Senior Full Stack .Net Engineer

Job Summary :

We 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 Responsibilities :

- Design, 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 & Qualifications :

- 5+ 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 Qualifications :

- Experience 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 :

- C#/.NET, React/Next.js, AWS, REST APIs, SQL/PostgreSQL.

Good to Have :

- DEFI Solutions / Loan Origination Systems, lending or auto-finance domain, Kafka or AWS messaging services.

Skills

Full Stack, C#, .Net, React.js, Next.js, PostgreSQL, SQL Server, AWS, RESTful API, Loan Origination System