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SORAMITSU Shibuya City Tokyo Japan
🗓  Mon, Jan 27 Arbitrum Auditing Blockchain CI/CD Crypto DEX Decentralized Systems Ethereum Ethers.js Fintech Git/Github Hardhat JavaScript Layer 1 Polkadot.js Polygon Python QA/Testing Rust Solidity Truffle Web3.js Distributed team Health/medical insurance
is an award-winning global financial technology company with expertise in developing blockchain-based solutions for digital asset and identity management. Our mission is to use blockchain to promote innovation and solve pressing societal challenges. SORAMITSU is the developer of and major contributor to the open-source blockchain platform Hyperledger Iroha, which is tailored for enterprise and public-sector use. Hyperledger Iroha, a project of Hyperledger Foundation, part of the Linux Foundation, has a permissions system that is scalable and performant. Utilizing blockchain, SORAMITSU has developed a digital currency for the National Bank of Cambodia, a CBDC Proof-of-Concept with the Bank of the Lao PDR, a closed-loop payment system for the University of Aizu in Japan, an identity verification system prototype for Bank Central Asia in Indonesia, we were finalists in the Monetary Authority of Singapore CBDC Challenge, and are current
is an award-winning global financial technology company with expertise in developing blockchain-based solutions for digital asset and identity management. Our mission is to use blockchain to promote innovation and solve pressing societal challenges.

SORAMITSU is the developer of and major contributor to the open-source blockchain platform Hyperledger Iroha, which is tailored for enterprise and public-sector use. Hyperledger Iroha, a project of Hyperledger Foundation, part of the Linux Foundation, has a permissions system that is scalable and performant.

Utilizing blockchain, SORAMITSU has developed a digital currency for the National Bank of Cambodia, a CBDC Proof-of-Concept with the Bank of the Lao PDR, a closed-loop payment system for the University of Aizu in Japan, an identity verification system prototype for Bank Central Asia in Indonesia, we were finalists in the Monetary Authority of Singapore CBDC Challenge, and are currently participating in Asia-Pacific's first proof-of-concept test of a cross-border, multi-currency security settlement system using distributed ledger technology with the Asian Development Bank. We have also conducted proof-of-concept tests for several major Japanese enterprises, and are active contributors to open source projects, such as Klaytn, South Korea's leading Layer-1 blockchain, KAGOME, the C++ Polkadot Host implementation, the SORA crypto-economic system, the Polkaswap DEX, and the DeFi wallet, Fearless Wallet

Based on these experiences, SORAMITSU aims to deploy cutting-edge technology on a global level in order to expedite financial inclusion and health, mitigate economic inefficiencies, and contribute to the fulfilment of the Sustainable Development Goals.

You can find out more by visiting our homepage at soramitsu.co.jp or check out our Twitter profile.

We are seeking a highly skilled blockchain developer with deep expertise in blockchain technologies and smart contract development, focusing on Solidity, Ethereum, and various Layer 1 and Layer 2 protocols. This role will involve designing, implementing, and optimizing secure and scalable blockchain solutions.

You will be responsible for:

  • Develop, deploy, and maintain secure, efficient, and scalable smart contracts on Ethereum and other blockchain networks.
  • Architect decentralized systems and define smart contract standards for new projects and features.
  • Lead code reviews and provide mentorship to junior and mid-level developers.Optimize smart contract code for gas efficiency, performance, and security.
  • Collaborate with cross-functional teams including frontend developers, product managers, and security experts.Identify and mitigate security risks within smart contracts.
  • Stay up-to-date with the latest trends, tools, and best practices in Solidity and blockchain development.
  • Perform rigorous testing and auditing of contracts, and ensure all code is secure and bug-free.

Requirements:

  • 3+ years working specifically with Solidity and Ethereum-based development.
  • Deep understanding of Ethereum's architecture, smart contracts, and related technologies.
  • Proficient in Solidity, Web3.js, and Ethers.js.Experience with deploying and interacting with smart contracts on Ethereum, Binance Smart Chain, or other EVM-compatible blockchains.
  • Familiarity with common design patterns (e.g., ERC-20, ERC-721, ERC-1155) and decentralized protocols.Expertise in smart contract security practices, including common vulnerabilities (e.g., reentrancy, overflow/underflow, front-running).
  • Knowledge of decentralized finance (DeFi) protocols and their smart contract ecosystems.
  • Experience with testing frameworks (e.g., Truffle, Hardhat, Foundry).
  • Experience with CI/CD pipelines and blockchain-specific deployment strategies.
  • Ability to communicate complex technical concepts effectively to both technical and non-technical stakeholders.
  • Strong problem-solving, debugging, and optimization skills.
    Preferred:
  • Experience in developing for Layer 2 networks or alternative blockchain protocols (e.g., Optimism, Arbitrum, Polygon).
  • Familiarity with cross-chain technologies and bridging protocols.
  • Experience with smart contract auditing tools like Slither, MythX, and others
  • Experience with Polkadot ecosystem (Rust, Substrate)

General Skills:

  • Programming Languages: Solidity, JavaScript, Python, with knowledge of Rust considered a plus.
  • Blockchain Platforms: Ethereum, Binance Smart Chain, Polygon, Arbitrum, Optimism, etc.
  • Frameworks & Libraries: Truffle, Hardhat, Foundry, Web3.js, Ethers.js.
  • Security Best Practices: Smart contract auditing, vulnerability mitigation, best practices for gas optimization.
  • Collaboration Tools: Git, GitHub/GitLab, JIRA, Slack, etc.
  • Soft Skills: Strong communication in English, problem-solving, and analytical thinking.

