Lead Backend Engineer -

Responsibilities

• Lead backend architecture: Own the design and evolution of our backend infrastructure, balancing Firebase today with next-generation stack plans.
• Build scalable APIs: Create efficient, well-structured, backward-compatible APIs optimized for mobile clients.
• Design data models: Build scalable schemas to support rapid product iterations and growth to 10M DAUs.
• Ensure operational excellence: Define SLOs/SLIs, implement monitoring, logging, tracing, alerting, and lead incident response and root-cause analysis.
• Drive security & compliance: Ensure authentication, encryption, and GDPR (and similar regulations) compliance from day one.
• Document & evangelize: Maintain backend architecture documentation and workflows, enabling smooth onboarding and collaboration.
• Collaborate cross-functionally: Partner with mobile and product teams, clearly explaining trade-offs and inviting constructive debate.
• Balance simplicity and scale: Build what's needed today while planning for future growth.
• Maintain CI/CD & IaC: Improve pipelines and Infrastructure as Code practices.
• Contribute to AI & notification features: Support AI-powered and silent push notification flows that enhance mobile experiences.

Qualifications

• Proven experience designing and scaling backend infrastructure for millions of users.
• Hands-on experience building cost-efficient, secure, and reliable systems.

Technical Skills

• Strong JavaScript/TypeScript expertise.
• Experience building and scaling backend infrastructure for large-scale consumer or mobile-first products.
• Hands-on with cloud platforms (preferably GCP) and building scalable services.
• Experience with Firebase (Auth, Firestore, Cloud Functions) is a plus.
• Proficiency in SQL & NoSQL databases and designing scalable data models.
• Experience with CI/CD pipelines & IaC.
• Knowledge of API versioning and backward-compatibility strategies.
• Familiarity with security, privacy, and compliance best practices.

Mindset

• Product-oriented & pragmatic: Focused on delivering user value over over-engineering.
• Strong communicator: Explains trade-offs clearly and invites healthy debate.
• Startup-ready: Adaptable, iterative, and unafraid to rethink what no longer works.
• Data-savvy: Experienced in structuring and managing data at scale.
• Understands mobile client needs and builds APIs that serve them efficiently.
• Reliability-driven: Deep care for operational excellence and measurable performance.

Nice-to-have

• ETL processes, modern data stack tools (Dagster, dbt, Snowflake).
• Experience with AI integrations and silent push notifications.

Why Join l'entreprise?

• Mission-Driven Impact: We are on a mission to help 1Bn people reclaim their time and focus. We've empowered our community to save 150M hours and counting.
• Shape the foundation: Your work will define l'entreprise's backend and accelerate product development. Influence architecture, infrastructure, and operations as we scale to millions of users.
• Collaborative Culture: Work with a small, high-impact team that gathers quarterly for meetups and learning. Nearly $1M in Revenue per Employee.
• Meaningful challenges: Balance simplicity, security, cost, and scale in a product already used by hundreds of thousands.
• Well-Supported: Backed by world-class investors and founders of companies like Pinterest, Snapchat, and Revolut.

Location: EU-based preferred Work Mode: Remote-First, with up to 10 days of travel per quarter to meetups in France or other EU countries. Option to work from our Paris office.