About Me
I’m Jianjun Xue, a proactive Java Software Engineer & SaaS Architect with over 10 years of experience bridging technology and business.
My expertise spans cloud computing, distributed systems, high-concurrency architectures, and system optimization. I enjoy tackling complex challenges across both backend and frontend, delivering clean, efficient, and scalable solutions. I am proficient in Java, Spring Boot, and WordPress, and I am always eager to expand my technical horizons.
Beyond work, I stay curious and open-minded, exploring new ideas and embracing novel experiences — I believe in maintaining a balanced and meaningful life.
Currently based in Germany with an Opportunity Card Visa, I am seeking opportunities to contribute to digital transformation projects in software development and IT architecture.
Every day, I wake up motivated to make a real impact and drive innovation.
Work Experience
Career Transition & Frontend Development
Jul 2023 – Present
- Relocated to Berlin, Germany, successfully obtaining the German Opportunity Card and completing immigration adaptation
- Systematically studied English and German to enhance cross-cultural communication skills
- Researched the German job market, visa policies, and local workplace culture
- Self-learned frontend development and independently designed and built a personal website, gaining practical frontend experience
Senior Java Developer
Zhejiang Shipu Technology Co., Ltd. | Jun 2022 – Jul 2023
- Developed and maintained backend systems across multiple enterprise digital transformation projects
- Extracted reusable modules into lightweight SDKs to improve code modularity and reuse
- Built an internal code generation tool for automating standard CRUD scaffolding
- Designed and implemented a NoSQL-based low-code configuration system with real-time updates
- Applied DDD principles to define clean module boundaries
- Results: Increased development efficiency by 50%; enabled zero-downtime configuration deployment
Java Architect
Hangzhou Tianyan Intelligent Technology Co., Ltd. | May 2021 – Mar 2022
- Designed architecture and led core development of an AI-powered global waste trading platform
- Built a technical team from scratch; established coding standards and CI/CD pipelines
- Delivered MVP within 3 months including AI, contract, account, messaging, and multilingual modules
- Ensured elastic deployment, observability, and team collaboration
Java Development Expert
Hangzhou Tiangu Information Technology Co., Ltd. | Dec 2019 – Apr 2021
- Led architecture and development of an enterprise-grade low-code platform
- Delivered workflow engine, form builder, reporting dashboards, and visual configuration
- Developed 7 systems in 1 year, wrote 120,000+ LOC, and filed 2 technical patents
- Results: 3× efficiency gain; ~342 man-days saved
Senior Java Developer
NetEase Wuwei Bear Technology Co., Ltd. | Aug 2017 – Jun 2019
- Migrated monolithic transaction system to modular microservices for high-concurrency workloads
- Implemented monitoring, risk control, A/B testing, and load balancing
- Migrated from Oracle to DDB + RDS with zero downtime; boosted TPS from 800 to 3000+
Java Developer
Ant Financial (Ant Group) | Jun 2014 – Jul 2017
- Designed and implemented core modules for offline billing and accounting systems
- Processed massive datasets using ODPS SQL and Shell scripting for ETL and reconciliation tasks
- Optimized processing time from 12 hours to under 40 minutes
- Maintained internal configuration and monitoring pages using HTML, CSS, and JavaScript
- Supported frontend developers with bug fixes and UI adjustments in embedded admin tools
Skills
Java
Spring
SpringCloud
HTML
CSS
JavaScript
MySQL
Redis
Docker
Kafka
Git
Kubernetes
MongoDB
Node.js
TypeScript
AWS
Aliyun
Nginx
RocketMQ