Senior .NET FullStack Developer (with React or Angular)

At Trinetix we are looking for a Senior .NET FullStack Developer to join our team on a long-term project for a US-based client operating in the Healthcare domain. This project is specialized in agile, community-based healthcare delivery, bridging the gap between massive, crowded trauma centers and basic urgent care clinics. Key Responsibilities: Design, develop, and maintain applications using .NET (C#) in backend and React or Angular in frontend Write and optimize complex SQL Server queries, stored procedures, and database schemas Build and consume RESTful APIs and integrate with third-party systems Develop and support HL7 interfaces for healthcare data exchange between clinical and administrative systems Collaborate with cross-functional teams (product, QA, stakeholders) to translate requirements into tech solutions Deploy and manage applications in Microsoft Azure (App Services, Azure SQL, Azure Functions, etc.) Participate in code reviews, technical planning, and architecture discussions Troubleshoot production issues and implement performance improvements Support claims processing workflows and ensure data integrity across the claims lifecycle Required skills (must): 6+ years of experience in Full Stack Development roles. Strong proficiency in .NET / C# and at least one frontend framework, React or Angular . Solid experience with SQL Server , including query optimization and database design. Hands-on experience with RESTful API development and third-party integrations. Proficient understanding of code versioning tools such as GIT . Experience with healthcare data standards, in specific with HL7 messaging (ADT, ORM, ORU, etc) is a must. Understanding of claims processing concepts (837/835 transactions, adjudication workflows, provider dataflows). Excellent problem-solving skills, attention to detail, and strong communication skills. Nice to have skills: Experience with Microsoft Azure cloud services (deployment, monitoring, DevOps pipelines). Exposure to FHIR or other modern healthcare interoperability standards. Experience working in Agile/Scrum environments. Knowledge of HIPAA compliance and healthcare data security best practices. What we offer: Competitive USD monthly salary Real flexible working hours Continuous learning and career growth opportunities Professional training and English language classes Comprehensive medical insurance Mental health support Specialized benefits program with compensation for fitness activities, hobbies, pet care and more Inclusive and supportive culture About Us: Established in 2011, Trinetix is a dynamic tech service provider supporting enterprise clients around the world. Headquartered in Nashville, Tennessee, we have a global team of over 1,000 professionals and delivery centers across Europe, the United States, and Argentina. We partner with leading global brands, delivering innovative digital solutions across Fintech, Professional Services, Logistics, Healthcare, and Agriculture. Our operations are driven by a strong business vision, a people-first culture, and a commitment to responsible growth. We actively give back to the community through various CSR activities and adhere to international principles for sustainable development and business ethics. To learn more about how we collect, process, and store your personal data, please review our Privacy Notice: https://www.trinetix.com/corporate-policies/privacy-notice