Cowchain

Cowchain blockchain development company is actively looking for QA  Manual to join our development team.

About us:
Cowchain have successfully completed 150+ projects mainly on EVM-based blockchains such as Ethereum, Polygon, Arbitrum, Base including Coinmarketcap leaders with 180M+ total capitalization and 20M+ daily trading volume in Move2Earn, Play2Earn and DeFi industries.

Key Responsibilities

• Testing new features
• Maintaining bug log
• Work with the development team
• Work within the Scrumban environment
• Have fun

Required Skills:

• 1 year of manual testing
• Experience in JIRA
• Good understanding web3 domain, user experience!

Nice to Have

• Experience in FinTech / Crypto / Blockchain 

What We Offer

• Work on a real production crypto-fintech system
• Flexible working schedule, remote work
• Modern tech stack and non-trivial engineering challenges
• Ability to dive into fast-growing blockchain/crypto industry
• Paid vacations, sick leaves
• Strong engineering culture
• 100% friendly/family team

Cowchain blockchain development company is actively looking for Solidity Developer to join our development team.


About us:
Cowchain have successfully completed 150+ projects mainly on EVM-based blockchains such as Ethereum, Polygon, Arbitrum, Base including Coinmarketcap leaders with 180M+ total capitalization and 20M+ daily trading volume in Move2Earn, Play2Earn and DeFi industries.


Required skills:
— Around 2 year+ commercial experience in smart contract development on Solidity

— Rust 
— Hardhat/truffle/Foundry
— ERC721/ERC1155/ERC20/Chainlink
— JIRA, gitflow
— Node.js experience
— Web3/Etheres libraries
— LayerZero
— PDAs/CPI, SPL Token/Token-2022, Anchor testing, program accounts

What will you do:
— Smart contracts development for DeFi, NFT, GameFi solutions
— Integration of smart contract to ReactJs frontend
— Bugfixes and support existing solutions
— Participate in project architecture discussions
— Build solutions from scratch as well as join on-going development process
— Have fun;) 

What we offer:
— Flexible working schedule, remote work
— Competitive salary with bonuses for activities
— Ability to dive into fast-growing blockchain/crypto industry
— Work with modern tech stack (blockchain)
— Paid vacations, sick leaves
— 100% friendly/family team

Cowchain blockchain development company is actively looking for Solana Developer to join our development team.

About us:
Cowchain have successfully completed 150+ projects mainly on EVM-based blockchains such as Ethereum, Polygon, Arbitrum, Base including Coinmarketcap leaders with 180M+ total capitalization and 20M+ daily trading volume in Move2Earn, Play2Earn and DeFi industries.

Responsibilities:

• Design, develop, and deploy decentralized applications (dApps) and smart contracts on the Solana blockchain
• Collaborate with our team to define project requirements, architecture, and technical solutions
• Implement efficient and scalable solutions that leverage the unique features of the Solana blockchain
• Optimize performance and throughput of Solana-based applications through latency optimization techniques
• Stay up-to-date with the latest developments in Solana blockchain technology and incorporate new features and improvements into our projects
• Conduct code reviews, testing, and debugging to ensure the quality and reliability of our blockchain solutions
• Work closely with other team members, including front-end developers, designers, and product managers, to deliver cohesive and user-friendly solutions

Required skills:

• Proven experience as a software developer with a focus on blockchain technology
• Strong proficiency in Rust programming language, with experience in building applications on the Solana Blockchain
• Ability to use Solscan to analyze data
• Compiling, signing and sending transfer transactions
• Compiling, signing and sending swap transactions
• JIRA, gitflow

We’ll match if you have

• Independent thinking and proactive position in development
• Strong problem-solving skills with a keen ability to think analytically and approach complex challenges
• Attention to detail
• Strong tech research skills
• Excellent communication and collaboration skills, with the ability to work effectively in a team-oriented environment
• Knows how to leverage AI tools to enhance coding efficiency and productivity

What we offer

• Flexible working schedule, remote work
• Competitive salary with bonuses for activities
• Ability to dive into fast-growing blockchain/crypto industry
• Work with modern tech stack (blockchain)
• Paid vacations, sick leaves
• 100% friendly/family team

Cowchain blockchain development company is actively looking for Solidity Developer to join our development team.

About us:
Cowchain have successfully completed 150+ projects mainly on EVM-based blockchains such as Ethereum, Polygon, Arbitrum, Base including Coinmarketcap leaders with 180M+ total capitalization and 20M+ daily trading volume in Move2Earn, Play2Earn and DeFi industries.

Required skills(optional):

• Around 1 year+ commercial experience in smart contract development on Solidity
• ERC721/ERC1155/ERC20/Chainlink
• JIRA, gitflow
• Node.js experience
• Web3/Etheres libraries

What will you do:

• Smart contracts development for DeFi, NFT, GameFi solutions
• Integration of smart contract to ReactJs frontend
• Bugfixes and support existing solutions
• Participate in project architecture discussions
• Build solutions from scratch as well as join on-going development process
• Have fun;) 

What we offer

• Flexible working schedule, remote work
• Competitive salary with bonuses for activities
• Ability to dive into fast-growing blockchain/crypto industry
• Work with modern tech stack (blockchain)
• Paid vacations, sick leaves
• 100% friendly/family team

Cowchain blockchain development company is actively looking for Backend Developer to join our development team.

