Senior Backend Engineer 7+ years experience

GMT+1

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Senior Backend Engineer with 7+ years of experience building and operating high-load distributed systems. Delivered features end-to-end from requirements clarification to production release in Agile/Scrum teams of different sizes, both remote and on-site.

Contributed to scalable backend architecture, led monolith decomposition and service consolidation, improved backend performance in high-load environments, and optimized databases to maintain stability as systems scaled.

Also experienced in frontend development and .NET-based systems. Stay up to date with advancements in AI/ML and modern backend technologies. Enthusiastic about writing tech articles.

Node.js, TypeScript, JavaScript, NestJS, Fastify, Express.js
Prisma, TypeORM
PostgreSQL, Redis, MongoDB
Kafka, RabbitMQ
Docker, Kubernetes
AWS (EC2, S3, RDS, Lambda, SQS, SNS)
Microservices, Event-Driven Architecture
Distributed Systems, Highload Systems
REST, GraphQL, gRPC
System Design / Architecture

React, Redux, RTK Query, Next.js
WebSocket
Datadog, Grafana, Prometheus
JWT, OAuth2
OpenAI API
BullMQ
.NET, C#
CI/CD, GitLab CI/CD
MySQL, MSSQL, Cassandra
Nginx
Rate Limiting, Caching Strategies
Clean Architecture, DDD, CQRS
Outbox Pattern, Idempotency, Horizontal Scaling

11/2022 – Present, 3+ years

• Extracted transaction processing for in-game currency from the monolith into a dedicated microservice, reducing load on the core system by 34.7% and enabling independent horizontal scaling.
• Designed and implemented a customizable gamified loyalty widget backend, enabling rapid partner integrations and increasing conversion rates by 29.4% across 3 client integrations.
• Developed backend services for partner-integrated mini-games, increasing average user session duration by 11.8% and contributing to higher advertising revenue through improved ad engagement.
• Built scalable partner integration APIs enabling secure onboarding of 5k+ external users and supporting high-volume third-party integrations.

• Consolidated multiple AWS Lambda services into a unified containerized runtime, simplifying deployment workflows and reducing infrastructure costs by 9.6%.
• Refactored high-frequency Lambda handlers into shared backend modules, reducing redundant invocations by ~27% and improving execution efficiency under peak production load.
• Introduced centralized observability (metrics, logging, background job tracking) across distributed services, reducing mean time to detect incidents by ~21%.

Technologies:
Node.js (Fastify, NestJS), TypeScript, AWS (Lambda, EC2), Redis, Kafka, PostgreSQL, Docker

10/2020 - 11/2022, 2.1 years

• Optimized database performance for a high-load microservice by redesigning schema, introducing strategic indexing, optimizing raw and ORM queries, and implementing Redis-based caching, reducing response time from 33s to 25s and improving transaction throughput.
• Developed internal admin tooling that eliminated direct SQL access to production databases and reduced recurring developer support workload by ~5 requests per week.
• Increased automated test coverage to 93%, reducing customer-reported bugs by 7% and improving production stability.
• Modernized 11 Node.js microservices by containerizing and migrating from Windows to Linux, improving deployment stability and reducing infrastructure costs by 15%.

Technologies:
Node.js (NestJS, Express), PostgreSQL, MS SQL, Redis, RabbitMQ, Docker, .NET

02/2019 - 10/2020, 1.7 years

• Developed backend services for a real-time messaging platform using WebSocket and event-driven architecture, supporting scalable real-time message delivery.
• Migrated message storage from PostgreSQL to Cassandra, improving read/write performance for chat history and reducing message load times by ~24%.
• Designed and implemented a recommendation algorithm based on shared user interests, increasing friend connections by 63.7%.
• Automated recurring data collection via a custom scraping pipeline, saving ~2 hours of manual work daily.

Technologies:
Node.js, Express, WebSocket, PostgreSQL, Cassandra, Redis, Event-driven architecture, React

CHERKASY STATE TECHNOLOGICAL UNIVERSITY

Bachelor of Information and Computer Science
2017 - 2021

Master of Technical Project Coordination and Execution
2021 - 2023