Олександр

Oleksandr Mashuta
Full-Stack / Backend-Focused Engineer
Ternopil, Ukraine | 📧 [open contact info](look above in the "contact info" section) | 📱 [open contact info](look above in the "contact info" section)
🔗 LinkedIn | 🐙 GitHub | ✈️Telegram

PROFESSIONAL SUMMARY
Full-Stack Engineer with a strong focus on backend architecture, high-throughput data processing, and
modern web systems using Node.js, TypeScript, React, Next.js, and PostgreSQL. Currently
pursuing a degree at Igor Sikorsky Kyiv Polytechnic Institute (KPI). Proven experience in designing
memory-efficient ETL streaming pipelines (1GB+ datasets), building real-time dual-storage architectures
(Firebase + LocalStorage), and developing full-stack applications with atomic database operations and
secure auth. Focused on writing clean, maintainable code following SOLID and system design best
practices.

TECHNICAL SKILLS
Languages: JavaScript (ES6+), TypeScript, C#
Backend & Cloud: Node.js, Express.js, REST APIs, C# / ASP.NET Core, Firebase 12 (Auth,
Firestore), JWT, OAuth2
Databases & ORMs: PostgreSQL, Prisma ORM, Entity Framework Core, Cloud Firestore
Frontend: React 19, Next.js, Vite 8, Tailwind CSS 4, Chart.js, Axios, HTML5/CSS3
Tools & Practices: Git, GitHub, Streams API, Event-Driven Architecture, Oxlint, npm/yarn,
Postman

FEATURED PROJECTS

BudgetFlow — Personal Budget Tracker | Full-Stack Developer
Live Demo | GitHub
Engineered a dual-runtime persistence architecture: zero-setup guest mode using LocalStora
ge and cloud sync via Firebase 12 (Auth + Cloud Firestore) without data overlap.

Built interactive analytics dashboards with Chart.js and implemented end-of-month spend
forecasting based on real-time spending pace.
Designed multi-currency conversion logic (USD/EUR/UAH) and secure UTF-8 BOM CSV export
with CSV formula injection protection.

Tech Stack: React 19, Vite 8, Tailwind CSS 4, Chart.js, Firebase 12, LocalStorage, date-fns.

Task Flow Engine | Backend / Node.js Developer
GitHub
Designed a memory-efficient streaming pipeline processing 1GB+ CSV files (~7M rows) without
memory overflow using Node.js fs.createReadStream and custom transform streams.
Implemented backpressure management via stream.pipeline() to automatically propagate
downstream bottlenecks upstream and keep the event loop non-blocking.
Developed custom data structures including bi-directional priority queues, memoization modules
with LRU/LFU/TTL eviction, and an event-driven alert system with Telegram API payload
simulations.
Tech Stack: Node.js (ES Modules), TypeScript, Node.js Streams API, EventEmitter, Custom Async
Utilities.

VideoHub | Full-Stack Developer
GitHub
Implemented HTTP 206 Partial Content video streaming and local file uploads for smooth
video playback.
Guaranteed database transactional consistency for user likes, comments, and subscriptions using
PostgreSQL & Prisma ORM.
Secured access using JWT authentication and designed a scalable backend structure for high
read/write loads.
Tech Stack: Node.js, Express.js, PostgreSQL, Prisma ORM, Next.js, React, TailwindCSS.

EDUCATION
Software Engineering / Computer Science
Igor Sikorsky Kyiv Polytechnic Institute (KPI) | Kyiv, Ukraine
Currently enrolled

LANGUAGES
Ukrainian: Native
English: Intermediate (B1/B2 — technical reading, writing, and documentation)