Software Engineer I

At OneStream, we're on a mission to empower every Finance organization and professional to exceed their potential. Our global teams span continents, cultures, and time zones, united by a shared purpose as we build the operating system for modern Finance and help organizations move with greater speed, clarity, and confidence. That mission comes to life through our people. Behind every innovation, customer success, and milestone are talented people working together to make a difference. That's why we're looking for people who are bold enough to think big, authentic in how they lead and collaborate, curious about what's possible, and committed to delivering results. Want a closer look before you apply? Explore our Careers site to learn more about our people, culture, and benefits. SUMMARY OneStream Software delivers a unified Corporate Performance Management (CPM) platform designed to meet the complex financial, operational, and analytical needs of large enterprises. OneStream operates at enterprise scale, supporting mission-critical workloads for the Office of the CFO across highly regulated industries. The OneStream platform is built on a sophisticated technology stack that includes distributed, multi-threaded services, OLAP and multidimensional data models, modern web frameworks, SQL-based persistence, and increasingly cloud-native, SaaS-oriented architecture on Microsoft Azure. The Software Engineer designs, develops, tests, and maintains software components within OneStream, building high-quality features using established design patterns and best practices. This role owns assigned features through the full software development lifecycle, collaborates with senior engineers, Product, and Quality Assurance, and develops user interfaces, APIs, and data access logic. The Software Engineer participates in code reviews and assists in diagnosing and resolving defects and production issues to ensure reliable, high-performing solutions and positive customer experience. Success in this role is measured by code quality, reliability, learning velocity, and the ability to deliver well ‑ scoped features safely and predictably. PRIMARY DUTIES AND RESPONSIBILITIES • Design, develop, test, and maintain high-quality software components within OneStream solutions. • Implement features using established design patterns and best practices under guidance from senior engineers. • Contribute to UI development using modern UI frameworks including Angular, React, and Blazor. • Develop and integrate APIs and services following RESTful standards and practices. • Write clean, maintainable, and well-documented code with appropriate unit test coverage. • Use AI-assisted development tools to accelerate development, refactoring, test creation, and documentation, while validating AI-generated output for correctness, security, and architectural alignment. • Participate in peer code reviews to improve code quality and consistency. • Assist in diagnosing, debugging, and resolving software defects across development and test environments. • Collaborate with Product, QA, and other engineering team members to deliver features that meet functional and quality expectations. • Follow established SDLC, security, and compliance protocols REQUIRED EDUCATION AND EXPERIENCE • Bachelor’s degree in Computer Science, Software Engineering, or a related technical field, or equivalent practical experience. • 2–4 years of professional software development experience. • Experience with object-oriented programming and the Microsoft technology stack, including C#, .NET, and ASP.NET. • Basic experience with modern UI frameworks such as Angular, React, Blazor, and WPF. • Familiarity with data formats and markup languages such as JSON and XML. • Working knowledge o