Principal Software Engineer

Fujitsu Limited; Bengaluru; On-site; INR 6,000,000 - 9,000,000; Full time

Job summary

1Finity, a Fujitsu company, is seeking a Principal Software Engineer with deep expertise in RDMA/NIC technologies, L2/L3 networking, and Linux-based packet processing. You will lead architecture, design, debugging and release readiness for complex networking software.

The role requires hands-on experience across server-side and network-side technologies, strong problem solving, and the ability to mentor engineers while driving technical solutions with cross-functional teams.

Qualifications

• 12+ years of relevant software/networking engineering experience.
• Bachelor's or Master's degree in Computer Science, Electronics, or Electrical Engineering.
• Experience leading/mentoring engineers.
• Hands-on RDMA/NIC and Linux packet processing experience.

Responsibilities

• Design, develop and support RDMA/NIC and networking software.
• Lead architecture discussions and code reviews.
• Debug datapath across Linux, NICs and ASIC layers.
• Coordinate with cross-functional teams for releases.
• Analyze field issues and perform root-cause analysis.

Skills

C/C++

Linux development

Networking

Problem solving

Technical leadership

Education

Bachelor's or Master's in CS/EE

Tools

Broadcom/Marvell ASICs

RDMA/NIC technologies

Job description

Location Flexibility: Primary Location Only

Posting Start Date: 10/23/26

1Finity, a Fujitsu company, is a global provider of communications networks for our connected world. We uniquely combine technological leadership and expertise in open optical and wireless networking, network automation, and applied AI/ML to design, build, operate, and maintain critical digital communications network infrastructure. Collaborating closely with ecosystem partners, we deliver transformative outcomes for service providers and network operators, and enable them to lower TCO, improve network performance, and increase energy efficiency.

Job Summary

We are looking for an experienced Principal Software Engineer with strong expertise in RDMA/NIC technologies, L2/L3 networking, Linux-based packet processing, and network datapath debugging. The role requires hands‑on technical experience across server‑side and network‑side technologies, along with the ability to troubleshoot complex networking and platform issues.

The ideal candidate will bring strong architecture and development experience and be comfortable providing technical leadership across design, development, debugging, testing and product stabilization.

Key Responsibilities

• Design, develop and support RDMA/NIC and networking software solutions.
• Work on server-side and network-side technologies, including RDMA/PSNIC related development.
• Contribute to architecture, design, implementation, code reviews and technical problem-solving.
• Develop and debug networking functionality across L2/L3 switching and packet‑processing paths.
• Troubleshoot complex datapath and network issues across software, Linux and ASIC layers.
• Work on feature development, unit testing, integration, build stabilization and release readiness.
• Analyse field/customer issues and perform detailed root‑cause analysis.
• Debug areas such as traffic loss, VLAN tagging, MAC/FDB learning, QoS and packet Rx/Tx paths.
• Collaborate with cross‑functional engineering teams across networking, platform and server‑side technologies.
• Provide technical guidance and mentoring to engineers and drive technical solutions for complex problems.

These responsibilities closely reflect Mahalakshmi Sivanpillai 's actual architecture, development, debugging, stabilization and mentoring experience. [Offer Prop...e Engineer | Outlook]

Required Technical Skills

Networking

• Strong knowledge of L2/L3 networking
• VLAN / PVLAN
• Switching and Ethernet technologies
• QoS
• DHCPv4 / DHCPv6
• SNMP
• MAC/FDB learning and aging

RDMA / NIC

• Server-side networking
• RDMA software/shim layers
• RDMA integration and testing

System & Datapath

• Rx/Tx packet paths
• DMA
• TCAM / Exact Match

ASIC / Platform

• Experience with network ASICs
• Broadcom and/or Marvell experience is desirable
• Chassis/stacking and networking platform experience

Her resume explicitly lists these areas, including Broadcom/Marvell ASIC programming, Linux packet drivers, DMA, TCAM/Exact Match, FDB/MAC learning, QoS and Rx/Tx debugging. [Offer Prop...e Engineer | Outlook]

Programming Skills

• Strong hands‑on experience in C/C++
• Debugging complex software and system‑level issues
• Experience with Linux‑based development environments
• Experience developing networking or datacom products.
• Exposure to RDMA/NIC technologies.
• Experience with enterprise or data‑center switching platforms.
• Experience debugging networking ASICs and packet‑processing pipelines.
• Strong problem‑solving and root‑cause‑analysis capabilities.
• Experience technically leading/mentoring engineers.
• Ability to work across server, network and platform engineering teams.

Experience / Education

• 12+ years of relevant software/networking engineering experience, with significant hands‑on technical depth.
• Bachelor's or Master's degree in Computer Science, Electronics, Electrical Engineering or a related engineering discipline.