Senior Backend Developer

il y a 1 semaine

Paris, Île-de-France WITCO, Inc Temps plein 90 000 € - 120 000 € par an

At Witco, we're reinventing the way people experience their workplace. Our all-in-one platform powers seamless communication, space management, and employee services across 1,000+ sites in 10+ countries.

To support our rapid growth and deliver an even better experience to our users, we are hiring a Senior Backend Developer to help build the next generation of features, scale our architecture, and mentor junior developers.

Your Mission

As a Senior Backend Developer, you'll join a cross-functional squad (Product, Design, Dev) and play a central role in building our core backend services. Reporting to the CPTO, your key mission will be to ensure robustness, scalability, and performance across all backend layers of our SaaS platform.

You'll be responsible for:

  • Designing and implementing scalable APIs and services in

  • Collaborating with Product and Frontend teams to build impactful features

  • Ensuring high performance and availability in a multi-tenant SaaS environment

  • Participating in architectural decisions and refactors as we scale

  • Maintaining best practices in testing, documentation, and security

  • Contributing to code reviews and mentoring team members

Our Stack

  • Backend: (NestJS), PostgreSQL, Redis

  • Frontend: React (TypeScript)

  • DevOps: Azure, Docker, GitHub Actions, Datadog, Sentry

  • Tools: Jira, Notion, Figma, Slack

What We're Looking For

Must-Haves

  • 4+ years of experience in backend development, with strong command of

  • Experience with REST APIs, SQL databases (ideally PostgreSQL), and scalable architectures

  • Solid understanding of software engineering principles: testing, CI/CD, security, performance

  • Experience working in an Agile product environment

  • Strong communication and teamwork skills

  • Fluent in French, with a high level of English

Nice to Have

  • Knowledge of multi-tenant SaaS environments

  • Experience with NestJS, Azure, or authentication systems (SSO, OIDC…)

  • Past experience in a scale-up or fast-paced product company

  • Mentorship or technical leadership experience

Why Join Us

  • Join a collaborative, ambitious, and international team in central Paris

  • Work on a high-impact product used daily by thousands of users

  • Ownership and autonomy: we trust you to make technical decisions

  • Training budget, regular team offsites, and 1–2 days remote/week

  • Lunch vouchers, health insurance (Alan), and top-tier equipment

Hiring Process

  • HR Interview -30 min

  • Technical interview – 1 hour

  • Live Case + Debrief – 1 hour

  • Team Fit – 1 hour

  • Final Interview - 1 hour

  • senior backend developer

    il y a 2 semaines

    Paris, Île-de-France STATION F Temps plein 60 000 € - 120 000 € par an

    AboutShareID is an innovative scale-up specializing in real-time identity verification.Our mission: enable companies to secure access to their services while offering a smooth and instant user experience.We build cutting-edge technological solutions combining biometrics, AI, and cryptography, used by international partners.As part of our strong growth, we...

  • Senior Backend Developer – Java 21

    il y a 21 heures

    Paris, Île-de-France OneSource Consulting Temps plein 60 000 € - 80 000 € par an

    Role:Senior Backend Developer – Java 21 / KafkaDuration: 218 DaysLocation: 75001 Paris, FranceRemote Work: OnsiteWork Regime: Full TimeLanguages: French, EnglishJob Description:Context:We are looking for an experienced Backend Developer to strengthen a tech team on a high-volume data project. The goal is to design, develop, and optimize robust, scalable,...

  • Senior Backend Engineer

    il y a 2 semaines

    Paris, Île-de-France Ed Temps plein 80 000 € - 120 000 € par an

    Aujourd'hui, nous cherchons un(e)Senior Backend Engineerpour devenir un(e) acteur(rice) clé dans le développement de notre produit. Si vous êtes passionné(e) par les systèmes backend robustes et scalables, par l'AI, et que vous souhaitez contribuer à la révolution de l'éducation grâce à la tech, ce rôle est fait pour vous.Vous reporterez...

  • Backend Go senior Developer

    il y a 1 semaine

    Paris, Île-de-France Adevinta Temps plein 60 000 € - 120 000 € par an

    The right career for allCreated in 2006, is an exchange platform that simplifies access to consumption, favors local relations and makes digital a tool at the service of all. leboncoin is positioned as a digital, economic, societal, innovative player, always with the same objective: to facilitate all day-to-day exchanges for all of our users. We give a...

  • Backend Go senior Developer

    il y a 1 semaine

    Paris, Île-de-France Leboncoin Temps plein 80 000 € - 120 000 € par an

    The right career for allCreated in 2006, is an exchange platform that simplifies access to consumption, favors local relations and makes digital a tool at the service of all. leboncoin is positioned as a digital, economic, societal, innovative player, always with the same objective: to facilitate all day-to-day exchanges for all of our users. We give a...

  • Senior Backend Engineer

    il y a 5 jours

    Paris, Île-de-France Neosoft Temps plein 63 000 € - 75 000 € par an

    Cherry Pick est à la recherche d'un Senior Backend Engineer pour un client dans le secteur de la DeepTech qui développe une solution d'assistant vocal.Missions principales :Concevoir, développer et optimiser les services backend qui alimentent la plateforme d'IA conversationnelle vocale.Développer des API et des microservices évolutifs à l'aide de...

  • Backend Go senior Developer

    il y a 1 semaine

    Paris, Île-de-France Adevinta Temps plein 90 000 € - 120 000 € par an

    The right career for allCreated in 2006, is an exchange platform that simplifies access to consumption, favors local relations and makes digital a tool at the service of all. leboncoin is positioned as a digital, economic, societal, innovative player, always with the same objective: to facilitate all day-to-day exchanges for all of our users. We give a...

  • Senior backend developer

    il y a 3 jours

    Paris, Île-de-France OOTI Temps plein 50 000 € - 80 000 € par an

    OOTI est à la recherche d'un développeur backend expérimenté pour rejoindre notre équipe produit. En collaboration avec notre lead developer, notre product owner et nos développeurs, tu auras l'opportunité de contribuer à l'amélioration globale de notre produit et des services que nous offrons aux architectes et aux cabinets d'architecture.Tes...

  • Senior Backend Developer with MLOps Experience

    il y a 16 heures

    Paris, Île-de-France GetVocal AI Temps plein 60 000 € - 120 000 € par an

    GetVocal AIis a dynamic startup pioneering the next frontier of voice-based conversational AI for enterprise applications. Our technology combines advanced speech recognition and natural language processing to enable seamless, human-like phone interactions between users and AI agents. We are committed to transforming customer service and engagement with...

  • Senior Backend Engineer

    il y a 2 semaines

    Paris, Île-de-France La Fosse Temps plein 90 000 € - 120 000 € par an

    We're looking for an experiencedSenior Backend Engineerto join a high-impact tech team building a next-generation finance platform. This role is perfect for someone who thrives on solving challenging backend problems, optimizing systems for performance, and mentoring peers.What the Client is Looking For:5+ years of experience with Python / Flask /...