Senior .NET Full Stack Engineer with React at Nix

We are looking for a Senior .NET FullStack Engineer with React (Azure) to join our team! Our client is a precision mental health company on a mission to make high-quality, evidence-based digital mental health support accessible at scale. Their platform transforms deep clinical expertise into trusted, personalized, and measurable digital experiences that help people improve their mental well-being. Working with digital health partner companies across the US, they combine AI, rigorous clinical science, and human-centered design to deliver meaningful real-world outcomes. Project technical stack: • Backend: .NET/C#, REST APIs, Auth0, third-party integrations • Frontend: TypeScript, React, react-query, react-hook-form, tailwind, lottie (animation), jest, testing-libraty/react • Cloud: Azure • Data & Storage: Azure SQL, Cosmos DB, Blob Storage, Azure Storage • DevOps, Infrastructure & CI/CD: GitHub, Azure Pipelines, Docker, Kubernetes, Terraform, Grafana Responsibilities: • Design, develop, test, document, and maintain solutions across backend and frontend • Deliver new features end-to-end with strong ownership and accountability, while maintaining and improving existing solutions • Build secure, scalable, reliable, high-quality, and high-performance applications • Work effectively in a cross-functional team, collaborating closely with Product, QA, DevOps, Data, AI, and Engineering stakeholders • Communicate confidently in a multinational environment with business, engineering, marketing, and clinical stakeholders when needed • Actively apply AI-assisted approaches across solution design, coding, testing, debugging, and delivery workflows • Participate fully in Agile/Scrum ceremonies • Troubleshoot complex issues, perform root-cause analysis, and investigate new tools and approaches • Contribute to technical decisions, architecture discussions, and engineering best practices Requirements: • 5+ years of professional software engineering experience • Strong commercial experience with .NET/C# • Strong commercial experience with React/TypeScript • Proven full-stack delivery experience across frontend and backend systems • Strong experience building and consuming REST APIs • Solid production experience with Microsoft Azure • Solid understanding of SOLID principles, design patterns, and microservices architecture • Strong understanding of version control, security best practices, and Agile methodologies • Strong Agile delivery experience with a focus on speed and quality • Startup mindset: adaptable, fast-moving, pragmatic • Result-oriented mindset with ownership mentality • Excellent communication and collaboration skills, able to lead conversations and drive alignment • Able to work independently and as part of a team • Proactive, responsive, and dependable with a strong ownership mindset Nice to have • Experience in healthcare, mental health, or other regulated industries • Experience building AI-powered product features • Practical experience using Anthropic Claude Code to improve SDLC • Testing and test automation experience • Python experience • Data engineering experience • Strong DevOps & CI/CD practices We offer*: • Flexible working format - remote, office-based or flexible • A competitive salary and good compensation package • Personalized career growth • Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more) • Active tech communities with regular knowledge sharing • Education reimbursement • Memorable anniversary presents • Corporate events and team buildings • Other location-specific benefits *not applicable for freelancers