Full Stack Developer (Backend/.NET)

Full Stack Developer (Backend/.NET) Millennium is seeking a skilled Full Stack Developer (Backend/.NET) to build and support complex inbound and outbound integrations across corporate accounting, partnership accounting, and financial systems. The ideal candidate brings strong backend engineering expertise, with a primary focus on .NET technologies, and the ability to design resilient, scalable systems in a fast-paced, mission-critical environment. Principal Responsibilities 5+ year of experience in designing, develop, and maintain robust backend services, APIs, and enterprise integrations using .NET (C#) Build and support applications and data interfaces using SQL Server and PostgreSQL Work with business and IT stakeholders to gather, interpret, and implement requirements Develop and maintain RESTful APIs and SOAP services to support financial close processes and accounting operations Execute the full Software Development Life Cycle (SDLC) Deploy and manage containerized workloads using Kubernetes Support event-driven architecture and messaging pipelines using Kafka Produce technical specifications and assess operational feasibility Integrate backend software components into fully functional enterprise systems Develop software verification plans and QA procedures Troubleshoot, debug, and enhance existing backend systems Ensure compliance with engineering standards and industry best practices Collaborate with frontend developers and cross-functional teams to deliver end-to-end solutions Help mentor junior developers and contribute to team best practices Skills Desired Strong development experience in .NET (C#) and understanding of python. Experience building backend services, APIs, and enterprise applications using modern .NET (C#) Strong experience designing and managing UI applications using Angular Strong experience with Microsoft SQL Server and PostgreSQL, including complex SQL queries and stored procedures Experience with REST APIs and SOAP services Experience with GitHub, Jenkins, and JIRA Understanding of Lean/Agile and DevOps principles Strong written and verbal communication skills Ability to work effectively with senior stakeholders and cross-functional technology teams Ability to document technical requirements and specifications Proficiency with software engineering tools and development best practices Understanding of ML model integration and API-based AI service consumption Hands-on experience with AI coding assistants