Principal Software Engineer - C/C++ Linux/Unix, Cloud

PubMatic is looking for engineers who can design and implement next-generation, highly scalable and low-latency ad server features at scale of 200 billion+ requests per day in our AD Server. If you get excited building applications and architecture to handle 100's of billions of requests per day, managing millions of requests per second with a creative and fast-paced work environment, competitive pay, great incentives, culture of teamwork, smart and friendly colleagues and plenty of opportunity to grow in your career then you should consider applying for this position.

What You'll Do

• Research, learn, design and build highly reliable, available and scalable platforms.


• Use best practices for software development and documentation, assure designs meet requirements, and deliver high-quality work.


• Demonstrated ability to self-direct and work independently.


• Demonstrate work ownership and focus to do deliver on time.


• Be the owner of one or more functionality module and point of contact for it.


• Perform code and design reviews for code implemented by peers or as per the code review process.


• Work with teams to achieve desired goals.


• Demonstrate timely and excellent verbal and written communication skills.


• Willing to go the extra-mile to achieve greater results.

We'd Love for You to Have

• Seven plus years of development experience in C/C++, Linux/UNIX environment. Good to have experience with GO language.


• Proficiency in the implementation of algorithms and the use of advanced data structures to solve problems in computing. A solid knowledge in the principles of computer science is desired.


• Good experience on software design and architecture.


• Good experience in building complex and scalable solutions.


• Ability to find optimal solutions and innovative ideas.


• Excellent problem-solving skills.


• Being able to use generative AI-based tools and IDE for getting work done.


• Understanding of different models at the basic level.


• Prompt engineering basics.


• Knowledge of OS and working experience on system programming (multi-threading, multi-processing, memory management).


• Troubleshoot any issues with existing features, live on production.


• Ability to write clean, modular and loosely coupled code.


• Ability to understand end-to-end product functionality.


• Working knowledge of scripting Perl/Python/Shell.


• Working experience in databases, preferably MySQL.


• Excellent interpersonal, written, and verbal communication skills.


• Proficiency in AI-assisted coding, automation, prompt engineering, and an understanding of the strengths and limitations of LLM-generated code is a strong plus

AI-Enabled Engineering Mindset:

We value engineers who actively leverage Generative AI tools and IDEs (e.g. GitHub Copilot, ChatGPT, Claude, Cursor, Windsurf etc.) to accelerate development, improve code quality, automate repetitive tasks, and enhance documentation and debugging workflows. Engineers who demonstrate AI-first thinking using these tools to drive faster experimentation, ideation, and technical execution will thrive in our high-scale, performance-critical environment.

Qualifications: 

• Should have a bachelor’s degree in engineering (CS / IT) or equivalent degree from well-known Institutes / Universities.

Additional Information: