Олег

OLEG BALTAROVYCH
FULL-STACK ENGINEER | BACKEND-FOCUSED
Node.js / TypeScript / React / Distributed Systems

UKRAINE | [open contact info](look above in the "contact info" section)

[open contact info](look above in the "contact info" section)

PROFILE

Full-Stack Engineer with 4+ years of commercial experience delivering React-based applications and scalable
backend systems, with a strong focus on distributed architecture. Owned end-to-end push notification platforms
processing millions of notifications per month across Android and iOS. Experienced in asynchronous processing,
message queues, horizontal scaling, PostgreSQL, and AI-assisted development workflows.

TECHNICAL EXPERTISE

Core: TypeScript · JavaScript · Node.js · NestJS · REST APIs · C# · SQL

Architecture: Service-oriented systems · Microservices · Workers · Scheduling · Horizontal scaling

Data & messaging: PostgreSQL · MySQL · MongoDB · Redis · RabbitMQ · TypeORM

Frontend & tools: React · Custom-styled components · Docker · FCM · APNs · Telegram Bot API

AI & quality: Cursor · OpenAI Codex · AI context/rules configuration · Unit tests · Cypress

Additional: Solidity · DEX integrations · Subgraph · React Native · AngularJS

EXPERIENCE

Backend / Full-Stack Engineer | Onyx
Mar 2026 – Oct 2026

• Owned the Push Service, Scheduling Service, and Push Worker within a large service-oriented platform.

• Scaled notification processing from hundreds of thousands to millions of pushes per month for Android and iOS.

• Implemented horizontal scaling and supported asynchronous workloads using Redis, RabbitMQ, and background
workers.
• Integrated scheduling and delivery workflows across independently operating services.

• Developed operational metrics, monitoring capabilities, and React-based notification management interfaces.

• Used AI-assisted development with tailored project context and rules to maintain development consistency
across the codebase.
Stack: Node.js, TypeScript, PostgreSQL, Redis, RabbitMQ, React, FCM, APNs

Full-Stack / Backend Engineer | Sion
Aug 2025 – Mar 2026

• Independently built and maintained an end-to-end push platform, from backend architecture to React administration UI.

• Delivered one-time, recurring, and event-triggered campaigns with timezone-aware scheduling.

• Integrated FCM and APNs for Android and iOS delivery; improved monolithic processing through queues and workers.

• Created custom-styled UI components and streamlined workflows for campaign operators.

• Automated operational tasks through Telegram bot and Google Sheets integrations.

Stack: Node.js, TypeScript, PostgreSQL, Redis, RabbitMQ, React, FCM, APNs, Telegram Bot API, Google Sheets

OLEG BALTAROVYCH / CURRICULUM VITAE 1 / 2

OLEG BALTAROVYCH FULL-STACK ENGINEER | BACKEND-FOCUSED

EXPERIENCE · CONTINUED

Backend / Blockchain Developer | Peanut Trade
Aug 2024 – Apr 2025

Contributed to blockchain trading platforms built around service-oriented architecture.

• Integrated Aerodrome V2/V3 DEX protocols, blockchain events, transaction creation, and smart contract interactions.

• Built trading backend functionality across multiple blockchains, exchanges, and liquidity pools.

• Worked with Node.js/NestJS and C# services for blockchain monitoring, transaction analysis, and strategy execution.

• Used Redis and RabbitMQ for inter-service messaging; expanded APIs and DEX integrations.

Stack: Node.js, NestJS, C#, MySQL, TypeORM, Redis, RabbitMQ, Docker, Solidity, Subgraph

Full-Stack / Blockchain Developer | Bon / Emuni Solution
Feb 2023 – Apr 2024

• Developed automated cryptocurrency trading bots based on market conditions and blockchain activity.

• Implemented wallet monitoring, market analysis, and data-processing workflows with PostgreSQL and MongoDB.

• Created Node.js automation scripts and worked with Solidity smart contracts.

• Contributed to web interfaces supporting trading automation and operations.

Stack: Node.js, JavaScript, PostgreSQL, MongoDB, Solidity, HTML, CSS

Full-Stack Developer | ArtCodeVision
Mar 2022 – Jul 2022

• Maintained a salon management ecosystem spanning web applications, mobile apps, and backend services.

• Resolved application issues and supported database operations and existing frontend/backend components.

Stack: Node.js, PostgreSQL, React Native (Expo), AngularJS

Software Developer | GlobalLogic
Aug 2021 – Feb 2022

• Developed JavaScript web scraping and data collection workflows with the Bright Data framework.

• Implemented structured website data extraction and maintained automation scripts.

• Created and maintained Cypress end-to-end tests for web application functionality.

Stack: JavaScript, Bright Data, Cypress, HTML, CSS, jQuery

EDUCATION

Bachelor’s Degree in Computer Science · National Forestry University of Ukraine · 2017–2022

OLEG BALTAROVYCH / CURRICULUM VITAE 2 / 2