Данило

Danylo Kholkin

Middle Full-Stack Developer / Middle Software Engineer

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

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

SUMMA RY
Middle Full-Stack Engineer with 3+ 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


S KILLS
Languages: TypeScript, JavaScript

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

E XP RI E ENCE

J a n , 2 0 2 6 — M ay, 2 0 2 6 Middle Full-Stack Developer at I P j
n ro ect HUB

Lviv, Ukraine InProject H B
U 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 .

O ptimi z
ed web app for a SE O and performance metrics changing them from + 60 to a clear 100 - .

Developed new sections regarding catering, rations and more .

Integrated and supported Li q Pay payment flows ensuring uninterrupted transaction processing

within an existing production codebase.

5

J u l 2 0 24 — N ov 2 0 2 Full-Stack Developer at DBB Soft ware

Dnipro, Ukraine / Remote
(Before Jan, 202 5) Junior React Developer
D BB Software is a trusted partner in software development with 10 years

of proven industry expertise. They speciali z e in full-cycle custom

development and use their uni q ue repository of pre-built components to

deliver top- q uality 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, Q A, designers, analytics .

O wned 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, PostgreS Q L, AWS, Cypress .

Refactored legacy service, removing client-side issues and boosting productivity of a

dispatchers by 20 %.

Maintained and stabili z
ed a legacy full-stack application reducing technical debt and improving

system reliability using ReactJS, Node.js, and PostgreS Q .

L

Integrated AI-powered features into project products via Git H ub 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 q uality and regression prevention.

A p r 2 0 2 3 — M ay 2 0 24 Junior Full-Stack Developer at DiExp.Tech

Dnipro, Ukraine / Hybrid
(Before Jul, 2023) Trainee Full-Stack Developer

Startup of seasoned product development experts speciali z ing in

custom, full-cycle software solutions from Ukraine. From design and

development to testing, launch, and maintenance, we craft exceptional

web and mobile applications tailored to your business needs.

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 moderni z
atio n

Successfully integrated and maintained an Israeli payment gateway within a legacy production

environment, ensuring 99.9 % uptime and uninterrupted transaction processing .

O ptimi z
ed core web vitals and rendering performance for a media-heavy photo platform,

significantly reducing page load times by 30 % .

EDUCAT ON I
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

V L O UNTEE RI G
N

S e p 2 0 2 3 — S e p 2 0 24 Head of Scientific Committee at Student Council of

Faculty of Applied Mathematics

S e p 2 0 24 — J u n 2 0 2 5 Advisor of Scientific Committee at Student Council of

Faculty of Applied Mathematics