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