Career

A Journey Through Telecom Evolution

Looking back at my 20 years in telecom software development, I’ve witnessed incredible technological transformations.

Early Days: Circuit-Switched Networks

When I started, the industry was dominated by traditional circuit-switched networks. We dealt with:

• TDM (Time Division Multiplexing) systems
• SS7 signaling protocols
• Legacy switching equipment

The Transition to Packet Networks

The shift to IP-based networks brought new challenges:

• Migration from circuit-switched to packet-switched architectures
• Implementing QoS in IP networks
• Integrating VoIP with traditional telephony

Modern Era: Cloud-Native Telecom

Today, the landscape has evolved dramatically:

Hello, I’m Jeffrey Li.

What You’ll Find Here

This blog covers:

• Tech Articles - Deep dives into telecom technologies, software engineering best practices, and industry insights
• Daily Life - Work experiences, project stories, and personal reflections

My Journey

Throughout my career, I’ve worked on various telecom projects including:

• Network infrastructure software
• Telecommunications protocols implementation
• Real-time communication systems
• Cloud-native telecom solutions

Coding Skills

• C++/C programming language over 20 years
• Essential python script technique and using for data analysis
• a little go language experience on HTTP Server/Client programming
• a little Java language experience

Domain Knowledge

• over 20 years telecom software experience
• familiar with 3GPP architecture and corresponding processes
• working for 2g/3g/4g/5g RAN nodes and Core network software implementation fields
• focusing on IP networking domain and resolve computer data communications issues.

Communication and Soft Skills

• General commercial and technical English speaking and writing
• Small group leadership on software development
• Agile development mindset
• open-minded on different opinions
• logical thinking
• strong problem-soling ability
• make decisions based on facts.

Software Engineering

Talking about software industry, it can be roughly broken down to 2 categories. One is small software which is can be done below 2~3 person in quite a few time, the other one is big software which needs thousands of person to be done in quite longer time. I believe the telecom software is the latter.