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Dmitriy Tolkunov

@dmitriytolkunov

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Senior backend engineer building high-load microservices and event-driven data pipelines.

Ukraine

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What I'm looking for

I’m looking to own backend architecture for high-load microservices and event-driven systems—delivering scalable data pipelines, production observability, and strong mentoring through code reviews and technical direction.

I’m a senior backend engineer with 6+ years of experience designing and building distributed systems for international clients across fintech, crypto, and e-commerce. I focus on high-load microservices, event-driven architectures, and real-time data pipelines, with production observability and full-stack ownership from architecture decisions to release.

Recently, I reworked a production migration of 30M+ records by redesigning batching and commit granularity, cutting runtime to ~30 minutes with zero throughput degradation. I also refactored core event flows to reduce emitted events by 50%, built and shipped new microservices into live distributed systems with end-to-end Testcontainers tests, and mentor engineers through KT sessions and code reviews.

Experience

Work history, roles, and key accomplishments

Current

CheeTrader

Current

CheeTrader

Jan 2025 - Present (1 year 6 months)

Designed and built a distributed Kotlin/Spring Boot backend for a crypto trading platform with microservices communicating over Kafka and gRPC. Built Desktop and Android clients from a shared Kotlin Multiplatform/Compose Multiplatform codebase and integrated multiple exchanges via REST and WebSocket for real-time order-book processing and signal generation.

Kotlin Spring Boot Kotlin Multiplatform Compose Multiplatform Microservices Kafka gRPC PostgreSQL Docker Prometheus Grafana GitHub Actions REST APIs WebSockets Strategy Engine

Software Engineer (Java / Kotlin)

SPD Technology

Oct 2021 - May 2026 (4 years 7 months)

Reworked an underperforming production migration of 30M+ records by redesigning batching/commit granularity, cutting runtime to ~30 minutes without throughput degradation. Built and shipped microservices in a live distributed system, including cascading event flows validated with end-to-end Testcontainers tests, and owned the feature lifecycle from HLD to production.

Kotlin Java Spring Boot Spring Data Hibernate Junit Test Containers gRPC Microservices Event Driven Architecture PostgreSQL MongoDB Docker Kubernetes OpenShift Jenkins React TypeScript

Backend Developer

Contract & Consulting

Dec 2019 - Oct 2021 (1 year 10 months)

Delivered backend systems end-to-end as the sole technical contributor, scoping requirements, designing solutions, and shipping to production across async remote teams. Built CRM and user-management services from scratch (data models, business logic, REST APIs, authentication, and third-party integrations) and set up monitoring/alerting for production systems.