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Guillian BercellaGB

Guillian Bercella

Full Stack Developer

€250/day
Annecy, FR
0-2 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Guillian

Full Stack Developer specializing in blockchain, automation, and data. I design custom solutions in Python and Rust for clients who need performance and reliability.

My areas of expertise:

Algorithmic trading and blockchain bots (Ethereum, EVM, DeFi)
Solidity smart contracts: development, audit, and deployment
Advanced web scraping with anti-detection and proxy rotation
Automation of business processes and API integration
Real-time monitoring via WebSocket and alerting systems
What I bring: a solid technical approach combined with a concrete understanding of business challenges. I work independently, deliver on time, and communicate clearly at each stage of the project.

Main stack: Python, Rust, Solidity, JavaScript, PostgreSQL, Docker, Linux.
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • INDEPENDANT
    Freelance Blockchain Developer
    April 2024 - Today (2 years and 2 months)
    Design and development of a real-time algorithmic trading system on the blockchain (Rust + Python). High-performance architecture with inter-process communication via TCP/WebSocket bridge, mempool monitoring, and gas optimization.
    Python Rust Blockchain
  • INDEPENDANT
    Smart Contracts & DeFi Developer
    April 2024 - Today (2 years and 2 months)
    Development and deployment of EVM smart contracts (Solidity). Integration with DeFi protocols, management of precompile interactions, and automation of on-chain workflows.
    Solidity Blockchain Python Rust
  • INDEPENDANT
    Automation & Data Developer
    April 2024 - Today (2 years and 2 months)
    Creation of web scraping tools (Selenium, Playwright) with proxy rotation and anti-detection. Automation of business processes and integration of third-party APIs.
    Web Scraping Python

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Education

  • Self-taught
    Autodidacte

Skill set (7)

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