Romain Lenglet
Owner at DonePoint
San Jose, California, United States
Summary
🤩
Rockstar🎓
Top SchoolRomain Lenglet is a seasoned cloud-native networking and security architect with 17 years of experience designing and shipping high‑scale distributed systems across startups and tech giants. Based in San Jose, he’s led product and engineering teams (VP/Chief Product Officer/Chief Architect) and now runs DonePoint as a fractional architect and startup advisor focused on cloud, networking, security, and product strategy. A core contributor and system architect on the high-profile Cilium project, he has deep hands‑on expertise with eBPF datapaths, observability, and performance optimizations, and has also improved build and release automation for Istio at scale. His background spans network virtualization and cloud IaaS at Oracle, VMware/Nicira and Midokura, plus service‑mesh security leadership at Google where he managed multiple Istio releases and prototyped a next‑gen network datapath. He pairs a PhD in computer science with an MBA and an unusual combination of research pedigree, patent‑level innovation, and practical production experience delivering 99.999% availability systems.
16 years of coding experience
21 years of employment as a software developer
M.S (Engineer Diploma), Computer Science, M.S (Engineer Diploma), Computer Science at National School of Computer Science and Applied Mathematics of GrenobleAdvanced Communicator Bronze, Advanced Leader Silver, Public Speaking, Leadership, Advanced Communicator Bronze, Advanced Leader Silver, Public Speaking, Leadership at Toastmasters InternationalMaster of Research, Computer Science, Master of Research, Computer Science at Université Grenoble AlpesMaster of Business Administration (M.B.A.), Business Administration and Management, General, Master of Business Administration (M.B.A.), Business Administration and Management, General at Santa Clara University Leavey School of BusinessPh.D, Computer Science, Ph.D, Computer Science at Grenoble INP - UGA
English, French
Github Skills (29)
service-mesh10
kubernetes10
docker10
system-programming10
ebpf10
ip10
c1110
networking10
dockers10
cicd10
iptables10
c1710
build-engine10
automation10
go10
Programming languages (13)
Github contributions (5)
cilium/cilium
May 2017 - May 2020
eBPF-based Networking, Security, and Observability
Role in this project:
Back-end Developer & System Architect
Back-end Developer & System ArchitectContributions:191 PRs, 684 pushes, 186 branches in 3 years
Contributions summary:Romain focused on optimizing the performance and efficiency of the Cilium monitor, specifically related to eBPF-based networking. They implemented new methods for encoding and decoding monitoring metadata to reduce memory usage. The user also made significant changes to the core of the data path, including the introduction of tracing capabilities to provide richer information about forwarded packets. Additionally, the user extended the access log record format and worked on ensuring that both metadata and payload buffers are fully processed.
bpfcontainerskerneltroubleshootingkubernetes-networking
istio/istio
Apr 2018 - Sep 2020
Connect, secure, control, and observe services.
Role in this project:DevOps Engineer
DevOps EngineerContributions:46 reviews, 41 commits, 68 PRs in 2 years 5 months
Contributions summary:Romain's contributions primarily focused on enhancing the build and release processes of the Istio project. They made significant changes to the build system, including the addition of a "make dev-shell" target and fixing issues with Helm chart versions in daily builds. The user also addressed release script issues related to Istio CNI Helm charts. Furthermore, they implemented optimizations to the build process, such as limiting the scope of iptables-restore/save commands.
circuit-breakerenforce-policiesistioapi-managementmicroservice
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