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Dmitriy Gerasimov

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Dmitriy Gerasimov

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Sep 13

The API Contract Nobody Owned

A field report on API-first: how one team crawled from API chaos through a generated spec to a real contract, and what each stage cost.

The API Contract Nobody Owned

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ITNEXT

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Dmitriy Gerasimov

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Sep 20

MapStruct — Nothing Falls Through

Strict object mapping with MapStruct on JDK 25: every time data changes hands between layers, the compiler should prove that nothing was…

MapStruct — Nothing Falls Through

Dmitriy Gerasimov

·

Sep 4, 2025

Proxmox upgrade from 8x to 9x

When we kicked off our on-prem project, the goal was clear: build a server with the basic features of a cloud environment — but…

Proxmox upgrade from 8x to 9x

Dmitriy Gerasimov

·

Feb 10, 2024

Java: BigDecimal for monetary settlements

I am currently developing a system for accepting credit/debit card payments and processing SEPA transactions. I am working with the Euro…

Java: BigDecimal for monetary settlements

Dmitriy Gerasimov

·

Feb 6, 2024

Converting VM image to Docker container

Convert a Linux server or virtual machine into a Docker container.

Converting VM image to Docker container

Dmitriy Gerasimov

·

Feb 5, 2024

Solving the XML response problem with jackson-dataformat-xml

Solving the problem of jackson-dataformat-xml when it changing the default response from JSON to XML.

Solving the XML response problem with jackson-dataformat-xml

Dmitriy Gerasimov

Dmitriy Gerasimov

Head of AI @ payments fintech. Principal platform engineer. I write about AI adoption, platform engineering and JVM modernization in regulated environments.

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