Location: Paris or 100% Remote Work [2 days a month in Paris]

Salary: €60,000 - €80,000 gross per year  (English proficiency required)

Why is this opportunity unique for a Senior Engineer?

• 🏗️ Architect & Build Core Foundations: Take a leading role in designing and developing essential SaaS frameworks (data views, statuses, email campaigns, notification center, settings, DB monitoring) that require deep technical thought and will underpin future product development.

• 🤖 Implement Cutting-Edge AI: Dive deep into integrating AI into our key features (AI-assisted newsletter creation, intelligent search, social recommendations, etc.), solving challenging technical problems related to LLM integration and performance.

• 💡 Shape AI Engineering Practices: Contribute your expertise to defining and implementing best practices for LLM engineering (e.g., Test-Driven AI coding, prompt engineering standards, framework evaluation), influencing how we build with AI.

• 📈 Deliver Complex SaaS Projects: Own the technical design and implementation of major features like email sequence management, advanced notification systems, audience management, and complex analytical dashboards, ensuring high performance and reliability (99.9% SLA).

• ✨ Solve Tough Modernization Challenges: Apply your deep technical skills to refactor legacy components (Sharepoint SPFX) effectively and contribute significantly to the overall robustness and architectural integrity of the platform.

🛠️ Your Main Responsibilities:

• Design, develop, test, deploy, and maintain complex features and core systems for the Mozzaik platform.

• Contribute significantly to the technical architecture and design decisions for new features and platform improvements.

• Write high-quality, maintainable, and well-tested code.

• Ensure the performance, scalability, and reliability of the systems you build (contributing to the 99.9% SLA target).

• Actively promote and implement engineering best practices within the team (testing, CI/CD, monitoring, documentation).

• Explore, prototype, and integrate AI-based solutions, tackling the associated technical challenges.

• Actively participate in engineering team life: knowledge sharing, insightful code reviews, technical discussions, and continuous improvement initiatives.

• Potentially provide technical guidance and mentorship to more junior engineers.

💻 Our Tech Stack

• Languages & Frameworks
  TypeScript, React, Bun, Node.js

• Infrastructure & Cloud
  Azure (App Services, Functions, SQL Database, Service Bus…)
  Infrastructure as Code with Terraform

• Testing
  Vite, Jest / Vitest, React Testing Library, Playwright

• CI/CD & Tooling
  GitHub-centric workflows (CI/CD pipelines, code reviews, automation)

🎁 What We Offer

• Attractive Compensation: Fixed salary between €60k and €80k per year, depending on profile and experience.

• Exceptional Flexibility: Choose how you work! Either hybrid in Paris (2 days remote work/week in our superb offices near St Lazare), or 100% Remote Work from France (several team members are already full remote!). Plus 2 weeks of “Work from Anywhere” per year.

• Technical Impact and Autonomy: A key role with significant technical ownership and the autonomy to tackle complex problems and influence the technology direction in a growing company.

• Professional Development: A structured onboarding process, continuous training opportunities, and the chance to work deeply with cutting-edge technologies (AI).

• Strong Company Culture: Join a caring, transparent, and committed team where mutual support, technical excellence, and collaboration go hand in hand.

• Modern Work Tools: MacBook Pro or Dell, quality equipment provided to work in the best conditions.

• Social Benefits: Alan company health insurance, Swile Restaurant Vouchers, transport reimbursement, frequent team events (afterworks, seminars, etc.).

🧠 Who Are You?

We are looking for a highly skilled and autonomous Senior Full Stack Engineer with a passion for technology, product, and solving complex problems.

• Deep Experience: You have 7+ years of software development experience, demonstrating a strong track record of designing, building, and shipping complex, scalable systems, preferably in a SaaS environment (min. 3 years SaaS experience).

• Full Stack Mastery: Deep expertise in the JavaScript/TypeScript ecosystem (React front-end) and Node. You have strong experience with databases (SQL/NoSQL) and designing/implementing distributed systems architecture.

• Technical Depth & Design Skills: Proven ability to design elegant, robust, and maintainable solutions for complex technical challenges. You think critically about architecture and trade-offs.

• Product Awareness: You understand how technical decisions impact the user experience and can translate functional requirements into high-quality technical solutions.

• Problem Solver: You excel at diagnosing and solving complex technical issues, often taking initiative to identify and address potential problems proactively.

• Quality & Best Practices Champion: You are a strong advocate for high-quality code, comprehensive testing (TDD/BDD), CI/CD, and other engineering best practices.

• Strong Communicator & Collaborator: Excellent communication skills (Fluent English required, French is a plus), capable of discussing complex technical topics clearly and collaborating effectively with Product, Design, and other engineers. Experience mentoring junior engineers is a plus.

• Curiosity & Drive: You are passionate about learning new technologies (especially AI) and continuously improving your skills and the systems you work on.

Even if you don’t meet 100% of the criteria, but you possess deep technical skills and are passionate about the project, we would be delighted to review your application!

• Step 1: Manager Interview (45-60 min, video call): In-depth discussion with Boris (VP Engineering) or Xavier (CPO) about your experience, technical depth, and motivations.

• Step 2: Deep Technical & Architecture Discussion (90-120 min, video call): Deep dive with senior engineers and/or CTO on system design, architecture, and complex problem-solving based on your experience and potentially the test outcome.

• Step 3: Team Fit & Final Chats (45-60 min, video call): Meet potential teammates to discuss ways of working and ensure mutual fit. Possibly a final brief chat with CTO/CPO.

• Step 4: Reference check

• Step 5: Offer 🎉