Роман

Roman Soproniuk
Java Software Engineer
Lutsk, Ukraine · Remote [open contact info](look above in the "contact info" section) [open contact info](look above in the "contact info" section)

[open contact info](look above in the "contact info" section) github.com/sopronyr t.me/romansoproniuk

CORE SKILLS Java engineer with 4+ years of commercial experience building low-latency, high-
LANGUAGES & CORE
throughput backend systems for fintech and high-load OTT platforms. Strongest in
Java (8 - 25), performance tuning, Spring Boot microservices, and modernizing legacy JVM codebases.
Multithreading, Project Also an author of the Speedbump, a published IntelliJ plugin for Java performance analysis.
Reactor Comfortable owning a request path end to end, from edge to storage.
FRAMEWORKS PROJECT plugins.jetbrains.com/plugin/33366-speedbump
Spring (Boot, MVC,
Security, Data, WebFlux), Speedbump - IntelliJ IDEA plugin, JetBrains Marketplace
Hibernate, Quarkus, Detects Java performance anti-patterns by static analysis, walking the code’s PSI tree and
Micronaut highlighting issues directly in the editor - no build or run required.
MESSAGING & APIS
EXPERIENCE
Kafka, RabbitMQ, REST,
GraphQL, gRPC/Feign, Java Software Engineer Jun 2025 – Present
Schema Registry 1+1 Media (Kyivstar TV) Kyiv / Remote
DATA Cut p99 latency below 200 ms at 2k RPS (p95 < 100 ms, avg < 50 ms), holding sub-250 ms
PostgreSQL, MongoDB, p99 through prime-time peaks.
Oracle, Redis Prepared the platform for peak-load events at million-scale concurrent users and tens of
CLOUD & DEVOPS thousands of RPS - capacity planning, load testing, and bottleneck removal.
AWS (EC2, S3, CloudFront, Drove modernization of a Java/Spring codebase: JDK and dependency upgrades, plus
SQS, SNS), Docker, Jenkins, migration of the Redis and MongoDB storage layers.
GitLab CI, Liquibase, Maven Optimized the full request path end to end - from the CloudFront edge through ALB and
Tomcat to the client response.
OBSERVABILITY
Datadog, OpenTelemetry, Used Datadog and Elasticsearch/Kibana to profile services, trace regressions, and validate
ELK / Kibana, Grafana, performance gains.
Prometheus Introduced agentic AI coding into the engineering workflow, authoring internal
tools that automate service health checks, error and profiling reports, and ticket-to-
TESTING implementation flows.
JUnit 4/5, Mockito, Stack Java (8 - 25) · Spring Boot (Data, Web, WebFlux) · Project Reactor · MongoDB
JMeter, SLF4J / Logback · Redis · AWS (CloudFront, ALB) · Tomcat · Datadog · Elasticsearch / Kibana
· Docker
PERFORMANCE
TOOLS
Async-profiler, JDK Flight Java Developer May 2023 – May 2025

Recorder (JFR) + JDK PUMB (First Ukrainian International Bank) Remote

Mission Control, VisualVM Built and enhanced backend services for installment payments, installment-based lending, and
transaction-based installments.
Architected and shipped scalable solutions for complex financial workflows; refactored and
EDUCATION optimized mobile-facing backend modules.
Mate Academy Instrumented services with OpenTelemetry for distributed tracing and telemetry.
Java Software Engineer Stack Java 11/17/21 · Spring Boot (Data, Web, WebFlux) · Hibernate · Oracle ·
program PostgreSQL · MongoDB · Redis · Kafka · RabbitMQ · GraphQL · Keycloak · Corezoid ·
2022 – 2023 Docker · JUnit · Mockito

Java Developer (Freelance) May 2022 – Apr 2023

Financial & trust-fund services Remote
LANGUAGES
Developed and optimized backend web applications for a firm managing client trust funds.
Ukrainian Native Built and maintained RESTful APIs for integration with internal systems; used Spring Boot
English Upper-Int. for microservices.
German Beginner Tuned SQL queries and database configuration for fast processing of large data volumes;
added JUnit/Mockito test coverage for stability.
Stack Spring MVC · Spring Security · Spring Data · Hibernate · PostgreSQL · Docker
· Liquibase · Swagger · Postman