Myron Shykhov

Senior Backend Engineer

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Summary

5+ years of professional experience in backend engineering - Kotlin and Java with the Spring ecosystem.

Experience across fintech, subscription billing, 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, TypeScript, SQL
Frameworks & LibrariesSpring Boot, Spring Framework, Spring Security, Kotlin Coroutines, Axon Framework, Project Reactor, Hibernate (JPA), Node.js, Backstage
Databases & StoragePostgreSQL, MongoDB, Redis, BigQuery, OpenSearch, SQLDelight
APIs & MessagingREST, GraphQL, 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
Observability & ExperimentationDatadog, Honeycomb, Grafana, GrowthBook (feature flags, A/B testing)
Architecture & EngineeringMicroservices architecture, Event-driven architecture (CQRS/Event Sourcing), BFF pattern, SOLID principles
OtherFlyway, Liquibase, AI Coding Agents, Claude Code skills, MCP

Experience

Senior Backend Engineer

2026

Lendable · FinTech / Subscription Billing & Payments

  • Delivered a first-month-free Premium promotion end-to-end for customers making their first card transaction within 7 days of card opening - event processing, idempotent grants, GrowthBook A/B testing, checkout, billing and production monitoring
  • Resolved a production subscription-billing incident with the team, correcting renewal logic and supporting refunds for customers charged incorrectly
  • Helped bootstrap and build a standalone Wallet microservice from scratch - architecture, development, setup and GitOps rollout with DevOps, Memberships integration and production payment-data migration
  • Mentored backend engineers through onboarding, technical design and code reviews
  • Created reusable Claude Code skills and MCP workflows for development and code review
KotlinSpring BootPostgreSQLKafkaGraphQLAWSKubernetesTerraformTestcontainers

Senior Backend Engineer

2025 - 2026

Under 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 a Backstage self-service admin portal (Node.js/TypeScript)
  • Drove a 15+ module migration to Spring 6, Spring Security 6, and Spring Data 3, including javax-to-jakarta namespace changes
  • Contributed to the migration from role-based to fine-grained authorization - provisioned Auth0 resource servers across all environments, synchronized permissions and removed legacy authorization components
  • 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
KotlinJavaTypeScriptSpring BootNode.jsKafkaAWSKubernetesTerraformOpenFGA

Senior Backend Engineer

2023 - 2025

Under 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, covering all BFF endpoints to detect breaking API changes before release
  • 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 BootRESTOpenAPIKubernetesJUnitPactFlow

Backend Engineer

2022 - 2023

Quandoo · Restaurant Technology / Booking & Payments

  • 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 BootPostgreSQLRedisGCPKubernetesBigQuery

Backend Engineer

2020 - 2021

DataOx · 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 BootPostgreSQLAWSDockerLiquibase