Software Engineer I

OneStream; Villeneuve-Loubet; On-site; EUR 49,000 - 64,000; Full time

Job summary

OneStream Software Engineer in Villeneuve-Loubet, France will design, develop, test, and maintain software components within the OneStream CPM platform, collaborating with senior engineers, Product, and QA.

You will contribute to UI development with Angular, React, Blazor, and build RESTful APIs while applying SDLC, security, and compliance practices. A Bachelor’s degree and 2–4 years of experience with C#, .NET, and SQL are required.

Qualifications

• Bachelor’s degree in computer science or related field.
• 2–4 years of professional software development experience.
• Experience with C#, .NET, and ASP.NET.
• Experience with UI frameworks such as Angular, React, Blazor, or WPF.
• Familiarity with JSON and XML, SQL, Git, and CI/CD workflows.
• Ability to write and review unit tests.

Responsibilities

• Design, develop, test, and maintain software components within OneStream solutions.
• Implement features using established design patterns and best practices.
• Contribute to UI development using Angular, React, and Blazor.
• Develop and integrate APIs and services following RESTful standards.
• Write clean, maintainable code with appropriate unit test coverage.
• Use peer code reviews to improve code quality and consistency.
• Diagnose, debug, and resolve defects across environments.
• Collaborate with Product, QA, and other engineering team members to deliver features.
• Follow SDLC, security, and compliance protocols.

Skills

C#

.NET

ASP.NET

OO design

Angular

React

Blazor

WPF

JSON

XML

SQL

Git

CI/CD

Unit tests

Education

Bachelor’s degree in Computer Science/Software Engineering

Tools

Git

CI/CD tooling

Azure Fundamentals

Job description

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.

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 of relational databases and SQL fundamentals.

• Experience using source control systems (Git) and participating in CI/CD workflows.

• Ability to write and review unit tests to validate functionality.

PREFERRED EDUCATION AND EXPERIENCE

• Experience building enterprise or platform-oriented applications.

• Familiarity with cloud‑hosted or SaaS‑based systems.

• Introductory experience with automated testing practices.

• Azure Fundamentals or entry-level Azure certification.

• Familiarity with Cursor, Claude Code, etc.

KNOWLEDGE, SKILLS, AND ABILITIES

• Solid understanding of software development fundamentals and object-oriented design.

• Ability to learn new technologies and frameworks quickly.

• Strong problem-solving and debugging skills.

• Effective written and verbal communication skills.

• Ability to work collaboratively in a team-oriented environment.

• Attention to detail and commitment to code quality.

SUPERVISORY RESPONSIBILITIES

There are no supervisory responsibilities required for this role.

TRAVEL

Travel Requirement: Regular travel is not expected for this position

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

Gross annual base salary

€49.000—€64.000 EUR

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 to [e-mail].

OneStream may use the personal information you provide to process your application and contact you,in accordance withapplicable privacy laws such as the CCPA and GDPR. For more information about how we handle your personal information, please review OneStream’s Privacy Policy.

Emails about job opportunities at OneStream are only sent by employees with an @onestreamsoftware.com email address. Reach out to your contact at OneStreamif you suspect a phishingscam.