Masahiko Sawada
Senior Software Development Engineer at Amazon Web Services (AWS)
Greater Seattle Area United States
Summary
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RockstarMasahiko Sawada is a Senior Software Development Engineer with 12 years of deep expertise in PostgreSQL internals, currently building database solutions at AWS while serving as a long-standing committer and major contributor to the PostgreSQL Global Development Group. He has driven core feature development, bug fixes, and patch reviews across companies like EDB, 2ndQuadrant, and NTT, and contributed key improvements to well-known tools such as pg_repack. Practical and detail-oriented, he specializes in replication, vacuuming, distributed transactions, and minimizing locking for live table reorganization. His work blends production-grade engineering with open-source stewardship—he not only implements fixes but also shapes how the community maintains database consistency across versions. Based in the Greater Seattle Area, he pairs systems-level expertise with hands-on backend development to solve high-impact operational challenges.
12 years of coding experience
6 years of employment as a software developer
Github Skills (10)
c1710
databases10
postgresql10
c1110
sql10
performance-optimization10
database-design10
database10
indexing9
database-administration9
Programming languages (8)
Github contributions (5)
reorg/pg_repack
Jan 2017 - Oct 2018
Reorganize tables in PostgreSQL databases with minimal locks
Role in this project:
Backend Developer / Database Engineer
Backend Developer / Database EngineerContributions:3 reviews, 59 commits, 36 PRs in 1 year 9 months
Contributions summary:Masahiko primarily contributed to the backend of the `pg_repack` repository, focusing on enhancing the PostgreSQL table reorganization tool. Their work included adding support for newer PostgreSQL versions, modifying trigger types for improved data consistency, and refactoring trigger names. Furthermore, the user implemented options for controlling backend behavior during exclusive lock timeouts and enhanced the codebase by addressing various bugs and code issues.
postgresql-database
MasahikoSawada/postgresql
May 2015 - Dec 2022
PostgreSQL project
Contributions:1018 commits, 1 PR, 1192 pushes in 7 years 8 months
postgresql
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