Developer

About us

At Sanofi, we chase the miracles of science to improve people’s lives. All our decisions are taken with our most important stakeholder in mind – the patients.

Having a rich history of innovation that dates back over 100 years, Sanofi more than ever stays true to its commitment to transform the practice of medicine by providing potentially life-changing treatments and the protection of life-saving vaccines to millions of people. This history includes the first treatments for many rare diseases and the establishment of standards of care in diabetes and cardiovascular disease. Sanofi’s commitment to public health has helped protect hundreds of millions of people from influenza every year for decades and pushed polio to the brink of eradication, while its scientific vision has led to breakthrough innovations in the treatment of inflammatory diseases.

~ 43.07Bn€ Net Sales FY23

~90 countries

~ 91K employees

~ 59 manufacturing sites

~ 20 R&D sites

About the job:

At Sanofi, we’re committed to providing the next-gen healthcare that patients and customers need. It’s about harnessing data insights and leveraging AI responsibly to search deeper and solve problems sooner than ever before. Join our Digital team as a Senior Backend Developer and you can help make it happen. Your job? Design and lead the development of scalable backend systems that power digital healthcare products across our platform. You’ll work closely with cross-functional teams to implement APIs, drive architecture, and apply modern DevOps and AI-driven development practices.

We are an innovative global healthcare company with one purpose: to chase the miracles of science to improve people’s lives. Digital & Data is at the heart of Sanofi. Our ambition is to be the leading digital healthcare platform to develop and deliver medicine faster, enable healthcare professionals to improve treatments, and help patients improve their health. Ready to get started?

Main responsibilities:

• Design, develop, and maintain enterprise-grade backend systems using Java Spring Boot (Java 17+), with code primarily generated using LLM tools such as GitHub Copilot

• Architect and optimize Spring Gateway services to ensure secure, reliable, and scalable API management

• Define and maintain modular system architecture with a focus on domain-driven design and service abstraction

• Leverage existing libraries, frameworks, and open-source tools to accelerate development and avoid redundant efforts

• Implement distributed backend systems with components such as Elasticsearch (for search/analytics), Redis (for caching), and PostgreSQL or similar RDBMS

• Lead Kubernetes-based deployments using Helm, and optimize cloud-native runtime environments

• Drive CI/CD workflows using GitHub Actions to automate build, test, and deployment pipelines

• Define and manage Infrastructure as Code using Terraform or similar IaC tools to provision cloud resources

• Collaborate with frontend, data, and DevOps teams to deliver integrated solutions across the product stack

• Use C# or Python where needed to support platform integration and interoperability

• Mentor junior developers and foster LLM-assisted coding practices across the team

• Establish and enforce best practices in code quality, testing, and deployment standardization

• Continuously evaluate and introduce emerging technologies to enhance our backend capabilities

• Communicate effectively with global stakeholders in English, while working in a Chinese-speaking development environment

You are a software engineer that wants to collaborate with teammates to implement a new feature and help improve our products. Add us to our existing services or roll out a new service to support this feature. Identify and help troubleshoot an issue affecting users in one of our many regions of the world. Participate in defining new product requirements and design together with the product team.

About you:

Experience:

• 7+ years of backend development experience, with at least 3 years in a senior or lead capacity

• Demonstrated expertise in generating high-quality code exclusively with LLM tools (e.g., GitHub Copilot, similar platforms)

• Expertise in Java Spring Boot (Spring MVC, Spring Data, Spring Security)

• Proven experience with Spring Gateway architecture and complex API design

• Hands-on experience with Elasticsearch, Redis, and relational databases (PostgreSQL/MySQL)

• Familiarity with NoSQL databases (e.g., MongoDB) and ORM frameworks (e.g., Hibernate)

• Strong database design and optimization skills (query tuning, indexing, ACID compliance)

• Proficiency with container orchestration using Kubernetes, Helm, and Docker

• Experience with GitHub CI/CD pipelines and infrastructure provisioning via Terraform

• Exposure to multi-language systems, with working knowledge of C# or Python

• Solid understanding of testing frameworks such as JUnit, TestNG, or equivalent

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  Soft skills:

  Strong “don’t reinvent the wheel” mentality; ability to reuse and integrate existing tools effectively

  Ability to work independently and as part of multiple teams inside a global engineering team

  You move fast, but thoughtfully and with a commitment to quality

  High energy, confident, and ambitious individual

  Must be a passionate communicator, willing to challenge and enhance ideas while preserving relationships

  Interested in lots of aspects of technology, not just one tech

  Must be as passionate as we are about chasing the miracle of science to improve people’s lives

  Personal ownership of tasks and tenacious approach to finding and fixing the root cause of issues

  Excellent written and verbal communication skills

  Service-oriented, flexible, positive team player

  Problem solving & critical thinking

  Technical skills:

  We have a diverse stack and as long as you are willing to work with a microservices approach, we are open-minded about your technology preferences. You’ll have the ability to explore new technologies and strategies.

  Some of the key tech we use:

  Backends: Java Spring Boot, RESTful APIs / GraphQL

  We use components of cloud platforms

  Frontends: Vue.js with Vant

  Databases: PostgreSQL/MySQL, MongoDB, Redis

  CI/CD: GitHub Actions, Terraform, Helm

  You don't have to be a specialist in everything but willing to learn

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  Language Proficiency:

  ·Fluent in English (spoken and written) for international collaboration

  ·Comfortable in Chinese for daily work and team communication

  Education:

  MS in software engineering or computer science or equivalent