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Andrey Ushakov

@andreyushakov

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Senior Backend Engineer at Oskon.tech building Kotlin and Java services for an AI-powered chatbot.

Portugal

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At Oskon.tech, I develop and maintain Kotlin and Java backend services for an AI-powered chatbot, including REST APIs and chat-history persistence in Google Firestore. I also contribute to integrations with LLM-powered chat and other GCP services.

Previously, I contributed payment features to OnTarget Group’s production point-of-sale application and developed Java microservices and APIs at BeaverIT and EPAM Systems. At EPAM Systems, I initiated and drove a migration from JDBC to Spring Data.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Oskon.tech

Nov 2025 - Present (11 months)

Develops and maintains scalable backend services and REST APIs for an AI-powered chatbot using Kotlin, Java, Spring Boot, and reactive programming. Implements chat-history persistence in Firestore and contributes to LLM integrations, JWT authentication, RBAC, caching, and CI/CD.

Java Kotlin Spring Boot Spring Security Spring WebFlux (Reactive)GCP Firebase Firestore REST OpenAPI Docker GitLab CI CD Junit Mockito Cucumber SonarQube

Software Engineer

OnTarget Group

Sep 2022 - Oct 2025 (3 years 1 month)

Contributed to a production point-of-sale application for supermarket and gas-station chains, designing payment-system features and planning migration from SQL stored procedures to Elasticsearch. Worked with AWS for infrastructure and deployment.

Java Spring Boot PostgreSQL Elasticsearch AWS Git

Java Software Engineer

BeaverIT

Aug 2021 - Sep 2022 (1 year 1 month)

Developed backend microservices with Java 11 and Spring Boot, created APIs for an educational platform, and built a proof-of-concept frontend. Designed Jenkins CI/CD pipelines and used Kubernetes for deployments.

Java 11 Spring Boot PostgreSQL MySQL Hibernate REST Jenkins Kubernetes Git

Java Software Engineer

EPAM Systems

Feb 2019 - Jul 2021 (2 years 5 months)

Developed backend modules with Java and Spring Boot in a microservices architecture, drove migration from JDBC to Spring Data, and created Telegram bot integration. Authored over 90% of unit tests and deployed containerized applications with Kubernetes.