Blockchain Software Developer

Oleh C

Information

Available hours \ week
40 h/w
Seniority level
Middle
Years of experience
3.5 yrs.
Location
Ukraine, Kyiv
Nationality
Ukraine
Timezone
(GMT+02:00) Kyiv

Languages

German
Elementary (A2)
English
Upper-Intermediate (B2)

About

Oleh focuses on EVM smart contract engineering and blockchain data pipelines, with ~3.5 years of commercial experience as a Blockchain Software Develo. He delivers production Solidity, TypeScript and Rust code for token flows, storage coordination, and high-throughput node networks. He has built access controll and signature-verification logic, implemented Patricia Merkle proof checks, and designed an on-chain sharding load-balancer while improving gas cost on trafic paths. He also ships event indexing into structured databases, writes unit/integration tests, and closes audit findings under tight deadlines using practical Cryptography know‑how. Tooling includes Docker, CI/CD automation in GitHub workflows, plus Ethers.js for integration; he has exposure to REST API + SSE backends paired with Tauri clients, and experiments with n8n, LangChain, LangGraph. Domains covered include AI, decentralized storage, social platforms, advertising, etc. Master’s in Automation and Computer Integrated Technology, National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”.

Additional skills

Experience

Akave

Blockchain Software Developer

About the Project

An S3-compatible cloud saving up to 80% on storage costs, with zero egress fees, cryptographic verifiable audit trails, built-in ransomware protection and compliance-ready by design.

  • AI
  • Blockchain

Responsibilities

- Designed and deployed smart contracts to manage file storage within network nodes, including access control mechanisms, policy management, and signature verifications. - Implemented lightweight on chain verify mechanism for patricia merkle tries. - Designed and developed on-chain load balancer protocol for 8000+ shards distributed among nodes. - Optimized gas efficiency within high-trafic contract functions by 25%-40%. - Built an event indexer to monitor smart contract activity and extract on-chain data into a structured database. - Covered smart contract system with unit and integration tests. - Designed CI/CD to sync sdk versions between different language versions usign github automated workflows.

Skills & technologies

MESI

Smart Contract Developer

About the Project

A new kind of social expression app that inspires to create, express, interact, and earn while providing a deep sense of community and self-sovereignty.

  • Blockchain

Responsibilities

- Designed a smart contracts system for the ICO stage of the project. This included token, seller, vesting, and treasury contracts with multisig functionality. - Used Merkle tree data structure for whitelist logic, ensuring cost-effective updates and security throughout the process. - Covered the system with tests, achieving 98% test coverage. Performed fixes from the previous audit. Verified the token contract on-chain.

Skills & technologies

Somnia

Blockchain Software Developer

About the Project

Somnia is a high-performance, cost-efficient EVM-compatible Layer 1 blockchain capable of processing over 1,000,000 transactions per second (TPS) with sub-second finality. It is suitable for serving millions of users and building real-time mass-consumer applications like games, social applications, metaverses, and more, all fully on-chain.

  • Blockchain

Responsibilities

- Submitted audit fixes for Somnia core smart contracts for managing node network. - Resolved, documented and tested 2 Critical, 7 High, 10 Medium and 7 Low priority issues within 2 weeks.

Skills & technologies

RUTA

Software Engineer

About the Project

RUTA is a comprehensive desktop application built with Tauri, React, and Rust that provides real-time monitoring and analytics for ERC-20 token transfers on Ethereum and other EVM-compatible chains. The application combines a high-performance Rust backend with a modern React frontend to deliver real-time insights into blockchain transactions.

  • Blockchain

Responsibilities

- Built a Rust indexer service polling blockchain via RPC, parsing ERC-20 Transfer events into PostgreSQL. - Exposed REST + SSE API consumed by a Tauri + React frontend for live updates and charts.

Skills & technologies

PROMO

Blockchain Software Developer

About the Project

On-chain Rewarded Ads Platform with airdrops on TON network.

  • Advertising
  • Blockchain

Responsibilities

Designed core logic idea, developed smart contracts for airdrop functionality using FunC language.

Skills & technologies

Education

National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”

2017 - 2023
Master of Automation and Computer Integrated Technology

Rust Bootcamp

2025 - 2025
Rust Software Developer