Senior Backend Engineer PHP OR GOLANG

Join to apply for the Senior Backend Engineer PHP OR GOLANG - RetailTech (H/F) role at ARION Search. This range is provided by ARION Search. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more. Base pay range Location: Paris Contract: Permanent (CDI) Remuneration: €59,000 - €76,000 gross per year (depending on profile) + Equity Start Date: As soon as possible Remote Policy: Hybrid work model (2 days remote per week) About Our Client On behalf of our client, a European tech unicorn and the undisputed leader in its B2B marketplace sector, we are seeking to recruit elite engineering talent. Our client is dedicated to revolutionizing the retail industry with a mission to 'rewild retail,' creating a virtuous ecosystem that empowers independent businesses. Backed by world‑class investors and valued at over €1.75 billion, they operate at a significant scale where the engineering division is the core of their success, fostering a culture of technical excellence, agility, and high impact. The Role This is not a standard development role. We are mandated to find exceptional Senior Backend Engineers to join our client's elite team in Paris. The selected candidates will be instrumental in designing the future of the platform, evolving its architecture from a monolith to a distributed microservices system, and pioneering the integration of Generative AI to create a genuine competitive advantage. You will operate within an autonomous, cross‑functional squad, collaborating with top‑tier Engineering Managers, Product Managers, and Designers to solve complex challenges that define the future of European e‑commerce. Key Responsibilities Architectural Evolution: Actively contribute to the design and implementation of a scalable, resilient, and performant microservices architecture. Core Feature Development: Design, develop, and maintain critical backend services using PHP 8.3 (Laravel 10) and/or Go. AI Integration: Explore and implement innovative features leveraging Generative AI, transforming the product offering and user experience. Technical Excellence: Write clean, maintainable, and rigorously tested code. Champion best practices in software engineering, including comprehensive code reviews and robust documentation. Mentorship: Mentor other engineers, elevating the team's technical capabilities and fostering a culture of continuous improvement. System Reliability: Participate in the on‑call rotation to ensure the stability and high availability of the production environment. Candidate Profile We have exceptionally high standards. Candidates will only be considered if they meet the following specific criteria: Minimum of 5 years of professional backend engineering experience, with a significant portion at a reputable, high‑growth scale‑up or technology company renowned for its engineering excellence. Experience that demonstrates the ability to thrive in a fast‑paced, demanding environment. Technical Mastery Demonstrable expertise in PHP (with a modern framework like Laravel or Symfony) or Go. Proficiency in both is a significant asset. Proven experience in designing and building RESTful APIs and working within a microservices architecture. Strong command of database design and optimization, particularly with MySQL. Location & Commitment Hybrid role based in our client's Paris headquarters; requires residence within the Paris metropolitan area. Mandatory on‑site presence: 3 days per week. Absolute fluency in English is essential, as it is the official working language for all internal communication, documentation, and meetings. Additional Valued Expertise Hands‑on experience with message queuing systems (e.g., RabbitMQ). Knowledge of search technologies such as Elasticsearch. Familiarity with our client's cloud and containerisation stack (GCP, Kubernetes). A strong product‑oriented mindset, with a proven ability to translate business needs into technical solutions. What Our Client Offers A highly competitive compensation package, including a base salary of €59k‑€76k and a significant, meaningful equity plan (BSPCE). An opportunity to join a European unicorn and work on a product with a tangible impact on the economy. A stimulating, fast‑paced environment that fosters innovation and embraces cutting‑edge technologies like Generative AI. Comprehensive benefits, including premium health insurance, meal vouchers, access to a benefits platform, and a continuous learning platform. About ARION SEARCH ARION SEARCH is a recruitment firm specializing in Tech & Executive Search. Founded and led by a former Engineering Manager, we support major CAC40 and NEXT40 companies, as well as fast‑growing scale-ups and unicorns across France and Europe. We are recognized for our 360° TECHNO* evaluation methodology, our ultra‑selective shortlists, and our ability to secure the most strategic hires with precision and reliability. Seniority level Mid‑Senior level Employment type Permanent (CDI) Job function Other Industries Staffing and Recruiting #J-18808-Ljbffr