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Lengow is a leader in intelligent e-commerce solutions that help brands and retailers drive profitable growth across the digital shelf. With powerful feed management, global price monitoring, and robust data capabilities, Lengow’s comprehensive SaaS product suite enables merchants to amplify product visibility online, outrun competition with informed pricing, multiply sales on marketplaces, and monitor brand presence among distributors. Since 2009, Lengow has fueled digital growth for over 3,600 customers across thousands of marketing and sales channels in over 60 countries. Our Tech Team The Tech, Data, and Product team comprises 70+ people from diverse backgrounds, working in our offices in Nantes, Paris, and Barcelona. Our products are developed thanks to six autonomous product Teams, each working on a specific business domain. The teams are led by a Product Manager and Engineer manager working with a dedicated small team of developers (from 4 to 8) Purpose of the job: We are seeking a highly skilled and experienced Senior Python Developer. The ideal candidate will have extensive experience in Python development, a deep understanding of clean architecture principles, and a strong background in CI/CD practices, particularly using GitHub Actions and ArgoCD. You will play a key role in designing, developing, and maintaining our software applications, ensuring they are scalable, maintainable, and robust. Your main tasks would be as follows : Development: - Design, develop, and maintain high-quality Python applications and services. Clean Architecture: - Implement and advocate for clean architecture principles to ensure a scalable, maintainable, and testable codebase. CI/CD Pipeline Management: - Design, implement, and maintain CI/CD pipelines using GitHub Actions and ArgoCD to automate workflows, deployments, and infrastructure management. Code Review and Mentorship: - Conduct code reviews, provide constructive feedback, and mentor junior developers to uphold best practices and coding standards. Testing: - Develop and maintain unit, integration, and end-to-end tests to ensure software quality and reliability. Technical environment: Langage : Python Framework : Django, Celery, FastAPI DB : PostgreSQL, Redis, AWS Outils : GitHub, Jira, Datadog, Docker, RabbitMQ Hiring process: Phone call with Alexandre our HR Interview with one of our Engineering Manager Technical test and restitution with Clément Head of Engineering and members of the tech team. Offer letter We are looking for someone with the following experiences and skills: Experiences : 4 years as Software developer in Python or other Object oriented programming language Proven ability to integrate AI Agents into the development lifecycle (e.g., automated code reviews, agentic testing, or AI-driven CI/CD) to enhance developer productivity and software quality. Skills & soft skills : Python Django, PostgreSQL, Celery, Docker Design & Architecture Leadership Curious / Autonomous / Good analytical skills / Force of proposal / Problem Solver At Lengow, we value diversity in all its forms and are committed to equal opportunities. All applications are considered based on skills and qualifications, including those from candidates with disabilities. ✨ Joining Lengow is also an opportunity to benefit from many advantages : Ticket restaurant 8 euros by day Malakoff Humanis Private insurance & Prevoyance. 3 Remote days per week Flexible hours Bike mileage allowances or 50% of transportation tickets. Remote allowances Professional events (Devoxx, Meetup ...) and regular internal cohesion. Weekly Happy Break on Thursday Evening at the office with food and beverage Syntec forfait jours with RTT - 218 annual working days, ie minimum 9 days off on top of 5 weeks legal paid leave Choose your laptop OS. You can work on MacOS, Windows or Linux.