Yuriy N.

Backend Developer

Yurii is a Backend Developer with over 11 years of commercial experience, specializing in concurrency, performance optimization, and microservices architectures using RESTful APIs and gRPC.

He has extensive expertise in databases, cloud platforms, containerization, and message queues, building scalable and reliable systems monitored with tools like DataDog.

He played a key role in developing a high-load Ads system for the web, implementing performance optimizations that reduced infrastructure costs by 20–30%, integrating monitoring and code quality tools such as DataDog and SonarQube, and improving overall system stability.

In addition to his technical contributions, Yurii mentored junior developers, led knowledge-sharing sessions, and supported the growth and development of engineering teams.

Main expertise

  • Golang
    Golang 8 years
  • Git
    Git 12 years
  • SQL
    SQL 10 years

Other skills

  • Docker
    Docker 5 years
  • Kubernetes
    Kubernetes 4 years
  • AWS
    AWS 3 years
Yuriy

Yuriy N.

Poland

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Selected experience

Employment

  • Golang Developer

    Flipp - 5 years 2 months

    • Contributed to the development and scaling of a real-time ad bidding platform built on a modern microservices architecture as part of a high-performing team.
    • Developed and maintained backend services in Golang, exposing both RESTful APIs and gRPC for high-performance communication.
    • Deployed services on AWS EKS to ensure scalability, resilience, and efficient resource utilization.
    • Leveraged Redis for caching and optimizing data access in latency-sensitive components.
    • Integrated third-party platforms such as Kevel for ad serving and LaunchDarkly for feature flag management to enhance system flexibility and control.
    • Led initiatives to improve system stability, increase observability, and optimize resource consumption by 20%, delivering performance and cost benefits.
    • Maintained high code quality through active participation in code reviews and adherence to best practices.
    • Took ownership of major features, drove development initiatives within the domain stream, and mentored junior developers while supporting onboarding of new team members.

    Technologies:

    • Technologies:
    • JavaScript JavaScript
    • MongoDB MongoDB
    • Docker Docker
    • PostgreSQL PostgreSQL
    • AWS AWS
    • ElasticSearch ElasticSearch
    • Redis Redis
    • Golang Golang
    • Apache Kafka Apache Kafka
    • AWS S3 AWS S3
    • Terraform Terraform
    • BigQuery BigQuery
    • DDD
    • DataDog DataDog
    • SonarQube SonarQube
    • GitHub Actions GitHub Actions

  • Golang Developer

    Xendit - 1 year 5 months

    • Contributed to the design and development of a real-time fraud detection system on a microservices architecture, collaborating with data analysts and engineers to deliver scalable services that supported fraud alerting and case investigations.
    • Developed and maintained backend services in Golang, exposing APIs for both real-time and batch fraud analysis workflows.
    • Worked with MongoDB and PostgreSQL to manage structured and semi-structured fraud case data.
    • Implemented an event-driven architecture with Kafka and NATS to enable asynchronous communication between microservices.
    • Deployed services on Kubernetes to ensure scalability, resilience, and optimal resource usage.
    • Partnered with data teams using Databricks to analyze transaction data, detect fraud patterns, and implement automated alerting mechanisms.
    • Participated in architectural discussions to shape new fraud detection features and maintained high code quality through code reviews and adherence to best practices.

    Technologies:

    • Technologies:
    • MongoDB MongoDB
    • Docker Docker
    • PostgreSQL PostgreSQL
    • AWS AWS
    • Golang Golang
    • Databricks Databricks
    • Apache Kafka Apache Kafka
    • Google Cloud Google Cloud
    • Terraform Terraform
    • DDD
    • SonarQube SonarQube
    • Argo CD Argo CD
    • GitHub Actions GitHub Actions

  • PHP Developer

    Amadeus - 1 year 4 months

    • Built and maintained internal tools and client-facing APIs using Symfony (PHP) and Golang, focusing on performance, integrations, and efficient data handling.
    • Developed backend features with Symfony for core platform functionality and implemented a Golang-based microservice to manage multiple third-party API calls and response mapping.
    • Designed and implemented a hierarchical admin system for clients, groups, and offices in MongoDB, leveraging the lookup operator to merge parent data and construct tree structures.
    • Improved MongoDB query performance through strategic indexing.
    • Integrated third-party provider APIs and developed custom REST APIs for external clients, employing JMS Serializer to convert JSON into domain entities.
    • Enhanced caching and system performance using Memcache and Redis to reduce load on primary data sources.
    • Maintained code quality by writing unit tests with PHPUnit and participating in code reviews.
    • Contributed to frontend rendering with Mustache templates within Twig, enabling dynamic updates via Ajax.
    • Took ownership of delivering large features and epics to production, ensuring smooth deployments and ongoing support.

    Technologies:

    • Technologies:
    • PHP PHP
    • Symfony Symfony
    • MySQL MySQL
    • MongoDB MongoDB
    • Docker Docker
    • ElasticSearch ElasticSearch
    • Redis Redis
    • Golang Golang
    • Apache Kafka Apache Kafka
    • SQL SQL
    • BigQuery BigQuery
    • DDD
    • Git Git
    • OAuth2 OAuth2
    • JSON JSON
    • Soap
    • MVC MVC
    • REST API REST API
    • Swagger Swagger
    • SonarQube SonarQube
    • NoSQL
    • YAML YAML

  • PHP Developer

    Ciklum - 1 year 5 months

    • Developed the backend for a mobile-focused dating application, implementing a REST API and using ElasticSearch as the core geo-search engine for location-based discovery.
    • Integrated AWS SQS to handle asynchronous tasks such as uploading user images and videos to S3 and updating user indexes in ElasticSearch.
    • Achieved 86% unit test coverage using the Kahlan testing framework.
    • Implemented real-time messaging functionality by integrating the QuickBlox API.
    • Designed services based on microservices architecture and Onion Architecture principles, emphasizing Domain-Driven Design.
    • Leveraged Redis with pipelining and hash tables to ensure fast and efficient key-value data retrieval.
    • Employed a Canary deployment strategy to safely roll out new features in production environments.
    • Conducted code reviews and wrote comprehensive technical documentation for the REST API.

    Technologies:

    • Technologies:
    • PHP PHP
    • Yii Yii
    • Symfony Symfony
    • MySQL MySQL
    • JavaScript JavaScript
    • MariaDB MariaDB
    • AWS AWS
    • ElasticSearch ElasticSearch
    • Redis Redis
    • NGINX NGINX
    • REST API REST API

Education

  • BSc.Computer science

    Donetsk National Technical University · 2007 - 2012

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