A telecommunication provider with $300 million annual revenue.Achievements:• Developed customer support platform using frameworks FastAPI and Django.• Collaborated in the migration of microservice infrastructure to AWS, resulting in a 30% reduction in server costs.• Significantly improved test coverage, from 10 to 90%, by writing comprehensive unit tests, integration tests, and end-to-endtests using Pytest.• Analyzed system performance to identify areas of improvement, resulting in a 25% reduction in response time during highloads; implemented targeted optimizations to enhance overall system performance.• Arranged reliable key integrations with other systems using Python and PostgreSQL focusing on fault tolerance throughmechanisms such as retries, circuit breakers, and error-handling strategies to ensure system stability and resilience.

An e-commerce startup with 27,000 active sellers.Achievements: • Developed an e-commerce scalable B2B platform with Python, integrated with ETL processes using Python and RabbitMQ for data processing and integrations between sellers and marketplaces.• Engineered the migration of product to microservice architecture using AsyncIO, implementing gRPC for efficient service-to-service communication; optimized service scalability, resulting in 40% decrease in response times and 25% increase in system uptime• Integrated third-party APIs for payment processing and authentication, enhancing the functionality and security of the web application, leading to a customer satisfaction and retention.• Designed comprehensive monitoring and alerting solutions using ELK and Grafana allowing effective action on production issues, resulting in a 70% reduction in resolution time.• Provided mentorship to a team of developers, conducting regular code reviews, pair programming sessions, and knowledge-sharing sessions, resulting in a increase in code quality and a reduction in bug density.

An online platform for ticket sales for events.Achievements:• Launched an e-ticket sales system with integrations with external systems, and microservices on Django Rest Framework and Flask.• Successfully refactored critical components of the product, resulting in increased system performance, a significant reduction in disk utilization, and a 3-time decrease in storage costs.• Led the organization and implementation of comprehensive code standards within the team.• Optimized database queries and schema design to improve query performance and reduce response times, resulting in a 50%decrease in average query execution time.

A leading media outlet with 60+ million views per month.Achievements:• Designed the online version of the magazine of a big media outlet, which increased total monthly revenue by 15%.• Achieved a remarkable 30% improvement in page load times, enhancing user engagement and satisfaction with faster accessto content.• Implemented efficient caching mechanisms, resulting in a notable 60% reduction in database hits and significantly improvingsystem responsiveness, ensuring smooth performance under high traffic conditions.• Successfully introduced Python and Django framework into the company’s technology stack, modernizing developmentpractices and enabling faster, more scalable web application development.