# George Korolev

George Korolev is a remote worker on Himalayas, Senior Backend Engineer at MMDSMART, based in Germany.

Source: https://himalayas.app/@georgekorolev

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

| Detail | Value |
| --- | --- |
| Availability | Looking for a job |
| Location | Germany |
| Authorized to work in | Germany |
| Salary expectations | 100k+ USD |
| Job categories | Backend Engineer |
| Skills | Go, Distributed Systems, Temporal, Kafka, Event Driven Architecture, Microservices, OpenFGA, Keycloak, OpenID Connect, HSMs, PKCS11, Multi Sig Implementations, Blockchain, gRPC, Protocol Buffers |
| LinkedIn | https://linkedin.com/in/george-korolev-dev |
| GitHub | https://github.com/zheorgyan |

## About

```text
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

### Senior Backend Engineer (current)

MMDSMART. Aug 2025 - Present

```text
Closed a data-consistency gap against an external billing system with snapshot-based compensation and a daily Temporal reconciliation workflow. Designed and built a new Go microservice with REST and GraphQL APIs, and led a migration of the routing destination model across six repositories.
```

Skills: Go, NodeJS, TypeScript, React, MongoDB, Kafka, Avro, Schema-Registry, Temporal, GraphQL, gqlgen, Redis, Keycloak, OIDC, OpenFGA, Docker, Kubernetes, GCP

### Senior Backend Developer

Sendcloud. Oct 2023 - Aug 2025

```text
Drove migration from synchronous REST to event-driven architecture using AWS SNS/SQS and NATS. Redesigned PostgreSQL schemas and indexes, set up observability stack, and helped decompose a monolithic service into microservices.
```

Skills: Go, Gin, Echo, Sqlx, PostgreSQL, NATS, Kafka, Redis, Docker, Kubernetes, AWS, Amazon-EKS, RDS, S3, SNS, Amazon-SQS

### Backend Engineer

GCMETCH. Feb 2022 - Oct 2023

```text
Architected multi-chain custody core with Go blockchain-abstraction layer. Built HSM-backed transaction signing with M-of-N multi-signature approval and role-based approval workflow with immutable audit trail.
```

Skills: Go, gRPC, Protobuf, PostgreSQL, Redis, Kafka, NATS, Go-Ethereum, Btcsuite, Gotron-Sdk, HSMs, PKCS11, Keycloak, OIDC, OpenTelemetry

### Web Developer

BizApps Ltd. Jun 2020 - Feb 2022

```text
Designed a Go task scheduler on worker pools and channels running 5K+ concurrent automation tasks. Implemented distributed state synchronization with etcd and built a loss-resilient NATS message pipeline.
```

Skills: Go, Gin, Sqlx, NATS, Etcd, Gorilla, WebSockets, PostgreSQL, Redis, Prometheus, GCP, Cloud-Run, GKE, Pub-Sub

### Backend Developer

United Metallurgical Company. Mar 2017 - Jun 2020

```text
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.
```

Skills: C#, .NET-Framework, .NET-Core-2.1, ASP.NET-MVC, WPF, Pl-SQL, LINQ

## Education

### Confluent

Confluent Certified Data Streaming Engineer, Data Streaming

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

## Tech stack

- Blockchain
- Kubernetes
- Helm
- GitHub Actions
- GitLab CI
- Debezium
- MySQL
- PostgreSQL
- MongoDB
- Node.js
- .NET
- Redis
- React
- C#
- Go
- Go Ethereum
- Kafka
- RabbitMQ
- Fastify
- Echo
- Grafana
- Prometheus
- OpenTelemetry
- etcd
- GraphQL
- NATS
- gRPC
- Avro
- TypeScript
- Keycloak
- Docker
- Jaeger
- Temporal
- OpenFGA
- ASP.NET MVC
- AWS

To contact George, message them from this profile with a Himalayas employer account: [Hire on Himalayas](https://himalayas.app/hire).

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