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Freelance
2024-11 – present: SRE/DevOps/SWE Consultant
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PayPay株式会社, Tokyo, Japan
2022-04 – 2024-11: SRE Tech Lead
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Division-wide migration from New Relic to self-hosted metrics, alerting
and tracing system based on Victoria Metrics, Grafana, OpenTelemetry and
ClickHouse. Increased metrics resolution by 6x and improved trace
reliability, while reducing yearly cost by 80%
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Maintenance and redesign of logging pipelines. Reduced the number of lost
logs to zero, and made the entire system significantly cheaper by
simplifying its architecture
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iconicchain Oy
2021-01 – 2022-03: Head of DevOps and Security
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Building infrastructure (Hetzner cloud), supporting development (eg.
creating tools to run dev workloads in hcloud), optimizing deliveries and
Docker image builds, building CI/CD & improving test performance
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Siili One Oy
2019-12 – 2020-12: Staff SRE
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Consultant; technical lead on an embedded Linux system project for a
customer in the telecommunications industry
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Tuxera Inc.
2017-04 – 2019-12: Release Engineer
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Development and maintenance of online build service used by customers,
400k–600k kernel module builds delivered per year
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Aalto University Department of Computer Science and Engineering
2009-05 – 2011-05, 2011-09 – 2017-03: Systems Designer
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Unix (Solaris, illumos, Linux, OpenBSD) server and workstation
administration. Xen and KVM virtualization, illumos zones (containers)
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Building and upgrading internal systems, migrating from legacy
solutions. Examples:
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LDAP authentication and name services
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Puppet configuration management for workstations and servers
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Redundant firewalls with pfsync and CARP
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Improving processes and workflows, eg. putting everything under version
control, deploying an issue tracker