About the Company

Calix provides the cloud, software platforms, systems, and services required for communications service providers to simplify their businesses, enhance subscriber experiences, and drive growth. With a strong focus on innovation and digital transformation, Calix enables its customers to deliver secure, scalable, and efficient solutions in an increasingly connected world.

Introduction

Calix is seeking a highly motivated Software Development Intern to join its Threat Intelligence team. This role offers hands-on experience in building and maintaining advanced security systems while contributing to research and development initiatives.

As an intern, you will collaborate with experienced engineers and security researchers to develop threat detection frameworks that protect customers from evolving cybersecurity risks. You will gain practical exposure to backend systems, frontend technologies, and database design, while working on real-world security challenges in a dynamic and fast-paced environment.

Key Responsibilities

Technical Development

Assist in the design, development, and testing of backend automation services and frameworks.
Write clean, maintainable, and efficient Python code to build scalable solutions.
Develop and maintain backend services using Django and/or Flask for data processing pipelines.
Work with relational (MySQL/PostgreSQL) and non-relational (MongoDB) databases for data storage and querying.

Execution & Problem Solving

Support threat detection engineering by implementing and optimizing detection algorithms.
Debug issues, fix bugs, and contribute to system performance improvements.
Apply data structures and algorithms to solve real-world engineering problems.
Assist in maintaining operational efficiency through automation and optimization.

Growth & Collaboration

Collaborate with team members using Git and participate in code reviews.
Contribute to CI/CD pipelines and assist in deployment processes.
Participate in agile workflows, including sprint planning and task tracking using JIRA.
Document code, workflows, and technical learnings as required.
Develop basic UI components using HTML, CSS, and JavaScript for monitoring and visualization when needed.

Required Qualifications

Currently pursuing or recently completed a Bachelor’s or Master’s degree (2024/2025) in Computer Science or Information Technology.
Strong programming skills in Python with solid problem-solving abilities.
Understanding of data structures and algorithms and their practical applications.
Knowledge of relational (RDBMS) and non-relational (NoSQL) databases.
Familiarity with Django and/or Flask frameworks and basic frontend technologies (HTML, CSS, JavaScript).
Experience with Git and version control systems.
Ability to debug issues and work with existing codebases.
Willingness to learn, take feedback, and collaborate effectively in a team environment.

Preferred Qualifications

Exposure to REST APIs and backend architecture concepts.
Familiarity with CI/CD pipelines and deployment workflows.
Experience working in Linux environments and using command-line tools.
Basic understanding of software testing practices.
Interest or exposure to cybersecurity and threat intelligence concepts.

Why Join Us / Benefits

At Calix, you will gain valuable hands-on experience working on real-world cybersecurity challenges while being part of an innovative and collaborative team. This internship provides a strong foundation for building a career in software development and security engineering.

Hands-on experience with cutting-edge threat intelligence and security systems.
Opportunity to work with experienced engineers and security professionals.
Exposure to modern backend, frontend, and database technologies.
Collaborative and learning-focused work environment.