Cowchain

About Cowchain
Cowchain is a Web3 development company behind PixelVerse, StepApp, RetroBridge, Hybrid, Tenet, and 150+ other blockchain products with $180M+ combined market cap. We're a team mostly based in Ukraine, with some across Europe, fully remote. We build across DeFi, GameFi, cross-chain bridges, AI agents, NFT platforms, and Telegram mini-apps.

We look for people who take ownership, think deeply, and can work independently, ask the right questions, and move through uncertainty without waiting for step-by-step instructions. No unnecessary hierarchy—you talk directly to the founders when it matters. We value what you bring over how long you've been around.

About the role
We're looking for a Backend Developer with strong Node.js experience to build and ship blockchain products, mainly in the Solana ecosystem, with occasional EVM-related tasks. You'll work on real client products: payment flows, swaps, cross-chain bridges, token mechanics, and transaction logic.

We care less about how many years you've logged and more about how you think: how you break down a problem, gather requirements before building, weigh trade-offs, and reason about architecture.

What you'll do

• Build new features and services from scratch, and support existing ones
• Build, sign, and send transfer and swap transactions
• Work with Solana mechanics: token accounts, priority fees, multi-signature transactions, transaction building
• Integrate with Solana/DeFi protocols such as Pump.fun, Jupiter, Raydium, Meteora, and similar platforms
• Take part in architecture discussions—your input on design decisions matters
• Debug, fix, and harden production solutions

What we're looking for

• 3+ years of commercial backend experience
• Strong Node.js experience
• Solid understanding of blockchain mechanics: gas, priority fees, token account creation, multi-signatures
• Hands-on experience with Solana tooling: Solscan, Solana Explorer, transaction analysis and transaction building
• Experience building, signing, and sending transfer and swap transactions
• Comfortable with Bignumber.js / bn.js for safe big-number math
• Experience with Solana/DeFi protocols such as Pump.fun, Jupiter, Raydium, Meteora, or similar
• Familiarity with Jira, Git, and GitFlow

Nice to have

• Experience with EVM-based chains: Ethereum, Polygon, BSC, Arbitrum, Base, Avalanche, etc.
• Experience with cross-chain bridges: lock/mint and liquidity models
• Experience with token launch mechanics or meme-coin creation
• Outsource/agency background

What we offer

• Fully remote work from anywhere
• Competitive salary with activity bonuses
• Paid vacation and sick leave
• AI tool subscriptions: ChatGPT, Claude, Gemini
• Internal knowledge sharing and Personal Development Plans
• Individual onboarding tailored to your role and project
• Direct access to founders and C-level — decisions happen fast, no unnecessary bureaucracy