Kobayashi Issa, Senior Software Engineer

Description

Software engineer specialized in Blockchain and distributed systems with X

years of experience designing and implementing secure, scalable backend and

Web3 solutions. Skilled in smart contract development (Solidity, Rust, etc.),

blockchain integration, and cloud-native microservices, with a strong

background in cryptography, security, and high-reliability systems.

Seeking to contribute to a Japanese fintech or Web3 product team building

production-grade blockchain platforms for global users.

Languages

English
Native or bilingual

Workplace preferences

Remote only

Primarily works remotely

bitFlyer
Senior Blockchain Engineer
June 2021 - June 2025 (4 years)
Tokyo, Japan
Developed and maintained backend services in Go and Node.js for
Japan’s leading crypto exchange trading and wallet systems,
handling peak loads of X,000 orders per second
 Implemented and optimized on-chain and off-chain settlement logic
for BTC/ETH pairs, reducing latency by X% and improving system
reliability.
 Contributed to custody and cold-wallet operation tooling, improving
internal operational efficiency and security.
 Collaborated with compliance and security teams to meet FSA
regulations for crypto asset exchanges in Japan.
Ethereum React.js Backend Service Development Software Architecture Python
Soramitsu,
Software / Blockchain Engineer
April 2018 - May 2021 (3 years and 1 month)
Designed and implemented smart contracts for CBDC and enterprise payment
PoCs using custom blockchain frameworks and Hyperledger-based solutions.
 Implemented backend indexing services and APIs for on-chain game assets,
supporting more than X00,000 on-chain items.
 Participated in performance tuning, reducing transaction processing time by X%
and improving node reliability.
 Worked with cross-functional teams (Japanese and international) following
Scrum, delivering features in 2-week sprints.

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Bachelor of Science
International Professional University of Technology
2016