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Senior Full Stack Engineer (remote)

Mozzaik365 is hiring!

About

Join Mozzaik365: Innovating for the Employee Experience Mozzaik365 is a fast-growing B2B SaaS startup specializing in creating modern and engaging Digital Workplace and intranet experiences on the Microsoft 365 ecosystem. Our mission is to transform how companies communicate and collaborate, making work simpler, more connected, and more productive. We cultivate a culture based on transparency, kindness, and commitment. In a phase of rapid acceleration, we are looking for passionate and highly skilled engineers to strengthen our Product & Engineering team and help us build a market-leading platform. If you are ready to make a significant technical impact and tackle complex challenges within an agile and ambitious team, read on!

🚀 Your Opportunity: Become a Key Technical Contributor to our Core Product As a Senior Full Stack Engineer, you will join our Engineering team. You will be a key technical expert working on our flagship products tackling some of our most complex challenges. Your role will be central to the technical evolution and success of our platform. You will be a go-to expert for designing and implementing robust, scalable solutions, driving technical excellence through your individual contributions.

Job Description

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

Salary: €70,000 - €80,000 gross per year  (English proficiency required, French is a plus)

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, C#/.NET, SPFX

  • Infrastructure: Azure (App Services, Functions, SQL Database, Service Bus, etc.)

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

  • CI/CD: Azure DevOps

🎁 What We Offer

  • Attractive Compensation: Fixed salary between €70k and €80k per year, depending on profile and experience.

  • Exceptional Flexibility: Choose how you work! Either hybrid in Paris (2-3 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.).

Preferred Experience

🧠 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 .NET back-end (C#). 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!

Recruitment Process

  • 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: Technical Test ⚒️: Technical test to be prepared autonomously on a platform (remote), focusing on problem-solving and coding skills.

  • Step 3: Deep Technical & Architecture Discussion (90-120 min, video call): Deep dive with senior engineers and/or Boris on system design, architecture, and complex problem-solving based on your experience and potentially the test outcome.

  • Step 4: 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 VP Eng/CPO.

  • Step 5: Reference check

  • Step 6: Offer 🎉

Additional Information

  • Contract Type: Full-Time
  • Location: Paris
  • Education Level: Master's Degree
  • Experience: > 7 years
  • Possible full remote
  • Salary: between 70000€ and 80000€ / year
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