Zhenyu Zhang - Backend Engineer (Java)

Q: Where is Zhenyu based?

Zhenyu is based in Berlin, Germany .

Q: What languages does Zhenyu speak?

Zhenyu speaks the following languages: Chinese (Native), English (Intermediate) .

Q: How many years of experience does Zhenyu have?

Zhenyu has at least 6 years of experience. During this time, Zhenyu has worked in at least 2 different roles and for 1 company . The average length of individual experience is 3 years and 11 months . Note that Zhenyu may not have shared all experience and actually has more experience.

Q: What is Zhenyu's latest experience?

Zhenyu's most recent position is Backend Engineer (Java) at Huawei .

Q: What companies has Zhenyu worked for in recent years?

In recent years, Zhenyu has worked for Huawei .

Q: Which industries is Zhenyu most experienced in?

Zhenyu is most experienced in industries like Telecommunication .

Q: Which business areas is Zhenyu most experienced in?

Zhenyu is most experienced in business areas like Information Technology and Business Intelligence .

Q: Which industries has Zhenyu worked in recently?

Zhenyu has recently worked in industries like Telecommunication .

Q: Which business areas has Zhenyu worked in recently?

Zhenyu has recently worked in business areas like Business Intelligence and Information Technology .

Recommended expert

Berlin, Germany

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Experience

Apr 2021 - Jun 2024

3 years 3 months

Backend Engineer (Java)

Huawei

Built a scalable data platform processing millions of structured records daily from multiple sources, enabling near real-time analytics, dashboards, and secure report exports.
Supported business decision-making by reducing latency in insights and ensuring data reliability.
Designed and deployed high-throughput Kafka ingestion pipelines, reliably processing millions of records daily for enterprise analytics.
Built a Redis-based distributed self-healing task system, reducing manual intervention by ~90% and improving overall platform reliability.
Improved database write performance, increasing ingestion throughput by ~40% and enabling near real-time data availability.
Developed high-performance RESTful APIs for multi-dimensional analytics and TopN statistics, supporting enterprise teams in identifying key trends and anomalies.
Optimized queries with caching, materialized views, and partitioned tables, reducing latency under heavy load by ~80%.
Integrated application-layer Role-Based Access Control (RBAC) to enforce fine-grained data permissions, ensuring secure API access and compliance.
Improved Jenkins + AWS EKS CI/CD pipelines for zero-downtime deployments and automated rollback, reducing deployment failures by ~90%.

Aug 2018 - Mar 2021

2 years 8 months

Backend Engineer (Golang)

Huawei

Managed millions of configuration records daily, implementing partitioned processing pipelines to improve throughput by ~30%.
Introduced per-record retries, automated alerting, and nightly consistency checks, proactively detecting and resolving potential data inconsistencies.
Designed unified RESTful APIs handling both synchronous and asynchronous message flows, ensuring low latency and high reliability.
Reduced service downtime through heartbeat-based liveness detection, automatic service re-registration, and upstream failover notifications.

Industry Experience

See where this freelancer has spent most of their professional time.

Experienced in Telecommunication.

Telecommunication

Business Area Experience

See which departments and functions this freelancer has contributed to most.

Experienced in Information Technology and Business Intelligence.

Information Technology

Business Intelligence

Summary

Experienced backend engineer with 5+ years in designing and building high-scale data platforms and microservices. Skilled in Java, Go, PostgreSQL, Redis, Kafka, and cloud-native architectures on AWS and Kubernetes. Proven track record in optimizing data ingestion, ensuring high availability, and delivering reliable APIs for large-scale applications. Strong focus on performance, scalability, and business impact.

Languages

Chinese

Native

English

Intermediate

Education

Aug 2014 - Jun 2018

Xidian University

Bachelor’s · Software Engineering · Xi An Shi, China

Statistics

Experience

Total positions 2

Experience in Telecommunication 6 y

Avg length 2 y 11 m

Longest experience 3 y 2 m

Expertise

Recent roles Backend Engineer (Java), Backend Engineer (Golang)

Main industries Telecommunication

Main business areas Information Technology, Business Intelligence

Qualifications

Highest degree Bachelor

Profile

Created

November 2025

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Frequently asked questions

Have questions? Find more information here.

Zhenyu is based in Berlin, Germany.

Zhenyu speaks the following languages: Chinese (Native), English (Intermediate).

Zhenyu has at least 6 years of experience. During this time, Zhenyu has worked in at least 2 different roles and for 1 company. The average length of individual experience is 3 years and 11 months. Note that Zhenyu may not have shared all experience and actually has more experience.

Based on recent experience, Zhenyu would be well-suited for roles such as: Backend Engineer (Java), Backend Engineer (Golang).

Zhenyu's most recent position is Backend Engineer (Java) at Huawei.

In recent years, Zhenyu has worked for Huawei.

Zhenyu is most experienced in industries like Telecommunication.

Zhenyu is most experienced in business areas like Information Technology and Business Intelligence.

Zhenyu has recently worked in industries like Telecommunication.

Zhenyu has recently worked in business areas like Business Intelligence and Information Technology.

Zhenyu holds a Bachelor in Software Engineering from Xidian University.

Zhenyu is immediately available full-time for suitable projects.

Zhenyu's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.

To hire Zhenyu, click the Meet button on the profile to request a meeting and discuss your project needs.

Salary / Daily Rate Distribution

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<€640 €640-800 €800-960 €960-1120 €1120-1280 €1280+

The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.

Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.

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Daily rate avg. 903 €

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Median rate 800 €

The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.

Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.