestJS), cloud infrastructure (AWS, Firebase), and AI
integrations (ChatGPT, Gemini, Copilot). Passionate about clean architecture, security, and
turning business challenges


SKILLS
Languages: TypeScript, JavaScript , Go

Frameworks: React, Next (Frontend); Node.js, Nest, Express

Databases: SQL (PostgreSQL), NoSQL (MongoDB, Firebase Firestore, Redis)

AI Tools: Claude Code, JetBrains Junie, GitHub Copilot

DevOps: Docker

Cloud: AWS, Firebase

API: REST, GraphQL

VCS: Git, GitHub, GitLab, BitBucket

Testing: Jest, Cypress

Security: OAuth, JWT

Other: Tailwind, CSS, SCSS, HTML, Telegram API, Liqpay API, Google Analytics, Vercel, Redux,
Redux Toolkit, Zustand, GSAP, TanStack query

EXPERIENCE
Dec, 2025 — Aug, 2026 Middle Full-Stack Developer at InProject HUB
Lviv, Ukraine InProject HUB provides end-to-end services in software development
and IT infrastructure, offering R&D and ready-made solutions for a
variety of business needs.
B uilt a e-commerce functionality for a local restaurant from scratch, supporting online payment,
delivery status, coupons system.

Delivered full refactoring of a codebase removing more than 10k+ unnecessary line of code.

Optimized web app for a SEO and performance metrics changing them from +-60 to a clear 100.

Developed new sections regarding catering, rations and more.

Integrated and supported LiqPay payment flows ensuring uninterrupted transaction processing
within an existing production codebase.

Jul 2024 — Nov 202 5
Full-Stack Developer at DBB Software

Dnipro, Ukraine / Remote (Before Jan, 2025) Junior React Developer
DBB Software is a trusted partner in software development with 10 years
of proven industry expertise. They specialize in full-cycle custom
development and use their unique repository of pre-built components to
deliver top-quality products 50% faster than competitors.
Got promoted to Full-Stack role, defining development on frontend and backend sides in a
cross-functional team of 30+ engineers, QA, designers, analytics.

Owned estimations and resource allocation across 2 simultaneous services for a healthcare
project ensuring on-time delivery and balanced workload distribution.

Built a healthcare appointment booking platform for a USA healthcare provider, implementing
automation testing and security hardening using NestJS, PostgreSQL, AWS, Cypress.

Refactored legacy service, removing client-side issues and boosting productivity of a
dispatchers by 20%.

Maintained and stabilized a legacy full-stack application reducing technical debt and improving
system reliability using ReactJS, Node.js, and PostgreSQL.

Integrated AI-powered features into project products via GitHub Copilot.

Authored and maintained comprehensive documentation for existing microservices, establishing
a single source of truth to streamline onboarding and knowledge sharing across the engineering
team.

Architected and built a comprehensive Cypress E2E testing framework from the ground up for a
new microservice, ensuring robust code quality and regression prevention.

Apr 2023 — May 2024 Junior Full-Stack Developer at DiExp.Tech

Dnipro, Ukraine / Hybrid (Before Jul, 2023) Trainee Full-Stack Developer
Startup of seasoned product development experts specializing in
custom, full-cycle software solutions from Ukraine.
Engineered a custom music player and favorites management system from scratch, delivering a
seamless, high-performance user experience.

Developed a custom administrative dashboard enabling clients to seamlessly manage content,
update track metadata, and dynamically upload new albums and singles.

Refactored and redesigned legacy frontend modules for an e-commerce platform, improving UI
consistency and modernization

Successfully integrated and maintained an Israeli payment gateway within a legacy production
environment, ensuring 99.9% uptime and uninterrupted transaction processing.

Optimized core web vitals and rendering performance for a media-heavy photo platform,
significantly reducing page load times by 30%.

EDUCATION
Sep 2021 — Jun 2025 Oles Honchar Dnipro National University
Dnipro
study at the Faculty of Applied Mathematics
with a bachelor degree as a software engineer

VOLUNTEERING

Sep 2023 — Sep 2024 Head of Scientific Committee at Student Council of
Faculty of Applied Mathematics

Sep 2024 — Jun 2025 Advisor of Scientific Committee at Student Council of
Faculty of Applied Mathematics

Sep 2026 — Now Lecturer at ITStep Academy