Overview
Calix is a cloud and appliance-based platform and managed services company. Broadband service providers leverage the Calix broadband platform, cloud, and managed services to simplify operations, engagement, and service, innovate for their consumer, business. and municipal subscribers and grow their business and the communities they serve.
In 2010, Calix China Development Center, "凯易讯," was established in Nanjing Software Valley, located on Software Avenue, with convenient transportation. We are a team of nearly 300 professionals specializing in software and hardware development, testing, supply chain management, and project management, etc. Our team members come from other renowned companies in the IT and Internet industries. We collaborate with multinational teams from the United States, India, and other countries to develop core products.
As a member of the global software development team, you will participate in the design and development of Software in embedded systems.
After interning with this team for more over six months, you will:
- Accumulate experience in the entire design, development, testing, and operation of enterprise-level software
- Gain programming experience primarily in C, Python, Shell, etc.
- Deepen your understanding of the development environment and ecosystem
- Improve your problem-solving and analytical skills
- Enhance your experience working in an all-English environment and collaborating with international teams
Internship Duration
- The internship can start immediately upon successful interview
- Work 3-5 days per week
- The internship period is 6 months or longer
Responsibilities
- Assist in the design, implementation, and testing of L2 protocols (e.g., Ethernet, VLAN, DHCP, IGMP, RSTP, Dot1.X, MPLS).
- Collaborate with senior engineers to develop and optimize protocol algorithms.
- Participate in code reviews and contribute to maintaining high code quality.
- Conduct performance analysis and troubleshooting of L2 network issues.
- Document development processes, test plans, and results.
- Stay updated with the latest industry trends and technologies related to networking protocols.
Basic Qualification
- Pursuing a bachelor’s or master’s degree, graduating in 2026 or 2027
- Available for an internship lasting 6 months or longer
- Major in Computer Science, Software Engineering, or a related field
- Hands-on programming experience with C/C++
- Experience with Linux software development
- Able to work collaboratively in a team environment
- Strong verbal and written communication skills
Preferred Qualification
- knowledge of Linux user space and kernel space interaction, including:
- Understanding of system calls, ioctl, and other kernel-user communication mechanisms
- Familiarity with kernel-user data exchange and synchronization methods
- Knowledge of network packet processing in the Linux kernel, including:
- Understanding of packet reception, transmission, and forwarding in the kernel
- Understanding of the kernel's network stack, including socket, TCP/IP, and Ethernet layers
- Knowledge of packet forwarding and routing mechanisms in the kernel
- Knowledge of Layer 2 protocols, including:
- ARP (Address Resolution Protocol): understanding of ARP request and response, ARP cache, and proxy ARP
- STP (Spanning Tree Protocol): understanding of STP topology, BPDU, and port states
- DHCP (Dynamic Host Configuration Protocol): understanding of DHCP client and server, DHCP lease, and IP address allocation
- IGMP (Internet Group Management Protocol): understanding of IGMP snooping, IGMP queries, and multicast group management
Allowance
- 200-280 RMB per day, adjusted based on the internship stage and performance.
Benefits
- Outstanding interns will be added to the Calix talent pool and considered for full-time positions
- Work in a global team with a multinational environment
- Open and transparent culture with friendly and equal mentors and colleagues
- Flexible working hours, no need to clock in
- Flexible work location, with the option for remote work when needed
- Adjustable desks and chairs for standing work
- Free drinks, fruits, and afternoon tea
- Free gym with shower facilities
