Hiroki Sakamoto
Software Engineer at Woven by Toyota
Tokyo, Japan
Summary
👤
Senior🎓
Top SchoolHiroki Sakamoto is a software engineer with 11 years of experience building low-latency, large-scale backend systems and infrastructure across cloud-native environments. He has designed and operated distributed databases and logging platforms that handle terabytes per day and billions of metrics, delivering production-grade reliability (including Multi-AZ HA and 99.999% uptime) and substantial cost savings. Skilled in Go and Rust, Kubernetes, Kafka, Cassandra, Elasticsearch and observability tooling, he combines hands-on implementation with performance tuning (pprof, OpenTelemetry) to hit tight p99 SLAs. Hiroki is an active open-source contributor to Grafana Loki, adding recovery, series API and Kafka auth features that improved upstream log ingestion and resiliency. He’s equally comfortable mentoring junior engineers and defining platform SDKs and operators that standardize observability and reduce operational overhead. Based in Tokyo, he brings a pragmatic systems mindset that turns complex distributed requirements into verifiable, cost-efficient production systems.
11 years of coding experience
10 years of employment as a software developer
Master of Information Science, Information Science, Master of Information Science, Information Science at JAISTBachelor of Engineering, Computer Science, Bachelor of Engineering, Computer Science at WASEDA University
English, Japanese
Stackoverflow
63reputation
9kreached
0answers
1question
Github Skills (13)
kafka10
go10
backend10
back-end-development10
grpc9
logging9
prometheus8
cloud-native8
caching6
redis6
spring6
spring-boot6
java6
Programming languages (8)
Github contributions (5)
grafana/loki
Sep 2021 - Dec 2021
Like Prometheus, but for logs.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:7 reviews, 10 commits, 12 PRs in 2 months
Contributions summary:Hiroki contributed to the Loki project by implementing features related to ingester recovery, series API, and gRPC error handling. They also added support for Kafka authentication methods such as mTLS, SASL/PLAIN, and SASL/SCRAM. Furthermore, they exposed Kafka message keys in labels and refactored tests for file target functionality.
logginglokigrafanaprometheuscloudnative
taisho6339/rs-raft
Dec 2022 - Dec 2022
Contributions:50 commits, 35 pushes, 1 branch in 13 days
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