Yuriy N.

Yuriy N.

Backend Developer

Poland
Trusted member since 2025
12 years of experience

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

GolangGolang8 years
GitGit12 years
SQLSQL10 years
RedisRedis10 years
22+

Experience4

Flipp

Golang Developer

Flipp
Marketing and Advertising
Jul 2020 - Sep 2025 · 5y 2m
  • 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.
JavaScriptJavaScript
MongoDBMongoDB
DockerDocker
PostgreSQLPostgreSQL
AWSAWS
11+
Xendit

Golang Developer

Xendit
Financial Technology (FinTech)
Feb 2019 - Jul 2020 · 1y 5m
  • 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.
MongoDBMongoDB
DockerDocker
PostgreSQLPostgreSQL
AWSAWS
GolangGolang
8+
Amadeus

PHP Developer

Amadeus
Travel and Tourism
Oct 2017 - Feb 2019 · 1y 4m
  • 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.
PHPPHP
SymfonySymfony
MySQLMySQL
MongoDBMongoDB
DockerDocker
17+
Ciklum

PHP Developer

Ciklum
Marketing and Advertising
Feb 2016 - Jul 2017 · 1y 5m
  • 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.
PHPPHP
YiiYii
SymfonySymfony
MySQLMySQL
JavaScriptJavaScript
6+

Assessments

Engineering excellence

Yuriy’s overall performance in a 90-minute live technical assessment ranks in the top 50% of vetted Backend Developers at Proxify.

Certificates 5

Essential Google Cloud Infrastructure: FoundationCoursera Inc.

Issued Nov 2021

Google CloudGoogle Cloud
Infrastructure and Application Modernization with Google CloudCoursera Inc.

Issued Nov 2021

Google CloudGoogle Cloud
Essential Google Cloud Infrastructure: FoundationCoursera Inc.

Issued Nov 2021

Google CloudGoogle Cloud
Do you want to know more about Yuriy’s certifications?Book a call

Education

Donetsk National Technical University
Donetsk National Technical University
Computer science2007 - 2012

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