Senior Fullstack Engineer

Sr. Fullstack Engineer Nashville, TN, or Santa Rosa Beach, FL Resumes must be submitted in English No third-party recruiters, please! ONLY local candidates will be considered for this role OMNICOMMANDER, Inc. is the fastest-growing startup in the financial technology space. We have been named an Inc. 5000 company for three consecutive years. We pride ourselves on our upbeat, high-tech, and supportive culture. We are a global company with offices in the United States and Latin America. OMNICOMMANDER is the industry leader in digital branches and marketing, along with providing a comprehensive suite of digital solutions for financial institutions (FIs). For the first time, FIs can partner with a single company to create, host, and manage their Digital Branch within one complete ecosystem. This is an on-site, in-office position located in Brentwood, TN, or Santa Rosa Beach, FL. We are hiring a hands-on Senior Full-stack Engineer to own customer-facing features from accessible React and TypeScript interfaces through C#/.NET web APIs and PostgreSQL data. You will work with AWS-hosted applications, translate complex product needs into secure and maintainable solutions, collaborate with Product, Design, and QA, and help our engineering team deliver reliably. This role will report to the Software Engineering Manager. Why You’ll Love Working Here Be part of a fast-growing fintech company with a fun, supportive culture. Work in a dynamic, high-tech environment with hands-on experience working with AI. Global team with offices in Tennessee, Florida, and Bogotá, Colombia. Key Responsibilities Design and build accessible, responsive React and TypeScript interfaces with reusable components, clear interactions, and consistent design patterns. Own features end-to-end, connecting frontend behavior and state management to API contracts, business logic, and PostgreSQL data. Develop and maintain secure C#/.NET web APIs with thoughtful data models, validation, performance considerations, and reliable changes. Apply modern frontend tooling, maintainable application architecture, and shared design systems to deliver scalable, intuitive experiences. Follow secure development practices including strong authentication, authorization, data protection, and safe handling of untrusted input. Build and support AWS cloud-native solutions using containerization, serverless approaches, and modern CI/CD practices. Write automated frontend, backend, and integration tests; review code, document decisions, and help deliver safe, repeatable releases. Partner with Product, Design, and QA to improve complex workflows, browser performance, responsive layouts, and accessibility aligned with WCAG 2.2 AA. Investigate and resolve production issues across the UI, API, and data layers; mentor teammates and contribute to secure SDLC practices and SOC 2 readiness. What We Are Looking For Senior-level engineering experience, typically 8+ years or equivalent demonstrated expertise, delivering and maintaining production SaaS applications. Strong React and TypeScript experience, including component architecture, application state, navigation, API integration, and performance. Hands-on C#/.NET experience building and supporting maintainable production APIs and backend services. Strong PostgreSQL and SQL fundamentals, including schema design, migrations, transactions, query optimization, and data integrity. Experience building secure SaaS software using authentication, authorization, data protection, and appropriate separation of customer data. Demonstrated automated testing across the stack, code reviews, CI/CD practices, AWS deployments, and production troubleshooting. Ability to weigh end-to-end technical tradeoffs, communicate clearly in English (B2+), work well across teams, and mentor other engineers. Experience working with modern state management approaches, accessible component libraries, UI testing, and performance or accessibility auditing is a plus. Experience with Data-rich dashboards, advanced tables and forms, real-time user experiences, visual editors, or content-management workflows is a plus. Experience with Python or Rust for supporting services; Amazon Bedrock, AI integrations, or vector search is a plus. Experience with infrastructure as code, background and event-driven processing, observability, caching, or cloud reliability improvements is a plus. Fintech or enterprise SaaS experience, SOC 2-related engineering practices, AI-enabled features, or additional programming languages are highly desirable for this role. Benefits: (waiting period may apply) Company Paid Holidays PTO Days (Paid Time Off) PTO Day for your birthday Medical Insurance Dental & Vision Insurance Company-paid life insurance 401(k) Job Type: Full-time A criminal background check is required. US work authorization is required.