Java developer

DMYTRO LEMESHCHENKO

Java Backend Developer

Odesa, Ukraine (Remote)

dimmonishe@gmail.com

www.linkedin.com/in/dmitrii-lemeshchenko/

+380634164161

t.me/dimmonishe

PROFESSIONAL SUMMARY

Results-oriented Java Backend Developer with 3+ years of commercial experience, specializing in the Fintech sector. Proven track record in designing and maintaining high-load, microservice-based Payment Service Provider (PSP) infrastructures. Expert in building secure, scalable systems with a deep understanding of data privacy, encryption, and financial regulations (PCI DSS certified).

TECHNICAL SKILLS

• Core: Java 11/17/21, OOP, SOLID, GRASP.

• Frameworks: Spring Boot , Spring Security/Web/MVC/Data, Hibernate, JPA, Servlet API.

• Databases : PostgreSQL, MySQL, MongoDB, H2, PGVector.

• Architecture & Integrations : Microservices, REST APIs, Kafka, RabbitMQ, AWS, Google Cloud Services.

• Tools & DevOps: Git, GitHub/GitLab , Maven, Gradle , Docker , Linux, Swagger, Flyway, Liquibase, Postman.

• Testing: JUnit, Mockito.

WORK EXPERIENCE

Java Software Developer | Asquad | Feb 2025 – Present

• Engineered and optimized secure payment modules for a complex Payment Service Provider (PSP) infrastructure, ensuring 100% compliance with financial security standards.

• Successfully maintained and scaled microservices handling sensitive financial data (PostgreSQL, MongoDB, Kafka, RabbitMQ), ensuring high availability and system resilience.

• Streamlined internal team workflows and CI/CD collaboration, resulting in a 15% increase in development velocity over a six-month period.

Java & Kotlin Developer | Change the World (Startup) | May 2023 – Feb 2025

• Built robust backend architecture for "Rate Me" and "Watch for Ukraine" Android applications.

• Integrated AWS for secure storage; utilized Kotlin/Java to ensure seamless communication with Jetpack Compose UI.

• Developed monetized ad-revenue infrastructure to support volunteer funds.

Java Backend Developer | UWP Digital | Sep 2023 – Mar 2024

• Deployed robust Java applications to parse high volumes of open-source data.

• Trained and integrated a ChatGPT-4 model utilizing PGVector for advanced data processing.

• Architected a scalable, multilingual online support service using AWS and GCP.

EDUCATION

• Mate Academy: Java Software Developer Courses (2022)

• Odessa State Academy of Refrigeration: Master's Degree (2003)

LANGUAGES

• English: Upper-Intermediate

• Ukrainian: Native

• Russian: Native