Jianfeng Xu

CONTEXT: Development of the new Leclerc e-commerce site, development and implementation of the Leclerc brand's click-and-collect offering. Replacement of about ten vertical sites with a single site, integrating a marketplace dimension through interface with Mirakl services.

AREA OF EXPERTISE:

- Development and design of APIs in NestJS (microservices architecture)

- Architecture design and analysis, POC (proof of concept) realization

- Development of frontend components (Angular 13)

- Audit and improvement for performance issues, at the MongoDB/Application/Network level

- Creation and maintenance of asynchronous jobs (offer activation, stock updates...)

- Integration with third-party data flows & APIs (payment, stock)

- Estimation / Costing for user stories, sprint planning and grooming meetings with client

- Contribution to CI/CD flow optimization (docker, kubernetes, jenkins)

- Code review, pair programming, documentation

TECHNICAL ENVIRONMENT:

NodeJS, Typescript, Angular 13, NestJS, ELK, GCP, Redis, Neo9 Catalog, Docker, Kubernetes, RabbitMq, Mongo cloud / MongoDB, Java13, Spring, Camunda, microservices, CQRS event driven,

CONTEXT:

Microservices architecture refactoring/migration mission, my client is an online B2B vehicle reservation platform. To date, they have over 1500 high-quality vehicle suppliers registered on the platform as partners, with various vehicle resources across Europe. I was involved as a senior developer for design and development. (Team of 2 developers and 1 PO)

AREA OF EXPERTISE:

- Development of registration and payment APIs from scratch with API Platform

- Architecture design and analysis, documentation and diagramming (miro)

- Deployment management with Jenkins and migration of pipelines to Azure

- Performance and functional testing with Postman / newman

- Refactoring and performance optimization of PostgreSQL databases

TECHNICAL ENVIRONMENT:

Microservices architecture, PHP8, API Platform, .NET Core, Linux, Azure, Docker, PostgreSQL / MongoDB, RabbitMq, Gitops, Jenkins, REST, Postman, PostgreSQL

CONTEXT: Mission within the Total Marketing & Services team, 6 developers, 2 testers, 2 POs. Responsible for backend APIs for several HUB_B2C applications (wash, pay-at-pump, charge-plus ...)

AREA OF EXPERTISE:

- Development of APIs (in NestJs) from scratch, integration of third-party dependent solutions (Fiserv, Azure Bus...)

- Development & evolution of legacy APIs (Laravel 5, NodeJS), migrations to NestJs

- Lead dev for a squad of 3 developers and elaboration with CTO for technical frameworks, code review,

definition of development standards

- Creation of a private registry package and a new NestJs "poly-repo" architecture, migration from the old "mono-repo" architecture (14 microservices to manage)

- Facilitation of technical workshops, recommendation of best practices among developers (code analysis

with Sonar, local containerization ...)

- Evolution into DevOps role: creation of Azure deployment pipelines, administration of a Kubernetes cluster

up to pre-production, rebuilding docker images to improve performance