Additional Requirements:

  • Please include a link to your GitHub profile showcasing examples of your code or repositories where you’ve contributed.

What we offer:

  • A relaxed remote-first (work from anywhere) work environment with flexible working hours
  • A permanent, full-time role with a rapidly growing international team of professionals
  • An educational budget to support your continued growth and development
  • Opportunities to attend global meetups and conferences for learning and/or speaking engagements
  • An opportunity to be a part of an award-winning team designing a better world through decentralized technologies

This is a remote position. Our distributed team is mostly spread across Europe and Asia. Team meetings are held generally during European working hours, and it is expected that you would adapt if necessary and be available accordingly.

If you have the required qualifications and are passionate about the Web3 industry, we encourage you to apply for this exciting opportunity.

SORAMITSU values diversity and is committed to providing equal opportunities for all applicants and employees. Our employment decisions, such as hiring, promotion, discipline, and termination, are based solely on an individual's qualifications, performance, and business needs. We do not discriminate against anyone on the basis of their race, color, religion, marital status, age, national origin, ancestry, physical or mental disability, medical condition, pregnancy, genetic information, gender, sexual orientation, gender identity or expression, veteran status, or any other protected status under federal, state, or local law.

Apply Now:
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Aurora Labs Remote
🗓  Tue, Jan 21 Blockchain Crypto DEX EVM QA/Testing Rust TypeScript
About Us Aurora Labs is the development company behind Aurora—the EVM blockchain that runs on the NEAR Protocol. We are also the developers of, and integration partner behind, Aurora Cloud—a suite of products that allow Web2 companies to capture the value of Web3. We invite you to be a part of our team of smart, professional, result-oriented and fun individuals. Join us to help ensure that our background processes run smoothly while we are striving to become the best in the industry. Our Values - Execute extreme ownership. - Strive for excellence. - Embrace authenticity. - Promote merit. - Get shit done. About the position We're looking for a web3-nat
About Us 
Aurora Labs is the development company behind Aurora—the EVM blockchain that runs on the NEAR Protocol. We are also the developers of, and integration partner behind, Aurora Cloud—a suite of products that allow Web2 companies to capture the value of Web3.
We invite you to be a part of our team of smart, professional, result-oriented and fun individuals. Join us to help ensure that our background processes run smoothly while we are striving to become the best in the industry.
Our Values
- Execute extreme ownership.
- Strive for excellence.
- Embrace authenticity.
- Promote merit.
- Get shit done. 
About the position
We're looking for a web3-native Senior Software Engineer who wants to work in a fast-paced start-up and is motivated at the prospect of building something new from the ground up, and gets engaged at an early stage of projects.
This position is focused on building blazing-fast agents and SDKs for a cross-chain DEX utilizing multi-party computation, chain signatures, secure enclaves and intent-based architecture. Our goal is to bridge the gaps between EVM and non-EVM chains so a deep understanding of a wide range of blockchain technologies is required.
You will work closely with the Protocol team and external partners to provide the best possible user and developer experience. You will bridge the gap between business requirements and technical implementation, taking an active role on both sides and defining how the application looks as well as how it works. 
Your responsibilities will include
- Creating autonomous agents performing precise financial operations.
- Optimizing every millisecond of user <> agent interactions.
- Implementing deep tracing and observability of data flows.
- Creating the best SDK and reference implementations for external agents to use.
- Designing, testing and implementing the most resilient state machines for managing RFQs.
About you
You are a senior engineer who thrives on solving complex problems with elegant solutions. You have a strong technical background in systems development and optimization, coupled with a deep interest in blockchain technology. You are resourceful, analytical, and committed to delivering high-quality work in a fast-paced, collaborative environment.
Key Qualifications
- Deep expertise in building resilient services in Typescript.
- Successful track-record and proven experience as a backend developer.
- Excellent verbal and written communication skills in English.
Desired skills
- Proven experience in backend development, particularly for high-performance or distributed systems.
- Strong knowledge of algorithms and computational optimization techniques.
- Proficiency in a systems-level programming language such as Rust or Go.
- Familiarity with distributed systems architecture and debugging.

Join our dedicated team of blockchain industry professionals.
Please apply today — we’re standing by for your resume!
In applying at this job, I confirm and acknowledge that I read and understood the Privacy Notice published at https://auroralabs.dev/privacy.

Apply Now:
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