About this role

Arista Networks is hiring a mid-level Software Engineer based in Nashua, NH. The posting calls out experience with Python, C, Embedded Systems, Linux.

Role: Software Engineer
Function: software engineering
Level: mid
Track: Individual contributor
Employment: Full-time
Location: Nashua, NH
Department: Software Engineering
Posted: Jul 7, 2026

AI Summary

Mid-level PCIe software engineer writing low-level firmware and Linux drivers for high-speed communication between hardware components in network switches. Diagnose and fix bugs at the hardware/software boundary, tuning PCIe parameters and bringing up new hardware designs. Requires significant hands-on experience with firmware diagnostics and troubleshooting.

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Job description

from Arista Networks careers

Company Description

Arista Networks is an industry leader in data-driven, client-to-cloud networking for large data center, campus and routing environments. What sets us apart is our relentless pursuit of innovation. We leverage the latest advancements in cloud computing, artificial intelligence, and software-defined networking to provide our clients with a competitive edge in an increasingly interconnected world. Our solutions are designed to not only meet the current demands of the digital landscape but to also anticipate and adapt to future challenges.

At Arista we value the diversity of thought and perspectives that each employee brings to the table. We believe that fostering an inclusive environment, where individuals from various backgrounds and experiences feel welcome, is essential for driving creativity and innovation.

Our commitment to excellence has earned us several prestigious awards, such as Best Engineering Team, Best Company for Diversity, Compensation, and Work-Life Balance. At Arista, we take pride in our track record of success and strive to maintain the highest standards of quality and performance in everything we do.

Job Description

Who You'll Work With

Operating right where hardware meets software, the Platform team builds the foundation for our networking ASICs and supporting infrastructure. PCIe software engineers write the code that manages high speed communication between hardware components in our switches. We work with hardware, diagnostics, and software engineers to maximize bandwidth and improve reliability on the PCIe links.

What You'll Do

As part of this team, you’ll work on projects like:

Bringing up pcie links on new hardware designs
Tuning pcie parameters on root ports, bridges, and end points
Modifying the linux pci drivers and virtual memory allocation
Using AER and DPC to improve error visibility and resiliency
Developing userspace software that mediate between networking ASICs, FPGAs, and PCIe bridges.
Measuring hardware read and write performance
Develop automated tests using C, C++ and Python to validate your features.

Qualifications

Strong engineering and Computer Science fundamentals.
3+ years fluency in C or C++. Python experience an added bonus.
Solid understanding of PCIe hardware and software drivers
PCIe state machine, ltssm, tlp, credit flow control knowledge a plus
Experience with PCIe switches
Significant hands-on experience diagnosing problems, troubleshooting issues, and fixing bugs in low-level firmware

If you’re passionate about performance optimizations and enjoy working at the hardware/software boundary, the Platform team is a perfect choice!

Additional Information

Arista Networks is an equal opportunity employer. Arista makes all hiring and employment-related decisions in a non-discriminatory manner without regard to race, color, religion, sex, sexual orientation, gender identity, national origin or any other factor determined to be unlawful under applicable federal, state, or law law. All your information will be kept confidential according to EEO guidelines.