Владислав

VLADYSLAV
KOVALOV
Back-endDeveloper

HARD SKILLS EDUCATION
JavaScript HIGHER EDUCATION 2022-2024
TypeScript
V.O.SUKHOMLYNSKI NATIONAL UNIVERSITY OF MYKOLAIV,
Express.js / NestJS MSCS
React.js / NextJS

SQL (PostgreSQL)
NoSQL (MongoDB) WORK EXPERIENCE
Prisma
Docker BACKEND DEVELOPER 2024 - 2025
Strapi ROBOL
Pipedream Employees Statistics Service (Nest.js / Prisma): collects and processes
employee data—shifts worked, order count, total revenue, profit, average check
Pipedrive and profitability percentage.
Location Statistics Service (Nest.js / Prisma): aggregates per-location metrics
—orders, revenue, profit, unique shifts, average check and profit margin, with
SOFT SKILLS overall summaries.
Menu Items Statistics Service (Nest.js / Prisma): computes for each menu item
Team Collaboration units sold, total revenue, gross profit and profit percentage, with optional “no-
Communication sales” filter.
Sales Statistics Service (Nest.js / Prisma / ChartJS): generates overall sales
Adaptability KPIs (total revenue, order count, profit), time-based stats (hourly, weekly,
Continuous Learning daily/weekly/monthly dynamics), and breakdowns by payment method, order
method, status, popular items and employees.
Problem-Solving
PRRO Online & Offline Service (Nest.js): handles real-time (online) and offline
PRRO sessions via DOCTYPE 102/103.
LANGUAGE PRRO XML Library (TypeScript / xmlbuilder2 / Node.js): generates and signs
XML documents for PRRO fiscalization.
Legacy Code Maintenance (TypeScript / Nest.js): refactored and updated
English - intermediate
legacy modules, fixed critical bugs.
Ukrainian - native speaker Sales Statistics Optimization (Nest.js / Prisma): optimized large-volume
processing (>100 000 records) with batching, indexing and null-safe handling.
Clustered WebSocket Server (Node.js / Redis Pub/Sub): synchronized
CONTACT messages across workers using Redis Pub/Sub.
Fiscal Server Health Check (Serverless / AWS Lambda): moved periodic PRRO-
[открыть контакты](см. выше в блоке «контактная информация») server availability checks into a serverless function.
i18n Context via ClsService (Nest.js / nestjs-cls): injected per-request i18n
@vlad54703 context into services and error handlers.
[открыть контакты](см. выше в блоке «контактная информация») Private Library Docker Import (Docker / SSH Agent): configured Docker build to
fetch private GitHub package via SSH agent.
Vlad Kovalov Typed PRRO API Client (Nest.js / Axios / TypeScript): implemented a fully-
typed Axios client for interacting with PRRO API.
GitHub
Mykolaiv, Mykolaiv City,
Ukraine
 WORK EXPERIENCE

FULLSTACK DEVELOPER 2023 - 2024
OUTSOURCE
Profitability/Loss Calculation App (Next.js / Nest.js): Analyzing company
financial data using AI.(Next.js / Nest.js)
Employee Reward App (Streamlit): Bonus and achievement system for
employee motivation.
Telegram Bot and Mini-App (Nest.js): Developing a bot and mini-app for
Telegram integration.

BACKEND DEVELOPER 2022 - 2023
UNICORNPOWER
Backend Development (Node.js / NestJS / PHP): Developed and maintained
the backend of the platform.
CMS Integration (Strapi): Managed video content through Strapi.
Automation & Integration (Pipedream / Pipedrive): Automated workflows and
integrated with CRM for client management.
Database Management (PostgreSQL / MongoDB): Worked with relational and
NoSQL databases.
API & Payment Systems: Developed APIs and integrated payment systems.
Platform Optimization: Refactored and optimized platform performance.
PHP Server Support: Maintained the existing PHP server.
Telegram Bot Development: Designed and developed a Telegram bot for user
interaction and automation.

JUNIOR BACKEND DEVELOPER 2022 - 2023
ROOM4
Backend Development (Node.js): Developed and maintained the backend of
the platform using Node.js, NestJS, and PHP.
Database Management (PostgreSQL / MongoDB): Worked with relational
(PostgreSQL) and NoSQL (MongoDB) databases for querying and optimizing
data.
Docker: Containerized applications, created Dockerfiles, and used Docker
Compose for database integration.

CONTACT
[открыть контакты](см. выше в блоке «контактная информация»)

@vlad54703

[открыть контакты](см. выше в блоке «контактная информация»)

Vlad Kovalov

GitHub
Mykolaiv, Mykolaiv City,
Ukraine