All active Solidity roles based in Japan.
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We are seeking a hands-on Security Engineer who thrives in a startup environment.
You'll work alongside product owners and engineers with the objective to secure the products in Startale's ecosystem. Products include a next-generation decentralized exchange with a fully on-chain order book (Strium), a user-facing application (StartaleApp) and a stablecoin (USDSC). This is a hands-on, technical role. You'll be the person who actively tests our systems, hunts for vulnerabilities, models threats against our products, and works with engineers to close the gaps — not the person who writes policies and generates reports. You'll report to the Security Lead and collaborate daily with Backend, Frontend, DevOps, and Blockchain engineering teams.
Must-have
Strong plus
Domain plus
Decentralized exchanges, DeFi protocols, blockchain security firms, L1/L2 chain security teams, or fintech companies with trading infrastructure. We're also open to strong AppSec engineers from cloud-native startups who have genuine interest in web3.
You're a hands-on security engineer who finds real vulnerabilities, not just runs scanners. You've secured a trading platform or exchange and understand the threats specific to financial infrastructure — order book manipulation, transaction signing, wallet compromise, front-running. You can take a system, map the attack surface, and come back with findings that matter. You write clear reports that engineers act on, and you know the difference between a theoretical risk and a real one. You're comfortable working independently in a fast-moving team where there's no playbook — you write the playbook.
Ready to apply?
Apply to Startale Group
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Summary: We are seeking a skilled Ethereum Developer to join our team in enhancing and optimizing the Ethereum development experience. The role involves implementing EVM-compatible features and optimizing gas usage. The ideal candidate will have a deep understanding of Ethereum internals and Solidity.
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Required Skills:
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Apply to Hyphen Connect Limited
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Summary: Join a dynamic team to enhance a developer-focused protocol that facilitates cross-chain communication. You will play a crucial role in assisting external developers with integration and creating comprehensive technical documentation to streamline their experience.
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Apply to Hyphen Connect Limited
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Summary: Join a premier blockchain security firm trusted by top-tier DeFi protocols as a Blockchain Security Auditor. This role involves conducting manual code reviews to identify critical vulnerabilities, ensuring the security and integrity of cutting-edge blockchain applications.
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Required skills:
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Apply to Hyphen Connect Limited
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Summary: Join a venture-backed Web3 startup at the forefront of innovation, creating next-generation social and financial primitives. As a Senior Software Engineer, you will design and develop core protocol features and secure smart contracts that will drive the future of decentralized technology.
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Apply to Hyphen Connect Limited
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