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Serokell

Solidity Developer

Serokell
France · Full-time · Entry
Serokell is a fast-growing, fully remote software development company that works on innovative solutions for complex problems. We’re packed full of adventurous, curious, and inclusive folks who want to build cutting-edge software with modern technologies like functional programming.

This position is open now with a July start. This is a project-based hire with the option to extend if it is a good match. Submit your CV and we’ll reach out promptly.

We’re seeking a middle to senior level Solidity Developer to join a team of fierce and fun Serokellers.

Hiring Process Overview: We invite candidates to the HR screening as the first step. Next, we conduct a technical interview with those whose profiles align with our requirements. Successful candidates will receive an offer.

Requirements

  • Fluency with Ethereum or another EVM-based blockchain ecosystem
  • 2+ years in software development
  • 1+ years experience writing, testing, and deploying Solidity contracts
  • Hands-on experience with Hardhat, Foundry, Truffle, or Remix for development, testing, and debugging, including transaction submission, data retrieval, and key management
  • Understanding of security issues and best practices for Ethereum and De-Fi applications
  • Knowledge of popular token standards such as ERC-20, ERC-721, and ERC-1155
  • Experience developing and integrating decentralized applications, both backend and frontend
  • Basic understanding of cryptography primitives: public/private keys, signing, encryption, hashing
  • Knowledge of fundamental algorithms and data structures like hash tables, binary search trees, DFS, quicksort
  • Strong coding practices, including clean code structure, use of git, pull requests, and code review
  • Fluent English, strong communication and collaboration skills
  • Comfortable with daily stand-ups and asynchronous updates
  • Self-driven, proactive, teamwork-oriented, curious and inclusive mindset
  • Full-time commitment, around 140–160 hours per month
  • Comfortable overlapping with team time zones from UTC 0 to UTC -8

It Will Be a Significant Plus If You Have

  • Knowledge of TypeScript, Haskell, Rust, or OCaml
  • Experience conducting security audits and identifying vulnerabilities
  • Understanding of computer networks, HTTP, TCP/IP stack, and data synchronization models used in modern service APIs
  • Familiarity with build/deploy automation tools and CI/CD systems such as Docker, Nix, Kubernetes

Responsibilities

  • Create and implement secure and efficient Solidity contracts, ensuring scalability, reliability, and maintainability
  • Integrate contracts with EVM blockchain networks, often involving backend or frontend work
  • Review and audit code
  • Develop and execute unit tests, integration tests, and end-to-end tests
  • Write detailed documentation for code, including design specs, user guides, and API documentation
  • Stay updated on the latest developments in Solidity, Ethereum, and EVM-related technologies, cryptographic methods, and relevant programming languages
  • Optimize code performance and gas efficiency
  • Implement and enforce security best practices to protect contracts from common vulnerabilities
  • Provide ongoing support and maintenance for deployed applications, addressing user-reported issues and bugs

We Offer

  • Competitive salary.
  • Engaging international projects.
  • Participation in leading global conferences.
  • International and multicultural teams.
  • Fully remote work with flexible hours.
  • Ability to take time off as needed.
  • Investment in career and professional growth, with potential for wage increases.
  • Mentoring and training programs.
  • Opportunity to contribute to a leading functional programming blog.
  • Therapy sessions for well-being support.

By joining Serokell, you’ll become part of a warm community of ingenious engineers, computer scientists, designers, marketing experts, and other inventive minds. You’ll work on ambitious projects building the next generation of computer software, explore creative initiatives unhindered by bureaucracy, and enjoy our vibrant Slack channels—ranging from #music to #philosophyandtears (did we mention the massive custom emoji set?).

Key Skills

Ranked by relevance

solidity blockchain functional programming data structures security audits typescript haskell truffle docker slack rust cicd git
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Country Guide

France

Large economy with strong startup and AI ecosystem

Posted
Sep 01, 2025
Type
Full-time
Level
Entry
Location
Paris
Company
Serokell

Industries

Software Development

Categories

Engineering Information Technology

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