• Developed and managed a scalable and cost-efficient backend system using microservices architecture and RabbitMQ under tight budgets and deadlines. Balanced key trade-offs between hosting costs, user experience, maintainability, tech debt and dev capacity to maintain high performance and low latency.• Achieved 99.9% system stability, in a solution used by millions of users, practically eliminating downtime due to robust error handling and redundancy.• Developed an ApiGateway for efficient request forwarding to microservices via RabbitMQ.• Implemented a blue-green deployment strategy for seamless, risk-minimized releases and easy rollback.• Used Datadog for system logging and monitoring, and created dashboards for easy visualization of performance metrics.• Allowed each pull-request to be separately deployed and tested in an isolated environment, reducing integration issues, by utilizing AWS ECS with Fargate for deploying all services as a monolith.• Enforced stringent code reviews and architectural evaluations, maintaining high code and architecture quality.• Mentored fellow developers, guiding their skill improvement and ensuring their code aligns with best practice standards.• Created practical tools to increase team productivity and work effectiveness.• Contributed to company-wide decisions that shaped the future of our products.• Implemented TeamCity for CI/CD with over 20 build configurations. Leveraged complex PowerShell build scripts to automate building PRs and creating fixes, obfuscation and code signing.• Developed robust internal tools to manage accounts and permissions of all employees within the company, bolstering security and ensuring precise access control, thereby enhancing operational efficiency and data safety.• Leveraged Fastly not just as a CDN, but also as a first line of defense, verifying all incoming requests. This ensured invalid requests were blocked right at the edge, enhancing system security and reducing unnecessary load.

Led the migration of our flagship product, ggLeap, from Unity to WebView2, significantly enhancing its functionality and user experience.Contributed to the development of a new diskless boot solution, ggRock, capable of booting more than 100 client machines from a single server, optimizing hardware usage and operational efficiency.Implemented hundreds of new features including:• Payment and subscription mechanisms utilizing Stripe, Square, and Paypal.• Single Sign-On (SSO) integrations with Google, Facebook, Apple, and SAML.• Google Recaptcha on all login pages to enhance security.• Rate limits on all authentication-related endpoints, as well as other high-traffic endpoints to ensure system stability.• Job scheduling system for efficient task management.• Swagger and a differential checker, enabling easy creation of a changelog between two backend versions and automatic detection of backwards incompatibilities.• Migrated projects from .NET Framework to .NET5 and enabled C# 8 nullable types.• Introduced Redis into the project.• Online installer with full customizability, generated dynamically as needed.• Integrated various hardware devices, including LED strips, RFID readers, receipt printers, PS5 and Xbox.

Began my career as a Full Stack .NET Developer on Upwork, delivering over 40 small projects with high-quality results, garnering exceptional reviews on each for my technical skills and commitment to project success.