Roman

Roman Ustymenko
Full Stack Developer

Profile Details
Full Stack Developer with 3+ years of experience building applications Alicante, Spain
using Node.js, TypeScript, Express.js, NestJS, React, and React Native. tg: @romeiw

Experienced in developing REST APIs, microservice-based systems, [відкрити контакти](див. вище в блоці «контактна інформація»)
Telegram bots integrations, caching and queue solutions, and
Hard skills:
deployment automation. Worked across the full development lifecycle,
from backend architecture and database design to infrastructure setup, Node.js, JavaScript, TypeScript,
monitoring, and maintenance. Express.js, NestJS, Webpack,
React.js, React Native, Redux,
Skilled in designing scalable backend services, working with SQL and
Mocha, Microservices, Redis, Linux,
NoSQL databases, integrating third-party services, and building CI/CD
AWS, Grafana, Ansible, Nginx,
pipelines. Experienced in deploying and maintaining applications on
Docker, Docker Compose, SQL,
AWS using Docker, Nginx, and Ansible, while leveraging Grafana for
NoSQL, MongoDB, PostgreSQL,
monitoring and performance analysis.
MySQL, REST API, CI/CD, Firebase,
Sequelize, Telegram bot API/
Employment History Telegraff.js, Knex.js, socket.io, Git,
Promotional Website Platform (NDA) WebSockets, Postman, Figma, OOP,
Full Stack / Backend-oriented Developer SOLID
May 2022 — March 2026

Worked on a platform for creating, managing, and deploying
Soft skills:
promotional websites, enabling clients to quickly launch custom promo
Problem-solving mindset, Analytical
sites for product marketing. Participated in backend architecture design
thinking, Attention to detail,
and contributed to backend services, infrastructure automation,
Adaptability to new technologies
analytics, and user-facing components.
and challenges, Time management
Key responsibilities and achievements: and prioritization, Continuous
learning and self-development
● Developed backend services and REST API functionality using
NestJS for website creation, content management, third-party Languages
integrations, analytics, and client-facing platform features. Ukrainian: Native
● Built configurable UI widgets with React and integrated their setup English: Intermediate
flow with a Telegram bot using Telegraf.js, allowing clients to add
and customize widgets during website creation and editing.
● Developed a domain setup module that automated the flow of
selecting and purchasing a domain through the Telegram bot,
configuring DNS records via Cloudflare, generating a new Nginx
configuration file with the required domain settings, and
provisioning SSL certificates, replacing a previously manual setup
process.
● Implemented a custom short URL service using Express.js,
including traffic analytics, Docker-based configuration, Ansible
deployment playbooks, and CI/CD workflows via GitHub Actions.

● Implemented visitor session logic, activity tracking, and a real-time
support chat module using NestJS, React, Socket.io, Redis, and
Redis Pub/Sub, enabling communication between website visitors
and site owners while collecting engagement data for analytics.
● Built an observability and analytics pipeline that collected Nginx
logs, short URL service logs, and user activity metrics, shipped
them via Promtail to Loki, and visualized traffic, visitor activity, and
campaign performance data in Grafana dashboards.
● Automated deployment of self-hosted client environments using
Docker, Docker Compose, and Ansible, enabling full platform
instances, including the Telegram bot, web application, monitoring
stack, and supporting services, to be deployed with reduced
manual setup.
● Worked with AWS EC2 for service deployment and AWS S3 for
storing and managing media assets through S3 API integrations.

Tech stack: Node.js, Typescript, Javascript, nest.js, express.js, react.js,
sequelize, telegraf.js, redis, docker, ansible, nginx, Grafana, AWS,
Cloudflare, MySQL, PostgreSQL, GitHub Actions.

Projects
Like-minded Community App
React Native Developer
July 2024 — April 2025

Worked on a cross-platform mobile application designed to connect
people with shared interests through events hosted at local venues,
while helping venues attract visitors through event-based engagement.

● Developed the mobile application using React Native and
TypeScript, covering core UI screens, navigation flows,
Redux-based state management.
● Implemented registration and authentication flows, integrating
Firebase for data storage and Remote Config.
● Implemented map-based venue and event discovery functionality
using Mapbox.
● Developed adaptive mobile layouts based on provided designs
using TailwindCSS and implemented localization with i18next.

Tech stack: Node.js, Typescript, React Native, Firebase, TailwindCSS,
Redux, Mapbox.

Education
Bachelor's Degree in Computer Engineering, The Military
Institute of Telecommunication and Information Technologies
named after the Heroes of Kruty, Kyiv
July 2017 — December 2021