Vladislav Nastyushenko

Backend • Senior • Saint Petersburg, Russia • UTC+03:00 • In office, Partially remote, Fully remote • Work permits: Russia • English: B1 • Available in 2 weeks

Java Developer

4+ years exp

Java

SQL

Kotlin

Data Layer & Database: 6/10

API Design: 5/10

Scalability & Performance: 5/10

Invite to interview

Download CVCV

Overview

Technical skills

Timeline

Roles

Overview

Backend Java developer at a Senior level focused on building Spring Boot REST APIs with transactional data access and concurrency controls. The strongest proven skill is custom JPA repository design and explicit DB locking as implemented in document-service/src/main/java/com/itq/model/repository/impl/DocumentRepositoryImpl.java. Public code does not show production-grade CI/CD or secret management practices, and there is a security weakness where a default admin password is created and logged.

Phone

Technical skills

Languages

Java

SQL

Kotlin

Java

Hibernate

Spring Boot

Spring Data JPA

Testcontainers

Lombok

Maven

Liquibase

Databases

PostgreSQL

Redis

Apache Kafka

DevOps

Docker

Git

Rest API

CI/CD

Other

Mockito

JUnit

Spring Security

ElasticSearch

Kubernetes

MapStruct

Grafana

GitLab CI

Prometheus

Spring Framework

Firebase

Timeline

Java Developer • Middle

Reksoft • Full-Time

Feb 2025 to Present 1 Year 8 Months Saint Petersburg Partially remote

Developed a billing module for a platform, focusing on fault-tolerant rating, payment processing, and product/service access control. Designed the billing database schema and implemented idempotency using Redis and PostgreSQL. Built an async payments flow with Kafka, including producer/consumer event exchange, and helped split billing from a monolith using strangler and blue-green deployment. Set up monitoring and centralized logging, and supported containerized delivery with Docker, Kubernetes, and CI/CD.

Java

Spring Boot

Spring Data JPA

Spring Security

Apache Kafka

PostgreSQL

Redis

Liquibase

JUnit

Mockito

Testcontainers

Maven

GitLab CI

Docker

Kubernetes

Prometheus

Grafana

ElasticSearch

MapStruct

Lombok

Java Developer • Middle

I-Teco • Full-Time

Dec 2022 to Jan 2025 2 Years 1 Month Moscow Partially remote

Built an integration gateway for a retail network connecting an e-commerce store, 1C, and WMS. Implemented asynchronous order, stock, price, and status synchronization using Kafka with idempotency safeguards. Designed PostgreSQL data models, implemented an outbox-based event delivery mechanism with retry handling, and developed REST APIs for order ingestion with validation and enrichment. Containerized the service with Docker, managed DB migrations with Liquibase, and added integration tests covering database and external API interactions.

Java

Spring Boot

Spring Data JPA

Hibernate

PostgreSQL

Redis

Apache Kafka

Rest API

Maven

Git

JUnit

Mockito

Testcontainers

Docker

Liquibase

Altai State University

Bachelor's Degree • Software Engineering

2024 Barnaul, Altai Krai

Senior Backend Developer Confidence: Medium API Engineer

API Design

5/10

How well APIs are designed

APIs show versioning, pagination, filtering and a consistent error response pattern, but lack explicit idempotency keys and advanced API stability mechanisms.

Evidence

WhiteVisnuPirat/computer-shop-api/src/test/java/com/computershop/integration/ProductControllerIntegrationTest.java WhiteVisnuPirat/computer-shop-api/src/main/java/com/computershop/service/ProductService.java WhiteVisnuPirat/computer-shop-api/src/main/java/com/computershop/exception/GlobalExceptionHandler.java

Data Layer & Database

6/10

Working with databases

Data layer includes custom JPA repository implementations, careful pagination/count queries and explicit pessimistic locking, showing deliberate DB-level decisions and transaction usage.

Evidence

WhiteVisnuPirat/document-service/src/main/java/com/itq/model/repository/impl/DocumentRepositoryImpl.java WhiteVisnuPirat/document-service/src/main/java/com/itq/service/DocumentService.java

Scalability & Performance

5/10

Handling load and speed

There are caching and cache eviction annotations, retry with backoff, and scheduled worker components; overall scalability patterns exist but lack measured tuning or advanced invalidation strategies.

Evidence

WhiteVisnuPirat/computer-shop-api/src/main/java/com/computershop/service/ProductService.java WhiteVisnuPirat/document-service/src/main/java/com/itq/service/worker/SubmitWorker.java WhiteVisnuPirat/document-service/src/main/java/com/itq/service/worker/ApproveWorker.java

System Architecture

4/10

Overall system structure

Code is reasonably modular with clear service/repository/controller separation and background workers, but there is limited evidence of cross-service contracts, config/secret management, or documented service decomposition rationale.

Evidence

WhiteVisnuPirat/computer-shop-api/src/main/java/com/computershop/service/ProductService.java WhiteVisnuPirat/document-service/src/main/java/com/itq/service/DocumentService.java WhiteVisnuPirat/document-service/src/main/java/com/itq/cli/DocumentGeneratorCli.java

Security & Auth

5/10

Protecting data and access

Authentication is implemented with JWT and a request filter, and DTOs use validation, but there are unsafe practices (e.g. logging a default admin password) and no clear token revocation strategy.

Evidence

WhiteVisnuPirat/computer-shop-api/src/main/java/com/computershop/security/JwtAuthenticationFilter.java WhiteVisnuPirat/computer-shop-api/src/main/java/com/computershop/service/AuthService.java WhiteVisnuPirat/computer-shop-api/src/main/java/com/computershop/dto/request/LoginRequest.java

Reliability & Observability

4/10

Stability and monitoring

Good use of retries, transactional boundaries and logging; observability is basic (logs, tests) but lacks structured tracing, correlation ids, timeouts across calls and advanced resilience patterns.

Evidence

WhiteVisnuPirat/computer-shop-api/src/main/java/com/computershop/service/ProductService.java WhiteVisnuPirat/document-service/src/main/java/com/itq/service/ConcurrencyTestService.java

Expertise

Java• Middle

Microservices & API Architecture• Middle

Databases & Vector Storage• Senior

Industries

Commerce• Middle

Technologies

Java• since 2022 • Senior

Kotlin

SQL

PostgreSQL• since 2022

Redis• since 2022

Rest API• since 2022

Spring Framework

Maven• since 2022

Spring Boot• since 2022

Hibernate• since 2022

Prometheus• since 2025

GitLab CI• since 2025

CI/CD• since 2022

Mockito• since 2022

Git• since 2022

Docker• since 2022

Kubernetes• since 2025

ElasticSearch• since 2025

Apache Kafka• since 2022

Grafana• since 2025

Spring Data JPA• since 2022

Spring Security• since 2025

Lombok• since 2025

MapStruct• since 2025

Testcontainers• since 2022

Liquibase• since 2022

Recommendations

Develop new Spring Boot REST APIs that require custom database queries, pagination and locking (use DocumentRepositoryImpl as a pattern).
Implement concurrency-sensitive features such as approval flows or batch processing where transactions and pessimistic locking are required (use the ConcurrencyTestService and DocumentService patterns).
Add and maintain integration tests and end-to-end tests for service boundaries and data correctness similar to the provided integration tests.
Harden authentication/operational security: replace hard-coded/logged credentials, add token revocation, and integrate secret management.

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

computer-shop-api document-service