Senior Software Engineer – Layer1, C++

Arista Networks

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

Posted 9/23/2026full-timeRemote • IrelandSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in software development for physical network layers, utilizing C, C++, and Python to design and implement features. Capable of providing technical leadership and mentoring while collaborating with cross-functional teams to bring Layer1 components to market.

Highest-signal resume keywords

C ProgrammingC++ ProgrammingPython ProgrammingTechnical LeadershipSoftware Troubleshooting

ATS Keywords

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Hard Skills

Software DevelopmentControl SoftwareAutomated TestingFeature DevelopmentDigital Communication TechnologiesIP NetworkingDistributed SystemsLow-Level Hardware InteractionSoftware Engineering PrinciplesProblem-Solving

Soft Skills

MentoringTeam CollaborationCustomer InteractionProject Ownership

Tools & Technologies

UNIXLinux

Industry Keywords

Physical Network LayerForwarding EnginesTelemetry ToolsOptics StandardsLink Health Monitoring

Tech Stack

Tools & technologies

Distributed SystemsLinuxPythonUnixC++

About the role

Key responsibilities & impact

Develop software managing the physical network layer, from 1GBASE-T connectors to 1.6T long-reach optics
Write control software across forwarding engines, connectors, and gearbox interface chips
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
Add new features, debug problems, and tune code for scalability and performance
Own projects from definition through deployment and customer interactions
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 Layer1 components to market
Collaborate with hardware engineers on software control interfaces
Provide technical leadership across features, projects, and tools
Analyze and fix problems in customer networks and system tests
Mentor new and junior engineers

Requirements

What you’ll need

BS in Computer Science, Electrical Engineering, or Computer Engineering plus 8 years of experience, or MS plus 6 years, or Ph.D. plus 3 years, or equivalent work experience
Expert knowledge of C or C++ and Python
Knowledge of UNIX or Linux
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
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

Benefits

Comp & perks

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