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 Node.js

• 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: Node.js (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 Node.js

• 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

1. HR Interview -30 min
2. Technical interview – 1 hour
3. Live Case + Debrief – 1 hour
4. Team Fit – 1 hour
5. Final Interview - 1 hour