{"id":2406006,"url":"https://alion.io/job/syone-fullstack-developer-net-react","title":"Fullstack Developer .NET & React","company":{"id":2555720,"name":"Syone","domain":"syone.com","url":"https://alion.io/company/syone","size_band":"51-200","is_staffing_agency":false,"employer_type":"services","is_intermediary":false,"listed_via":null,"ats_vendor":"Deel","truth_index":{"grade":"B","score":75,"open_postings":5,"ghost_share":0,"stale_share":1,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-16T05:45:00Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Lisbon, Portugal"],"countries":["PT"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":40000,"max_usd":87000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":36},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":".NET","optional":false},{"name":"Azure","optional":false},{"name":"React.js","optional":false},{"name":"C#","optional":true},{"name":"CI/CD","optional":true},{"name":"GDPR","optional":true},{"name":"JavaScript","optional":true}],"status":"live","first_seen_at":"2026-09-18T09:11:27Z","employer_posted_date":"2026-09-18","last_verified_at":"2026-10-17T03:15:10Z","board_verified":true,"closed_at":null,"days_open":28,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":28},"description":"We are looking for a Fullstack Developer with strong expertise in .NET and React to design, develop, and maintain scalable web applications in an Azure Cloud environment.\nWhat You Will Do:\nDesign, develop, and maintain fullstack applications using .NET and React.\n\nBuild robust backend services and APIs and ensure seamless integration with frontend applications.\n\nDevelop scalable, maintainable, and high-quality software solutions.\n\nDeploy, manage, and optimize applications and services in Microsoft Azure.\n\nParticipate in the full software development lifecycle, from requirements analysis and solution design to development, testing, deployment, and maintenance.\n\nCollaborate closely with developers, architects, QA, and business stakeholders.\n\nContribute to technical decisions and continuously identify opportunities to improve application architecture, performance, and development practices.\n\nWork with different technologies and adapt to new tools and frameworks according to project needs.\n\nWhat You Need to Bring:\nAt least 5 years of professional experience in software development, with proven experience in fullstack roles.\n\nStrong hands-on experience with .NET for backend development.\n\nStrong experience with React and modern frontend development.\n\nProven ability to design, develop, and maintain complex web applications with effective integration between frontend and backend systems.\n\nHands-on experience with Microsoft Azure, including deploying, managing, and optimizing cloud-based applications.\n\nGood understanding of cloud architectures, scalability, performance, and application lifecycle management.\n\nExperience working with different technologies and the ability to quickly learn and adopt new tools and technology stacks.\n\nBachelor’s degree in Engineering, Information Technology, Computer Science, or a related field.\n\nGood communication and collaboration skills.\n\nAvailability to work in a hybrid model in Lisbon.\n\nNice to Have:\nPrevious experience or knowledge of the healthcare plans/health insurance industry.\n\nExperience working with additional frontend, backend, cloud, or DevOps technologies.\n\nExperience in complex enterprise environments.\n\nKnowledge of CI/CD practices and modern software development methodologies.\n\nWhat Can Syone Offer Me:\nIntegration in an organization with profound and sustained growth and involvement in pioneering projects with innovative technological solutions;\n\nStrong IT training plans;\n\nProfessional evolution with intervention in ambitious technological projects, both national and internationally.\n\nBy applying, you accept our GDPR policies. Your personal data in your CV and documents will be used solely for processing your application at SYONE, S.A. (NIPC 504729624). We are located at Rua Alfredo da Silva, 8-A, Edifício Stern, Piso 3D, 2610-016 Amadora.\nYour data will be used to tailor your application to relevant vacancies and for potential employment contracts. If selected, your data will be kept during your employment and for at least two years after. If not selected, your data will be kept for two years for future vacancies and then deleted, except for your contact details.\nYou can exercise your rights (access, rectification, erasure, etc.) by emailing . Your data may be shared with HR service providers and will be stored securely. Consent may be withdrawn at any time. 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