Summary
5+ years of professional experience in backend engineering - Kotlin and Java with the Spring ecosystem.
Experience in domains such as cloud marketplaces, restaurant booking, invoicing & payments, and data extraction.
Experience in building backend services, BFF layers, API integrations, and business-process automation serving iOS/Android and web clients.
Acted as backend team lead - task coordination, sprint demos to stakeholders, and primary backend contact for cross-team requests.
Use AI coding agents (Claude Code, Cursor, Copilot, Codex) daily - faster delivery while owning architecture and code quality.
Skills
Programming LanguagesKotlin, Java, SQL
Frameworks & LibrariesSpring Boot, Spring Framework, Spring Security, Axon Framework, Kotlin Coroutines, Project Reactor, Hibernate
Databases & StoragePostgreSQL, MongoDB, Redis, BigQuery, OpenSearch
APIs & MessagingREST, gRPC, OpenAPI, Apache Kafka
Cloud & DevOpsAWS, GCP, Docker, Kubernetes, Terraform, CI/CD pipelines (GitHub Actions, Jenkins, ArgoCD)
Auth & SecurityAuth0, OpenFGA, OAuth2, JWT
TestingJUnit, Kotest, MockK, Mockito, TestContainers, PactFlow
ObservabilityHoneycomb, Grafana
Architecture & EngineeringMicroservices architecture, Event-driven architecture (CQRS/Event Sourcing), BFF pattern, SOLID principles
AI / Agentic CodingClaude Code, Cursor, GitHub Copilot, Codex
OtherLiquibase, Git, GitHub, GitLab, Jira, Confluence
Experience
Senior Backend Engineer
2025 - 2026Under NDA · Cloud Services Marketplace / Platform Engineering
- Designed and implemented a centralized roles & permissions management system, replacing a fragmented Terraform/CI pipeline with a unified solution - cross-environment visibility, audit trail, and self-service for admins
- Drove Spring 6 migration of the monolith - javax to jakarta namespaces, Spring 5.3 to 6.x / Security 6.x / Data 3.x upgrades across 15+ modules
- Contributed to the RBAC-to-FGA authorization migration - Auth0 resource-server provisioning across all environments, permissions back-sync, legacy cleanup
- Resolved critical production bugs in role management - missing permissions, broken propagation, and a platform-wide user-system permissions mismatch
- Provided cross-team platform support - code reviews and backend enablement for product teams
KotlinJavaSpring BootGradleAxon FrameworkMongoDBOpenFGAAuth0TerraformKafkaAWSDockerKubernetesHoneycombArgoCDGitHub Actions
Senior Backend Engineer
2023 - 2025Under NDA · Cloud Services Marketplace / Mobile BFF
- Owned the BFF layer end-to-end - 40+ endpoints, 8+ downstream microservices, serving iOS & Android clients
- Reduced API response latency by ~40% through parallel execution of downstream service calls
- Introduced consumer-driven contract testing (PactFlow) across BFF, mobile clients, and microservices - full endpoint coverage, preventing breaking changes from reaching production
- Architected and documented the API versioning strategy, enabling backward-compatible biweekly releases
- Led the Java 17 to 21 migration and the OAuth2 resource-server auth migration
- Integrated YouTube as an external content provider into the mobile platform
KotlinJavaSpring BootRESTOpenAPIOpenSearchPactFlowHoneycombDockerKubernetesArgoCDGitHub Actions
Backend Engineer
2022 - 2023Quandoo · Global Restaurant Booking Platform
- Reduced manual accounting workload by 70% within the first year by automating the end-to-end invoicing pipeline - generation, delivery, payment reminders, and order-payment reconciliation
- Migrated a legacy invoicing system (10+ Python scripts & Excel) into a production-grade Kotlin microservice processing thousands of invoices monthly across 17,000+ restaurant partners in 12 countries
- Integrated Salesforce CRM via REST API, replacing scattered automation scripts with reliable service-to-service data sync
- Implemented async processing with Kotlin Coroutines for high-volume reconciliation and reporting workloads
- Built financial reporting modules on BigQuery, replacing manual Excel workflows
KotlinJavaSpring BootKotlin CoroutinesPostgreSQLBigQueryRedisSalesforceDockerGCPKubernetesJenkins
Backend Engineer
2020 - 2021DataOx · Outsourcing / Data Extraction & Automation
- Delivered 3 production projects end-to-end - from architecture to AWS deployment
- Developed a hybrid web scraping engine (Selenium + Jsoup) for large-scale business-data extraction across 50+ target sources
- Built an automated news aggregation pipeline - 8+ sources, scheduled collection, PDF & Google Sheets export
- Designed an event-driven Discord automation service with configurable moderation rules and persistent audit logging
JavaSpring BootLiquibasePostgreSQLMavenSeleniumJsoupDockerAWS (EC2, RDS)Bitbucket Pipelines
Education
Bachelor's degree in Computer Science & Telecommunications
National University "Kyiv Aviation Institute" (Kyiv, Ukraine)
Languages
English - Upper-intermediate (B2)Ukrainian - Native