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George KorolevGK
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George Korolev

@georgekorolev

Senior Backend Engineer at MMDSMART building Go services, including a routing editor serving 18% of API traffic.

Germany
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At MMDSMART, I built a Go microservice end to end, from its domain model and MongoDB persistence to REST and GraphQL APIs with fine-grained authorization. I also introduced schema-first code generation to keep contracts aligned across three repositories.

I closed a data-consistency gap with an idempotent Temporal reconciliation workflow and diagnosed a production failure caused by an undocumented third-party billing API limit. I also own the routing schema editor across the Go gateway, Fastify service, and React UI; its preview endpoint handles about 18% of API traffic.

At GCMETCH, I architected a multi-chain custody core and built HSM-backed transaction signing with M-of-N approval and an immutable audit trail. The chain abstraction supported Bitcoin, Ethereum/USDT, and Tron without changes to core signing or approval logic.

At BIZAPPS LTD, I designed a Go scheduler that ran 5K+ concurrent automation tasks and implemented distributed state synchronization across 50+ agent nodes. I’m a Confluent Certified Data Streaming Engineer, with experience in Go, Kafka, Temporal, and financial and messaging platforms.

Experience

Work history, roles, and key accomplishments

UC

Backend Developer

United Metallurgical Company

Mar 2017 - Jun 2020 (3 years 3 months)

Developed and supported information systems including stored procedures, client communication, and UX/UI prototyping. Contributed to MES systems and built a first-level process control equipment management system.

Education

Degrees, certifications, and relevant coursework

CO

Confluent

Confluent Certified Data Streaming Engineer, Data Streaming

Earned the Confluent Certified Data Streaming Engineer certification, demonstrating expertise in Kafka and data streaming technologies.

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