Senior Software Engineer – Layer1, C++

Arista Networks

. Develop software managing physical-layer networking connectivity, from 1GBASE-T connectors to 1.6T long-reach optics .

Posted 9/22/2026full-timeRemote • IrelandSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in software development for physical-layer networking, utilizing C, C++, and Python to design and implement Layer1 features. Capable of providing technical leadership, mentoring engineers, and collaborating with cross-functional teams to ensure high-quality project delivery.

Highest-signal resume keywords

C ProgrammingC++ ProgrammingPython ProgrammingLayer1 Feature DevelopmentTechnical Leadership

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Hard Skills

Software Engineering PrinciplesProblem-SolvingSoftware TroubleshootingDigital Communication TechnologiesIP NetworkingDistributed SystemsLow-Level Hardware Interaction

Soft Skills

Team CollaborationMentoring

Tools & Technologies

UNIXLinux

Industry Keywords

Physical-Layer NetworkingForwarding EnginesTelemetry ToolsOptics StandardsCustomer Interaction

Tech Stack

Tools & technologies

Distributed SystemsLinuxPythonUnixC++

About the role

Key responsibilities & impact

Develop software managing physical-layer networking connectivity, from 1GBASE-T connectors to 1.6T long-reach optics
Write control software spanning forwarding engines, connectors, and interface chips/gearboxes
Build instrumentation and telemetry tools to monitor and troubleshoot physical link health
Work with Optics teams to define standards for new media and bring them to market
Interface with customers, product management, and hardware engineers to develop Layer1 features
Architect, design, and manage feature development
Develop and maintain features using C, C++, and Python
Review and contribute to functional and design specifications
Build automated tests and test infrastructure
Work with hardware and manufacturing teams to bring new Layer1 components, including PHYs and transceivers, to market
Collaborate with hardware engineers to design software control interfaces for Layer1 components
Provide technical leadership across features, projects, and tools
Analyze, mitigate, and fix problems in customer networks with Customer Support Engineers and customers
Analyze system-test problems and provide fixes
Mentor new and junior engineers
Own projects from definition through deployment and customer interactions, ensuring delivery quality

Requirements

What you’ll need

BS in Computer Science, Electrical Engineering, or Computer Engineering plus 8 years of experience; or MS in one of these fields plus 6 years of experience; or Ph.D. in one of these fields plus 3 years of experience; or equivalent work experience
Expert knowledge of C or C++ and Python
Knowledge of UNIX or Linux
Applied understanding of software engineering principles
Strong problem-solving and software troubleshooting skills
Ability to design a solution and implement features independently
Ability to work in small teams
Knowledge of digital communication technologies such as modulation and signal encoding schemes is a plus
Understanding of IP networking and/or distributed systems is a plus
Experience working with low-level hardware components is a plus

Benefits

Comp & perks

Remote work available
Opportunity to switch from Layer1 to other software engineering areas as interests and business needs evolve
Supportive and growth-oriented culture
Working hours agreed in advance with the team manager