Senior Full Stack .NET Engineer

Experience: 5+ years Required Skills: C#, .NET, React/Next.js, PostgreSQL, AWS, REST APIs, SQL ServerJob SummaryWe are looking for an experienced Senior Full Stack .NET Engineer to design, develop, and maintain scalable applications for a flagship loan origination, decisioning, and servicing platform. The ideal candidate will have strong expertise in C#/.NET, React-based front-end development, database technologies, and AWS cloud infrastructure, with end-to-end ownership of feature delivery and third-party integrations.Key ResponsibilitiesDesign, develop, and maintain full-stack applications using Next.js, React, C#/.NET, PostgreSQL, and AWS.Build scalable, secure, and high-performance RESTful APIs and backend services.Integrate third-party systems, including credit bureaus, dealer platforms, fraud detection, and identity verification providers.Configure and extend the DEFI Solutions Loan Origination System (LOS), including workflows, business rules, scorecards, and decision flows.Develop integrations with DEFI using REST APIs and Microsoft SQL Server.Deploy and manage containerized applications using AWS ECS/EKS, Fargate, and Docker.Collaborate with Product, Design, and Business teams to deliver features from requirements through production deployment.Ensure code quality, automated testing, performance, security, observability, and system reliability.Participate in code reviews, technical design discussions, and mentoring of team members.Leverage AI-assisted development tools such as GitHub Copilot, Cursor, and Claude Code to improve engineering productivity.Required Skills & Qualifications5+ years of professional software development experience.Strong hands-on expertise in C#, .NET/.NET Core, and modern full-stack application development.Experience with React and Next.js for front-end development.Strong knowledge of PostgreSQL or other relational databases, SQL Server, and T-SQL.Experience designing and integrating RESTful APIs.Hands-on experience with AWS cloud services, containerization, and Docker.Knowledge of CI/CD pipelines, automated testing, application security, and performance optimization.Bachelor’s degree in Computer Science, Engineering, or a related field, or equivalent practical experience.Preferred QualificationsExperience with DEFI Solutions or other Loan Origination Systems (LOS).Domain experience in auto finance, lending, banking, or other regulated industries.Knowledge of event-driven architecture and messaging services such as AWS SNS, SQS, EventBridge, or Kafka.Experience integrating machine learning-based scoring, decisioning, or underwriting models into production applications.Experience with AI-assisted coding and development tools.Must-Have Skills for ScreeningC#/.NET + React/Next.js + AWS + REST APIs + SQL/PostgreSQLGood to Have: DEFI Solutions / Loan Origination Systems, lending or auto-finance domain, Kafka or AWS messaging services.