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[відкрити контакти](див. вище в блоці «контактна інформація») Andrii Kalashnyk
[відкрити контакти](див. вище в блоці «контактна інформація») Staff Java Software Engineer | AI-Driven Engineering
kalashnyk (LinkedIn) Ukraine

Top Skills Summary
Artificial Intelligence (AI) Staff Java Engineer with 10+ years of experience building and operating
Java distributed backend systems. Worked on a multi-brand SMS marketing platform
Spring processing millions of messages, including messaging pipelines, card payments,
KYC verification, and third-party integrations. Designed an AI-driven engineering
Languages workflow spanning implementation, review, testing, and CI/CD, and built an MCP
layer exposing product capabilities to Claude, ChatGPT, and other LLM clients.
Ukrainian Core technologies include Java, Spring, Hibernate, MySQL, PostgreSQL,
English Elasticsearch, RabbitMQ, Hazelcast, and GCP.
Russian

Certifications Experience
EFSET English Certificate - Score: Innovecs
77/100, Proficient (CEFR C2) Staff Java Software Engineer
July 2020 - July 2026
Kyiv City, Ukraine
High-volume SMS/text-marketing platform serving businesses in the US and
Canada - multi-brand architecture, billing and payments, and messaging
pipelines.

Highlights:

- Implemented an AI-driven development cycle spanning code generation, code
review, testing, and CI/CD control through Claude Code, Jenkins, and TeamCity.
- Built an MCP layer that made product capabilities natively accessible from
Claude, ChatGPT, and other AI assistants.
- Led development of KYC verification flows.
- Integrated third-party REST services and developed platform features across
billing, notifications, and account management.
- Maintained and improved existing features across a multi-service backend.

Technologies: Java, Spring, Hibernate, MySQL, Elasticsearch, RabbitMQ,
Hazelcast, GCP, Claude Code, MCP

Daxx Software Development Teams in Ukraine
Senior Java Software Engineer
August 2017 - July 2020
Logistics/integration project.

Responsibilities:

- Integrated third-party REST, SOAP, and FTP services.
- Implemented new platform features.
- Maintained and improved existing features.

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Technologies: Spring, Hibernate, ActiveMQ, ServiceMix, CXF, Camel Routes,
MySQL, Cassandra, Elasticsearch

MDsoft
Java Engineer
January 2017 - September 2018
Kyiv
Freelance project for a Ukrainian customer: developed a full-stack automotive
spare-parts warehouse management system in an Agile/Scrum environment.

Responsibilities:

- Designed the project architecture.
- Implemented backend and frontend functionality.
- Communicated directly with the customer.

Technologies: REST, Spring, Angular, PostgreSQL

EngagePoint, Inc.
Java Engineer
February 2016 - July 2017
EngagePoint Financials is a multi-program financial transaction and
payment-processing system supporting bookkeeping at program, agency,
stakeholder, citizen, and household levels, as well as payment collection and
disbursement.

Responsibilities:

- Developed the budget module for the Financials system (EJB, Hibernate, JSF,
SOAP).
- Developed the member portal, a separate user-facing application (Spring,
Hibernate, SOAP, REST, Angular).

Sinko
C Developer
October 2015 - February 2016
Developed firmware for Atmel microcontrollers (ATtiny, ATmega) in C/AVR using
IAR Embedded Workbench, Atmel Studio, and CodeVisionAVR. Built a Java
desktop application for controlling microcontrollers over USB.

Education
Kherson State University
Master's Degree, Computer Science - (September 2024 - December 2025)

National University of Food Technology
Bachelor's Degree, Computer Science - (2011 - 2015)

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