{"schemaVersion":"jobsearcher.job.v1","id":"b265db358253bdecc2f4b75c","url":"https://jobsearcher.com/jobs/b265db358253bdecc2f4b75c","canonicalUrl":"https://jobsearcher.com/jobs/b265db358253bdecc2f4b75c","title":"Reins - Fullstack Engineer","description":"Reins is building an enterprise stablecoin account that looks and feels like a first-class business bank account, while giving companies the benefits of stablecoin rails and self-custody. Reins makes stablecoins operationally simple for businesses, providing familiar banking features such as ACH, wires (and global equivalents like SEPA), cards, multi-level permissions, approvals, and AML/compliance workflows—combined with stablecoin-native advantages like instant 24/7 global settlement, better control via self-custody, and access to lending, insurance, and exchange markets as DeFi infrastructure matures.\nRole Overview\nYou’ll work directly with founder and CEO Sebastian Delgado (co-founder of Fei Labs), taking ownership of meaningful chunks of backend, full-stack, and security work. The role is flexible:\nFull-stack engineer (preferred)\nBackend engineer\nProduct/frontend contributor (optional)\nFocus areas are prioritized as follows: security & smart contracts, full-stack, backend, and product/frontend. Infrastructure/devops is not a current priority.\nBackend & Integrations\nDesign and build backend services connecting custody, fiat rails, policies, and operational workflows\nImplement and maintain APIs and services for ACH, wires, cards, permissions, AML/compliance workflows, and reporting\nSmart Contracts & Security\nImplement and review Solidity smart contracts, focusing on correctness, safety, and upgradeability\nContribute to threat modeling, security reviews, and audit/vendor management\nProduct & Full-Stack Work\nCollaborate on the design and implementation of customer-facing applications (currently Dart/Flutter)\nTranslate user and operational needs into product and UX decisions, especially around permissions, approvals, and money flows\nSecurity & Audit Participation\nOwn parts of audit/security review processes for your areas of the stack\nCoordinate with external security firms\nBuild internal systems and processes with a security-first mindset appropriate for handling customer funds\nStrong background as a backend or full-stack engineer, ideally in early-stage fintech (Plaid, Brex, Ramp, modern neobanks)\nExperience with crypto infrastructure, wallets, or stablecoin projects\nProficiency in Solidity smart contracts or a willingness to contribute to security-critical logic\nFamiliarity with APIs, integrations, and operational workflows (ACH, wires, cards, permissions, AML/compliance)\nAbility to collaborate on frontend/product work is a plus (Dart/Flutter experience beneficial)\nStrong understanding of security best practices for handling customer funds\nExcellent problem-solving, attention to detail, and autonomy in early-stage environments\nPreferred Backgrounds\nEarly engineers at crypto infra/wallet/stablecoin companies\nStrong backend/full-stack engineers from top fintechs who are crypto-native","company":"Decircle","rawCompany":"decircle","city":"Millbrae","state":"CA","isRemote":false,"isActive":false,"createdAt":"2026-08-09T14:12:52.261Z","occupations":[{"code":"15-1252.00","title":"Software Developers","slug":"software-developers"},{"code":"15-1299.07","title":"Blockchain Engineers","slug":"blockchain-engineers"},{"code":"15-1299.08","title":"Computer Systems Engineers/Architects","slug":"computer-systems-engineers-architects"}],"industries":[{"code":"513210","title":"Software Publishers","slug":"software-publishers"},{"code":"541511","title":"Custom Computer Programming Services","slug":"custom-computer-programming-services"},{"code":"541512","title":"Computer Systems Design Services","slug":"computer-systems-design-services"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"Reins - Fullstack Engineer","description":"Reins is building an enterprise stablecoin account that looks and feels like a first-class business bank account, while giving companies the benefits of stablecoin rails and self-custody. Reins makes stablecoins operationally simple for businesses, providing familiar banking features such as ACH, wires (and global equivalents like SEPA), cards, multi-level permissions, approvals, and AML/compliance workflows—combined with stablecoin-native advantages like instant 24/7 global settlement, better control via self-custody, and access to lending, insurance, and exchange markets as DeFi infrastructure matures.\nRole Overview\nYou’ll work directly with founder and CEO Sebastian Delgado (co-founder of Fei Labs), taking ownership of meaningful chunks of backend, full-stack, and security work. The role is flexible:\nFull-stack engineer (preferred)\nBackend engineer\nProduct/frontend contributor (optional)\nFocus areas are prioritized as follows: security & smart contracts, full-stack, backend, and product/frontend. Infrastructure/devops is not a current priority.\nBackend & Integrations\nDesign and build backend services connecting custody, fiat rails, policies, and operational workflows\nImplement and maintain APIs and services for ACH, wires, cards, permissions, AML/compliance workflows, and reporting\nSmart Contracts & Security\nImplement and review Solidity smart contracts, focusing on correctness, safety, and upgradeability\nContribute to threat modeling, security reviews, and audit/vendor management\nProduct & Full-Stack Work\nCollaborate on the design and implementation of customer-facing applications (currently Dart/Flutter)\nTranslate user and operational needs into product and UX decisions, especially around permissions, approvals, and money flows\nSecurity & Audit Participation\nOwn parts of audit/security review processes for your areas of the stack\nCoordinate with external security firms\nBuild internal systems and processes with a security-first mindset appropriate for handling customer funds\nStrong background as a backend or full-stack engineer, ideally in early-stage fintech (Plaid, Brex, Ramp, modern neobanks)\nExperience with crypto infrastructure, wallets, or stablecoin projects\nProficiency in Solidity smart contracts or a willingness to contribute to security-critical logic\nFamiliarity with APIs, integrations, and operational workflows (ACH, wires, cards, permissions, AML/compliance)\nAbility to collaborate on frontend/product work is a plus (Dart/Flutter experience beneficial)\nStrong understanding of security best practices for handling customer funds\nExcellent problem-solving, attention to detail, and autonomy in early-stage environments\nPreferred Backgrounds\nEarly engineers at crypto infra/wallet/stablecoin companies\nStrong backend/full-stack engineers from top fintechs who are crypto-native","datePosted":"2026-08-09T14:12:52.261Z","dateModified":"2026-08-09T14:12:52.261Z","hiringOrganization":{"@type":"Organization","name":"Decircle","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"Millbrae","addressRegion":"CA","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"b265db358253bdecc2f4b75c"},"url":"https://jobsearcher.com/jobs/b265db358253bdecc2f4b75c"}}