Senior Backend Software Engineer - Paris/Lyon - MicroApps

LumApps SAS; Tassin-la-Demi-Lune; On-site; EUR 90,000 - 130,000; Full time

Job summary

LumApps SAS is seeking a Senior Backend Software Engineer to design, implement and scale our MicroApps platform. You will own back-end features powering MicroApps, contribute to core architecture choices, and enable AI-assisted developer workflows to boost velocity and extensibility.

Join the Work & Automation tribe to deliver an AI-powered Employee Hub that unifies collaboration, communication, and frontline operations across the LumApps platform.

Qualifications

• 5–8+ years of backend experience.
• Experience with API design and databases.
• Familiarity with CI/CD and automated testing.
• Ability to leverage AI tooling in development workflows.

Responsibilities

• Lead backend feature design, implementation, and maintenance.
• Define long-term architectural choices.
• Build high-performance APIs with frontend teams.
• Drive automated testing, code reviews, and process improvements.
• Monitor service health and performance with observability tools.
• Integrate AI workflows and tooling into engineering practices.
• Structure codebase rules and context for AI accuracy.

Skills

Backend architecture

Observability

AI-assisted engineering

Context engineering

AI code auditing

Job description

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.

About the Role

We are looking for a Senior Backend Software Engineer to join our team and play a pivotal role in building and scaling LumApps’ MicroApps platform.

In this role, you will lead the design, implementation, and maintenance of scalable back-end features that power MicroApps—a core product pillar and key success driver for LumApps. You will help define core architectural choices, build high-performance cross-functional APIs, and integrate cutting-edge AI-assisted developer workflows to maximize engineering velocity and product extensibility at scale.

About the Team

You will join the Work & Automation tribe, at the heart of LumApps’ strategy to build an AI-powered Employee Hub bringing together collaboration, communication, and frontline operations into a single extensible platform.

MicroApps are a crucial part of how we deliver extensibility across the full LumApps platform. The team's mission is to provide customers and partners with templated, end-to-end solutions for concrete business use cases. Within this team, your work will focus on:

• Providing a unified UI surface (typically via widgets) and orchestrating complex backend interactions.
• Connecting internal platform services with third-party APIs and AI Agents.
• Combining MicroApps with Workflows, Forms, Tasks, Shifts, and other platform capabilities to deliver configurable, enterprise-grade solutions.

What will you do

• Feature Engineering: Lead the design, implementation, and maintenance of scalable back-end features.
• Architecture Strategy: Participate in core architectural choices and define long-term, sustainable technical solutions.
• Cross-Functional API Design: Build high-performance APIs in close collaboration with web and mobile front-end teams.
• Quality Assurance: Contribute to the automated testing strategy, participate in code reviews, and drive continuous process improvements.
• Observability & Monitoring: Track service health and performance via active monitoring to ensure high availability.
• AI Workflow Integration: Enhance team velocity by integrating modern AI developer tools into everyday engineering practices (prototyping, refactoring, documentation).
• Context Engineering: Structure codebase rules, technical documentation, and context files to maximize AI accuracy across testing, code generation, and API design.

Your Skills

• Core Back-End Expertise: Strong background in back-end architecture, API design, and database management.
• Quality & Observability: Solid experience with automated testing strategies, CI/CD pipelines, and application monitoring tools.
• AI-Assisted Engineering: Proficiency in using modern AI coding assistants and LLMs to accelerate development workflows.
• Context & Prompt Engineering: Ability to format technical context, construct precise prompts, and manage complex context windows for AI tools.
• AI Code Auditing: Critical oversight skills to review, refactor, and secure AI-generated code against security and performance standards.

Your Profile

• Experience: At least 5–8 years