Biloborodov

Serhii Biloborodov
Blockchain / Backend Engineer
Ukraine · Remote

LinkedIn: [open contact info](look above in the "contact info" section)
GitHub: github.com/serghd
Email: [open contact info](look above in the "contact info" section)
Phone: [open contact info](look above in the "contact info" section)

PROFILE

I'm passionate about backend engineering and blockchain technologies. Over the past few
years, I’ve been actively involved in backend development, infrastructure optimization, and
smart contract implementation across multiple blockchain ecosystems.

Backend developer with 10+ years of software development experience, including 6+ years in
blockchain infrastructure and smart contracts. Skilled in Web3 backend systems, Solidity
development, blockchain indexing infrastructure, and distributed systems. Experienced working
with EVM-based chains, Solana, and Graphene-based blockchains.

CORE SKILLS

● Backend: Node.js, TypeScript, JavaScript, Fastify, Express, NestJS
● Web3 & Protocols: Hardhat, Foundry, REST API, GraphQL, IPFS, Data Oracles
● Smart Contracts: Solidity (EVM), Solana (Rust, Anchor), EOS/WAX (C++)
● Blockchain Infrastructure: Indexers, Data Fetchers, On-chain Callers, Cloudflare
● Languages: C++ (C++11–23), Rust, TypeScript, JavaScript
● Databases: PostgreSQL, MySQL, MongoDB, Redis, SQLite
● DevOps & CI/CD: Docker, GitHub Actions, Git
● Tools: CLion, VS Code, QtCreator, CMake, Bash

PROFESSIONAL EXPERIENCE

Blockchain Developer
Osambit — Part-time · Remote
Sep 2025 – Present

● Develop smart contracts for EVM, Solana, and EOS/WAX blockchains
● Build Web3 backend services using Node.js, Fastify, Express, NestJS, TypeScript
● Design blockchain infrastructure including indexers, data fetchers, and on-chain tools
● Implement cryptocurrency payment solutions (server-side and client-side libraries)
● Collaborate with third-party smart contract auditors

Blockchain Developer
yard[hub] — Full-time · Remote
Jun 2023 – Sep 2025

● Developed smart contracts for ETH, EOS, and WAX blockchains
● Built Web3 backend services using Node.js, REST APIs, and GraphQL
● Implemented blockchain indexers and data pipelines for on-chain data access

Blockchain C++ Developer
DeepMine World — Full-time · Ukraine
Feb 2022 – Jun 2024

● Implemented smart contracts for ETH and WAX blockchains
● Designed token standards and tokenomics models
● Developed Web3 backend services and blockchain data indexers
● Implemented database sharding to support horizontal scalability
● Designed multi-layer smart contract interaction architecture

Blockchain C++ Developer
Prof-it LLC — Full-time · Ukraine
Jul 2018 – Jan 2022

● Core development of a large-scale Graphene-based blockchain (BitShares 2.0)
● Implemented new transaction types, objects, evaluators, plugins, and APIs
● Developed unit tests using Boost.Test
● Maintained infrastructure of 20+ servers and 80+ blockchain nodes
● Provided APIs for integration with external backends (Node.js, PHP, etc.)

C++ Developer
Online Games Development — Full-time · Ukraine
May 2009 – Jul 2018

● Developed large-scale online cash games and tournament platforms

● Designed client-server architecture and database schemas
● Implemented payment systems, transaction logging, and game history tracking
● Led core game algorithms and backend logic

LANGUAGES

English: Limited Working, B1-B2
Ukrainian: Native or Bilingual
Русский: Native or Bilingual

EDUCATION

Melitopol State Pedagogical Institute
Specialist Degree in IT
2002 – 2007
Grade: 4.5 / 5.0

ADDITIONAL

● Experience working with third-party smart contract auditors
● Infrastructure documentation (Doxygen, Markdown)
● Strong background in distributed and high-load systems