YEVHEN BEREZANSKYI

Systems Architect & Full-Stack Engineer (Rust / TypeScript / Web3)

📍 Odessa, Ukraine (Remote / Relocation) 📧 berezanskyi09@gmail.com 📱 +40 750 266 672 💬 Telegram: @eugene_br1zz 🌐 Portfolio 🔗 GitHub 💼 Freelancehunt (100% 5.0★)

Professional Summary

High-performance Systems Architect and Full-Stack Engineer with proven expertise in building low-latency distributed systems in Rust, production TypeScript / Next.js SaaS platforms, and reverse-engineered enterprise networking infrastructure. Proven track record of delivering mission-critical commercial solutions: from an on-chain Arbitrum One cross-DEX arbitrage engine processing market ticks in sub-microsecond latency (0–1 µs), to high-concurrency session-sharing reverse proxies and scalable full-stack applications. Strong advocate of zero-allocation architectures, deterministic state machines, kernel-level sandboxing, and test-driven reliability.

Technical Skills

Languages:

Rust (Edition 2021), TypeScript, JavaScript (ES6+), Solidity (0.8.24), Python, SQL, HTML5, CSS3

Systems & Low-Latency:

Tokio (Async Runtime), Alloy Primitives (U256, Address, B256), WebSocket Stream Decoding, Zero-Heap Allocation Hot Paths, Fixed-Point Arithmetic (Q96), Microsecond Telemetry (tracing)

Web3 & Blockchain:

Arbitrum One (L2), Arbitrum Nitro Node Synchronization, Uniswap V3, Camelot V3 (Algebra), Flash Swaps, On-Chain Revert Guards, MEV Sequencer Optimization, EVM, Smart Contracts

Full-Stack & Backend:

Node.js (Express, Fastify), Next.js (App Router), React, Django REST Framework, PostgreSQL, Supabase (Auth, RLS), Prisma ORM, RESTful APIs

DevOps & Security:

Linux (Ubuntu Server, Systemd Sandboxing, UFW Hardening, Hetzner Bare-Metal), Docker / Docker Compose, Windows Server 2019, Reverse Proxies (http-proxy-middleware), Git, GitHub Actions (CI/CD), Vercel

Integrations & APIs:

Stripe API (Metered Billing & Webhooks), Google Gemini API (LLM Integration), WebSockets, JWT Authentication (HttpOnly Cookies)

Key Featured Projects

Arbitrum One Cross-DEX Arbitrage Engine & Nitro Node Commercial Contract | 48,000 UAH Verified Safe

Tech Stack: Rust (Tokio, Alloy), Solidity, Docker, Systemd, Arbitrum Nitro, Hetzner Dedicated (Ubuntu 24.04)

High-Frequency Core: Architected an ultra-low latency cross-DEX arbitrage engine monitoring concentrated liquidity pools on Uniswap V3 and Camelot V3 (Algebra) for USDT/USDC on Arbitrum One (L2).
Sub-Microsecond Latency (0–1 µs): Engineered a zero-heap-allocation hot path using stack-allocated alloy::primitives (U256, Address, B256) and Tokio ring buffers (mpsc), achieving deterministic processing in 0–1 microsecond.
Fixed-Point Math & On-Chain Guard: Eliminated float drift using exact 256-bit Q96 fixed-point arithmetic. Developed ArbitrageExecutor.sol with Flash Swaps, Sequencer priority fees, and atomic On-Chain Revert Guard against slippage loss.
Node Infra & Hardening: Synchronized a local Arbitrum Nitro node via Docker on NVMe RAID0. Hardened systemd daemon via Linux kernel sandboxing (ProtectSystem=full, PrivateTmp, NoNewPrivileges, UFW). Verified with 38/38 passed tests and 5/5 delivered stages (10/10 rating).

Enterprise Multi-User Session Reverse Proxy Commercial Infrastructure Solution

Tech Stack: Node.js, Express, http-proxy-middleware, Windows Server 2019, PowerShell

Reverse Proxy Architecture: Developed an internal tunneling proxy allowing simultaneous multi-workstation LAN access to a single-seat protected web catalog, normalizing cookies, User-Agents, and headers over local HTTP.
Bidirectional State Sync & Conflict Resolution: Engineered real-time syncing of localStorage, sessionStorage, and Envoy cookies. Resolved race conditions and infinite auth loops (/portal-ui) via atomic client-server timestamp comparison.
High Availability & Auto-Recovery: Deployed as an auto-recovering Windows Server 2019 service with 1,000ms debounced disk persistence, socket trap handlers, and self-healing session purges on remote 401/403 errors.

PropText.ai — AI-Powered Real Estate SaaS Platform prop-text-ai.vercel.app

Tech Stack: Next.js (App Router), TypeScript, Supabase (PostgreSQL, Auth, RLS), Stripe API, Google Gemini API, Tailwind CSS

Production SaaS Architecture: Designed and deployed a multi-tenant web platform generating automated, high-converting property descriptions for real estate agencies.
Metered Billing Infrastructure: Integrated Stripe checkout and webhooks to manage a hybrid subscription and credit-consumption model, featuring atomic balance reconciliation and fraud prevention.
AI Model Pipeline: Integrated Google Gemini API with automated key rotation, dynamic rate-limiting, and context-engineered prompt templates.
Document Generation & Security: Built client-side Unicode-compliant PDF flyer generator. Enforced Supabase Auth with granular PostgreSQL Row-Level Security (RLS) policies and Zod schema validation.

Commercial E-Shop — High-Performance E-Commerce ecoshop-alpha.vercel.app

Tech Stack: React (Vite), Django REST Framework, PostgreSQL, Tailwind CSS, JWT

Full-Stack Implementation: Engineered an end-to-end e-commerce store with dynamic catalog filtering (category, price range, stock availability), real-time cart state management, and an integrated checkout pipeline.
Secure Session Handling: Implemented JWT authentication using HttpOnly, SameSite-strict cookies to mitigate XSS and CSRF attack vectors.
Database Optimization: Structured relational PostgreSQL schemas with optimized Django querysets, indexing, and REST serialization to achieve sub-50ms API response times.

Professional Experience

Systems & Full-Stack Freelance Engineer 2023 — Present

Freelancehunt / Direct Commercial Contracts Remote / Contract

Architected and deployed high-performance backend daemons, low-latency Web3 arbitrage engines, and enterprise networking proxies for commercial clients across Europe and Ukraine.
Achieved 100% 5-star customer rating across all completed safe-escrow contracts on Freelancehunt, including multi-stage milestone deliveries totaling over 48,000 UAH.
Collaborated closely with clients to formulate precise technical specifications, establish deterministic testing pipelines, and configure production bare-metal servers (Ubuntu 24.04, Hetzner, Windows Server).

Web Developer (Internship) 2024 (6 months)

Marine Plast Center / IT Internships Odessa, Ukraine

Developed reactive UI modules using React, Tailwind CSS, and modern JavaScript, improving page load speeds and interface responsiveness.
Participated in daily Agile/Scrum ceremonies, automated regression testing, code reviews, and Git feature-branch workflows.

Education

Master of Science (M.S.) in Computer Science / Information Systems — Odessa National University named after I. I. Mechnikov

2023 — 2024

Bachelor of Science (B.S.) in Applied Information Technology — Odessa State Ecological University

2021 — 2023

Associate Degree in Software Engineering (Junior Specialist) — Odessa College of Computer Technologies

2017 — 2021

Languages

English: Upper-Intermediate / Technical (B1/B2) — Professional proficiency in technical documentation, code reviews & architecture discussion.

Ukrainian: Native (Рідна мова).

Russian: Fluent.