Senior 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'swhywe'relooking for people who arebold enough to think big, authentic in how they lead and collaborate, curious aboutwhat'spossible, 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 Senior Software Engineer designs, develops, and delivers complex features and services within OneStream solutions, leading moderately to highly complex work that drives scalability, performance, and maintainability. This role owns features end-to-end, makes technical decisions within owned areas, and ensures well-designed, backward-compatible APIs and data contracts. The Senior Software Engineer mentors Software Engineers, leads code reviews, collaborates cross-functionally on technical solutions, and is accountable for production quality, reliability, and continuous improvement of engineering practices. Success in this role is measured by reliable delivery of complex functionality, operational excellence, and sustained improvement of engineering quality within their scope.

Primary Duties and Responsibilities

• Design, develop, and maintain complex software features and services within OneStream, including requirements translation, technical design, implementation, validation, deployment, and ongoing production support.
• Lead implementation efforts for moderately to highly complex features, ensuring scalability, performance, maintainability, and reliability.
• Drive technical design discussions and contribute to architectural decisions aligning with platform standards and reference architectures.
• Build and maintain user interface solutions using modern UI frameworks including Angular, React, Blazor, and WPF.
• Make and defend technical decisions within owned areas while aligning with broader architectural standards.
• Ensure JSON and XML data contracts, schemas, and integrations are well designed, documented, and backward compatible.
• Design and evolve APIs, SDKs, and extensibility mechanisms used by internal teams and partners.
• Proactively identify opportunities to improve system performance, reliability, and developer productivity.
• Lead and participate in formal code reviews, act as a trusted reviewer and approver.
• Mentor and support Software Engineers through guidance on design, coding standards, and best practices.
• Collaborate cross-functionally to translate business requirements into technical solutions and proactively identify opportunities to improve system performance, reliability, and developer productivity.
• Contribute to CI/CD improvements, automation, testing strategies, and overall engineering quality initiatives.
• Own complex features and components end to end, including design, implementation, testing, deployment, and ongoing production support.
• Use AI-assisted development tools to accelerate development, refactoring, test creation, and documentation, while critically evaluating and refining AI-generated output to ensure correctness, security, performance, and architectural alignment.
• Partner with peers to diagnose and resolve production issues, ensuring system reliability and performance.

Required Education and Experience

• Bachelor's degree in Computer Science, Engineering, or a related technical field, or equivalent experience.
• 5-8 years of professional software development experience.
• Strong proficiency in C#, .NET, and ASP.NET, and related frameworks.
• Experience building user interfaces with modern UI frameworks including Angular, React, Blazor, and WPF.
• Deep understanding of RESTful API design and service-oriented architectures.
• Strong experience designing, maintaining, and evolving JSON contracts in enterprise applications.
• Experience with performance tuning, memory management, and SQL query optimization.
• Strong experience with Git-based workflows and CI/CD pipelines.
• Experience reviewing unit tests and ensuring adequate test coverage.

Preferred Education and Experience

• Experience building extensible platforms, frameworks, or SDKs.
• Familiarity with SaaS architectures, distributed systems, or multi-tenant applications.
• Experience with deployment automation and DevOps practices.
• Domain experience in financial systems, EPM, or CPM solutions.
• Azure experience and/or relevant Azure certifications.

Knowledge, Skills, and Abilities

• Strong software design and architectural thinking skills.
• Ability to independently own and deliver complex features.
• Proven ability to mentor engineers and influence technical direction.
• Excellent analytical and troubleshooting capabilities.
• Ability to clearly communicate complex technical concepts to diverse technical and non-technical audiences.
• Ability to balance feature delivery with long-term maintainability, scalability, and operational quality.
• Strong sense of ownership, accountability, and continuous improvement.
• Demonstrated ability to effectively and responsibly use AI-assisted development tools, with sound judgment and critical evaluation of outputs.

Travel

• There are no travel expectations for this role.

Benefits at OneStream
OneStream employees are passionate, hardworking individuals who go above and beyond to keep our customers happy and follow through on our mission statement. They consistently deliver the best and in turn, we make every effort to keep them cared for and happy. A sample of the benefits we provide are:

• Excellent Medical Plan
• Dental & Vision Insurance
• Life Insurance
• Short & Long Term Disability
• Vacation Time
• Paid Holidays
• Professional Development
• Retirement Plan

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Total compensation is based on experience, skills, and location using objective, job-related criteria. Additional variable compensation and benefits may apply.

All candidates must be legally authorized to work for any company in the country where this position is located without sponsorship.

OneStream Software is an equal opportunity employer.All qualified applicants will receive consideration for employment without regard to race,color, religion, sex (including pregnancy, sexual orientation, or gender identity), national origin, age, disability, genetic information, veteran status, or any other characteristic protected by applicable local laws, regulations, and ordinances.

If you need assistance and/or a reasonable accommodation during the application process, reach out View email address on click.appcast.io.

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