Senior Full Stack Software Engineer, Wellfit Plans at Wellfit

About Wellfit At Wellfit, we’re reimagining how treatment planning and benefit eligibility power the future of patient care. Our Plans portfolio enables providers to configure, manage, and deliver personalized treatment plans that align with payor rules, patient needs, pricing logic, and financial transparency. As our platform scales, we’re expanding our engineering organization to strengthen backend architecture, improve system flexibility, and support the complex rules and integrations that power our provider and patient experiences. Position Overview:As a Backend-Focused Full Stack Software Engineer on the Plans team, you’ll play a key role in building and evolving the services, APIs, integrations, and business logic that drive treatment planning, plan configuration, pricing, and eligibility workflows. This role is primarily backend-focused, with hands-on ownership across ASP.NET, C#, .NET Framework/.NET Core, SQL, APIs, integrations, and microservices. You may contribute to front-end work when needed, but the primary emphasis is designing scalable backend systems that support complex healthcare and fintech workflows. You’ll collaborate closely with Product, Architecture, DevOps, and front-end engineering partners to deliver reliable, maintainable, and high-impact solutions that transform how care plans are created, priced, configured, and delivered. Key Responsibilities:• Design, develop, and maintain backend services, APIs, and data-driven applications for the Plans portfolio, including treatment planning, provider plan configuration, pricing logic, and eligibility workflows. • Build and integrate with third-party systems such as Sika, Next Health, payor platforms, and other healthcare/benefit data sources to support seamless exchange of eligibility, pricing, and plan data. • Translate complex business rules around plan configuration, benefit eligibility, pricing, provider customization, and patient responsibility into scalable backend services and domain logic. • Develop and optimize APIs, service layers, database queries, stored procedures, and data models that support configurable plan templates and rules-based workflows. • Partner with Product Owners, Business Analysts, and Architecture to clarify requirements, identify edge cases, and ensure backend solutions are accurate, scalable, and maintainable. • Contribute to the evolution of microservices-based architecture, API-first design, domain-driven design practices, and clean separation of business logic. • Work with DevOps to support CI/CD pipelines, test environments, automated deployments, logging, monitoring, and production reliability. • Implement software engineering best practices including clean architecture, TDD/BDD where appropriate, code reviews, automated testing, and strong documentation. • Troubleshoot, optimize, and refactor backend systems for performance, reliability, maintainability, and long-term scalability. • Collaborate with front-end engineers to ensure APIs and backend services effectively support intuitive, performant user experiences. Qualifications • Bachelor’s degree in Computer Science, Engineering, or a related field. • 5–7 years of professional software engineering experience with a strong backend development focus. • Strong hands-on experience with C#, ASP.NET, .NET Framework and/or .NET Core. • Strong SQL experience, including database design, query optimization, stored procedures, and working with relational databases. • Experience designing, building, and consuming RESTful APIs and service-oriented/microservices architectures. • Experience with cloud platforms such as Azure, AWS, or GCP. • Familiarity with DevOps practices, CI/CD pipelines, automated deployments, and production support. • Working knowledge of front-end frameworks such as Angular, React, or Vue is preferred, but this role is not primarily front-end focused. • Experience with healthcare systems, eligibility, benefits configuration, payor data, pricing logic, or financial workflows is a strong plus. • Exposure to Domain Driven Design, API-first architecture, event-driven systems, or distributed services is preferred. Ideal Candidate Profile • Backend-first engineer who enjoys solving complex business logic and systems problems. • Strong understanding of APIs, data flow, integration patterns, and service architecture. • Comfortable working through ambiguity in complex domains such as healthcare, fintech, eligibility, pricing, and plan configuration. • Analytical, detail-oriented, and able to balance scalable architecture with practical delivery. • Strong communicator who can work effectively with Product, Architecture, DevOps, QA, and front-end partners. • Passionate about writing clean, maintainable, testable code that supports measurable business and patient impact. • Self-motivated, technically curious, and comfortable operating in a fast-growing, product-driven environment. Why Wellfit• Shape the Future of Care: Build the backend systems that redefine how providers deliver treatment plans and patients understand their benefits. • Work on Meaningful Complexity: Own services, APIs, integrations, data flows, and rules-based workflows across healthcare and fintech systems. • Collaborate in a Hybrid Model: 3 days onsite in Dallas, 2 days remote. • Comprehensive Benefits: Medical, dental, vision, and generous PTO. • Invest in Your Future: Competitive salary, 401(k) matching, and performance-based bonuses. • Be Part of a Growth Story: Join a profitable, fast-scaling fintech company making healthcare more transparent and accessible.