Olga V.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

Senior Java Backend Engineer with 10+ years of experience designing and delivering distributed microservices and integration platforms. Strong background in asynchronous processing, messaging systems, API gateways / proxy services, and data pipelines. Extensive experience working with third-party API integrations. Proven track record in building reliable, scalable services with advanced retry, rate-limiting, queueing and validation mechanisms, and in supporting complex upgrade and migration workflows. Skills and Technologies Languages Java (11 / 17 / 21) TypeScript, Python, Kotlin Frameworks & Platforms Spring Boot (3.x), Spring MVC, Spring Security, Spring Data Microservice architecture Messaging & Asynchronous Processing Redis RabbitMQ AWS Kinesis AWS IoT PostgreSQL-based internal queues Scheduled and background job processing Cloud AWS (EC2, S3, Lambda, EventBridge, Batch) Docker (multi-stage builds) Jenkins, Bitbucket Pipelines, CircleCI Databases & Storage PostgreSQL MySQL MS SQL Server Cassandra APIs & Integrations REST, SOAP OAuth 2.0 (Salesforce Connected Apps, external APIs) Salesforce APIs (SOAP / WSC) Third-party APIs (Sendbird, Google Maps, Mapbox, OSRM, Naurt, DoorDash, Uber Direct, Google Drive, Azure Files, AWS S3) SFTP Testing & Quality JUnit, Mockito, Testcontainers SonarQube Build & Tooling Maven, Gradle Git IntelliJ IDEA, Cursor Jira Flyway SpringDoc OpenAPI Observability & Reliability Micrometer, Prometheus Spring Boot Actuator Structured logging and metrics Retry, rate-limiting and fault-tolerance patterns Web Automation / Scraping Selenium jsoup