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