Job Description

WHO YOU ARE: You’re a self-starter and enjoy taking ownership. You can effectively manage tasks, projects and problem-solve. You’re a dynamic engineer who is an effective communicator and enjoys an environment of collaboration. You want to have a big impact.

We're looking for someone who is proficient in Ruby on Rails, If the individual has experience in Rails as well, that would be great but not necessary,

YOUR DAY-TO-DAY: As a Backend Rails Engineer, you’ll be developing our core product, reporting to the Head of Engineering and working alongside our engineering and product teams.

Qualifications

Technical Requirements:

Mid-range to Senior Experience of professional full-stack web development.
Solid understanding of the Ruby programming language and Rails framework.
Solid understanding in Javascript including experience with React
Solid understanding of RESTful systems and the principles of good API design
Understanding of Postgres or equivalent
Previous experience maintaining production applications.
Focus on writing clear, maintainable, tested code.
Experience with Git, continuous integration and regular deployments.
Excellent written communication skills and diligent ability to contribute to the team by performing code reviews.

Additional Information

If this sounds like you (and even if you don't think you meet 100% of the requirements), we’d love to hear from you.

You’ll be joining an exceptionally talented and motivated team, helping us drive demand for the Five to Nine platform. We are creating massive value for our customers and we’re just getting started!

This position is remote.

All your information will be kept confidential according to EEO guidelines.

About the company

Five to Nine offers a corporate event management platform that helps organizations plan, manage, and evaluate workplace events and programs. It focuses on ERGs and uses engagement analytics and custom surveys to measure participation and program impact. The product works by enabling users to create and manage events, collect survey feedback and engagement data, and generate actionable insights from that data. It integrates with Slack, Google Calendar, Outlook, and HRIS systems to streamline workflows and reduce “tool fatigue,” with a subscription-based model that provides access to core features and premium options. Differentiators include a specific emphasis on ERGs, detailed engagement analytics, and seamless integrations, which together help improve participation and program effectiveness. The overall goal is to boost employee involvement and the effectiveness of workplace programs through data-driven insights and easier event management.

Company Size

1-10

Company Stage

Seed

Total Funding

$5.5M

Headquarters

Chicago, Illinois

Founded

2018

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Simplify's Take

What believers are saying

Five to Nine’s site was updated August 2, 2026, signaling active product maintenance.
Its integrations with Okta, Google SSO, Outlook, Zoom, and HRIS reduce switching friction.
Customer pages updated September 19, 2025, highlight continued use across global offices.

What critics are saying

ERG and DEI software faces direct budget cuts during 2025 board reviews.
Five to Nine still shows limited public traction beyond testimonials and case-study pages.
If employers keep centralizing event tooling, Five to Nine becomes a feature, not a company.

What makes Five to Nine unique

Five to Nine unifies ERG events, surveys, calendars, Slack, and HRIS workflows.
Its platform sells program impact through engagement analytics, helping leaders justify budgets.
Customers like Webflow, Amplitude, Yahoo, Upwork, and Nitro validate enterprise relevance.

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