• Department:
  • Location:
    Kharkiv, Ukraine or remote
  • Education:
    Master’s Degree
  • Experience:
    3+ years

General Description

  • We’re looking for talented, motivated Solidity developers with hands-on smart contract development experience and a good understanding of blockchain technologies for a long-term blockchain protocol in the Decentralized Finance space. We are looking for someone who is passionate about Blockchain and DeFi.
  • Primex Finance is the new decentralized liquidity protocol for cross-margin trading on DEXes built on Ethereum and Polkadot. Primex is backed by some of the world’s top crypto VCs.


  • Be available for full-time;
  • Experience with Solidity 3+ years, with Metamask, web3;
  • Good knowledge of truffle, openzeppelin, hardhat frameworks;
  • Experience with DeFi protocols;
  • Confirmed experience in commercial blockchain solutions over 2 years;
  • Familiarity with ERC20, ERC 721, ERC1155;
  • Familiarity with smart contracts and security vulnerabilities;
  • Gas optimizations experience;
  • English — Intermediate (written and spoken).

Would be nice

  • L2 protocols (optimistic and ZK rollups);
  • Polkadot.js, substrate;
  • Understanding of low-level parts of the ethereum blockchain;
  • Understanding how Ethereum stores state and data structures;
  • Development experience with JavaScript & Typescript;
  • A degree in computer science or relevant field or comparable experience;
  • knowledge of ABI (eg. variable mapping to storage slots);
  • Ethereum blockchain test tools (e.g.Truffle, Embark, Hard Hat, etc.);
  • Experience with writing automation tests;
  • Experience with Uniswap, SushiSwap, Aave;
  • EVM understanding;


  • Write smart contracts;
  • Write unit tests;
  • Integrate with existing DeFi/NFT protocols;
  • Research different existing DeFi/NFT protocols;
  • High quality and well-tested Solidity code, following the latest design and development patterns;
  • Write documentation, design flow diagrams, and review PRs;
  • Research, design, scope, and estimate what you need to do;
  • Collaborate with the UI team;
  • Constantly improve yourself by keeping up to date with the latest technologies trends.

We offer

  • Remote and flexible work hours;
  • Long-term and stable employment;
  • Cool distributed app project;
  • Competitive salary; 
  • Personal and professional growth;
  • Professional IT events compensation;
  • Account management of your contractor entity;
  • Paid vacation and sick days-off;
  • Paid English classes with an individual plan.

For Kharkiv team:

  • Paid lunches;
  • Comfortable office at the city center;
  • Ergonomic highly adjustable chairs for a healthy working experience;
  • Coffee, tea, ice cream, and nuts.