Senior Ruby on Rails Software Engineer (F/M) -...

LumApps is now more than just an Employee Experience Platform — it is an AI-powered Employee Hub that supports companies in their digital transformation of communication, collaboration, and engagement with their customers, partners, and above all their employees.

Our platform is a proven leader in this dynamic market with a truly unique vision and product. It has been deployed by Fortune 500 clients around the world and is delivering meaningful business benefits. LumApps is identified as a leader in Gartner's Magic Quadrant for Intranet Packaged Solutions as well as in Intranets Forrester Wave, and regularly selected for the French Tech Next40/120 program.

✨ In 2025, LumApps strengthened its leadership position by partnering with Beekeeper , a pioneer in frontline employee experience solutions. This strategic collaboration expands our reach and impact across all types of workers — from HQ to the frontline.

Our mission: To make people feel that they belong and have a purpose.

To create an environment where all employees are engaged and work together towards the same goal. Over 700 leading companies trust our solution to:

Improve the productivity of their teams with our AI-powered Collaborative Experience Platform integrated with both Google and Microsoft collaborative suites,

Transform employees into real ambassadors of their company,

Make employees more efficient and better connected to their peers and relevant information, regardless of their location, with the tools and information they need at their fingertips,

Help companies reduce turnover, accelerate employee onboarding, better collaborate and share knowledge, and even improve their customer experiences.

With a team of over 600 Lumies spread across 11 offices (Lyon, Paris, Lille, Sophia Antipolis, London, Barcelona, Hamburg, Austin, Tokyo, Zurich, Krakow), we support large enterprises all around the world. Over the past year, we have been driving an ambitious phase in our journey under the impulse of our new shareholder Bridgepoint, aimed at propelling us to become the clear leader in our market and shine worldwide in our industry. We are looking for individuals who are excited to actively participate in this transformation.

If these core values sound like you: "be bold, do amazing things" , "say what you mean, do what you say" , "one team, same mission" , "always be evolving" : apply now!

*Team* 

As a Ruby on Rails senior developer, you will join our development team.

You will work on our workplace features such as meeting room management and desk booking.

Your work will impact thousands of employees worldwide!

*Missions*

- Backend Engineering: Design, build, and maintain efficient, reusable, and reliable Ruby code within the Ruby on Rails framework.

- Ecosystem Integration: Develop and optimize complex integrations with Google Workspace and Microsoft 365 suites (utilizing Microsoft Graph API, Google APIs, OAuth2 flows).

- Architecture & Scalability: Lead architectural decisions to ensure system performance, security, and scalability as our user base grows.

- Code Quality: Uphold high engineering standards through rigorous testing (RSpec), comprehensive code reviews, ...

- Technical Leadership: Provide mentorship to junior developers and contribute to the continuous improvement of our development processes and documentation.

*Skills*

- Ruby on Rails: 5+ years of professional experience with expert-level knowledge of the framework and its ecosystem (Sidekiq, ActiveRecord, etc.).

- Rust and Python : Experience in Python or/and Rust is a plus.

- Database Management: Strong proficiency in MySQL and Redis, including schema design and query optimization.

- API Expertise: Proven experience in building and consuming RESTful APIs, experience on third-party integrations is a plus (Microsoft or Google Workspace API).

- DevOps: Familiarity with CI/CD pipelines and Git versioning, experience on Google Cloud Platform is a plus.

Why You’ll Love Working at LumApps

We’re proud to offer a work environment where people feel supported, valued, and empowered. Here’s a peek at what we offer:

  Hybrid work model – 2 days at the office, 3 days remote

RTT days – ~10 extra days off per year

Meal vouchers (SWILE) + free snacks & coffee 

‍♀️ Yoga classes  - Take a mindful break in our Paris office

Supportive parental leave and family moments — yes, even a Christmas party for your kids !

️  Health insurance (ALAN) – 60% covered + full life & disability cover

Afterworks, team celebrations & seasonal parties

Equipment of your choice

️ French & English lessons , professional development & access to Leeto CSE

We aim to celebrate diversity and are committed to creating an inclusive environment for all employees. We encourage applications from candidates of all backgrounds, identities, and experiences.