{"id":2519380,"url":"https://alion.io/job/viseo-iberia-senior-backend-developer-blockchain-experience-viseo","title":"Senior Backend Developer (Blockchain Experience) - VISEO","company":{"id":6163,"name":"VISEO","domain":"viseo.com","url":"https://alion.io/company/viseo-iberia","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"JazzHR","truth_index":null},"role":"Web3","role_family":"Web3","seniority":"senior","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Vietnam"],"countries":["VN"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":26000,"max_usd":45000,"period":"year","method":"global_role_cell_scaled_by_country","sample_n":37},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Angular","optional":false},{"name":"DeFi","optional":false},{"name":"Ethereum","optional":false},{"name":"Hyperledger Fabric","optional":false},{"name":"Java","optional":false},{"name":"Node JS","optional":false},{"name":"Polygon","optional":false},{"name":"React.js","optional":false},{"name":"Smart Contracts","optional":false},{"name":"Solana","optional":false},{"name":"TypeScript","optional":false},{"name":"Apache Kafka","optional":true},{"name":"Ethers.js","optional":true},{"name":"GDPR","optional":true},{"name":"GraphQL","optional":true},{"name":"JavaScript","optional":true},{"name":"MySQL","optional":true},{"name":"PostgreSQL","optional":true},{"name":"Web3.js","optional":true}],"status":"live","first_seen_at":"2026-10-14T10:34:00Z","employer_posted_date":"2026-10-14","last_verified_at":"2026-10-30T23:16:50Z","board_verified":true,"closed_at":null,"days_open":16,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":16},"description":"We are seeking a highly skilled Java & TypeScript Blockchain Developer to design, develop, and maintain enterprise-grade blockchain applications and distributed systems. The ideal candidate will have strong expertise in Java, TypeScript, API development, cloud technologies, and blockchain platforms, with the ability to build secure, scalable, and high-performance solutions.\nResponsibilities\nDesign, develop, and maintain blockchain-based applications using Java, TypeScript, and modern frameworks.\nDevelop and integrate smart contracts on blockchain platforms such as Ethereum, Hyperledger Fabric, Polygon, Solana, or other enterprise blockchain networks.\nBuild and maintain RESTful APIs, microservices, and backend systems supporting blockchain transactions and integrations.\nDevelop frontend applications using TypeScript, Angular, React, or Node.js to interact with blockchain networks.\nIntegrate blockchain solutions with enterprise systems, databases, and external platforms.\nImplement secure transaction processing, digital signatures, wallet integrations, and tokenization solutions.\nParticipate in architecture discussions and contribute to blockchain solution design.\nOptimize application performance, scalability, security, and reliability.\nCollaborate with cross-functional teams including architects, business analysts, DevOps engineers, and product owners.\nPerform code reviews, testing, troubleshooting, and production support activities.\nProfile\nBachelor's degree in Computer Science, Information Technology, or related field.\nExperience in Banking, Financial Services, FinTech, Digital Assets, or Web3 projects.\nKnowledge of blockchain security, governance, and compliance frameworks.\nUnderstanding of DeFi, NFTs, CBDC, tokenisation, or digital asset platforms.\nBlockchain certifications (Hyperledger, Ethereum, ConsenSys, etc.) are advantageous.\nNice to Have\nKafka or messaging platforms\nGraphQL\nMongoDB, PostgreSQL, MySQL\nWeb3.js, Ethers.js\nBlockchain interoperability frameworks\nExperience with enterprise blockchain solution architecture\nGDPR MESSAGE: Our privacy policy has been updated to comply with the new regulations. We invite you to consult it by clicking here: https://www.viseo.com/fr/politique-de-confidentialite. The VISEO Group uses the data collected as part of your application to assess your suitability for the job in question. We use the Jazz HR tool to help us in our recruitment process. This tool complies with current regulations on the protection of personal data. The tool is hosted in the United States and is PrivacyShield certified for HR data. In all cases, we may keep your file for 5 years so that we can contact you again if another position matches your profile. You may, of course, object to this. 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