About us:
Cowchain have successfully completed 150+ projects mainly on EVM-based blockchains such as Ethereum, Polygon, Arbitrum, Base including Coinmarketcap leaders with 180M+ total capitalization and 20M+ daily trading volume in Move2Earn, Play2Earn and DeFi industries.

Key Responsibilities

• Design and develop backend services using TypeScript and NestJS
• Build and maintain event-driven architectures using Kafka and Redis
• Implement and evolve transactional patterns:
  Saga, Idempotency, Ledger, Outbox / Inbox
• Develop blockchain-related logic:
  • Confirmation policies per chain
  • Nonce / sequence management
  • Fee management
  • Transaction de-duplication
  • Backfill and reconciliation processes
• Integrate and maintain multiple blockchain networks:
  Bitcoin, Ethereum, Solana, Tron, TON
• Work with RPC providers (QuickNode, Alchemy, PublicNode, TonOrbs, Blockstream)
• Ensure secure key management using HashiCorp Vault
• Build reliable financial and accounting flows with strong auditability
• Monitor and improve system reliability using Sentry and structured logging
• Participate in architectural decisions and technical planning

Requirements

• 4+ years of experience in backend development
• Strong proficiency in TypeScript and Node.js
• Hands-on experience with NestJS
• Solid understanding of distributed systems
• Experience with Kafka, Redis, and PostgreSQL
• Real-world experience with blockchain integrations
• Understanding of:
  • Transaction lifecycle on different blockchains
  • Confirmations, reorgs, nonces, fees
  • Financial consistency and reconciliation
• Experience with event-driven and fault-tolerant architectures
• Familiarity with security best practices (keys, secrets, access control)
• Ability to work independently and make architectural decisions

Nice to Have

• Experience in FinTech / Crypto / Payments
• Experience designing ledger-based systems
• Familiarity with AML/KYC integrations
• Experience with high-load or mission-critical systems
• Prior work with multi-chain platforms

What We Offer

• Work on a real production crypto-fintech system
• Flexible working schedule, remote work
• Modern tech stack and non-trivial engineering challenges
• Ability to dive into fast-growing blockchain/crypto industry
• Paid vacations, sick leaves
• Strong engineering culture
• 100% friendly/family team

Cowchain blockchain development company is actively looking for Backend Developer to join our development team.

About us:
Cowchain have successfully completed 150+ projects mainly on EVM-based blockchains such as Ethereum, Polygon, Arbitrum, Base including Coinmarketcap leaders with 180M+ total capitalization and 20M+ daily trading volume in Move2Earn, Play2Earn and DeFi industries.

We’ll match if you have

• Independent thinking and proactive position in development
• Strong problem-solving skills with a keen ability to think analytically and approach complex challenges
• Attention to detail
• Strong tech research skills
• Excellent communication and collaboration skills, with the ability to work effectively in a team-oriented environment
• Knows how to leverage AI tools to enhance coding efficiency and productivity

Required skills

• Experience in Backend development
• JIRA, git-flow

Will be a huge plus

• Web3 knowledge and user experience

What will you do

• New features development
• Bugfixes and support existing solutions
• Participate in project architecture discussions
• Build solutions from scratch as well as join ongoing development process
• Have fun

What we offer

• Flexible working schedule, remote work
• Competitive salary with bonuses for activities
• Ability to dive into fast-growing blockchain/crypto industry
• Work with modern tech stack (blockchain)
• Paid vacations, sick leaves
• 100% friendly/family team

Cowchain blockchain development company is actively looking for Frontend Developer to join our development team.

About us:
Cowchain have successfully completed 150+ projects mainly on EVM-based blockchains such as Ethereum, Polygon, Arbitrum, Base including Coinmarketcap leaders with 180M+ total capitalization and 20M+ daily trading volume in Move2Earn, Play2Earn and DeFi industries.

We’ll match if you have

• Independent thinking and proactive position in development
• Strong problem-solving skills with a keen ability to think analytically and approach complex challenges
• Attention to detail
• Strong tech research skills
• Excellent communication and collaboration skills, with the ability to work effectively in a team-oriented environment
• Knows how to leverage AI tools to enhance coding efficiency and productivity

Required skills

• Experience in Frontend development
• JIRA, git-flow

Will be a huge plus

• Web3 knowledge and user experience

What will you do

• New features development
• Bugfixes and support existing solutions
• Participate in project architecture discussions
• Build solutions from scratch as well as join ongoing development process
• Have fun

What we offer

• Flexible working schedule, remote work
• Competitive salary with bonuses for activities
• Ability to dive into fast-growing blockchain/crypto industry
• Work with modern tech stack (blockchain)
• Paid vacations, sick leaves
• 100% friendly/family team