Senior Software Engineer III

OneStream • Full-time • United States • 1m ago

Why This Job is Featured on The SaaS Jobs

This Senior Software Engineer III role stands out in SaaS because it sits at the intersection of product experience and platform ecosystem. The work centers on web applications that underpin a solution marketplace and partner-driven distribution model, a common pattern in mature B2B SaaS where extensibility and integrations become core to the product. The emphasis on secure identity, entitlements, and self-service deployment signals a platform-oriented environment rather than a single application codebase.

From a SaaS career perspective, the remit touches several durable competencies: designing scalable frontend and full-stack architecture, building telemetry into customer-facing surfaces, and partnering across Product, UX, Security, and DevOps to ship and operate features. Exposure to marketplace workflows, search and discovery, and analytics-informed iteration maps closely to how SaaS teams improve activation and ongoing usage over time. The leadership component also supports progression toward staff-level scope through standards-setting and mentoring.

The role is best suited to an experienced engineer who enjoys balancing hands-on delivery with architectural stewardship and cross-team influence. It will fit someone who prefers building foundational capabilities that other teams and external partners rely on, and who is comfortable owning quality, performance, and security outcomes across multiple web applications.

The section above is editorial commentary from The SaaS Jobs, provided to help SaaS professionals understand the role in a broader industry context.

Job Description

Senior Software Engineer III

Location: Remote, USA

Compensation: $158,000-$198,000

Benefits Offered: Vision, Medical, Life, Dental, 401K (Range applies to US candidates only) + Benefits/Variable Comp/Equity - Range may vary based on experience.

Employment Type: Full-Time

Summary

The Senior Software Engineer III on the Solution Network team is a strategic, big‑picture technical leader responsible for architecting and delivering modern, scalable, customer‑focused web applications that power OneStream’s Solution Exchange ecosystem. This role blends deep hands-on engineering expertise with cross-functional leadership across Product, UX, Platform Engineering, Security, and DevOps teams. You will drive the technical vision for multiple custom web applications, ensuring they are performant, secure, intuitive, and aligned to OneStream’s long-term Platform strategy. This includes leading complex architectural initiatives, mentoring engineers, promoting best practices, and building high‑quality experiences that enable self-service solution deployment, intelligent search, and seamless integration with the OneStream Platform.

Primary Duties and Responsibilities

Architect, design, and build enterprise‑grade web applications using modern frameworks such as React/Next.js, TypeScript, Tailwind CSS, and associated tooling.
Establish and drive frontend and full-stack architecture standards, ensuring scalability, maintainability, accessibility, and security across Solution Network applications.
Lead and mentor engineers by setting coding standards, running design reviews, facilitating code reviews, and elevating engineering best practices across the team.
Integrate with authentication, entitlement, and workflow systems such as Okta, ServiceNow, and internal OneStream services for secure, seamless user experiences.
Develop and maintain structured content integrations (e.g., Sanity CMS) to support dynamic metadata, marketplace assets, and partner-driven content.
Design and implement intelligent search, filtering, and recommendation features leveraging LLM-driven capabilities and advanced UI/UX patterns.
Collaborate closely with backend and Platform teams to define API contracts, data models, and telemetry/reporting standards.
Implement observability and analytics frameworks (Clarity, Google Analytics, Dynatrace, Power BI) to monitor performance and guide product decisions.
Champion CI/CD, testing automation, and DevOps practices using Azure DevOps, GitHub Actions, and Vercel.
Conduct technical evaluations and proof‑of‑concepts for emerging technologies and architectural approaches.
Troubleshoot, debug, and optimize existing applications to improve reliability, performance, and security.
Drive requirements discussions with Product and UX teams, prioritizing based on customer value, technical feasibility, and strategic impact.
Document system architecture, standards, and development workflows; contribute to internal knowledge bases and engineering enablement efforts.
Support solution submission automation, partner self‑service portal initiatives, and future in‑app solution consumption models within the Solution Exchange roadmap.

Required Education and Experience

Bachelor’s degree in Computer Science, Software Engineering, or related technical field.
10+ years of professional software engineering experience, with significant front-end or full-stack expertise.
Proven experience building production-grade web applications using React/Next.js, TypeScript, and modern component-driven architectures.
Deep knowledge of authentication and authorization technologies (OAuth, OpenID Connect, Okta) and secure session management.
Experience integrating RESTful APIs and working with cloud-hosted infrastructure (Azure, Vercel).
Demonstrated proficiency with automated testing, code scanning, CI/CD workflows, and release engineering.
Strong understanding of web analytics, telemetry, performance optimization, and observability tooling.

Preferred Education and Experience

Master’s degree in Computer Science or related field.
Experience with enterprise SaaS platforms, especially in finance or B2B marketplaces.
Prior work with ServiceNow APIs, Azure Functions, and advanced entitlement management.
Exposure to AI-driven search, personalization, and recommendation systems.
Experience with partner portals, eCommerce, and solution lifecycle automation.

Knowledge, Skills, and Abilities

Expert-level proficiency in modern JavaScript/TypeScript, React, Next.js, HTML/CSS, and responsive design principles.
Strong problem-solving, debugging, and analytical skills.
Ability to collaborate effectively with technical and non-technical stakeholders across multiple disciplines.
Deep understanding of secure web development, accessibility standards, and performance best practices.
Experience with cloud deployment, CI/CD pipelines, and DevOps automation.
Strong communication, documentation, and leadership skills with a commitment to mentoring others.
Ability to prioritize effectively in a fast-paced, deadline-driven environment.
Commitment to continuous learning, mentorship, and fostering a psychologically safe, innovative team environment.
Excellent organizational skills and ability to prioritize in a fast-paced, deadline-driven environment.

Travel

Regular travel is not required for this position but may be required from time-to-time as business dictates.

Who We Are

OneStream is how today’s Finance teams can go beyond just reporting on the past and Take Finance Further™ by steering the business to the future. It’s the only enterprise finance platform that unifies financial and operational data, embeds AI for better decisions and productivity, and empowers the CFO to become a critical driver of business strategy and execution. Our vision is to be the operating system for modern finance, digitizing core financial functions and empowering the CFO to become a critical driver of business strategy. To learn more visit www.onestream.com.

Why Join The OneStream Team

Transparency around corporate structure, salary, and benefits.
Core value of customer success.
Variety of project work (not industry-specific).
Strong culture and camaraderie.
Multiple training opportunities.

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: