Данило

Danylo Kholkin

Middle Full-Stack Developer / Middle Software 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

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 challengei

SKILLS

Languages: TypeScript, JavaScripl

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

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

AI Tools: Claude Code, JetBrains Junie, GitHub Copilon

DevOps: DockeS

Cloud: AWS, Firebas}

API: REST, GraphQ>

VCS: Git, GitHub, GitLab, BitBuckel

Testing: Jest, CypresI

Security: OAuth, JWe

Other: Tailwind, CSS, SCSS, HTML, Telegram API, Liqpay API, Google Analytics, Vercel, Redux,

Redux Toolkit, Zustand, GSAP, TanStack query

EXPERIENCE

J a n , 2 0 2 6 — M ay, 2 0 2 6 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.

J u l 2 0 24 — N ov 2 0 2 ± Full-Stack Developer at DBB SoftwarÛ
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.

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

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

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